BMW S58 Owner's Handbook Manual
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BMW S58 Owner's Handbook Manual

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Technical￿training.
Product￿information.
S58￿Engine
BMW￿Service

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  • Page 1 Technical￿training. Product￿information. S58￿Engine BMW￿Service...
  • Page 2 General￿information Symbols￿used The￿following￿symbol￿is￿used￿in￿this￿document￿to￿facilitate￿better￿comprehension￿or￿to￿draw￿attention to￿very￿important￿information: Contains￿important￿safety￿information￿and￿information￿that￿needs￿to￿be￿observed￿strictly￿in￿order￿to guarantee￿the￿smooth￿operation￿of￿the￿system. Information￿status:￿February￿2019 BMW￿Group￿vehicles￿meet￿the￿requirements￿of￿the￿highest￿safety￿and￿quality￿standards.￿Changes in￿requirements￿for￿environmental￿protection,￿customer￿benefits￿and￿design￿render￿necessary continuous￿development￿of￿systems￿and￿components.￿Consequently,￿there￿may￿be￿discrepancies between￿the￿contents￿of￿this￿document￿and￿the￿vehicles￿available￿in￿the￿training￿course. The￿information￿contained￿in￿the￿training￿course￿materials￿is￿solely￿intended￿for￿participants￿in￿this training￿course￿conducted￿by￿BMW￿Group￿Technical￿Training￿Centers,￿or￿BMW￿Group￿Contract Training￿Facilities. This￿training￿manual￿or￿any￿attached￿publication￿is￿not￿intended￿to￿be￿a￿complete￿and￿all￿inclusive source￿for￿repair￿and￿maintenance￿data.￿It￿is￿only￿part￿of￿a￿training￿information￿system￿designed￿to assure￿that￿uniform￿procedures￿and￿information￿are￿presented￿to￿all￿participants. For￿changes/additions￿to￿the￿technical￿data,￿repair￿procedures,￿please￿refer￿to￿the￿current￿information issued￿by￿BMW￿of￿North￿America,￿LLC,￿Technical￿Service￿Department. This￿information￿is￿available￿by￿accessing￿TIS￿at￿www.dealerspeed.net. Additional￿sources￿of￿information Further￿information￿on￿the￿individual￿topics￿can￿be￿found￿in￿the￿following: • Owner's￿Handbook • Integrated￿Service￿Technical￿Application • Aftersales￿Information￿Research￿(AIR) The￿information￿contained￿in￿this￿manual￿is￿not￿to￿be￿resold,￿bartered,￿copied,￿or￿transferred without￿the￿express￿written￿consent￿of￿BMW￿of￿North￿America,￿LLC￿(“BMW￿NA”). ©2019￿BMW￿of￿North￿America,￿LLC The￿BMW￿name￿and￿logo￿are￿registered￿trademarks.￿All￿rights￿reserved.

  • Page 3: Table Of Contents

    S58￿Engine Contents Introduction ................................................1.1. Highlights ............................................1.1.1. Technical￿data .................................... 1.1.2. Full￿load￿diagram ................................... 1.2. B58/S58￿new￿features/changes ..............................1.2.1. Overview ......................................1.2.2. Comparison￿of￿S58￿engine￿and￿B58TU￿engine ..............Engine￿History ............................................... 2.1. Variants￿of￿the￿BMW￿6-cylinder￿M￿engines ......................Engine￿Identification ......................................... 3.1. Engine￿designation￿and￿engine￿identification ...................... 3.1.1. Engine￿designation ............................... Engine￿Mechanical ..........................................4.1. Engine￿housing ........................................
  • Page 4 S58￿Engine Contents Oil￿ Supply ................................................7.1. Differences￿in￿the￿oil￿supply ................................7.2. Oil￿supply￿adaptations ....................................7.3. Oil￿pump ............................................7.3.1. Maximum￿delivery ................................7.3.2. Minimum￿delivery ................................7.3.3. Second-level￿control￿(emergency￿operation) ............... 7.4. Map￿control￿valve ......................................7.5. Oil￿supply￿during￿high￿acceleration ............................7.6. Oil￿spray￿nozzles ......................................... 7.7. Centrally￿controllable￿piston￿cooling￿via￿oil￿spray￿nozzles ..............7.7.1. Relay￿valve￿control￿valve ............................7.8. Oil￿filter￿and￿engine￿oil￿cooling ..............................
  • Page 5 S58￿Engine Contents 10. Fuel￿Preparation ............................................10.1. Overview ............................................10.2. Low-pressure￿fuel￿system ................................... 10.3. High-pressure￿fuel￿system ................................. 11. Cooling￿System ............................................11.1. Overview ............................................11.2. Engine￿cooling ........................................11.2.1. Cooling￿circuit,￿exhaust￿turbocharger ..................... 11.2.2. Charge￿air￿cooling ................................12. Engine￿Electrical￿System ......................................12.1. Engine￿control￿unit ......................................12.1.1. DME￿control￿unit ................................12.1.2. Overall￿function...

  • Page 7: Introduction

    S58￿Engine 1.￿Introduction 1.1.￿Highlights The￿S58￿engine￿is￿the￿successor￿to￿the￿S55￿engine.￿Like￿the￿S55￿engine￿in￿the￿BMW￿M4￿and￿BMW M2￿Competition,￿the￿S58￿engine￿is￿based￿on￿a￿BMW￿AG￿standard￿production￿engine.￿The￿S58￿engine is￿based￿on￿the￿B58TU￿engine,￿as￿the￿engine￿identification￿highlights. Technical￿updates￿and￿modifications￿of￿M￿GmbH￿make￿the￿engine￿suitable￿for￿motor￿racing. With￿its￿turbocharged,￿high-revving￿design,￿the￿new￿M￿engine￿delivers￿impressive￿and￿undreamt-of power￿development￿with￿a￿nominal￿output￿of￿353 kW/480 hp￿compared￿with￿the￿317 kW/431 hp￿of its￿predecessor.￿The￿maximum￿torque,￿an￿indicator￿of￿the￿power￿delivery￿and￿performance￿perceived by￿the￿driver,￿has￿risen￿from￿550 Nm￿to￿600 Nm.￿This￿has￿been￿achieved￿despite￿the￿fact￿that￿fuel consumption￿and￿CO ￿emissions￿have￿been￿reduced￿with￿the￿aid￿of￿the￿BMW￿EfficientDynamics measures. As￿the￿S58￿engine￿is￿based￿on￿the￿B58TU￿engine,￿it￿has￿been￿possible￿to￿carry￿over￿a￿number￿of engine￿components￿from￿the￿B58TU￿standard￿production￿engine.￿The￿other￿90%￿of￿the￿engine components￿are￿new￿developments￿or￿synergy￿parts￿with￿the￿B58TU￿engine.￿All￿the￿technical￿data￿is above￿that￿of￿the￿predecessor.
  • Page 8 S58￿Engine 1.￿Introduction 1.1.1.￿Technical￿data S58￿engine,￿overall￿view Model Unit F80/F82*** F97/F98 Engine S55B30T0 S58B30T0 Design Displacement [cc] 2979 2993 Bore￿hole/Stroke [mm] 84.0/89.6 84.0/90.0 Power [kW/hp] 317/425 353/473 at￿engine￿speed [rpm] 5550-7300 6250 375/503**** 6250****...
  • Page 9 S58￿Engine 1.￿Introduction Model Unit F80/F82*** F97/F98 Power￿output￿per￿liter [kW/l] 106.4 117,9 125.3**** Torque [Nm/lb-ft] 550/406 600/442 at￿speed [rpm] 1850-5500 2600-5600 2600-5950**** Compression￿ratio [ε] 10.2￿:￿1 9.3￿:￿1 Oil￿quantity Digital￿Motor￿Electronics MEVD17.2.G DME￿8.6.S Exhaust￿emissions￿legislation ULEV￿70 ULEV￿70 Acceleration￿0-100 km/h 4.1*** 4.1**** *￿Electronically￿limited. **￿With￿M￿Driver's￿Package￿(SA￿7ME). ***￿With￿M￿double-clutch￿transmission￿with￿Drivelogic￿. ****￿With￿Competition￿package￿(SA￿7MN/7MA).
  • Page 10 S58￿Engine 1.￿Introduction 1.1.2.￿Full￿load￿diagram In￿comparison￿with￿the￿predecessor,￿the￿S58￿engine￿features￿lower￿fuel￿consumption￿with￿higher power￿and￿torque￿data. Full￿load￿diagram￿for￿F82￿with￿S55￿engine￿compared￿with￿F97/F98￿with￿S58￿engine...
  • Page 11 S58￿Engine 1.￿Introduction 1.2.￿B58/S58￿new￿features/changes 1.2.1.￿Overview S58￿engine,￿exploded￿diagram Index Explanation Cylinder￿head￿cover Cylinder￿head Cylinder￿head￿gasket Crankcase...
  • Page 12 S58￿Engine 1.￿Introduction Index Explanation Crankshaft￿drive Sump￿gasket Oil￿supply Oil￿sump 1.2.2.￿Comparison￿of￿S58￿engine￿and￿B58TU￿engine Engine￿mechanics Component Comment Same Cylinder￿head￿cover Adapted￿to￿two￿high￿pressure￿pumps  Adapted￿crankcase￿ventilation Cylinder￿head Mounting￿for￿the￿two￿high￿pressure pumps  B58￿split-cooling￿concept￿discontinued Water￿chamber￿cross-sections￿enlarged Crankcase￿ventilation￿gas￿ducting Cylinder￿head Revised￿cylinder￿head￿gasket￿due￿to gasket  higher￿combustion￿pressure￿of￿S58 engine Crankcase Adapted￿for￿bi-turbo No￿attachment￿for￿heat￿management module  Additional￿oil￿ducts￿for￿switchable￿piston cooling Additional￿oil￿ducts Crankshaft￿with Stroke￿increased￿to￿90 mm bearings ...
  • Page 13 S58￿Engine 1.￿Introduction Component Comment Same Piston￿and￿wrist￿pin Adaptation￿of￿the￿piston￿and￿wrist￿pin￿to high-speed￿concept  Coated￿wrist￿pin￿Diamond-Like￿Carbon (DLC) Chain￿drive Concept￿carried￿over￿from￿B58TU engine  Timing￿chain￿adapted￿to￿S58￿engine Guide￿rail￿adapted￿to￿the￿S58￿engine 1￿ New￿design ￿Identical￿concept Valve￿gear Component Comment Same Camshafts Exhaust￿camshaft￿with￿twin￿triple￿cams￿for￿the  driving￿the￿high￿pressure￿pumps. Intake￿valves  Material￿change VANOS Adjusters￿shorter￿and￿more￿compact￿design  Modified￿camshaft￿sprockets￿due￿to￿adapted timing￿chain Fully￿variable￿valve￿lift Optimization￿of￿work￿curve￿for￿the￿valve adjustment ...
  • Page 14 S58￿Engine 1.￿Introduction Oil￿supply Component Comment Same Oil￿supply Additional￿oil￿sump￿lid Oil￿pump￿designed￿as￿spur-gear￿pump  Additional￿oil￿return￿pumps Additional￿oil￿extraction,￿exhaust￿turbocharger Centrally￿switchable￿piston￿cooling New￿design Identical￿concept Air￿intake￿and￿exhaust￿emission￿system Component Comment Same Exhaust￿turbocharger Bi-exhaust￿turbocharger￿with￿electrical  wastegate￿valve Mono-scroll￿concept Air￿intake￿duct New￿air￿intake￿duct￿for￿use￿of￿indirect￿charge￿air cooling  New￿clean￿air￿ducts Modified￿intake￿silencer￿in￿engine￿cover Exhaust￿system Optimized￿for￿minimal￿exhaust￿gas￿pressure Electrical￿exhaust￿flaps  Active￿Sound￿Design￿(ASD)￿in￿the￿passenger compartment Sports￿exhaust￿system￿as￿optional￿equipment New￿design Identical￿concept Vacuum￿system...
  • Page 15 S58￿Engine 1.￿Introduction Fuel￿preparation Component Comment Same Injectors Solenoid￿injectors  Injectors￿for￿CVO￿support High￿pressure￿pump  Double￿high￿pressure￿pump New￿design Identical￿concept Cooling Component Comment Same High-temperature Revised￿for￿high-performance￿operation circuit without￿power￿restriction for￿engine￿cooling New￿mechanical￿coolant￿pump￿(higher￿delivery rate￿and￿delivery￿head) Additional￿electric￿coolant￿pump￿for￿exhaust  turbocharger Cooling￿throttle￿body Split￿cooling￿discontinued Heat￿management￿module￿dispensed￿with Data-map￿thermostat Low-temperature￿circuit Indirect￿charge￿air￿cooling￿with￿two￿heat for￿charge￿air￿cooling exchangers  Own￿coolant￿circuit Electric￿coolant￿pump New￿design...
  • Page 16 S58￿Engine 2.￿Engine￿History 2.1.￿Variants￿of￿the￿BMW￿6-cylinder￿M￿engines Engine Version Series Displacement Stroke/ Power￿in Torque￿in in￿cm³ Bore￿hole kW/HP Nm/lb-ft in￿mm S52B30 2990 85.8/86.06 177/240 6000 4250 S52B32 3152 89.6/86.4 177/240 6000 3800 S54B32 3246 91.0/87.0 248/338 7900 4900 S55B30 2979 89.6/84.0 317/425 550/406 5500-7300 1850-5500...
  • Page 17 S58￿Engine 3.￿Engine￿Identification 3.1.￿Engine￿designation￿and￿engine￿identification 3.1.1.￿Engine￿designation In￿the￿technical￿documentation,￿the￿engine￿designation￿is￿used￿to￿ensure￿unambiguous￿identification of￿the￿engine. The￿technical￿documentation￿also￿contains￿the￿short￿form￿of￿the￿engine￿designation￿S58,￿which￿only indicates￿the￿engine￿type. Position Meaning Index/Explanation Engine￿developer M,￿N￿=￿BMW￿Group P￿=￿BMW￿M￿Sport S￿=￿BMW￿M￿GmbH W￿=￿External￿developer Engine￿type 1￿=￿R4￿(e.g.￿N12) 4￿=￿R4￿(e.g.￿N43) 5￿=￿R6￿(e.g.￿N53) 6￿=￿V8￿(e.g.￿N63) 7￿=￿V12￿(e.g.￿N73) 8￿=￿V10￿(e.g.￿S85) Change￿to￿the￿basic 0￿=￿Basic￿design engine￿concept 1￿to￿9￿=￿Modifications, e.g.￿to￿combustion￿process Working￿method￿or￿fuel￿type￿and B￿=￿Petrol,￿longitudinal possibly￿installation￿position installation D￿=￿Diesel,￿longitudinal installation H￿=￿Hydrogen Displacement￿in￿liters 1￿=￿1￿liter￿+ Displacement￿in￿1/10￿liter 8￿=￿0.8￿liters￿=￿1.8￿liters Performance￿class K= Lowest...
  • Page 18 S58￿Engine 3.￿Engine￿Identification Breakdown￿of￿the￿S58￿engine￿designation Index Explanation BMW￿M￿GmbH￿development 6-cylinder￿in-line￿engine Petrol￿engine￿with￿Turbo-Valvetronic￿direct injection￿(TVDI) Petrol￿engine,￿longitudinal￿installation 3.0￿liters￿displacement TOP￿performance￿class New￿development...
  • Page 19 S58￿Engine 4.￿Engine￿Mechanical 4.1.￿Engine￿housing The￿engine￿housing￿comprises￿the￿crankcase,￿the￿cylinder￿head,￿the￿cylinder￿head￿cover,￿the￿sump and￿the￿gaskets. 4.1.1.￿Oil￿sump The￿sump￿of￿the￿S58￿engine￿is￿a￿cast￿aluminium￿design￿made￿of￿AlSi9Cu3.￿The￿sump￿originally￿made of￿magnesium￿on￿the￿S55￿engine￿was￿also￿replaced￿by￿cast￿aluminium￿sump￿in￿the￿course￿of￿life-cycle development￿of￿the￿S55￿engine.￿An￿additional￿partition￿in￿the￿area￿of￿the￿drive￿shaft￿passages￿in￿the forward￿area￿of￿the￿sump￿further￿restricts￿oil￿movement￿under￿longitudinal￿and￿lateral￿acceleration forces. S58￿engine,￿oil￿sump Index Explanation Oil-level￿sensor￿mount Bulkhead Output￿shaft￿passage Oil￿drain￿plug To￿ensure￿that￿the￿engine￿oil￿in￿the￿front,￿smaller￿sump￿is￿drained￿completely￿during￿an￿engine￿oil service,￿the￿sump￿features￿a￿small￿drain￿hole￿through￿which￿the￿engine￿oil￿can￿flow￿into￿the￿rear￿sump. Sealing￿of￿the￿sump￿against￿the￿crankcase￿is￿provided￿by￿means￿of￿a￿spray-on￿silicon￿sealant.

