Autronica SM4 Manual
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Autronica SM4 Manual

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Summary of Contents for Autronica SM4

  • Page 2: Table Of Contents

    SM4 Manual by MRM-Racing V3.0 ABLE OF ONTENTS   INSTALLATION AND WIRING GUIDE..........................8   ....................................8 NTRODUCTION   ..................................8 EFORE YOU EGIN   ..........................9 OOLS AND ATERIAL THAT YOU WILL NEED   INSTALLATION GUIDE ................................10   ........................10 LYING NSTALLATION ON ENGINE  ...
  • Page 3 SM4 Manual by MRM-Racing V3.0   Boost setpoint table................................43   Boost dynamic compensation table .............................45   Boost offset table .................................45   Modified Boost offset table ..............................46   Boost modifier table................................48   Boost modifier table with protection at high intake air temperatures..................49  ...
  • Page 4 SM4 Manual by MRM-Racing V3.0   Lines 1..4......................................61   Insert overlay ....................................... 61   Statistics ....................................... 61   Mark block ......................................62   Next/ Prev tab ...................................... 62   Print page ......................................62   Print all......................................... 62   Edit-Window Monitor – Virtual dash ..........................62  ...
  • Page 5 SM4 Manual by MRM-Racing V3.0   Accel recovery time ..................................... 89   Decel enlenment mult ..................................90   Ign adv attack rate ....................................90   Ign adv decay rate ....................................90   Decel TPS dashpot ....................................90   Ign time const....................................... 90  ...
  • Page 6 SM4 Manual by MRM-Racing V3.0   PC logger Control ....................................110   PC Error history ....................................110   PC Logger setup....................................110   PC Logger control....................................110   PC logger reset ....................................111   PC logger graph ....................................111  ...
  • Page 7 SM4 Manual by MRM-Racing V3.0   BOOST CONTROL DIAGRAMS............................134   ................................134 NTERNAL ASTEGATE   ................................135 XTERNAL ASTEGATE   MAIN WIRING DIAGRAM – ALTERNATIVE........................136   MAIN WIRING DIAGRAM ..............................137...

  • Page 8: Installation And Wiring Guide

    Precise ignition and mixture control also leads to excellent drivability and fuel economy - something that is often lacking in high-performance carburettor engines. This Installation and Wiring Guide Will guide you trough installation of you Autronic SM4 onto you vehicle. This section accompanies the Setup Guide and Tuning Guide that you or your tuner will need to refer to before completing you installation and configuration.

  • Page 9: Tools And Material That You Will Need

    ECU. Tools and Material that you will need Installation of this SM4 system can be easily carried out by professional mechanics and most experienced home mechanics if the following tools and components are available: •...

  • Page 10: Installation Guide

    Sensor and device pin outs. Flying Lead Loom Installation on engine The following list outlines the procedure for installing the SM4 ECU with the flying lead harness: 1. Unpack your ECU and identify the following components, some components may vary if ordered a specific kit.
  • Page 11 They can be of a dumb type which uses dwell control from SM4 or smart types which use a pulse output, like the CDI. The output sequence is different from SMC/SM2 when used on multi coil setup.
  • Page 12 SM4 Manual by MRM-Racing V3.0 d. Connect idle speed engine if used; See wiring at end of manual. e. Connect any other auxiliary outputs like thermo fans, error light, shift light, anti-lag , boost control valves and more. 6. Power and Ground: a.

  • Page 13: Sensor And Device Pin Outs

    Make sure the point of connection will not cause fuel to get into the hose and run down into the map sensor. The SM4 can use a separate MAP sensor connected to analog 2-3 input (pin 38). Note If setup as BARO&TPS, the internal map sensor should be unconnected.

  • Page 14: Inlet Air Temperature Sensor

    SM4 Manual by MRM-Racing V3.0 Air cooled engines this should be mounted so that it is reading the engine oil temperature. As the temperature of the oil is higher then the water in a water cooled engine, the “Limp home temperature” in the software must be set to 200 degrees.

  • Page 15: Throttle Position Sensor

    SM4 Manual by MRM-Racing V3.0 Throttle Position Sensor The throttle position sensor (TPS) should be mounted directly on the main throttle, shaft or alternately connected to this shaft a rigid lash free linkage. Either a linear or rotary type potentiometer sensor may be used. Its electrical resistance should be in the range 2000 to 20,000 OHMS.

  • Page 16: Throttle Range Learning

    ECU to a computer with Autronic software. The SM4 do not use same output sequence as SMC/SM2, the SM4 always start with output number 1, after that in number order if more than one ignition output is used.

  • Page 17: Exhaust Gas Sensor (Optional)

    You can also weld an extra mount for tuning with an Autronic analyser. The sensors signal should be wired to any Analog input on the SM4, and be configured under A/F Ratio menu I/P Analogs.
  • Page 18 SM4 Manual by MRM-Racing V3.0 SM4 pin Name Colour Pin 11 O/P 8v Trigger Supply (for Hall Effect trigger) Red/Black Pin 25 I/P Cylinder + ve (signal Hall or Optical trigger) Pin 26 I/P Sync + ve (signal Hall or Optical trigger)

  • Page 19: Flying Leads

    1 coil should be selected in the software Direct Fire Ignition engines In direct fire setup the SM4 always start with ignition output 1 (not like the SMC/SM2), and then Ignition output 2 is fired then 3 & 4 (if used).

  • Page 20: Sm4 Connector Pin Out

    SM4 Manual by MRM-Racing V3.0 SM4 Connector Pin Out UNCTION UNCTION OLOUR OLOUR SW I/P ENSOR ROUND 8 O/P (SW3) 7 O/P (SW2) 2 I/P PEED 5 O/P YLINDER 1 O/P 2 O/P UTPUT 1 / S PWM 1 O/P...

  • Page 21: Output Channel Electrical Characteristics

    HORT TO GROUND FOR TO ACTIVATE HSI2 (I F NOT USED WITCHED NPUT HORT TO GROUND FOR TO ACTIVATE HSI3 (I F NOT USED WITCHED NPUT HORT TO GROUND FOR TO ACTIVATE See wiring diagram SM4 Input Switches at end of manual for pull-up resistors.

  • Page 22: Set Up Guide

    Set Up Guide Autronic Programming Software Computer Requirements The calibration and data logging software supplied with Autronic SM4 ECU may be used with computers operating under Windows 95/98/ME/XP or 2000. Computer Required Hardware The computer must have the following hardware •...

  • Page 23: Basic Windows Conventions

    SM4 Manual by MRM-Racing V3.0 Basic Windows Conventions Example:- The setup options for Autotune are only visible in the Edit-Window menu when the Base Fuel Delivery table is displayed. The drop down menus can be selected by pressing the ESC key or by pressing Alt + the underscored letter of the menu item.

  • Page 24: Software Basic Setup Guide

    SM4 Manual by MRM-Racing V3.0 Software Basic Setup Guide Base Settings When setting up your Autronic software for the first time to control your engine, there are a few simple rules of thumb that will greatly reduce you time to tune the engine.

  • Page 25: Ignition Setup

    SM4 Manual by MRM-Racing V3.0 Engine Cycles Select either 4 Stroke or 2 Stroke or Rotary Overall Fuel Calibration Multiplier This value can be anything from 0 to 39.987 This is a value that is used by the ECU to determine the scaling to use on the values in the Base Fuel Table.

  • Page 26: Injector Selection

    SM4 Manual by MRM-Racing V3.0 Ignition Trigger Edge This setting is to determine what edge of the signal output from the ECU will remain fixed. One edge of the square wave must always occur at a pre-set time, and the other edge will be flexible and begin or end at various times. If you select the wrong edge the ignition timing will be incorrect as RPM’s increase.

  • Page 27: Starting The Engine For The First Time

    Have these connected before attempting to start the engine. Software. 1. With the PC connected to the SM4 and the calibration software running, turn on the ignition (you should hear the fuel pump start and then turn off) and select “Go online”...