  • Page 20: Crankcase

    S58￿Engine 4.￿Engine￿Mechanical The￿precise￿procedure￿for￿sealing￿the￿sump￿can￿be￿found￿in￿the￿up-to-date￿information￿in￿the￿BMW workshop￿system￿ISTA. 4.1.2.￿Crankcase The￿crankcase￿of￿the￿S58￿engine￿is￿made￿of￿gravity￿die-cast￿Al￿Si￿7￿Cu￿0.5￿Mg. As￿a￿heat￿management￿module￿is￿not￿used￿on￿the￿S58￿engine,￿the￿coolant￿ducts￿and￿the￿coolant pump￿mounting￿have￿had￿to￿be￿adapted￿to￿the￿crankcase. That￿involved￿increasing￿the￿cross-sections￿of￿the￿water￿chambers￿in￿order￿to￿minimize￿the￿flow velocity￿of￿the￿coolant￿in￿the￿crankcase￿as￿much￿as￿possible￿due￿to￿the￿high￿delivery￿rate￿of￿approx. 300 l/min￿of￿the￿new￿coolant￿pump. Furthermore,￿the￿mounting￿points￿for￿the￿ancillary￿components￿specific￿to￿the￿S58￿engine￿have￿been adapted￿to￿the￿crankcase,￿and￿the￿oil￿ducts￿for￿piston￿cooling￿via￿the￿oil￿spray￿nozzles￿have￿been integrated.
  • Page 21 S58￿Engine 4.￿Engine￿Mechanical S58￿engine,￿crankcase Index Explanation Engine￿oil￿duct￿for￿spray￿nozzles Engine￿oil￿return,￿exhaust￿side Engine￿coolant￿ducts￿(water￿chamber￿passages) Coolant￿pump￿mounting Intake-side￿engine￿oil￿return￿and￿gas￿replacement￿duct Cylinder￿liners,￿LDS-coated Coolant￿duct￿(coolant￿return￿to￿radiator) Oil￿filter￿module￿mounting...
  • Page 22 S58￿Engine 4.￿Engine￿Mechanical S58￿engine,￿ventilation￿bore￿holes￿in￿the￿crankcase The￿crankcase￿has￿drilled￿longitudinal￿ventilation￿holes￿(a).￿Those￿longitudinal￿ventilation￿holes (a)￿improve￿pressure￿equalization￿between￿the￿oscillating￿air￿columns￿created￿by￿the￿up￿and￿down movement￿of￿the￿pistons. In￿addition,￿adaptations￿of￿the￿connections￿to￿the￿two￿exhaust￿turbochargers,￿were￿necessary￿for￿the oil￿supply￿and￿coolant￿cooling. 4.1.3.￿Cylinder￿head￿gasket In￿contrast￿with￿the￿B58TU￿engine,￿the￿cylinder￿head￿gasket￿in￿the￿S58￿engine￿is￿made￿up￿of￿4￿layers (3￿layers￿in￿the￿B58TU￿engine)￿because￿the￿combustion￿pressure￿is￿higher￿than￿in￿the￿S58￿engine. Furthermore,￿the￿contact￿faces￿with￿the￿cylinder￿head￿and￿cylinder￿block￿are￿no￿longer￿fully￿coated but￿instead￿have￿a￿partial￿screen￿print￿coating.￿The￿cylinder￿head￿gasket￿has￿been￿adapted￿to￿the crankcase￿and￿the￿cylinder￿head￿in￿terms￿of￿the￿sealing￿bead￿pattern.
  • Page 23 S58￿Engine 4.￿Engine￿Mechanical S58￿engine,￿cylinder￿head￿gasket￿coating Index Explanation Cylinder￿head￿gasket Partial￿screen￿printing￿coating 4.1.4.￿Cylinder￿head The￿cylinder￿head￿of￿the￿S58￿engine￿has￿been￿adapted￿to￿motor￿racing￿requirements.￿The￿basic design￿of￿the￿cylinder￿head￿matches￿that￿of￿the￿B58TU￿engine.￿In￿addition,￿the￿cylinder￿head￿has a￿core￿manufactured￿using￿a￿3D￿printing￿process.￿The￿additive￿manufacturing￿process￿makes￿it possible￿to￿produce￿geometrical￿shapes￿that￿cannot￿be￿achieved￿with￿conventional￿metal￿casting methods.￿Thanks￿to￿3D￿printing￿technology,￿the￿cylinder￿head￿core￿of￿the￿new￿engine￿is￿lighter￿in weight￿and￿has￿optimized￿coolant￿duct￿routing￿in￿temperature￿management￿terms.￿The￿S58￿engine again￿features￿direct￿injection,￿turbocharger￿aspiration￿and￿Valvetronic￿valve￿timing.￿The￿cylinder￿head is￿very￿compact￿and￿is￿equipped￿with￿the￿4th-generation￿Valvetronic￿technology. The￿combination￿of￿exhaust￿turbocharger,￿Valvetronic￿and￿direct￿fuel￿injection￿is￿known￿as Turbo￿Valvetronic￿Direct￿Injection￿(TVDI).
  • Page 24 S58￿Engine 4.￿Engine￿Mechanical S58￿engine,￿cylinder￿head The￿cylinder￿head￿of￿the￿S58￿engine￿has￿been￿redesigned￿with￿regard￿to￿coolant￿duct￿routing. Thus,￿the￿S58￿engine￿does￿not￿feature￿the￿split-cooling￿concept￿used￿on￿the￿B58TU￿engine. In￿addition,￿the￿mountings￿for￿the￿two￿high-pressure￿pumps￿on￿the￿cylinder￿head￿have￿been￿adapted. 4.1.5.￿Cylinder￿head￿cover Design The￿cylinder￿head￿cover￿is￿a￿new￿part￿on￿the￿S58￿engine.￿As￿distinct￿from￿the￿cylinder￿head￿cover￿of the￿B58TU￿engine,￿the￿mounts￿for￿the￿two￿high￿pressure￿pumps￿are￿machined￿into￿the￿cylinder￿head cover￿of￿the￿S58￿engine. All￿the￿components￿for￿crankcase￿ventilation￿and￿the￿blow-by￿ducts￿are￿also￿integrated￿in￿the￿cylinder head￿cover.￿The￿integrated￿valves￿ensure￿that￿the￿blow-by￿gases￿are￿reliably￿fed￿into￿the￿intake￿air. The￿S58￿engine￿is￿equipped￿with￿a￿positively￿controlled￿crankcase￿ventilation￿system.
  • Page 25 S58￿Engine 4.￿Engine￿Mechanical S58￿engine,￿cylinder￿head￿cover￿with￿crankcase￿ventilation Index Explanation Through-holes￿for￿injectors Mountings￿for￿high￿pressure￿pumps Housing,￿chain￿drive Mount￿for￿exhaust-side￿VANOS￿solenoid￿valve￿actuator Mount￿for￿intake-side￿VANOS￿solenoid￿valve￿actuator Particle￿separator Blow-by￿gas￿distributor￿rail Crank￿case￿vent￿valve Oil￿filler￿neck Oil￿filler￿cap Blow-by￿gas￿duct Through-holes￿for￿spark￿plugs Accommodates￿the￿camshaft￿sensor...
  • Page 26 S58￿Engine 4.￿Engine￿Mechanical The￿blow-by￿gases￿pass￿through￿the￿opening￿in￿the￿area￿of￿no.￿6-cylinder￿into￿the￿settling￿chamber in￿the￿cylinder￿head￿cover.￿From￿the￿settling￿chamber,￿the￿blow-by￿gases￿pass￿through￿the￿particle separator￿with￿ball￿valve￿where￿they￿are￿separated￿from￿the￿oil￿by￿an￿artificial-felt￿element.￿The￿blow- by￿gases￿separated￿from￿the￿oil￿next￿pass￿either￿through￿the￿crankcase￿vent￿valve￿via￿the￿cylinder￿head into￿the￿intake￿area￿upstream￿of￿the￿intake￿valves￿or￿to￿the￿intake￿area￿upstream￿of￿the￿turbocharger, depending￿on￿the￿engine￿operating￿mode.￿The￿separated￿oil￿is￿directed￿via￿a￿return￿duct￿discharging into￿the￿sump￿below￿the￿oil￿level.￿A￿non-return￿valve￿in￿the￿lower￿part￿of￿the￿crankcase￿in￿the￿area￿of￿the sump￿ensures￿that￿no￿oil￿from￿the￿sump￿can￿pass￿into￿the￿crankcase￿ventilation￿system￿from￿the￿sump. The￿precise￿procedure￿for￿removing￿and￿installing￿the￿cylinder￿head￿cover￿can￿be￿found￿in￿the￿up-to- date￿information￿in￿the￿BMW￿workshop￿system￿ISTA. Operating￿principle The￿standard￿function￿can￿only￿be￿utilized￿while￿there￿is￿a￿vacuum￿in￿the￿intake￿plenum,￿i.e.￿in￿naturally aspirated￿mode. In￿naturally￿aspirated￿mode,￿the￿crankcase￿vent￿valve￿and￿the￿ball￿valve￿in￿the￿particle￿separator￿in￿the cylinder￿head￿cover￿are￿opened￿by￿the￿vacuum￿in￿the￿intake￿plenum.￿The￿blow-by￿gases￿are￿routed￿via the￿distributor￿rail￿integrated￿in￿the￿cylinder￿head￿cover￿directly￿into￿the￿cylinder￿head￿intake￿ports.
  • Page 27 S58￿Engine 4.￿Engine￿Mechanical S58￿engine,￿naturally￿aspirated￿mode Index Explanation Clean￿blow-by￿gas Blow-by￿gas Control￿spring Artificial-felt￿element￿for￿oil￿separation Ball￿valve Bulkhead Crank￿case￿vent￿valve Blow-by￿gas￿ducts Once￿the￿pressure￿in￿the￿intake￿plenum￿rises,￿it￿is￿no￿longer￿possible￿for￿the￿blow-by￿gases￿to￿be introduced￿via￿this￿route.￿The￿crankcase￿vent￿valve￿seals￿off￿the￿duct￿to￿the￿intake￿plenum. The￿then￿greater￿intake-air￿demand￿generates￿a￿vacuum￿in￿the￿clean￿air￿pipe￿between￿the turbocharger￿and￿the￿intake￿silencer.￿That￿vacuum￿is￿sufficient￿to￿keep￿the￿ball￿valve￿in￿the￿particle separator￿in￿the￿cylinder￿head￿cover￿open￿and￿draw￿off￿the￿blow-by￿gases.
  • Page 28 S58￿Engine 4.￿Engine￿Mechanical S58￿engine,￿turbocharger-aspirated￿mode Index Explanation Clean￿blow-by￿gas Blow-by￿gas Control￿spring Ball￿valve Artificial-felt￿element￿for￿oil￿separation Bulkhead Blow-by￿gas￿ducts Blow-by￿gas￿ducts￿in￿the￿cylinder￿head Blow-by￿gas￿introduction...
  • Page 29 S58￿Engine 4.￿Engine￿Mechanical If￿there￿is￿a￿complaint￿about￿higher￿oil￿consumption￿and￿at￿the￿same￿time￿an￿exhaust￿turbocharger fouled￿with￿oil￿is￿diagnosed,￿then￿it￿cannot￿be￿immediately￿concluded￿that￿the￿exhaust￿turbocharger is￿faulty.￿If￿the￿fouling￿is￿already￿present￿after￿the￿introduction￿of￿the￿blow-by￿gases,￿then￿the￿entire engine￿must￿be￿checked￿for￿leaks.￿The￿cause￿of￿an￿excessive￿blow-by￿gas￿flow￿rate￿may￿be￿faulty gaskets￿or￿crankshaft￿seals.￿Leaking￿crankshaft￿seals￿may￿generate￿oil￿consumption￿of￿up￿to￿3 liters/1000￿km￿(620￿miles). 4.1.6.￿Engine￿cover The￿engine￿cover￿was￿adapted￿to￿the￿S58￿engine.￿The￿engine￿cover￿is￿also￿the￿intake￿silencer￿of￿the S58￿engine. S58￿engine,￿engine￿cover 4.2.￿Crankshaft 4.2.1.￿Crankshaft￿with￿bearings Crankshaft The￿crankshaft￿is￿an￿optimized-weight￿design￿and￿has￿been￿adapted￿to￿the￿high-revving characteristics￿and￿greater￿power￿output￿of￿the￿S58￿engine.￿Thus￿the￿crankshaft￿of￿the￿S58￿engine weighs￿approx.￿21.2 kg￿(47￿lbs).￿The￿crankshaft￿is￿also￿called￿a￿lightweight￿construction￿crankshaft. The￿crankshaft￿is￿made￿from￿a￿steel￿alloy￿42CrMoS4￿Mod￿and￿is￿then￿nitrocarbonized￿in￿the￿gas. The￿timing￿chain￿and￿oil￿pump￿are￿connected￿by￿gears.
  • Page 30 S58￿Engine 4.￿Engine￿Mechanical S58￿engine,￿crankshaft Index Explanation Main￿bearing Drive￿for￿oil￿pump￿and￿valve￿gear Connecting￿rod￿bearing Crankshaft￿main￿bearing The￿crankshaft￿main￿bearings￿are￿adapted￿to￿the￿S58￿engine.￿Adaptations￿were￿necessary￿in￿order to￿satisfy￿the￿higher￿demands￿of￿the￿high-revving￿design.￿The￿bearings￿are￿a￿lead-free￿design.￿The material￿combination￿for￿the￿lower￿bearing￿shells￿takes￿the￿form￿of￿a￿Federal￿Mogul￿G488.￿For￿the upper￿bearing￿shells￿a￿Federal￿Mogul￿G490￿is￿used.￿The￿thrust￿bearing￿is￿located￿at￿the￿4th￿bearing position. When￿replacing￿the￿crankshaft￿main￿bearings,￿the￿bearing￿shell￿classification￿must￿be￿taken￿into account.￿The￿precise￿procedure￿for￿replacing￿the￿crankshaft￿main￿bearing￿shells￿can￿be￿found￿in￿the up-to-date￿information￿in￿the￿BMW￿workshop￿system￿ISTA. 4.2.2.￿Connecting￿rod￿with￿bearing The￿forged￿connecting￿rod￿of￿the￿S58￿engine￿has￿a￿nominal￿length￿of￿151.1 mm.￿The￿connecting rod￿is￿a￿carry-over￿part￿from￿the￿S63B44T4￿engine.￿As￿with￿other￿BMW￿engines,￿the￿small￿end￿has￿a profiled￿bore.￿The￿force￿acting￿from￿the￿piston￿via￿the￿wrist￿pin￿is￿optimally￿distributed￿to￿the￿bushing surface￿by￿this￿shaped￿bore￿and￿the￿edge￿load.
  • Page 31 S58￿Engine 4.￿Engine￿Mechanical The￿big-end￿bearing￿shells￿are￿of￿the￿lead-free￿type.￿Consequently,￿a￿Federal￿Mogul￿G488￿is￿used￿on both￿the￿rod￿side￿and￿the￿bearing-cap￿side. S58￿engine,￿connecting￿rod￿bearing Index Explanation Piston Connecting￿rod Crankshaft Connecting￿rod￿bearing...
  • Page 32 S58￿Engine 4.￿Engine￿Mechanical 4.2.3.￿Piston￿with￿wrist￿pin￿and￿piston￿rings The￿shape￿and￿material￿properties￿of￿the￿piston￿have￿been￿adapted￿to￿the￿higher￿demands￿in￿terms￿of the￿high-revving￿design￿of￿the￿S58￿engine￿with￿a￿rated￿engine￿speed￿of￿7500 rpm. A￿forged￿slipper-skirt￿piston￿made￿by￿the￿manufacturer￿Mahle￿is￿used.￿The￿piston￿is￿made￿from￿the M142P￿alloy￿(AlSi12Cu3Ni2Mg).￿This￿alloy￿is￿particularly￿suitable￿for￿high-performance￿petrol￿engines. For￿the￿S58￿engine,￿the￿piston￿alloy￿is￿formed￿by￿forging,￿which￿produces￿slightly￿different￿micro- structures￿and￿properties.￿That￿is￿indicated￿by￿the￿suffix￿"P"￿in￿the￿alloy￿designation. The￿piston￿skirt￿is￿Grafal-coated,￿which￿is￿necessary￿due￿to￿the￿LDS-coated￿cylinder￿liners. The￿piston￿diameter￿is￿84 mm.￿The￿first￿piston￿ring￿is￿a￿nitride￿plain￿rectangular￿compression￿ring. The￿2nd￿piston￿ring￿is￿a￿taper-faced￿piston￿ring.￿The￿oil￿scraper￿ring￿is￿a￿nitride￿ES￿oil￿scraper￿ring. S58￿engine,￿piston￿with￿wrist￿pin￿and￿piston￿rings Index Explanation Plain￿compression￿ring Taper-faced￿piston￿ring ES￿oil￿scraper￿ring...
  • Page 33 S58￿Engine 4.￿Engine￿Mechanical Wrist￿pin The￿wrist￿pin￿with￿circlip￿was￿revised￿accordingly￿to￿the￿higher￿requirements￿in￿the￿S58￿engine. The￿material￿and￿the￿strength￿were￿adapted￿to￿satisfy￿the￿high-speed￿concept. A￿so-called￿wrist￿pin￿with￿restricted￿volume￿change￿with￿23￿mm￿diameter￿is￿used.￿The￿wrist￿pin￿is made￿from￿the￿alloy￿16MnCr5￿and￿then￿case￿hardened￿(DLC￿diamond-like￿carbon). 4.3.￿Camshaft￿drive/chain￿drive The￿entire￿chain￿drive￿system￿driving￿the￿camshafts￿on￿the￿S58￿engine￿has￿been￿carried￿over￿from￿the N58TU￿engine.￿As￿on￿the￿B58TU￿engine,￿the￿composite￿camshafts￿are￿driven￿by￿an￿adapted￿single bushed-roller￿chain￿with￿154￿links.￿The￿tensioning￿rail￿is￿a￿carry-over￿part￿from￿the￿B58TU￿engine, while￿the￿bushed-roller￿chain￿itself￿and￿the￿guide￿rail￿have￿been￿adapted￿to￿the￿high-revving￿concept and￿higher￿power￿of￿the￿S58￿engine.
  • Page 34 S58￿Engine 4.￿Engine￿Mechanical S58￿engine,￿chain￿drive Index Explanation Slide￿rail￿with￿holder Bushed-roller￿chain￿for￿camshafts Chain￿tensioner Tensioning￿rail Bushed-roller￿chain￿for￿oil￿pump Oil￿pump￿sprocket Guide￿rail As￿on￿the￿B58TU￿engine,￿the￿oil￿pump￿is￿driven￿by￿a￿single￿bushed-roller￿chain￿with￿58￿links.
  • Page 35 S58￿Engine 5.￿Valve￿Gear 5.1.￿Design The￿following￿graphic￿shows￿the￿design￿of￿the￿cylinder￿head￿on￿the￿S58￿engine￿with￿the￿combination of￿Valvetronic￿IV￿and￿direct￿injection. The￿way￿in￿which￿the￿Valvetronic￿IV￿functions￿is￿the￿same￿as￿on￿the￿modular￿engines￿and￿is￿therefore not￿described￿in￿this￿product￿information. S58￿engine,￿overview￿of￿valve￿gear Index Explanation Spark￿plug￿shaft Injector￿shaft Exhaust￿camshaft Mounts￿for￿high￿pressure￿pump￿1 Mounts￿for￿high￿pressure￿pump￿2 VANOS￿unit,￿exhaust￿camshaft VANOS￿solenoid￿valve￿actuator,￿exhaust VANOS￿solenoid￿valve￿actuator,￿intake VANOS￿unit,￿intake￿camshaft Camshaft￿sensor￿reluctor￿ring,￿intake￿side Torsion￿spring Eccentric￿shaft...