  • Page 28: Direct Fire Ignition Sequence Testing

    If you see two or three marks you have the ignition output sequence wrong. Swap the ignition output connectors in the SM4 harness connector or use the software under Menu M1/Advanced Setup/Base angels (Ign) until you see one mark on the balancer.

  • Page 29: Tuning Guide

    Some of the starvation can be handles by TPS acceleration enrichment. On the SM4, there is much more sophisticated methods to counter the starvation, with rpm rate and boost rate enrichment tables, and with chip version 1.09 we also have the transient enrichment system, wich completely solve the problems with spool up starvation.
  • Page 30 SM4 Manual by MRM-Racing V3.0 Full power zone: This is where the engine produce top power, and the fuelling is set very rich to avoid heat buildup and irregular combustion. Setting it to rich may give the same problems as when setting it to lean.

  • Page 31: Manual Tuning

    SM4 Manual by MRM-Racing V3.0 Best practice in calibrating fuel for the different zones: The startup zone and the forbidden zone must be estimated. The overrun deceleration zone can be part autotuned, but most often the lowest KPA cells must be estimated from the neighbour row with higher KPA.

  • Page 32: Tuning With Datalogs And Mixture Table

    SM4 Manual by MRM-Racing V3.0 Tuning with Datalogs and Mixture Table This method is done by using the PC data logger to record the air fuel ratios. Then with the both the data log and fuel table open, the software will search the data log for any RPM and Load sites that do not match the target A/F ratio table values and display them.

  • Page 33: Autotuning

    SM4 Manual by MRM-Racing V3.0 AutoTuning The Autronic Software has the ability to self tune the Base Fuel Tables in real time when using an input signal from a wide band A/F meter such as the Autronic A or B model meters.

  • Page 34: Throttle/Manifold Mapping

    In the fuel table the Load values relate to throttle position. e.g:- Load site 10 = 10% throttle position. On the SM4 you setup this under menu M2 Table Axis setup. Set Base Fuel Axis Y to Throttle position. Do not use Baro & TPS under Menu Base Settings since this is only for naturally aspirated cars.
  • Page 35 SM4 Manual by MRM-Racing V3.0 Assign I/P HSI 3 to Speed Setup HSI Slow Scale to get the correct reading like the following example: Enter the wheel diameter in meters, and then multiply with PI which is about 3.1415 .
  • Page 36 SM4 Manual by MRM-Racing V3.0 Then, straight under I/P Launch the paremeter Switch Treshold 1 will appear. Set it: Switch Treshold = 97.3 Now we can enable Launch when turning the pot below 97.3%, and disable it by turning the pot fully clockwise.
  • Page 37 SM4 Manual by MRM-Racing V3.0 Then go back to menu M5 / Launch Control and set: Launch rpm Source = GPC 12 duty This enables the GPC12 table to set the Launch RPM to between 3000 and 7000 rpm depending on how the pot is set. If pot is turned fully clockwise then launch is completely disabled, and when turning the pot down, Launch will be available.

  • Page 38: Boost Control

    SM4 Manual by MRM-Racing V3.0 Boost control Theory on boost control Basic strategies for regulating boost; • Control pressure: The pressure that affects the wastegate actuator. (Either over, or under the membrane). • Over the membrane: The chamber in a WG that add boost with added pressure.

  • Page 39: Calibrating Boost Control

    SM4 Manual by MRM-Racing V3.0 Calibrating boost control First we need to enable boost control by assigning an output for it in menu M1 / O/P setup and configure the output for the boost valve we are using. In this example we select O/P PWM 2 as output for boost control, with its output on pin 14. This is one of the dedicated PWM output pins, and it provides a reliable PWM signal with selectable frequency ranging from 9.5 to 1220 Hz.

  • Page 40: Boost Configuration Menus

    Over boost margin, for Over boost time seconds, the SM4 will cut fuel to the engine until the boost pressure is down to safe values. At the same time an Overboost error condition will be logged in the ECU error history.

  • Page 41: Example Log Of Boost Pressure

    SM4 Manual by MRM-Racing V3.0 In Fel!Hittar inte referenskälla. below is an example of boost pressure on a high gear is shown. The boost control has been tuned so the turbo will at most give a boost pressure around the wanted Boost setpoint, and well within the Over boost margin that otherwise would cause a boost cut to avoid damaging the engine.
  • Page 42 SM4 Manual by MRM-Racing V3.0 nedan show an example Boost setpoint 1 table. The X-axis of the table show Engine speed (rpm) and the Y-axis show Coolant temp. The values in the table represent wanted boost pressure in units of absolute KPA. If we want a boost pressure of 1.5 Bar, (which is 150 KPA relative), we add 100 KPA for the atmospheric pressure to convert the number into absolute pressure in KPA, and so enter the value 250.

  • Page 43: Boost Setpoint Table

    SM4 Manual by MRM-Racing V3.0 Boost setpoint table It is good practice to have at least two rows in the table, so we can set a boost curve that is used under normal conditions, and another boost curve that is used if the engine is overheated.
  • Page 44 105 degrees Celsius to be an overheat condition. When the coolant temperature climbs above 100 degrees, the SM4 will start lowering the boost pressure to the values in the lower row, (105 degrees), to save the engine.

  • Page 45: Boost Dynamic Compensation Table

    SM4 Manual by MRM-Racing V3.0 When we have configured the boost control, but the regulated boost pressure is very rough, we can come back to this table and increase the values until we get a smooth pressure curve. But for now we set it to all zeros.

  • Page 46: Modified Boost Offset Table

    SM4 Manual by MRM-Racing V3.0 That is why we start testing the boost control in a low gear. Don’t go full throttle right away. Start with feeling on the throttle that the boost pressure stops on a reasonable level. If it overshoots on part throttle, it will overboost massively on full throttle.
  • Page 47 SM4 Manual by MRM-Racing V3.0 Don’t forget to change back the cells in the Boost setpoint table to the original values, like it was in...

  • Page 48: Boost Modifier Table

    SM4 Manual by MRM-Racing V3.0 ovan, when done with calibrating the Boost offset table. Now we have calibrated the Boost range and the Boost offset table so that the boost control valve gives us the boost pressure we want. Next step is to set up the M5 / Boost modifier table.

  • Page 49: Boost Modifier Table With Protection At High Intake Air Temperatures

    SM4 Manual by MRM-Racing V3.0 Boost modifier table with protection at high intake air temperatures The Boost modifier table in will protect the engine against increasing intake air temperatures by taking away from the Boost setpoint to prevent detonation damages to the engine. The example shows that if the intake temperature rise above 65 degrees, the Boost setpoint will start to be lowered.

  • Page 50: Selecting Boost Table Based On Used Gear

    If the gear ratio is above the value set in parameter Boost setpoint 1-2, then Boost setpoint 2 table will be used. For this to work, it is essential that there is a Vehicle speed signal connected to the SM4, and that Speed setup is properly configured. See chapter about Speed setup for more information.

  • Page 51: Selecting Boost Table By External Switches

    SM4 Manual by MRM-Racing V3.0 Selecting boost table by external switches In menu M1 / I/P Switches, up to two input switches can be assigned for selecting one of the three Boost setpoint tables, using the parameters I/P Boost SW1 and I/P Boost SW2.

  • Page 52: Autronic Software User Guide

    SM4 Manual by MRM-Racing V3.0 Autronic Software User Guide All menus may not covered here, due to software upgrades . Use F1 to bring up the on screen help. FileCal Menu Open cal file Open a previously saved calibration. If online to an ECU at the time of opening you will overwrite the existing program in the PC memory and temporarily in the ECU.

  • Page 53: Copy Files To

    SM4 Manual by MRM-Racing V3.0 COPY files to BACKUP/RESTORE files. Copy calibration OR data log files to other drives. Communication “F3” key Go on line. PC data cable must be connected and ignition switched on. ECU calibration/program will be loaded into PC memory.

  • Page 54: Inc Small

    SM4 Manual by MRM-Racing V3.0 Edit-Window - Table mode Inc small “ =” key Small increment. Uses the "=" key which is labelled with the '+' key. Dec small “-“ key Small decrement. Uses the "-" key Inc large “Shift” + “=” key Large increment.