  • Page 36: Camshafts

    S58￿Engine 5.￿Valve￿Gear Index Explanation Gate Intake￿camshaft Valvetronic￿servomotor Bore￿hole￿for￿introduction￿of￿blow-by￿gas 5.1.1.￿Camshafts In￿the￿S58￿engine,￿similar￿to￿the￿S55￿engine,￿only￿lightweight￿construction￿camshafts￿are￿used.￿The lightweight-design￿camshafts￿for￿the￿S58￿engine￿are￿composite￿camshafts￿as￿used￿on￿the￿modular engines. S58￿engine,￿composite￿camshaft Index Explanation Camshaft￿sensor￿reluctor￿ring,￿exhaust￿side Exhaust￿camshaft Triple￿cam￿for￿high￿pressure￿pump￿1 Flats￿for￿open-end￿spanner Triple￿cam￿for￿high￿pressure￿pump￿2 Mount￿for￿VANOS￿adjuster,￿exhaust￿side...

  • Page 37: Timing

    S58￿Engine 5.￿Valve￿Gear Index Explanation Mount￿for￿VANOS￿adjuster,￿intake￿side Flats￿for￿open-end￿spanner Camshaft￿sensor￿reluctor￿ring,￿intake￿side Intake￿camshaft The￿camshafts￿have￿been￿adapted￿to￿the￿high-revving￿concept￿of￿the￿S58￿engine￿in￿terms￿of￿cam shape￿and￿timing.￿In￿addition,￿the￿exhaust￿camshaft￿also￿has￿double￿cams￿for￿driving￿the￿high-pressure pump.￿The￿reluctor￿rings￿for￿the￿camshaft￿sensors￿have￿been￿realigned￿in￿comparison￿with￿the￿B58TU engine. 5.1.2.￿Timing S58￿engine,￿timing￿diagram Index Explanation Exhaust Intake B58B30O1 S58B30T0 Intake￿valve￿diameter [mm] 30.1 30.1 Exhaust￿valve￿diameter [mm] 28.5 28.5 Maximum￿valve￿lift,￿intake/exhaust [mm] 9.9/9.7 9.9/9.7 valve Steering￿axis￿inclination,￿intake [crankshaft camshaft￿(VANOS￿adjustment￿range) degrees] Steering￿axis￿inclination,￿exhaust [crankshaft camshaft￿(VANOS￿adjustment￿range)
  • Page 38 S58￿Engine 5.￿Valve￿Gear B58B30O1 S58B30T0 Camshaft￿adjustment,￿intake [crankshaft 122.5–52.5 129.5–59.5 degrees] Camshaft￿adjustment,￿exhaust [crankshaft 120–60 120–60 degrees] Opening￿period [crankshaft 258.2 273.5 Intake￿camshaft degrees] Opening￿period [crankshaft 261.9 262.3 Exhaust￿camshaft degrees] 5.1.3.￿Intake￿and￿exhaust￿valves The￿valve￿stem￿of￿the￿intake￿valve￿has￿a￿diameter￿of￿4.92￿mm.￿For￿the￿exhaust￿valve￿the￿diameter￿is 5.92￿mm.￿The￿reason￿for￿the￿larger￿diameter￿is￿that￿the￿exhaust￿valve￿is￿hollow￿and￿has￿a￿sodium￿filling. In￿addition,￿the￿valve￿seat￿of￿the￿exhaust￿valve￿is￿armor-plated. In￿contrast￿with￿the￿B58TU,￿the￿intake￿valve￿material￿for￿the￿S58￿engine,￿has￿been￿upgraded￿to￿a higher-quality￿alloy￿material￿to￿cope￿with￿the￿thermal￿and￿higher￿stress￿on￿the￿engine. 5.1.4.￿Valve￿springs Due￿to￿the￿different￿shaft￿diameters￿between￿the￿intake￿and￿exhaust￿valves￿the￿valve￿springs￿are different. 5.2.￿Valvetronic 5.2.1.￿VANOS Overview The￿design￿and￿function￿of￿the￿variable￿camshaft￿timing￿system￿on￿the￿S58￿engine￿is￿the￿same￿as￿on the￿B58TU￿engine.￿The￿VANOS￿system￿had￿already￿been￿optimized￿by￿virtue￿of￿the￿single￿chain￿drive on￿the￿B58TU￿engine￿in￿comparison￿with￿the￿B58￿engine.￿That￿optimization￿resulted￿in￿shorter￿and...
  • Page 39 S58￿Engine 5.￿Valve￿Gear 5.2.2.￿Valve￿lift￿control Overview As￿can￿be￿seen￿from￿the￿following￿graphic,￿the￿design￿of￿the￿valve￿lift￿control￿system￿has￿not￿changed in￿comparison￿with￿the￿B58TU￿engine. Due￿to￿the￿higher￿engine￿speeds￿of￿the￿S58￿of￿up￿to￿7500 rpm,￿the￿working￿curve￿of￿the￿eccentric shaft￿and￿intermediate￿lever￿has￿been￿adapted. S58￿engine,￿valve￿lift￿control Index Explanation Exhaust￿camshaft Intermediate￿lever Intake￿camshaft Gate Torsion￿spring Eccentric￿shaft Valvetronic￿servomotor Roller￿cam￿follower,￿intake￿side Hydraulic￿valve￿clearance￿compensator,￿intake￿side Valve￿spring,￿intake￿side Intake￿valve...
  • Page 40 S58￿Engine 5.￿Valve￿Gear Index Explanation Exhaust￿valve Valve￿spring,￿exhaust￿side Hydraulic￿valve￿clearance￿compensator,￿exhaust￿side Roller￿cam￿follower,￿exhaust￿side...
  • Page 41 S58￿Engine 6.￿Belt￿Drive￿&￿Ancillary￿Components 6.1.￿Belt￿drive Due￿to￿the￿modified￿design,￿the￿belt￿drive￿stem￿has￿had￿to￿be￿adapted.￿Between￿the￿combined vibration￿absorber￿and￿belt￿pulley￿on￿the￿crankshaft￿and￿the￿air￿conditioning￿compressor,￿an￿additional tensioning￿pulley￿is￿used.￿With￿help￿of￿the￿additional￿tensioning￿pulley￿possible￿oscillations￿of￿the￿drive belt￿between￿the￿vibration￿absorber￿with￿belt￿pulley￿and￿air￿conditioning￿compressor￿are￿suppressed. S58￿engine,￿belt￿drive Index Explanation Belt￿pulley,￿alternator Ribbed V-belt Belt￿tensioner Belt￿pulley,￿A/C￿compressor Additional￿tensioning￿pulley Combined￿vibration￿absorber￿and￿belt￿pulley Coolant￿pump￿belt￿pulley...
  • Page 42 S58￿Engine 6.￿Belt￿Drive￿&￿Ancillary￿Components The￿belt￿pulley￿for￿driving￿the￿coolant￿pump￿has￿been￿made￿as￿large￿in￿diameter￿as￿possible￿in order￿to￿reduce￿the￿speed￿of￿the￿pump￿and,￿thereby,￿the￿coolant￿delivery￿rate￿at￿high￿engine￿speeds (cavitation). The￿diameter￿of￿the￿belt￿pulley￿for￿driving￿the￿alternator￿has￿been￿changed￿in￿comparison￿with￿the￿one on￿the￿B58TU￿engine.￿That￿was￿necessary￿because,￿as￿a￿result￿of￿the￿higher￿revving￿speeds￿of￿the S58￿engine￿compared￿with￿the￿B58TU￿engine,￿the￿alternator￿would￿otherwise￿have￿been￿driven￿too fast.
  • Page 43 S58￿Engine 7.￿Oil￿Supply 7.1.￿Differences￿in￿the￿oil￿supply • Sump￿with￿a￿small￿front￿oil￿sump￿as￿a￿volume￿buffer • Aluminium￿frame￿with￿oil￿extraction￿pipes￿and￿ducts￿bolted￿to￿the￿crankcase • Plastic￿cover￿with￿integrated￿gasket￿for￿better￿separation￿of￿the￿front￿and￿rear￿sump￿partitions • Oil￿pump￿as￿external￿gear￿pump￿with￿map￿control • Additional￿twin￿oil￿return￿pumps • Two￿oil￿spray￿nozzles￿per￿cylinder,￿plus￿one￿switchable￿nozzle • Centrally￿controllable￿piston￿cooling￿via￿oil￿spray￿nozzles. 7.2.￿Oil￿supply￿adaptations The￿controlled-volumetric-flow￿pendulum￿vane￿pump￿familiar￿from￿the￿B58TU￿engine￿is￿not￿used on￿the￿S58￿engine.￿The￿reason￿for￿this￿is￿that￿the￿S58￿engine￿has￿an￿additional￿suction￿pump￿for￿the front￿oil￿sump.￿With￿the￿same￿concept￿involving￿a￿volume-flow-controlled￿pendulum-slide￿pump,￿this would￿have￿been￿too￿large￿for￿the￿limited￿packaging￿space.￿In￿addition,￿the￿volume-flow-controlled pendulum-slide￿pump￿used￿in￿the￿B58TU￿engine￿would￿not￿have￿been￿capable￿of￿providing￿a￿reliable oil￿supply￿in￿the￿high￿engine￿speed￿ranges￿that￿occur￿in￿the￿S58￿engine. Therefore,￿a￿spur-gear￿pump￿with￿integrated￿twin￿oil￿return￿pump,￿which￿is￿also￿a￿spur-gear￿pump,￿is used￿on￿the￿S58￿engine.￿This￿combination￿is￿more￿compact￿at￿a￿higher￿delivery￿rate￿than￿the￿volume- flow-controlled￿pendulum-slide￿pump. The￿external￿gear￿pump￿is￿volume-flow-controlled￿and￿is￿supplemented￿by￿a￿map￿control. Bolted￿onto￿the￿intake￿side￿of￿the￿crankcase￿is￿the￿oil￿filter￿module.￿The￿oil￿pressure￿sensor,￿the￿oil temperature￿sensor￿and￿the￿data-map￿control￿valve￿for￿the￿data-map￿controlled￿oil￿pump￿are￿bolted￿to the￿crankcase￿behind￿the￿oil￿filter￿module. The￿sump￿has￿a￿silicon￿sealant￿coating￿and￿is￿bolted￿to￿the￿crankcase.￿The￿sump￿is￿made￿of￿die-cast aluminium￿and￿holds￿the￿oil￿level￿sensor￿and￿the￿oil￿drain￿plug. The￿position￿and￿length￿of￿the￿oil￿pump￿intake￿snorkel￿has￿been￿adapted￿to￿the￿geometric￿shape￿of￿the oil￿pump.￿An￿additional￿twin￿oil￿return￿pump￿is￿flange-mounted￿on￿the￿oil￿pump.￿This￿was￿necessary￿in order￿to￿adapt￿the￿oil￿supply￿to￿racetrack￿use.￿This￿ensures￿a￿secure￿oil￿supply,￿even￿when￿the￿oil￿level is￿displaced￿during￿lateral￿and￿longitudinal￿accelerations,￿as￿can￿occur￿during￿racing￿applications.
  • Page 44 S58￿Engine 7.￿Oil￿Supply S58￿engine,￿oil￿sump￿with￿oil￿pump Index Explanation Oil￿drain￿plug Oil-level￿sensor Oil￿intake￿snorkel,￿sump,￿rear Oil￿filter￿housing Oil￿temperature￿sensor Oil￿pressure￿sensor Map￿control￿valve Characteristic￿map-controlled￿external￿gear￿pump Oil￿pump￿sprocket...
  • Page 45 S58￿Engine 7.￿Oil￿Supply The￿precise￿procedure￿for￿sealing￿the￿sump￿can￿be￿found￿in￿the￿up-to-date￿information￿in￿the￿BMW workshop￿system￿ISTA. 7.3.￿Oil￿pump The￿oil￿pump￿is￿screwed￿to￿the￿crankcase￿and￿is￿driven￿by￿the￿crankshaft￿via￿a￿chain. S58￿engine,￿oil￿sump￿with￿suction￿pump Index Explanation Vacuum￿pump Drive￿gear￿suction￿pump Intake￿port,￿front￿left￿sump￿(oil￿return￿pump) Impeller,￿oil￿return￿pump,￿front￿left￿sump Intake￿port,￿front￿right￿sump￿and￿turbocharger￿(oil￿return￿pump)
  • Page 46 S58￿Engine 7.￿Oil￿Supply Index Explanation Impeller,￿oil￿return￿pump,￿front￿right￿sump￿and￿turbocharger Powertrain￿for￿oil￿pump Pressure￿relief￿valve Oil￿pump￿housing Oil￿pump￿sprocket Control￿plunger Axially￿movable￿impeller Oil￿intake￿snorkel,￿sump,￿rear Drive￿gear￿suction￿pump Pressure￿control￿spring Engine￿oil￿duct From￿the￿oil￿intake￿snorkel,￿the￿oil￿is￿conveyed￿by￿the￿external￿gear￿oil￿pump￿via￿the￿gears￿into￿the engine￿oil￿duct,￿into￿the￿engine￿block￿and￿to￿the￿oil￿filter. The￿non-driven￿oil￿pump￿gear￿can￿be￿axially￿shifted￿in￿this￿pump,￿thereby￿varying￿the￿delivery￿rate. Axial￿shifting￿is￿effected￿by￿the￿oil￿pressure￿from￿the￿filtered￿oil￿duct￿coming￿from￿the￿main￿oil￿duct, which￿can￿be￿varied￿via￿the￿map￿control￿valve￿by￿means￿of￿a￿control￿piston.￿The￿operating￿principle￿of the￿external￿gear￿oil￿pump￿ensures￿that￿the￿required￿oil￿quantity￿and￿the￿oil￿pressure￿are￿supplied￿in each￿case.
  • Page 47 S58￿Engine 7.￿Oil￿Supply S58￿engine,￿external￿gear￿oil￿pump Index Explanation Intake￿side Major￿thrust￿face Direction￿of￿flow/direction￿of￿rotation Oil￿intake￿snorkel￿pressure￿relief￿valve,￿rear￿sump Oil￿duct￿into￿the￿engine￿block￿(unfiltered￿oil) Axially￿movable￿impeller Oil￿pump￿drive￿pressure￿control￿spring...

  • Page 48: Maximum￿Delivery

    S58￿Engine 7.￿Oil￿Supply Index Explanation Intake￿pipe￿with￿strainer Spring￿diaphragm Sprocket Oil￿pump￿sprocket A￿spring￿diaphragm￿(6)￿is￿installed￿at￿the￿end￿of￿the￿intake￿pipe.￿The￿spring￿diaphragm￿dampens￿any acoustically￿conspicuous￿pressure￿vibrations￿caused￿by￿conveying￿of￿the￿unfiltered￿oil￿in￿the￿intake pipe. 7.3.1.￿Maximum￿delivery In￿its￿basic￿position,￿the￿oil￿pump￿is￿held￿in￿the￿maximum￿delivery￿position￿by￿the￿pressure￿control spring￿(1).￿This￿position￿can￿also￿be￿actively￿approached￿via￿the￿map￿control￿valve￿from￿the￿minimum delivery￿position.￿The￿map￿control￿valve￿is￿switched￿so￿that￿the￿oil￿can￿flow￿into￿the￿sump￿via￿the￿map control￿valve.￿This￿position￿of￿the￿data-map￿control￿valve￿simultaneously￿directs￿the￿oil￿pressure￿from the￿filtered￿oil￿duct￿(2)￿via￿the￿oil￿duct￿(12)￿to￿the￿back￿of￿the￿piston￿pressure￿side￿(9)￿of￿the￿axially variable￿pump￿impeller￿(3).￿This￿oil￿pressure￿on￿the￿piston￿(9)￿supports￿the￿pressure￿control￿spring￿(1) and￿presses￿the￿axially￿movable￿impeller￿(3)￿into￿the￿maximum￿delivery￿position.
  • Page 49 S58￿Engine 7.￿Oil￿Supply S58￿engine,￿maximum￿delivery Index Explanation Second￿level￿control￿pressure Map￿control￿pressure Oil￿pressure Pressure￿control￿spring Control￿line,￿second-level￿control￿(emergency￿operation) Axially￿movable￿impeller Pressure￿relief￿valve...

  • Page 50: Minimum￿Delivery

    S58￿Engine 7.￿Oil￿Supply Index Explanation Sprocket Control￿line￿of￿map￿control￿valve￿(map￿control￿pressure) Oil￿pump￿drive Control￿plunger Piston￿pressure￿side￿of￿the￿axially￿movable￿impeller Oil￿duct￿into￿the￿engine￿block￿(unfiltered￿oil) Control￿piston￿spring Second￿level￿control￿pressure Oil￿duct￿to￿the￿piston￿pressure￿side 7.3.2.￿Minimum￿delivery If￿the￿data-map￿control￿valve￿directs￿the￿data-map￿control￿pressure￿via￿the￿control￿line￿(6)￿to￿the￿larger face￿of￿the￿control￿piston￿(8),￿the￿data-map￿control￿pressure￿overcomes￿the￿second-level￿control pressure￿due￿to￿the￿difference￿in￿surface￿area￿on￿the￿control￿piston￿(8).￿The￿map￿control￿pressure presses￿against￿the￿control￿piston￿spring￿and￿thus￿adjusts￿the￿control￿piston￿(8)￿toward￿minimum delivery.￿By￿being￿moved￿to￿the￿minimum￿delivery￿position,￿the￿control￿piston￿(8)￿opens￿the￿oil￿duct to￿the￿piston￿pressure￿side￿(15).￿The￿filtered￿oil￿from￿the￿oil￿duct￿(12)￿is￿now￿conveyed￿to￿the￿front piston￿pressure￿side￿(9)￿of￿the￿axially￿movable￿impeller￿(3).￿On￿account￿of￿the￿axial￿shift￿caused￿by￿the oil￿pressure,￿the￿planes￿of￿contact￿of￿the￿external￿gear￿wheels￿are￿reduced￿and￿the￿delivery￿rate￿of￿the filtered￿oil￿decreases.￿The￿oil￿on￿the￿rear￿piston￿pressure￿side￿can￿flow￿back￿into￿the￿sump￿via￿the￿oil duct￿outlet￿(13)￿and￿the￿oil￿return￿flow￿(14).
  • Page 51 S58￿Engine 7.￿Oil￿Supply S58￿engine,￿minimum￿delivery Index Explanation Second￿level￿control￿pressure Map￿control￿pressure Oil￿pressure Pressure￿control￿spring Control￿line,￿second-level￿control￿(emergency￿operation) Axially￿movable￿impeller Pressure￿relief￿valve...
  • Page 52 S58￿Engine 7.￿Oil￿Supply Index Explanation Sprocket Control￿line,￿second-level￿control￿(emergency￿operation) Oil￿pump￿drive Control￿plunger Piston￿pressure￿side￿of￿the￿axially￿movable￿impeller Oil￿duct￿into￿the￿engine￿block￿(unfiltered￿oil) Second￿level￿control￿pressure Oil￿duct￿outlet Oil￿return￿from￿piston￿to￿sump Oil￿duct￿to￿the￿piston￿pressure￿side Through￿the￿interaction￿of￿the￿map￿control￿with￿the￿control￿piston￿(8),￿the￿delivery￿rate￿of￿the￿oil￿can￿be influenced￿via￿the￿axially￿movable￿impeller￿(3)￿by￿means￿of￿the￿Digital￿Motor￿Electronics￿(DME). 7.3.3.￿Second-level￿control￿(emergency￿operation) During￿normal￿operation￿or￿if￿the￿map￿control￿fails,￿the￿delivery￿rate￿is￿determined￿via￿the￿second￿level control.￿The￿second-level￿control￿pressure￿(2)￿acts￿on￿the￿smaller,￿rear￿surface￿of￿the￿control￿piston￿(8). The￿second￿level￿control￿pressure￿(2)￿presses￿against￿the￿control￿piston￿spring￿and￿thus￿adjusts￿the control￿piston￿(8)￿toward￿minimum￿delivery.￿By￿being￿moved￿towards￿the￿minimum￿delivery￿position, the￿control￿piston￿(8)￿opens￿the￿oil￿duct￿to￿the￿forward￿piston￿pressure￿side￿(15).￿The￿filtered￿oil￿from the￿oil￿duct￿(12)￿is￿now￿conveyed￿to￿the￿front￿piston￿pressure￿side￿(9)￿of￿the￿axially￿movable￿impeller (3).￿On￿account￿of￿the￿axial￿shift￿caused￿by￿the￿oil￿pressure,￿the￿planes￿of￿contact￿of￿the￿external￿gear wheels￿are￿reduced￿and￿the￿delivery￿rate￿of￿the￿filtered￿oil￿decreases. 7.4.￿Map￿control￿valve On￿the￿S58￿engine,￿the￿data-map￿control￿valve￿is￿mounted￿on￿the￿crankcase￿and￿connected￿to￿the￿oil pump￿via￿holes￿drilled￿in￿the￿crankcase. The￿map-controlled￿control￿valve￿is￿a￿proportional￿valve￿which￿can￿control￿the￿oil￿pressure￿steplessly.
  • Page 53 S58￿Engine 7.￿Oil￿Supply S58￿engine,￿characteristic￿map￿control￿valve Index Explanation Voltage￿value,￿maximum￿actuation￿for￿control￿chamber,￿maximum￿pressure Voltage￿value,￿minimum￿actuation￿for￿control￿chamber,￿depressurized Voltage￿value￿at￿50%￿actuation Oil￿duct￿to￿oil￿pump Oil￿duct￿from￿the￿oil￿filter Sealing￿ring Solenoid￿coil Electrical￿connection Valve￿spool Filter The￿oil￿pressure￿sensor￿and￿the￿oil￿temperature￿sensor￿are￿connected￿to￿the￿main￿oil￿duct￿and￿supply the￿actual￿oil￿pressure￿and￿the￿engine￿oil￿temperature￿to￿the￿DME￿control￿unit.￿The￿DME￿calculates the￿required￿target￿oil￿pressure￿based￿on￿the￿engine's￿operating￿point￿and￿the￿temperature.￿A￿pulse- width￿modulated￿signal￿is￿sent￿to￿the￿map-controlled￿control￿valve￿based￿on￿the￿determined￿setpoint deviation.￿Depending￿on￿the￿pulse-width￿modulated￿signal,￿the￿width￿of￿the￿valve￿spool￿opening￿in￿the...