  • Page 55: Delete Axis

    SM4 Manual by MRM-Racing V3.0 Delete axis “Delete” key Deletes a line from a selected axis. Edit main axis “E” key Edits the axis value only. Keys Common Keys used for particular window. Move Right/Left/Up/Down “Right/Left” key Moves cursor right.

  • Page 56: Attribute

    SM4 Manual by MRM-Racing V3.0 Read from DIFF Reads table only from the difference seen in calibration. • When in tagged mode, only loads data into tagged cells. Read from COMPARE Reads table only from the compare file calibration. • When in tagged mode, only loads data into tagged cells.

  • Page 57: View Table

    SM4 Manual by MRM-Racing V3.0 Fine tune “F” key Sets to fine accuracy. This is shown as a green cell. Course tune “C” key Sets to course accuracy. This is shown as a yellow cell. Set user attr “A” key Sets the user attribute which will not allow AUTOTUNE to modify it.

  • Page 58: Tag Item

    SM4 Manual by MRM-Racing V3.0 Accuracy, Color protection, Initial map state & sensor position (Base fuel only). Table properties Shows the table properties. Sites Used. How many sites used by table Maximum sites How many are possible Also shows if any axis is common to other tables.

  • Page 59: Zoom In/Out

    SM4 Manual by MRM-Racing V3.0 Up/Down arrow keys then adjust time in an XY strip chart which is how long it goes back through the logged data. Zoom in/out “Up/Down” key Zooms graph in/out. Works in default time steps Lines 1..4 on 1 plot “1”...

  • Page 60: Print Page

    SM4 Manual by MRM-Racing V3.0 Print page Prints the current page to printer. Edit-Window - Display log Move “Right” or “Left” key Moves cursor right or left. • If hold cursor down will accelerate. Move 20% “CTRL” + “Right” or “Left” key Moves time buy 20% to the right.

  • Page 61: Single Line Plot

    SM4 Manual by MRM-Racing V3.0 2. Set minimum and maximum graph or instrument ranges for graphing or virtual drive (Press enter on selected item). 3. Set the line you want to graph to when graphing (Press enter on selected item).

  • Page 62: Mark Block

    SM4 Manual by MRM-Racing V3.0 Mark block “T” key Starts or stops a marked block. Press "T" then move cursor or click with mouse to position want to mark then press "S" for statistics on this data. "T" again to clear.

  • Page 63: Edit-Window - Virtual Drive

    SM4 Manual by MRM-Racing V3.0 2. Set minimum and maximum graph or instrument ranges for graphing or virtual drive (Press enter on selected item). 3. Set the line you want to graph to when graphing (Press enter on selected item).

  • Page 64: Menu M0

    SM4 Manual by MRM-Racing V3.0 6. Select items to display on the graph (Space bar). 7. Set minimum and maximum graph or instrument ranges for graphing or virtual drive (Press enter on selected item). 8. Set the line you want to graph to when graphing (Press enter on selected item).

  • Page 65: Ecu Error History

    SM4 Manual by MRM-Racing V3.0 ECU Error history Must be on-line. Shows errors recorded in ECU. Status Error is now present. Recent Error was recent. ECU telltales Telltales (Maximum or minimums) recorded inside the ECU. Only valid when on-line. "Knock record at" records the boost pressure, engine speed and coolant temperature that the "Knock retard threshold"...

  • Page 66: Monitor Gpc

    SM4 Manual by MRM-Racing V3.0 Monitor GPC Monitors ECU GPC(General purpose control) variables. This give a slower Packets/sec rate as all request variables must come from ECU. Useful when ECU is password protected or want to monitor a variable quickly.