  • Page 54: Oil￿Supply￿During￿High￿Acceleration

    S58￿Engine 7.￿Oil￿Supply map-controlled￿control￿valve￿varies.￿Depending￿on￿the￿available￿opening￿cross-section,￿more￿or￿less engine￿oil￿can￿flow￿from￿the￿oil￿duct￿of￿the￿oil￿filter￿into￿the￿oil￿duct￿and￿to￿the￿oil￿pump.￿This￿oil￿flow changes￿the￿position￿of￿the￿control￿piston￿in￿the￿oil￿pump,￿and￿therefore￿the￿delivery￿rate￿of￿the￿pump. 7.5.￿Oil￿supply￿during￿high￿acceleration In￿order￿to￿adapt￿the￿oil￿supply￿system￿to￿motor￿racing￿requirements,￿a￿twin￿oil￿return￿pump￿has￿been installed￿to￿ensure￿the￿system￿functions￿effectively.￿The￿oil￿return￿pump￿assists￿return￿of￿the￿oil￿from the￿turbochargers￿and￿from￿the￿forward￿sections￿of￿the￿sump￿back￿to￿the￿rear￿section￿of￿the￿sump.
  • Page 55 S58￿Engine 7.￿Oil￿Supply S58￿engine,￿suction￿pump Index Explanation Intake￿side Major￿thrust￿face Direction￿of￿flow/direction￿of￿rotation Return￿pipe Aluminium￿frame...
  • Page 56 S58￿Engine 7.￿Oil￿Supply Index Explanation Suction￿pump Oil￿intake￿snorkel,￿sump,￿rear Return￿opening Oil￿intake￿snorkel,￿sump,￿front￿right Oil￿intake￿snorkel,￿sump,￿front￿left With￿these￿changes,￿the￿oil￿supply￿can￿be￿guaranteed￿up￿to￿a￿longitudinal￿acceleration￿of￿1.3 g.￿Even￿in the￿case￿of￿lateral￿acceleration,￿for￿example￿during￿cornering,￿this￿structure￿enables￿a￿secure￿oil￿supply up￿to￿constant￿1.3￿g. In￿such￿driving￿situations,￿the￿engine￿oil￿is￿drawn￿out￿of￿the￿front￿of￿the￿sump￿through￿the￿front￿oil intake￿snorkel￿by￿the￿return￿pumps￿during￿longitudinal￿acceleration.￿The￿oil￿drawn￿off￿is￿pumped￿back to￿the￿rear￿part￿of￿the￿sump￿via￿the￿return￿pipe￿in￿the￿aluminium￿frame.￿There￿the￿external￿gear￿oil pump￿can￿take￿up￿the￿oil￿again￿via￿the￿rear￿oil￿intake￿snorkel￿and￿deliver￿it￿to￿the￿engine￿lubrication points. Also￿at￿the￿bearing￿positions￿of￿the￿exhaust￿turbocharger￿the￿engine￿oil￿may￿collect￿due￿to￿the centrifugal￿force￿during￿lateral￿acceleration￿conditions.￿This￿prevents￿a￿normal￿backflow￿to￿the￿oil sump￿and￿thus￿also￿a￿supply￿of￿fresh￿cool￿engine￿oil￿at￿the￿bearing￿positions. To￿counteract￿this￿effect,￿at￿the￿bearing￿positions￿of￿the￿exhaust￿turbocharger￿the￿engine￿oil￿is continuously￿drawn￿in￿by￿the￿suction￿pump￿and￿delivered￿to￿the￿oil￿sump. S58￿engine,￿oil￿sump￿with￿suction￿pump...
  • Page 57 S58￿Engine 7.￿Oil￿Supply Index Explanation Sump￿in￿the￿event￿of￿extremely￿negative￿longitudinal￿acceleration (hard￿braking) Sump￿during￿normal￿driving Oil￿intake￿snorkel,￿sump,￿front￿left Oil￿level￿in￿event￿of￿extreme￿negative￿longitudinal￿acceleration￿(hard￿braking) Oil￿intake￿snorkel,￿sump,￿front￿right Oil￿intake￿snorkel,￿sump,￿rear The￿twin￿oil￿return￿pumps￿are￿spur-gear￿oil￿pumps.￿The￿outer￿upper￿chamber￿of￿the￿gear￿pump￿is￿the suction￿chamber.￿The￿oil￿intake￿snorkels￿from￿the￿front￿part￿of￿the￿sump￿are￿connected￿to￿the￿suction chamber￿and￿the￿engine￿oil￿is￿drawn￿off￿through￿the￿aluminium￿frame￿with￿integral￿oil￿return￿pumps. The￿lower￿chamber￿is￿a￿pressure￿chamber.￿Via￿the￿pressure￿chamber,￿the￿drawn-in￿engine￿oil￿is delivered￿back￿to￿the￿rear￿oil￿sump￿via￿the￿return￿opening￿in￿the￿upper￿section￿of￿the￿oil￿pump￿unit. The￿engine￿oil￿in￿the￿rear￿oil￿sump￿is￿thus￿available￿again￿to￿the￿oil￿pump￿via￿the￿oil￿intake￿snorkel. S58￿engine,￿twin￿oil￿return￿pumps...
  • Page 58 S58￿Engine 7.￿Oil￿Supply Index Explanation Intake￿side Major￿thrust￿face Direction￿of￿flow/direction￿of￿rotation Intake￿port￿(turbocharger￿and￿front￿right￿sump) Intake￿port￿(front￿left￿sump) Return￿flow￿opening￿in￿rear￿sump Oil￿pump￿drive Sprocket Pressure￿chamber Impeller 7.6.￿Oil￿spray￿nozzles Two￿types￿of￿oil￿spray￿nozzle￿are￿used￿on￿the￿S58￿engine.￿They￿are￿the￿conventional￿regulated￿oil spray￿nozzles￿with￿a￿permanently￿set￿opening￿and￿closing￿pressure,￿and￿the￿switchable￿oil￿spray nozzles. S58￿engine Switchable￿oil￿spray￿nozzle Opening￿pressure 0 bar Closing￿pressure 0 bar Controlled￿oil￿spray￿nozzle Opening￿pressure >￿4.3 bar Closing￿pressure <￿4.0 bar The￿controlled￿oil￿spray￿nozzles￿used￿on￿the￿intake￿side￿of￿the￿crankcase￿are￿conventional￿oil￿spray nozzles￿with￿a￿permanently￿set￿opening￿and￿closing￿pressure. The￿oil￿spray￿nozzles￿do￿not￿open￿until￿the￿oil￿pressure￿reaches￿4.3 bar￿in￿order￿to￿ensure￿sufficient piston￿crown￿cooling￿regardless￿of￿the￿load￿at￿high￿engine￿speeds.￿The￿oil￿spray￿nozzles￿close￿again￿if the￿oil￿pressure￿falls￿below￿4 bar. The￿switched￿oil￿spray￿nozzles￿on￿the￿exhaust￿side￿are￿brought￿into￿action￿for￿cooling￿at￿high￿loads￿and engine￿speeds￿and￿also￿for￿lubrication￿at￿very￿low￿engine￿speeds￿with￿high￿engine￿loads. In￿order￿to￿achieve￿an￿optimum￿cooling￿effect,￿it￿is￿essential￿to￿position￿the￿oil￿spray￿nozzles￿exactly. Non-compliance￿may￿lead￿to￿damage￿to￿the￿engine.￿Please￿observe￿the￿current￿repair￿instructions￿in the￿BMW￿workshop￿system￿ISTA.

  • Page 59: Centrally￿Controllable￿Piston￿Cooling￿Via￿Oil￿Spray￿Nozzles

    S58￿Engine 7.￿Oil￿Supply 7.7.￿Centrally￿controllable￿piston￿cooling￿via￿oil￿spray￿nozzles In￿addition￿to￿the￿bearing￿positions,￿the￿oil￿pump￿also￿supplies￿the￿oil￿spray￿nozzles￿with￿the￿required volumetric￿flow,￿whereby￿the￿consumption￿of￿the￿oil￿spray￿nozzles￿significantly￿influences￿the￿power￿of the￿oil￿pump. For￿that￿reason,￿the￿S58￿engine￿is￿the￿first￿petrol￿engine￿to￿feature￿centrally￿controllable￿piston￿cooling. Deactivating￿the￿piston￿cooling￿reduces￿the￿oil￿pump￿power.￿In￿turn,￿this￿reduces￿the￿power￿loss￿of￿the engine￿and￿saves￿fuel￿in￿the￿partial￿load￿range￿with￿the￿same￿vehicle￿performance. The￿centrally￿controllable￿piston￿cooling￿has￿the￿following￿special￿features: • Additional￿oil￿ducts￿in￿the￿cylinder￿crankcase • Oil￿spray￿nozzles￿without￿defined￿opening￿pressure • Piston￿cooling￿control￿valve • Piston￿cooling￿relay￿valve. The￿central￿valve￿controls￿the￿oil￿spray￿nozzles￿on￿the￿exhaust￿side￿of￿the￿crankcase.￿This￿enables requirement-based￿piston￿cooling￿over￿the￿entire￿characteristic￿map￿range￿of￿the￿engine. The￿following￿system￿overview￿provides￿an￿initial￿outline￿of￿the￿structure￿of￿the￿piston￿cooling￿in￿the S58￿engine. S58￿engine,￿piston￿cooling Index Explanation Piston￿cooling￿active￿(piston￿cooling￿control￿valve￿de-energized) Piston￿cooling￿not￿active￿(piston￿cooling￿control￿valve￿energized) Oil￿pressure Depressurized Oil￿pump Oil￿spray￿nozzle Oil￿duct￿to￿the￿oil￿spray￿nozzles...

  • Page 60: Relay￿Valve￿Control￿Valve

    S58￿Engine 7.￿Oil￿Supply Index Explanation Main￿oil￿duct￿from￿oil￿filter Return￿channel Piston￿cooling￿control￿valve Control￿channel Piston￿cooling￿relay￿valve Seal￿plug As￿a￿result￿of￿the￿controllable￿piston￿cooling￿used￿on￿the￿S58￿engine,￿the￿piston￿cooling￿can￿be selectively￿deactivated￿independently￿of￿engine￿oil￿pressure￿with￿the￿following￿benefits: • Lower￿drive￿power￿of￿the￿oil￿pump • Smaller￿dimensioning￿of￿the￿oil￿pump • Lower￿fuel￿consumption • Lower￿exhaust￿emissions 7.7.1.￿Relay￿valve￿control￿valve The￿valves￿have￿the￿task￿of￿selectively￿activating￿or￿deactivating￿the￿piston￿cooling￿and￿consist￿of￿the following￿two￿components: • Piston￿cooling￿control￿valve • Piston￿cooling￿relay￿valve Piston￿cooling￿control￿valve The￿piston￿cooling￿control￿valve￿is￿necessary￿in￿order￿to￿operate￿the￿piston￿cooling￿relay￿valve. Actuation￿is￿performed￿on￿demand￿by￿the￿DME￿control￿unit.
  • Page 61 S58￿Engine 7.￿Oil￿Supply S58￿engine,￿piston￿cooling￿control￿valve Index Explanation Compression￿spring Return￿channel￿to￿the￿crank￿space Control￿channel￿to￿piston￿cooling￿control￿valve Main￿oil￿duct￿from￿oil￿filter Oil￿strainer Valve￿seat Valve￿ball Sealing￿ring Solenoid￿coil Electrical￿connection The￿piston￿cooling￿control￿valve￿has￿the￿following￿two￿switching￿positions: • Piston￿cooling￿control￿valve￿de-energized: The￿force￿of￿the￿compression￿spring￿holds￿the￿piston￿cooling￿control￿valve￿closed. Return￿channel￿is￿connected￿to￿the￿control￿channel.
  • Page 62 S58￿Engine 7.￿Oil￿Supply • Piston￿cooling￿control￿valve￿energized￿by￿the￿DME￿control￿unit: Solenoid￿coil￿pulls￿against￿the￿spring￿force. Control￿channel￿is￿opened￿to￿the￿oil￿from￿the￿main￿oil￿duct. Return￿channel￿is￿closed￿by￿the￿valve￿ball. Piston￿cooling￿relay￿valve The￿piston￿cooling￿relay￿valve￿is￿a￿purely￿mechanical￿valve￿and￿has￿the￿task￿of￿activating￿or deactivating￿piston￿cooling. S58￿engine,￿piston￿cooling￿relay￿valve￿(central￿valve) Index Explanation Control￿channel￿from￿piston￿cooling￿control￿valve Oil￿duct￿to￿the￿oil￿spray￿nozzles Main￿oil￿duct￿from￿oil￿filter Sealing￿ring Piston Spring Mounting￿cap...
  • Page 63 S58￿Engine 7.￿Oil￿Supply The￿following￿operating￿condition￿opens￿the￿piston￿cooling￿relay￿valve￿and￿activates￿piston￿cooling: • Oil￿pressure￿from￿the￿main￿oil￿duct￿>￿1￿bar. Piston￿is￿moved￿against￿the￿spring￿force. Channel￿to￿the￿oil￿spray￿nozzles￿is￿opened￿and￿the￿pistons￿are￿cooled. Oil￿that￿is￿behind￿the￿piston￿can￿drain￿into￿the￿crank￿chamber￿via￿the￿control￿channel,￿the piston￿cooling￿control￿valve￿and￿the￿return￿channel. The￿following￿operating￿conditions￿prevent￿the￿piston￿cooling￿relay￿valve￿from￿opening￿and￿deactivate piston￿cooling: • Oil￿pressure￿from￿the￿main￿oil￿duct￿<￿1￿bar. Spring￿force￿is￿greater￿than￿the￿oil￿pressure￿from￿the￿main￿oil￿duct. Channel￿to￿the￿oil￿spray￿nozzles￿is￿not￿opened. • Piston￿cooling￿control￿valve￿energized. Oil￿is￿directed￿from￿the￿piston￿cooling￿control￿valve￿through￿the￿control￿channel￿to￿the space￿behind￿the￿pistons￿of￿the￿piston￿cooling￿relay￿valve. Oil￿pressure￿and￿spring￿force￿generate￿a￿back-pressure￿and￿seal￿off￿the￿piston￿cooling￿relay valve￿from￿the￿main￿oil￿duct. The￿channel￿to￿the￿oil￿spray￿nozzles￿can￿no￿longer￿be￿opened. Illustration￿of￿central￿valve￿functions S58￿engine,￿illustration￿of￿central￿valve￿function Index Explanation Piston￿cooling￿control￿valve￿de-energized,￿oil￿pressure￿in￿main￿oil￿duct￿>￿1 bar. Piston￿cooling￿active Piston￿cooling￿control￿valve￿de-energized,￿oil￿pressure￿in￿main￿oil￿duct￿<￿1 bar. Piston￿cooling￿deactivated Piston￿cooling￿control￿valve￿energized,￿oil￿pressure￿in￿main￿oil￿duct￿>￿1 bar. Piston￿cooling￿deactivated Oil￿pressure Depressurized...

  • Page 64: Oil￿Filter￿And￿Engine￿Oil￿Cooling

    S58￿Engine 7.￿Oil￿Supply Index Explanation Channel￿to￿the￿oil￿spray￿nozzles Main￿oil￿channel￿to￿piston￿cooling￿relay￿valve Main￿oil￿channel￿to￿piston￿cooling￿control￿valve Return￿channel Piston￿cooling￿control￿valve Control￿channel Piston￿cooling￿relay￿valve 7.8.￿Oil￿filter￿and￿engine￿oil￿cooling The￿oil￿filter￿housing￿is￿made￿from￿aluminium.￿For￿engine￿cooling,￿a￿discrete￿engine￿oil￿cooler￿is￿used which￿is￿fitted￿horizontally￿in￿front￿of￿the￿radiator￿module.￿Depending￿on￿the￿engine￿oil￿temperature,￿a thermostat￿at￿the￿oil￿filter￿housing￿enables￿the￿oil￿flow￿to￿the￿engine￿oil￿cooler. S58,￿engine￿oil￿cooling...

  • Page 65: Engine￿Oil￿Monitoring

    S58￿Engine 7.￿Oil￿Supply Index Explanation Engine￿oil￿cooler Engine￿oil￿pipe,￿return Thermostat Oil￿filter Engine￿oil￿pipe,￿supply The￿thermostat￿opens￿and￿closes￿under￿the￿following￿three￿operating￿conditions: • Engine￿oil￿temperature￿<￿100￿±2 °C￿(212￿±35￿°F):￿The￿entire￿oil￿flow￿is￿passes￿directly￿through the￿oil￿filter. • Engine￿oil￿temperature￿100￿±2 °C￿-￿114￿±2 °C￿(212￿±35￿°F￿-￿237￿±35￿°F￿):￿Part￿of￿the￿oil￿flow passes￿through￿the￿engine￿oil￿cooler￿and￿then￿through￿the￿oil￿filter,￿the￿rest￿passes￿directly through￿the￿oil￿filter. • Engine￿oil￿temperature￿>￿114￿±￿2 °C￿(237￿±35￿°F￿):￿The￿flow￿through￿the￿engine￿oil￿cooler￿is regulated￿in￿order￿to￿obtain￿the￿target￿engine￿oil￿temperature. 100 °C￿(212￿°F)￿is￿chosen￿as￿the￿initial￿opening￿temperature￿because￿then￿the￿condensation￿water￿in the￿oil￿evaporates￿through￿the￿crankcase￿ventilation￿system. 7.9.￿Engine￿oil￿monitoring 7.9.1.￿Oil￿pressure Because￿the￿S58￿engine￿has￿a￿data-map￿controlled￿oil￿pump,￿it￿is￿necessary￿to￿precisely￿register￿the oil￿pressure.￿For￿that￿reason,￿an￿oil￿pressure￿sensor￿is￿used. The￿advantages￿of￿the￿sensor￿are: • Measurement￿of￿the￿absolute￿pressure￿(previously￿used￿relative￿pressure) • Characteristic￿map￿control￿possible￿at￿every￿engine￿speed 7.9.2.￿Oil￿temperature The￿familiar￿oil￿temperature￿sensor￿from￿the￿N55￿engine￿is￿used￿to￿measure￿the￿oil￿temperature. 7.9.3.￿Oil￿level The￿familiar￿oil-level￿sensor,￿which￿simultaneously￿measures￿the￿temperature￿in￿the￿sump,￿is￿used￿to measure￿the￿oil￿level.

  • Page 66: Service￿Information

    S58￿Engine 7.￿Oil￿Supply 7.10.￿Service￿information At￿present,￿as￿with￿other￿BMW￿M￿models￿with￿S￿engines,￿an￿engine￿oil￿change￿at 2,000 km￿(1200￿mile)￿(running-in￿check)￿is￿provided￿for￿in￿the￿case￿of￿the￿S58￿engine. To￿ensure￿that￿the￿engine￿oil￿in￿the￿front,￿smaller￿sump￿is￿drained￿completely￿during￿an￿engine￿oil service,￿the￿upper￿section￿of￿the￿sump￿features￿a￿small￿drain￿hole￿through￿which￿the￿engine￿oil￿can flow￿to￿the￿rear￿sump. S58￿engine,￿drain￿hole Index Explanation Drain￿hole Front,￿smaller￿oil￿sump Rear￿oil￿sump The￿current￿engine￿oil￿recommendations￿and￿capacities￿can￿be￿a￿found￿in￿the￿current￿documentation of￿the￿BMW￿workshop￿information￿system￿or￿the￿vehicle￿Owner's￿Handbook.
  • Page 67 S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System 8.1.￿Air￿intake￿system 8.1.1.￿Overview For￿the￿S58￿engine￿the￿intake￿air￿system￿had￿to￿be￿completely￿realigned. • Air￿intake￿duct￿up￿to￿the￿intake￿silencer • Clean￿air￿duct￿due￿to￿new￿exhaust￿turbochargers￿completely￿new • Crankcase￿venting￿components • Indirect￿charge￿air￿cooling • Coolant-cooled￿electromotive￿throttle￿controller • Tank￿ventilation￿system￿adapted. As￿can￿be￿seen￿from￿the￿graphics,￿the￿design￿of￿the￿intake￿air￿system￿is￿more￿complex, as￿two￿turbochargers￿are￿fitted￿and￿indirect￿charge￿air￿cooling￿is￿employed. S58￿engine,￿intake￿air￿system...
  • Page 68 S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System Index Explanation Intake￿snorkel,￿right Unfiltered￿air￿pipe,￿right Clean￿air￿duct,￿cylinders￿1-3 Clean￿air￿duct,￿cylinders￿4-6 Exhaust￿turbocharger,￿cylinders￿4-6 Intake￿silencer Intake￿plenum￿with￿indirect￿charge￿air￿cooler Throttle￿valve Exhaust￿turbocharger,￿cylinders￿1-3 Y￿charge￿air￿pipe Unfiltered￿air￿pipe,￿left Intake￿snorkel,￿left Intake￿air￿temperature￿sensor Charging￿pressure￿sensor￿before￿throttle￿valve...
  • Page 69 S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System S58￿engine,￿intake￿air￿system￿from￿above Index Explanation Unfiltered￿air Clean￿air Heated￿charge￿air Cooled￿charge￿air Intake￿snorkel,￿right Unfiltered￿air￿pipe,￿right Clean￿air￿duct,￿cylinders￿1-3 Clean￿air￿duct,￿cylinders￿4-6 Air￿cleaner Exhaust￿turbocharger,￿cylinders￿4-6...

  • Page 70: Air￿Mass￿Determination

    S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System Index Explanation Exhaust￿turbocharger,￿cylinders￿1-3 Intake￿silencer￿cover Intake￿plenum Indirect￿charge￿air￿cooler Intake￿air￿temperature￿sensor Charging￿pressure￿sensor￿before￿throttle￿valve Unfiltered￿air￿pipe,￿left Intake￿snorkel,￿left 8.1.2.￿Air￿mass￿determination On￿the￿US￿and￿Europe￿versions,￿the￿intake￿air￿mass￿flow￿is￿not￿measured￿by￿a￿hot-film￿air￿mass￿meter but￿calculated￿by￿the￿DME.￿For￿this￿calculation,￿an￿experience-based￿filling￿calculation￿(filling￿model)￿is programmed￿in￿the￿DME.￿The￿following￿signals￿are￿applied￿to￿this￿calculation. Signals: • VANOS￿setting￿(load￿sensing) • Throttle￿valve￿position￿(throttling) • Intake￿air￿temperature￿(air￿density￿correction) • Engine￿temperature￿(air￿density￿correction) • Engine￿speed￿(cylinder￿charging) • Intake￿manifold￿differential￿pressure￿(throttling￿correction) • Ambient￿pressure￿(air￿density￿based￿on￿altitude￿correction). The￿air￿mass￿calculated￿in￿this￿way￿is￿adjusted￿and￿corrected￿if￿necessary￿in￿line￿with￿the￿oxygen sensor￿signals￿(air/fuel￿ratio)￿and￿the￿injection￿period￿(fuel￿quantity).￿Should￿the￿oxygen￿sensors￿fail,￿a fault￿memory￿entry￿is￿made￿in￿the￿DME￿(air￿mass￿plausibility).￿Adjustment￿to￿the￿calculated￿air￿mass does￿not￿apply￿in￿this￿case. The￿monitoring￿of￿the￿tank￿ventilation￿system￿for￿leaks￿that￿is￿legally￿required￿on￿the￿US￿is￿performed by￿the￿venturi￿nozzle￿pressure￿sensor￿on￿the￿S58￿engine.￿Therefore,￿it￿has￿been￿possible￿to￿dispense with￿the￿hot￿film￿air￿mass￿meter. 8.1.3.￿Tank￿ventilation￿system In￿a￿carbon￿canister￿the￿fuel￿vapors￿are￿stored￿temporarily￿and￿fed￿for￿combustion￿via￿the￿tank￿vent...
  • Page 71 S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System S58￿engine,￿tank￿ventilation￿system Index Explanation Connection￿before￿turbocharger Venturi￿nozzle￿pressure￿sensor Tank￿ventilation￿line Intake￿plenum￿connection Tank￿vent￿valve Connection￿to￿the￿tank￿ventilation￿line￿from￿the￿carbon￿canister Indirect￿charge￿air￿cooler Connection￿after￿throttle￿valve Throttle￿valve Venturi￿nozzle...

  • Page 72: Venturi￿Nozzle￿Pressure￿Sensor

    S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System 8.1.4.￿Venturi￿nozzle￿pressure￿sensor The￿flow￿of￿scavenging￿air￿is￿generated￿by￿the￿vacuum￿in￿the￿intake￿pipe.￿In￿order￿to￿be￿able￿to scavenge￿in￿turbocharged￿mode￿as￿well,￿vacuum￿is￿generated￿by￿means￿of￿a￿venturi￿nozzle.￿The venturi￿nozzle￿is￿powered￿by￿an￿air￿mass￿flow￿which￿is￿tapped￿downstream￿of￿the￿intercooler￿and￿fed back￿in￿upstream￿of￿the￿impeller.￿The￿venturi￿nozzle￿pressure￿sensor￿in￿the￿tank￿vent￿pipe￿is￿used￿to diagnose￿the￿second￿feed-in￿point￿of￿the￿tank￿ventilation￿system. Strain￿gauges￿are￿used￿to￿determine￿the￿pressure.￿A￿steel￿diaphragm￿in￿the￿sensor￿fitted￿with￿strain gauges￿is￿deformed￿by￿the￿pressure￿present.￿The￿changes￿in￿resistance￿of￿the￿strain￿gauges￿are electronically￿analyzed￿by￿a￿Wheatstone￿bridge.￿The￿voltage￿measured￿is￿then￿included￿in￿the￿tank ventilation￿diagnosis￿as￿an￿actual￿data￿reading.￿The￿venturi￿nozzle￿pressure￿sensor￿is￿a￿differential pressure￿sensor. 8.1.5.￿Carbon￿canister To￿meet￿emission￿standards￿in￿the￿US,￿a￿carbon￿canister￿with￿a￿larger￿volume￿is￿used.￿The￿basic function￿of￿the￿carbon￿canister￿has￿not￿changed.￿The￿increase￿in￿volume￿is￿solely￿for￿the￿purpose￿of collecting￿larger￿amounts￿of￿fuel￿vapor￿and￿retaining￿them￿for￿longer￿before￿a￿flushing￿operation￿by￿the tank￿vent￿valve￿takes￿place. 8.2.￿Exhaust￿emission￿system 8.2.1.￿Overview The￿exhaust￿emission￿system￿has￿a￿different￿structure￿in￿the￿S58￿engine￿with￿the￿two￿exhaust turbochargers￿than￿in￿the￿B58TU￿engine￿with￿a￿twin-scroll￿exhaust￿turbocharger.￿The￿exhaust￿system is￿a￿cylinder-dependent￿twin-pipe￿design. The￿exhaust￿system￿was￿designed￿for￿minimum￿exhaust￿gas￿pressure.￿With￿this￿dethrottling￿of￿the exhaust￿system,￿the￿efficiency￿of￿the￿gas￿exchange￿could￿be￿optimized￿even￿further.
  • Page 73 S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System S58￿engine,￿exhaust￿system Index Explanation Exhaust￿manifold,￿cylinders￿1-3 Exhaust￿turbocharger,￿cylinders￿4-6 Exhaust￿manifold,￿cylinders￿4-6 Catalytic￿converter,￿cylinders￿4-6 Exhaust￿turbocharger,￿cylinders￿1-3 Catalytic￿converter,￿cylinders￿1-3 Catalytic￿converter/particulate￿filter￿(Not￿for￿the￿US) Catalytic￿converter/particulate￿filter￿(Not￿for￿the￿US) Center￿silencer Rear￿silencer Exhaust￿tailpipes...

  • Page 74: Exhaust￿Manifold￿With￿Turbocharger

    S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System Overview￿of￿available￿exhaust￿systems￿on￿F97/F98￿with￿S58￿engine Standard￿exhaust￿system US￿version Upstream￿catalytic￿converter  Underbody￿catalytic￿converter  Front￿oxygen￿sensor  Monitoring￿oxygen￿sensor  Exhaust￿flap  Chrome-plated￿tailpipe￿trims  M￿Sport￿exhaust￿system Continuous￿exhaust￿flap  Black￿chrome-plated￿tailpipe￿trim  8.2.2.￿Exhaust￿manifold￿with￿turbocharger The￿exhaust￿manifold￿is￿designed￿in￿relation￿to￿the￿bank.￿One￿exhaust￿manifold￿is￿used￿for￿every￿bank. The￿condensing￿of￿the￿three￿exhaust￿ducts￿into￿a￿single￿exhaust￿duct￿results￿in￿an￿optimal￿inflow￿of the￿turbine￿of￿the￿exhaust￿turbocharger.￿The￿exhaust￿manifold￿is￿cast￿into￿one￿part￿together￿with￿the turbine￿housing￿of￿the￿exhaust￿turbocharger￿and￿is￿thus￿one￿component. S58￿engine,￿connection￿of￿exhaust￿turbocharger￿at￿the￿engine￿housing...

  • Page 75: Electrical￿Wastegate￿Valve￿Actuator

    S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System Index Explanation Exhaust￿manifold,￿cylinders￿4-6 Wastegate￿valve,￿control￿rod,￿cylinders￿4-6 Oil￿feed￿line Electrical￿wastegate￿valve￿actuator,￿cylinders￿4-6 Clean￿air￿feed,￿cylinders￿4-6 Exhaust￿manifold,￿cylinders￿1-3 Electrical￿wastegate￿valve￿actuator,￿cylinders￿1-3 Clean￿air￿feed,￿cylinders￿1-3 Connection￿for￿the￿charge￿air￿cooler,￿cylinders￿1-3 Coolant￿connections Oil￿return Wastegate￿valve,￿control￿rod,￿cylinders￿1-3 Connection￿for￿the￿exhaust￿system Connection￿for￿the￿charge￿air￿cooler,￿cylinders￿4-6 The￿S58￿engine￿has￿a￿twin-turbocharger￿system￿using￿mono-scroll￿turbochargers￿as￿also￿used￿on￿the S55￿engine.￿The￿system￿supplier￿for￿the￿mono-scroll￿turbocharger￿assembly￿on￿the￿S58￿engine￿is￿the MHI￿Group. 8.2.3.￿Electrical￿wastegate￿valve￿actuator The￿S58￿engine￿uses￿an￿electric￿wastegate￿controller.￿The￿function￿of￿the￿electric￿wastegate￿controller on￿the￿S58￿engine￿is￿the￿same￿as￿on￿the￿BMW￿AG￿engines. The￿fundamental￿advantages￿of￿the￿electric￿wastegate￿controller￿are: • High￿adjustment￿speed • Precise￿charging￿pressure￿control • High￿closing￿force,￿thus￿less￿leakage￿and￿quicker￿build-up￿of￿charging￿pressure • Complete￿opening￿of￿the￿wastegate￿valve￿possible.￿This￿supports￿quick￿heating￿up￿with￿a￿cold catalytic￿converter. • Thus￿lower￿exhaust￿emissions • Fuel￿economy The￿electric￿wastegate￿controller￿is￿controlled￿directly￿by￿the￿DME￿control￿unit￿using￿a￿pulse-width modulated￿(PWM)￿signal.

  • Page 76: Front￿Oxygen￿Sensor

    S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System S58￿engine,￿catalytic￿converter Index Explanation Oxygen￿sensor￿upstream￿of￿monolith￿catalytic￿converter,￿cylinders￿1-3 Monolith￿catalytic￿converter,￿cylinders￿1-3 Oxygen￿sensor￿downstream￿of￿monolith￿catalytic￿converter,￿cylinders￿1-3 Decoupling￿element Differential￿pressure￿sensor￿connection 8.2.5.￿Front￿oxygen￿sensor The￿oxygen￿sensor￿(LSU￿5.2)￿from￿Bosch￿is￿used￿as￿a￿control￿sensor￿before￿the￿catalytic￿converter. The￿function￿is￿comparable￿to￿the￿oxygen￿sensor￿(LSU￿AVD)￿and￿therefore￿is￿not￿described￿in￿detail here. The￿oxygen￿sensor￿before￿catalytic￿converter￿(LSU￿5.2)￿is￿characterized￿by￿the￿following￿advantages: • High￿signal￿running,￿especially￿in￿charged￿operation￿due￿to￿lower￿M￿dynamic￿pressure dependence • Increased￿durability￿thanks￿to￿reduced￿pump￿voltage • Increased￿accuracy...

  • Page 77: Monitoring￿Oxygen￿Sensor

    S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System • Rapid￿operating￿readiness￿<￿7￿s • Higher￿heater￿output￿at￿10￿W • Increased￿temperature￿compatibility • Improved￿system￿connector￿with￿better￿contact￿properties The￿LSU￿5.2￿has￿an￿extended￿measuring￿range.￿It￿is￿thus￿possible￿to￿measure￿precisely￿from￿oxygen sensor￿0.65￿and￿higher.￿The￿new￿oxygen￿sensor￿is￿operational￿earlier,￿meaning￿exact￿measured￿values are￿available￿after￿only￿7￿s. The￿measuring￿dynamics￿of￿the￿sensor￿is￿higher,￿whereby￿it￿is￿possible￿to￿determine￿the￿air/fuel￿ratio in￿each￿cylinder￿separately￿and￿thus￿also￿control￿it.￿As￿a￿result,￿a￿homogeneous￿exhaust￿flow￿can￿be adjusted,￿the￿emission￿levels￿lowered￿and￿the￿long-term￿emission￿behavior￿optimized. 8.2.6.￿Monitoring￿oxygen￿sensor The￿oxygen￿sensor￿after￿the￿catalytic￿converter￿is￿also￿called￿a￿monitoring￿sensor.￿The￿monitoring sensor￿LSF￿XFOUR￿from￿Bosch￿is￿used￿which￿is￿the￿successor￿sensor￿to￿the￿LSF￿4.2. The￿LSF￿Xfour￿needs￿the￿DME￿8.6.S￿for￿signal￿analysis￿and￿is￿distinguished￿by￿the￿following characteristics: • To￿achieve￿quicker￿response￿characteristics￿after￿engine￿start￿(half￿of￿the￿LSF￿4.2￿value), a￿stronger￿controlled￿heater￿has￿been￿integrated￿in￿the￿LSF￿Xfour. • This￿improves￿signal￿stability. • Less￿space￿is￿required￿for￿installation. • Thanks￿to￿the￿high￿temperature￿resistance￿and￿optimal￿thermoshock￿protection,￿the resistance￿to￿condensation￿in￿the￿exhaust￿tract￿following￿a￿cold￿start￿has￿been￿improved. Depending￿on￿the￿conditioning￿of￿the￿emission￿control￿systems,￿it￿may￿take￿around￿30￿seconds for￿the￿full￿power￿of￿the￿engine￿to￿be￿available￿after￿it￿is￿started.￿In￿that￿period,￿the￿DME￿control￿unit activates￿a￿substitute￿program￿that￿is￿required￿in￿order￿to￿quickly￿bring￿the￿emission￿control￿systems up￿to￿operating￿temperature.￿In￿that￿situation￿the￿full￿power￿of￿the￿engine￿is￿not￿available￿as￿normal.￿If necessary,￿the￿driver￿is￿notified￿of￿the￿situation￿by￿a￿CCM￿(check￿control￿message). 8.2.7.￿Rear￿silencer The￿rear￿silencer￿has￿the￿typical￿M￿chrome-plated￿exhaust￿tailpipe￿trims. The￿electrical￿exhaust￿flaps￿are￿activated￿directly￿by￿the￿DME￿by￿a￿pulse-width￿modulated￿signal.

  • Page 78: Electrically￿Controlled￿Exhaust￿Flaps

    S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System S58￿engine,￿electric￿exhaust￿flaps Index Explanation Exhaust￿pipe,￿left Exhaust￿pipe,￿right Rear￿silencer Electrical￿exhaust￿flap￿actuator￿(EAKS),￿right Twin￿tailpipe Electrical￿exhaust￿flap￿actuator￿(EAKS),￿left 8.2.8.￿Electrically￿controlled￿exhaust￿flaps The￿exhaust￿flaps￿are￿integrated￿in￿the￿rear￿silencer￿in￿the￿outer￿exhaust￿tailpipes.￿The￿exhaust￿flaps are￿operated￿by￿an￿axially￿aligned￿electric￿motor￿with￿integrated￿gears￿and￿electronics.￿The￿electric controller￿for￿the￿exhaust￿flaps￿has￿the￿following￿connections: • Voltage￿supply￿(+) • Ground￿(-) • Actuating￿wire￿(signal￿line) The￿exhaust￿flaps￿can￿be￿used￿influence￿the￿acoustics￿of￿the￿engine￿at￿low￿engine￿revs￿and￿low￿loads for￿reasons￿of￿comfort.￿In￿addition,￿the￿exhaust￿flap￿is￿intended￿to￿reduce￿the￿external￿noise￿levels￿in everyday￿urban￿use. At￿high￿engine￿speeds￿and￿high￿engine￿loads,￿the￿exhaust￿gas￿counterpressure￿can￿be￿reduced￿by opening￿the￿exhaust￿flap.

  • Page 79: M￿Sport￿Exhaust￿System

    S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System If￿the￿electric￿controller￿detects￿an￿internal￿fault,￿it￿notifies￿the￿DME￿control￿unit￿engine￿management. The￿exhaust￿flap￿cannot￿adopt￿an￿intermediate￿setting;￿it￿is￿either￿fully￿opened￿or￿closed.￿The￿flap￿is moved￿to￿the￿respective￿mechanical￿end￿stops￿by￿means￿of￿pulse-width￿modulated￿signals￿(PWM signals). Electrical￿exhaust￿flap S58B30T0￿engine Installation￿location right￿and￿left PWM￿signal￿open 10%￿duty￿cycle PWM￿signal￿closed 90%￿duty￿cycle The￿electrical￿controller￿of￿the￿exhaust￿flap￿can￿be￿replaced￿separately.￿The￿controller￿can￿be￿moved into￿an￿installation￿position￿using￿the￿BMW￿diagnosis￿system￿ISTA. The￿exhaust￿flaps￿are￿operated￿on￿a￿demand-oriented￿basis￿and￿can￿be￿influenced￿by￿setting￿the engine￿dynamics￿control￿buttons￿to￿“Efficient”,￿“Sport”￿or￿“Sport+”. Apart￿from￿the￿engine￿dynamics￿control￿buttons,￿the￿position￿of￿the￿exhaust￿flaps￿can￿also￿be influenced￿by￿the￿sound￿button￿in￿the￿center￿console￿switch￿cluster. In￿default￿mode￿the￿button￿is￿deactivated￿and￿the￿acoustic￿characteristics￿linked￿to￿the￿modes.￿If￿the Sound￿button￿is￿pressed￿then￿the￿vehicle￿interior￿acoustics￿are￿trimmed￿to￿the￿maximum￿comfort setting.￿That￿is￿independent￿of￿the￿selected￿driving￿mode￿–￿in￿other￿words￿the￿Sound￿button￿overrides other￿acoustics￿settings. Thus,￿in￿order￿to￿obtain￿maximum￿comfort￿(quietness)￿when￿the￿Sound￿button￿is￿active,￿the￿exhaust flap￿is￿kept￿closed￿for￿as￿long￿as￿possible.￿Therefore,￿it￿no￿longer￿opens￿when￿the￿driver￿calls￿for￿more power￿but￿instead￿in￿response￿to￿the￿exhaust￿mass￿flow￿rate.￿It￿remains￿closed￿as￿long￿as￿it￿does￿not affect￿performance￿and￿fuel￿consumption￿or￿until￿the￿perceived￿noise￿level￿in￿the￿vehicle￿interior￿is more￿comfortable. Activation￿of￿the￿Sound￿button￿also￿reduces￿all￿other￿activities￿that￿have￿an￿effect￿on￿the￿interior acoustics￿(ASD). If￿the￿vehicle￿has￿not￿entered￿sleep￿mode,￿i.e.￿is￿started￿up￿again￿after￿being￿parked￿for￿a￿short￿period, the￿settings￿are￿retained.￿The￿same￿applies￿to￿the￿Auto￿Start/Stop￿function. Due￿to￿the￿internal￿interconnection￿of￿the￿exhaust￿tailpipes,￿the￿exhaust￿always￿flows￿through￿both pairs￿of￿tailpipes￿regardless￿of￿the￿flap￿setting. The￿sound￿button￿is￿connected￿with￿the￿Body￿Domain￿Controller￿(BDC)￿via￿a￿LIN￿bus. 8.2.9.￿M￿Sport￿exhaust￿system The￿M￿Sport￿exhaust￿system￿SA￿1MA￿comes￿as￿standard￿with￿Competition￿package￿SA￿7MN￿on￿the F97/F98.)
  • Page 80 S58￿Engine 8.￿Intake￿Air￿and￿Exhaust￿System The￿design￿of￿the￿sports￿exhaust￿system￿only￿differs￿from￿the￿standard￿production￿exhaust￿system￿by virtue￿of￿the￿internal￿design￿of￿the￿rear￿silencer.￿That￿design￿feature￿in￿the￿area￿of￿the￿rear￿silencer￿and the￿controlled￿exhaust￿flaps￿has￿made￿it￿possible￿to￿give￿the￿F97/F98￿with￿M￿Sport￿exhaust￿system￿an even￿more￿distinctly￿powerful,￿richer￿and￿more￿emotive￿sound￿than￿the￿standard￿production￿exhaust system. S58￿engine,￿M￿Sport￿exhaust￿system Index Explanation Exhaust￿pipe,￿left Exhaust￿pipe,￿right Electrical￿exhaust￿flap￿actuator￿(EAKS),￿right Rear￿silencer Twin￿tailpipe Electrical￿exhaust￿flap￿actuator￿(EAKS),￿left In￿contrast￿with￿the￿exhaust￿flaps￿on￿the￿standard￿exhaust￿system,￿the￿exhaust￿flaps￿of￿the￿M￿Sport exhaust￿system￿can￿adopt￿intermediate￿positions.￿Therefore,￿it￿is￿possible￿for￿the￿exhaust￿flaps￿to be￿continuously￿variably￿adjusted￿to￿any￿position.￿On￿vehicles￿with￿the￿M￿Sport￿exhaust￿system,￿the exhaust￿flap￿is￿fully￿open￿in￿Sport￿mode. The￿sports￿exhaust￿system￿of￿the￿F97/F98￿features￿black￿chrome-plated￿tailpipe￿trims￿as￿a￿visual identification￿feature. A￿further,￿more￿emotive￿adaptation￿of￿the￿interior￿sound￿in￿the￿F97/F98￿with￿M￿Sport￿exhaust￿system￿is made￿possible￿by￿a￿different￿Active￿Sound￿Design￿(ASD)￿tuning.
  • Page 81 S58￿Engine 9.￿Vacuum￿System 9.1.￿Design The￿S58￿engine￿has￿a￿vacuum￿pump￿for￿generating￿the￿necessary￿vacuum￿for￿the￿brake￿booster. S58￿engine,￿vacuum￿system Index Explanation Vacuum￿pump Non-return￿valve Non-return￿valve Brake￿booster 9.1.1.￿Vacuum￿pump The￿vacuum￿pump￿is￿attached￿to￿the￿oil￿pump.￿The￿vacuum￿pump￿is￿only￿required￿for￿supplying￿the brake￿booster.
  • Page 82 S58￿Engine 9.￿Vacuum￿System S58￿engine,￿vacuum￿pump Index Explanation Screw￿connection Diaphragm￿valve Vacuum￿pump Sealing￿plate...
  • Page 83 S58￿Engine 10.￿Fuel￿Preparation 10.1.￿Overview The￿following￿overview￿shows￿the￿entire￿fuel￿preparation.￿The￿fuel￿preparation￿of￿the￿S58￿engine￿is closely￿related￿to￿the￿fuel￿preparation￿of￿the￿B58TU￿engine.￿As￿distinct￿from￿the￿B58TU￿engine,￿the S58￿engine￿uses￿twin￿high-pressure￿pumps.￿This￿is￿necessary￿in￿order￿to￿provide￿the￿higher￿fuel￿level in￿the￿rail￿to￿achieve￿the￿required￿performance￿data￿and￿engine￿speeds￿of￿the￿S58￿engine. S58￿engine,￿high-pressure￿injection￿in￿the￿overview Index Explanation High￿pressure￿line￿for￿injectors High￿pressure￿pump￿1 Volume￿control￿valve￿1 High￿pressure￿pump￿2 Volume￿control￿valve￿2 Rail Fuel￿feed￿line...
  • Page 84 S58￿Engine 10.￿Fuel￿Preparation Index Explanation Fuel￿pressure￿sensor Holding￿clamp Solenoid￿valve￿injector Rail￿pressure￿sensor 10.2.￿Low-pressure￿fuel￿system The￿F97/F98￿with￿S58￿engine￿is￿fitted￿with￿a￿65-liter￿fuel￿tank. The￿fuel￿is￿delivered￿from￿the￿fuel￿tank￿through￿the￿electric￿fuel￿pump￿via￿the￿feed￿line￿at￿a￿primary pressure￿of￿5￿bar￿to￿the￿high￿pressure￿pumps.￿The￿fuel￿is￿conveyed￿from￿the￿electric￿fuel￿pump￿as required. To￿monitor￿the￿fuel￿pressure,￿a￿fuel￿low-pressure￿sensor￿is￿used￿that￿measures￿and￿monitors￿the￿fuel pressure￿on￿the￿low-pressure￿side.￿The￿fuel￿low-pressure￿sensor￿is￿connected￿to￿and￿monitored￿by￿the DME. In￿the￿event￿of￿a￿failure￿of￿the￿fuel￿pressure￿sensor￿the￿electric￿fuel￿pump￿continues￿to￿operate￿at￿100% delivery￿rate￿with￿terminal￿15￿ON. 10.3.￿High-pressure￿fuel￿system For￿the￿S58￿engine,￿the￿high-pressure￿injection￿HDE￿6￿is￿used. Changes￿were￿made￿in￿regard￿to￿the￿fuel￿injection￿pressure,￿which￿can￿now￿range￿up￿to￿350￿bar. Increasing￿the￿fuel￿injection￿pressure￿from￿200￿bar￿to￿350￿bar￿results￿in￿the￿following￿advantages: • Improved￿fuel￿atomization • More￿efficient￿delivery • Reduced￿fuel￿wall￿film￿formation • Shorter￿injection￿periods These￿advantages￿due￿to￿the￿fuel￿injection￿pressure￿increase￿to￿350￿bar￿led￿to￿the￿following improvements: • Reduction￿in￿particle￿emissions • Improved￿engine￿response￿under￿high￿engine￿load • Improved￿engine￿response￿under￿M￿dynamic￿engine￿operation Bosch￿high-pressure￿fuel￿injection￿valves￿with￿the￿designation￿HDEV￿6￿with￿CVO￿are￿used.￿Due￿to the￿fuel￿system￿pressure￿increase￿from￿200 bar￿to￿350 bar,￿the￿solenoid￿valve￿injectors￿HEDV6￿were...
  • Page 85 S58￿Engine 10.￿Fuel￿Preparation The￿S58￿engine￿has￿two￿high-pressure￿pumps￿connected￿in￿parallel.￿The￿two￿high-pressure￿pumps are￿operated￿in￿alternation￿every￿30￿seconds.￿That￿ensures￿that￿both￿high-pressure￿pumps￿are￿evenly loaded￿when￿the￿vehicle￿is￿being￿driven￿moderately.￿When￿the￿vehicle￿is￿being￿driven￿harder￿or￿at full￿power,￿both￿high-pressure￿pumps￿are￿operated￿simultaneously.￿This￿was￿necessary￿in￿order￿to satisfy￿the￿higher￿throughput￿volume￿of￿fuel￿at￿high￿engine￿speeds.￿Control￿is￿effected￿by￿means￿of￿the volume￿control￿valve￿of￿the￿high-pressure￿pumps￿using￿a￿PWM￿signal. The￿piston￿and￿tappet￿of￿the￿high-pressure￿pump￿have￿been￿modified￿and￿materials￿adapted￿but￿its general￿design￿is￿familiar￿from￿the￿previous￿3,￿4,￿6￿and￿8-cylinder￿engines.￿The￿triple￿cams￿on￿the￿high- pressure￿pump￿drive￿mechanisms￿for￿each￿pump￿have￿an￿interval￿of￿120°￿in￿each￿case.￿The￿two￿drive cam￿pairs,￿which￿drive￿the￿two￿high-pressure￿pumps,￿are￿arranged￿so￿that￿there￿is￿a￿delivery￿every￿60°. Work￿on￿the￿fuel￿system￿is￿only￿permitted￿after￿the￿engine￿has￿cooled￿down.￿The￿coolant￿temperature must￿not￿exceed￿40￿°C.￿This￿stipulation￿must￿be￿observed￿without￿fail,￿as￿otherwise￿there￿is￿a￿risk￿of fuel￿being￿sprayed￿back￿on￿account￿of￿the￿residual￿pressure￿in￿the￿high-pressure￿fuel￿system. When￿working￿on￿the￿high-pressure￿fuel￿system,￿it￿is￿essential￿to￿adhere￿to￿conditions￿of￿absolute cleanliness￿and￿to￿observe￿the￿work￿sequences￿described￿in￿the￿repair￿instructions.￿Even￿the￿slightest contamination￿and￿damage￿to￿the￿screwed￿fittings￿of￿the￿high-pressure￿lines￿can￿cause￿leaks. When￿working￿on￿the￿fuel￿system￿of￿the￿S58￿engine,￿it￿is￿important￿to￿ensure￿that￿the￿ignition￿coils￿are not￿fouled￿with￿fuel.￿The￿resistance￿of￿the￿silicone￿material￿is￿greatly￿reduced￿by￿sustained￿contact with￿fuel.￿This￿may￿result￿in￿flashovers￿on￿the￿spark￿plug￿head￿and￿thus￿in￿misfires. • Before￿making￿any￿modifications￿to￿the￿fuel￿system,￿without￿fail￿remove￿the￿ignition￿coils￿and protect￿the￿spark￿plug￿shaft￿against￿ingress￿of￿fuel￿by￿covering￿with￿a￿cloth. • Prior￿to￿a￿new￿installation￿of￿the￿solenoid￿valve￿injectors,￿the￿ignition￿coils￿must￿be disassembled￿and￿the￿highest￿possible￿level￿of￿hygiene￿ensured. • Ignition￿coils￿heavily￿fouled￿by￿fuel￿must￿be￿replaced. • The￿CVO￿function￿comprises￿the￿"injector"￿and￿"digital￿engine￿electronics"￿(DME)￿system components.￿These￿components￿therefore￿have￿to￿be￿identified￿with￿the￿vehicle￿identification number￿in￿the￿EPC￿in￿the￿event￿of￿a￿replacement. • Where￿injectors￿and￿DME￿support￿the￿CVO￿function,￿the￿injection￿quantity￿compensation during￿the￿replacement￿of￿one￿of￿the￿components￿is￿omitted. • An￿excessive￿rotational￿angle￿at￿the￿injector￿shank,￿and￿excessive￿tensile￿and￿compressive forces￿during￿removal￿and￿installation￿can￿lead￿to￿damage￿and￿therefore￿leaks￿in￿the￿fuel system.
  • Page 86 S58￿Engine 11.￿Cooling￿System 11.1.￿Overview The￿cooling￿system￿of￿the￿S58￿engine￿consists￿of￿an￿engine￿and￿charge￿air￿cooling￿system￿plus￿an￿oil cooling￿system￿for￿the￿engine￿oil￿and￿the￿M￿automatic￿transmission. S58￿engine,￿cooling￿systems Index Explanation Engine￿oil￿cooler Transmission￿oil￿cooler Upstream￿low-temperature￿radiator,￿charge￿air Low-temperature￿cooler,￿charge￿air Radiator,￿engine Coolant￿expansion￿tank,￿charge￿air...
  • Page 87 S58￿Engine 11.￿Cooling￿System Index Explanation Indirect￿charge￿air￿cooler Coolant￿expansion￿tank,￿engine Thermostat￿for￿transmission￿oil￿cooling Auxiliary￿radiator,￿engine S58￿engine,￿engine￿cooling￿with￿exhaust￿turbocharger￿and￿charge￿air￿cooling Index Explanation Low-temperature￿cooler,￿charge￿air Upstream￿low-temperature￿radiator,￿charge￿air Radiator,￿engine Electric￿coolant￿pump,￿low-temperature￿circuit,￿charge￿air Coolant￿expansion￿tank,￿charge￿air...
  • Page 88 S58￿Engine 11.￿Cooling￿System Index Explanation Indirect￿charge￿air￿cooler Thermostat Mechanical￿coolant￿pump,￿engine Electric￿coolant￿pump￿for￿exhaust￿turbocharger Exhaust￿turbocharger Coolant￿temperature￿sensor Heater￿matrix￿for￿vehicle￿interior￿heating Electric￿coolant￿pump,￿heating￿for￿passenger￿compartment Throttle￿valve Coolant￿expansion￿tank,￿engine Electric￿fan Auxiliary￿radiator,￿engine...
  • Page 89 S58￿Engine 11.￿Cooling￿System 11.2.￿Engine￿cooling S58￿engine,￿cooling￿system Index Explanation Radiator,￿engine Thermostat Mechanical￿coolant￿pump,￿engine Electric￿coolant￿pump￿for￿exhaust￿turbocharger Exhaust￿turbocharger Coolant￿temperature￿sensor Heat￿exchanger￿for￿heating￿system Electric￿coolant￿pump,￿heating￿for￿passenger￿compartment...
  • Page 90 S58￿Engine 11.￿Cooling￿System Index Explanation Throttle￿valve Coolant￿expansion￿tank,￿engine Electric￿fan Auxiliary￿radiator,￿engine The￿following￿graphic￿shows￿the￿connection￿of￿the￿additional￿radiator￿at￿the￿cooling￿system.￿The additional￿radiator￿is￿connected￿with￿coolant￿lines￿at￿the￿radiator￿in￿parallel,￿whereby￿the￿cooling￿area increases. S58￿engine,￿coolant￿circuit￿with￿exhaust￿turbocharger Index Explanation Radiator,￿engine Mechanical￿coolant￿pump,￿engine Thermostat Electric￿coolant￿pump￿for￿exhaust￿turbocharger Turbocharger￿units...
  • Page 91 S58￿Engine 11.￿Cooling￿System Index Explanation Heat￿exchanger￿for￿heating￿system Electric￿coolant￿pump,￿heating￿for￿passenger￿compartment Throttle￿valve Auxiliary￿radiator,￿engine Coolant￿expansion￿tank,￿engine The￿thermostat￿used￿is￿a￿data-map￿thermostat￿which￿can￿be￿controlled￿by￿the￿DME.￿The￿thermostat starts￿opening￿at￿a￿coolant￿temperature￿of￿101 °C￿(214￿°F).￿The￿thermostat￿is￿fully￿open￿at￿a￿coolant temperature￿of￿120 °C￿(248￿°F). 11.2.1.￿Cooling￿circuit,￿exhaust￿turbocharger S58￿engine,￿cooling￿circuit￿of￿the￿exhaust￿turbocharger￿with￿electrical￿auxiliary￿coolant￿pump...
  • Page 92 S58￿Engine 11.￿Cooling￿System Index Explanation Electric￿coolant￿pump￿for￿exhaust￿turbocharger Exhaust￿turbocharger The￿electric￿coolant￿pump￿for￿the￿turbochargers￿is￿a￿20 W￿pump￿which￿communicates￿with￿the DME￿via￿a￿LIN￿bus.￿The￿conventional￿coolant￿pump￿is￿driven￿via￿the￿drive￿belt￿and￿cannot￿be￿used for￿cooling￿the￿exhaust￿turbocharger￿after￿the￿engine￿has￿shut￿down.￿This￿is￿why￿there￿is￿an￿electric coolant￿pump￿for￿this￿separate￿cooling￿circuit.￿But￿also￿during￿engine￿operation￿the￿electric￿coolant pump￿is￿switched￿on￿taking￿into￿account￿the￿following￿factors: • Coolant￿temperature￿at￿the￿engine￿outlet • Engine￿oil￿temperature • Injected￿fuel￿quantity Using￿these￿values￿the￿heat￿input￿into￿the￿engine￿is￿calculated.￿The￿run-on￿period￿of￿the￿electric coolant￿pump￿can￿last￿up￿to￿30 min.￿To￿improve￿the￿cooling￿effect,￿the￿electric￿fan￿also￿cuts￿in￿and￿may run￿on￿for￿up￿to￿11 min. 11.2.2.￿Charge￿air￿cooling In￿the￿S58￿engine,￿like￿in￿the￿B58TU￿engine,￿so-called￿"indirect"￿charge￿air￿cooling￿is￿used.￿During the￿indirect￿charge￿air￿cooling￿the￿charge￿air￿is￿cooled￿via￿a￿low-temperature￿cooling￿circuit.￿The￿low- temperature￿coolant￿circuit￿is￿then￿cooled￿again￿by￿the￿atmospheric￿airflow￿induced￿by￿vehicle￿motion acting￿on￿two￿water-to-air￿heat￿exchangers.
  • Page 93 S58￿Engine 11.￿Cooling￿System S58￿engine,￿charge￿air￿cooling Index Explanation Low-temperature￿coolant￿radiator,￿charge￿air Upstream￿low-temperature￿radiator,￿charge￿air Electric￿coolant￿pump,￿low-temperature￿circuit,￿charge￿air Coolant￿expansion￿tank,￿charge￿air Indirect￿charge￿air￿cooler The￿capacity￿of￿the￿charge￿air￿cooling￿circuit￿is￿approx.￿4 liters.￿The￿coolant￿in￿the￿charge￿air￿cooling system￿is￿circulated￿by￿a￿130 W￿electric￿coolant￿pump￿which￿communicates￿with￿the￿DME￿via￿a￿LIN bus.￿The￿two￿water-to-air￿heat￿exchangers￿are￿connected￿in￿parallel￿and￿are￿supplied￿via￿an￿expansion tank,￿which￿is￿attached￿to￿the￿vehicle.￿The￿indirect￿charge￿air￿cooler￿has￿a￿cooling￿power￿of￿36￿kW.
  • Page 94 S58￿Engine 11.￿Cooling￿System S58￿engine,￿cooling￿circuit,￿charge￿air Index Explanation Low-temperature￿coolant￿radiator,￿charge￿air Upstream￿low-temperature￿radiator,￿charge￿air Coolant￿expansion￿tank,￿charge￿air Indirect￿charge￿air￿cooler Electric￿coolant￿pump,￿low-temperature￿circuit,￿charge￿air...
  • Page 95 S58￿Engine 12.￿Engine￿Electrical￿System 12.1.￿Engine￿control￿unit A￿new￿generation￿of￿Bosch￿engine￿control￿units￿is￿used￿in￿the￿S58￿engine.￿8th-generation￿engine electronics￿(DME)￿features￿a￿common￿control￿unit￿platform￿for￿petrol￿and￿diesel￿engines￿that￿is￿already used￿with￿modular￿engines.￿Its￿appearance￿is￿characterized￿by￿a￿uniform￿housing￿and￿a￿uniform connector￿strip.￿However,￿the￿hardware￿inside￿has￿been￿adapted￿to￿the￿various￿applications. The￿control￿unit￿code￿(DME￿8.6.S)￿can￿be￿deciphered￿as￿follows: Abbreviation Meaning Digital￿Motor￿Electronics Control￿unit￿generation￿(modular￿operating￿system￿for￿petrol￿and￿diesel￿engine) Number￿of￿cylinders￿as￿hexadecimal￿figure M￿Sport￿engine￿management Number￿of￿cylinders￿as￿a￿hexadecimal￿figure: • 3￿=￿3-cylinder￿engine • 4￿=￿4-cylinder￿engine • 6￿=￿6-cylinder￿engine • S￿=￿8-cylinder￿engine • C￿=￿12-cylinder￿engine Hardware￿variant: • S￿=￿M￿Sport￿engine￿management Examples￿for￿petrol￿engines: • DME￿8.4.0H￿=￿B48￿PHEV ￿(variant￿electrical￿system￿1) • DME￿8.6.1￿=￿B58￿(￿electrical￿system￿2￿variant) • DME￿8.6.S￿=￿S58￿(electrical￿system￿2￿variant)
  • Page 96 S58￿Engine 12.￿Engine￿Electrical￿System 12.1.1.￿DME￿control￿unit S58￿engine,￿DME￿8.6.S...
  • Page 97 S58￿Engine 12.￿Engine￿Electrical￿System Index Explanation DME￿8.6.S Ambient￿pressure￿sensor Temperature￿sensor FlexRay PT-CAN PT‐CAN2 Natural￿Vacuum￿Leak￿Detection￿(NVLD) Body￿Domain￿Controller￿(BDC) Power￿distribution￿box￿(symbolic) Fuel￿Pump￿Control￿(FPC) Relay￿for￿electric￿fan Electric￿fan Blow-by￿heater Map-controlled￿valve,￿oil￿pump Data-map￿thermostat Tank￿vent￿valve VANOS￿solenoid￿valve,￿intake￿camshaft VANOS￿solenoid￿valve,￿exhaust￿camshaft Electric￿coolant￿pump,￿exhaust￿turbocharger Piston￿cooling￿control￿valve Electrical￿exhaust￿flap￿controller￿(EAKS) Volume￿control￿valve,￿high￿pressure￿pump￿1 Electrical￿exhaust￿flap￿controller￿(EAKS) Volume￿control￿valve,￿high￿pressure￿pump￿2 25-30 Injectors 31-36 Ignition￿coils Earth Electric￿wastegate￿valve￿controller Electric￿wastegate￿valve￿controller Oxygen￿sensor￿LSF￿Xfour Oxygen￿sensor￿LSF￿Xfour Oxygen￿sensor￿LSU￿5.2 Oxygen￿sensor￿LSU￿5.2 Diagnostic￿connector...
  • Page 98 S58￿Engine 12.￿Engine￿Electrical￿System Index Explanation Rail￿pressure￿sensor Charge￿air￿temperature￿and￿intake-manifold￿pressure￿sensor￿after￿throttle valve Knock￿sensors￿cylinder￿1-3 Knock￿sensors￿cylinder￿4-6 Venturi￿nozzle￿pressure￿sensor Fuel￿pressure￿sensor Camshaft￿sensor,￿intake￿camshaft Camshaft￿sensor,￿exhaust￿camshaft Crankshaft￿sensor Accelerator￿pedal￿module Throttle￿valve Oil￿pressure￿sensor Coolant￿temperature￿sensor Oil￿temperature￿sensor Intake￿air￿temperature￿sensor Differential￿pressure￿sensor,￿petrol￿particulate￿filter￿(Not￿for￿the￿US) Differential￿pressure￿sensor,￿petrol￿particulate￿filter￿(Not￿for￿the￿US) Valvetronic￿servomotor Oil-level￿sensor Electric￿coolant￿pump,￿charge￿air￿cooler Alternator Do￿not￿attempt￿any￿trial￿replacement￿of￿control￿units. Because￿of￿the￿electronic￿immobilizer,￿a￿trial￿replacement￿of￿control￿units￿from￿other￿vehicles￿must￿not be￿attempted￿under￿any￿circumstances. The￿connector￿concept￿is￿identical￿to￿that￿on￿the￿modular￿engines￿and￿features￿a￿Nano￿MQS connector￿system￿(Micro￿Quadlock￿System).￿There￿is￿a￿logical￿division￿into￿6￿modules. Measurements￿on￿the￿wiring￿harness￿may￿only￿be￿taken￿using￿measuring￿procedures￿approved￿by BMW.￿Use￿of￿the￿incorrect￿tools,￿such￿as￿measuring￿probes,￿can￿damage￿the￿plug-in￿contacts.
  • Page 99 S58￿Engine 12.￿Engine￿Electrical￿System S58￿engine,￿DME￿8.6.S￿connections Index Explanation DME￿8.6.S Module￿600,￿injection￿and￿ignition Module￿500,￿DME￿supply Module￿400,￿Valvetronic￿servomotor Module￿300,￿sensors￿and￿actuators￿2 Module￿200,￿sensors￿and￿actuators￿1 Module￿100,￿vehicle￿connection 12.1.2.￿Overall￿function The￿Digital￿Engine￿Electronics￿(DME)￿is￿the￿computing￿and￿switching￿center￿of￿the￿engine￿control system.￿Sensors￿on￿the￿engine￿and￿on￿the￿vehicle￿deliver￿the￿input￿signals.￿The￿signals￿for￿activating the￿actuators￿are￿calculated￿from￿the￿input￿signals,￿the￿setpoint￿values￿calculated￿using￿a￿computing model￿in￿the￿DME￿control￿unit￿and￿the￿stored￿characteristic￿maps.￿The￿DME￿control￿unit￿activates￿the actuators￿directly￿or￿via￿relays. The￿PT-CAN￿wakes￿up￿the￿DME￿control￿unit. The￿after-run￿begins￿once￿the￿terminal￿is￿switched￿to￿OFF.￿The￿adaptation￿values￿are￿stored￿during￿the after-run.￿The￿DME￿control￿unit￿uses￿a￿bus￿signal￿to￿signal￿its￿readiness￿to￿"go￿to￿sleep".￿When￿all￿the participating￿control￿units￿have￿signalled￿their￿readiness￿to￿"go￿to￿sleep",￿the￿bus￿master￿outputs￿a￿bus signal￿and￿the￿control￿units￿terminate￿communication￿5￿seconds￿later.
  • Page 100 S58￿Engine 12.￿Engine￿Electrical￿System The￿printed￿circuit￿board￿in￿the￿DME￿control￿unit￿accommodates￿two￿sensors:￿a￿temperature￿sensor and￿an￿ambient￿pressure￿sensor.￿The￿temperature￿sensor￿is￿used￿to￿monitor￿the￿temperature￿of￿the components￿in￿the￿DME￿control￿unit.￿The￿ambient￿pressure￿is￿required￿for￿calculating￿the￿mixture composition.

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