  • Page 67: Ignition Setup

    SM4 Manual by MRM-Racing V3.0 NOTE: See "I/P Analogs, I/P Baro". When manifold sensor not connected to the manifold OR you have a seperate baro sensor, set "Baro update" to "Sensor" else use the "Baro press estimate". Engine Cycles: Options - 4 Stroke or 2 stroke engine.
  • Page 68 SM4 Manual by MRM-Racing V3.0 TS=Twin spark (engine with twin spark plug per cylinder) WS=Wasted spark with (Multi-coil) SC=Single coil MC=Multi-coil (one coil per cylinder) Mux=External multiplexer required to create extra spark events. 4C/6C-Tacho=Spare ignition O/P used as tacho signal NOTE TS(Twin spark) split can be setup in Advanced, "Ignition Base angles"...

  • Page 69: Ignition Dwell Table

    SM4 Manual by MRM-Racing V3.0 Ignition Delay Time: Ignition delay time. Delay Time between ECU ignition command and commencement of spark. Default=10. Ignition Retard Clamp: Minimum ignition timing allowed. Can be used set limits for distributor cap ignition systems, so spark will not jump to another spark plug lead tower when using antilag.

  • Page 70: I/P Cylinder & Sync

    SM4 Manual by MRM-Racing V3.0 • When main group low current injectors but using [pair] which is hi-current, then set this group 5..8 to High. I/P Cylinder & sync Cylinder and sync patterns, sensors type, edges to trigger, cylinder I/P lead angle (So ignition timing reads same as timing light).
  • Page 71 SM4 Manual by MRM-Racing V3.0 Divider offset: Adjust until "Sync/Cyl" is between 20%..80% Typical Subaru WRX 01..05=16 NOTE Cannot be larger then "EFP divider factor"-1. Number of missing teeth: Typical 0=Pre-scalar only. 1=36-1 Ford type. 2=60-2 Motronic type and 36-2 Toyota type.
  • Page 72 SM4 Manual by MRM-Racing V3.0 3. Rising and falling (select this for Ford TFI trigger) NOTE: TRIGGER EDGE MUST BE FALLING EDGE ONLY FOR RELUCTOR SENSORS Cylinder I/P filter Cylinder I/P filter. Subaru WRX 01..04=Fast One pulse per TDC=Slow NOTE: Slow = Crank pulses <...

  • Page 73: I/P Switches

    SM4 Manual by MRM-Racing V3.0 Cyl I/P lead Cylinder Input lead angle. The number of degrees BTDC the cylinder pulse trigger edge occurs. Default=60.0 degress When "Cyl & sync pattern"="SUBARU 01..04"=70.0 Trim up ignition timing so screen and timing light read same.
  • Page 74 SM4 Manual by MRM-Racing V3.0 The Boost SW1 that is inverted means function is normally on and off when channel 7 is grounded. A function that is inverted will be on (even if the wire is not connected at all) and when grounded off.

  • Page 75: O/P Setup

    SM4 Manual by MRM-Racing V3.0 O/P Setup The O/P Setup menu is used to enable and configure auxiliary functions. Some functions need an output to be enabled. Some functions that have no physical output can select "ON-No O/P" which enables the function, but to no pin.

  • Page 76: I/P Analogs

    SM4 Manual by MRM-Racing V3.0 Select O/P GPC 1 press “Enter” chose one mR type (Multi Re-direct), press “Enter”. Move to the right with “Right Arrow” key to “Invert & Select”, press “Enter” and select the desired outputs (you chose more than one here) with “Space Bar”, press “Enter”.
  • Page 77 SM4 Manual by MRM-Racing V3.0 • Manifold pressure (External or internal) • Throttle position (Self learn or fixed) • Air temperature (Autronic, NTC etc..) • Water temperature (Limp home also) • Battery voltage • Air fuel ratio • Baro (Setup also) •...
  • Page 78 SM4 Manual by MRM-Racing V3.0 I/P Manifold Manifold pressure input select. Enter for more pre-defined sensors. Default=Internal USER DEFINED=Define internal or external (On some models only), span and offsets. I/P TPS Input Throttle position sensor Span & offset can be configured manually, but calibration should normally be done as follow;...
  • Page 79 SM4 Manual by MRM-Racing V3.0 • For A/F control, must be in air fuel ratio units only. • This is a general purpose input so can be linearized to any scale. I/P EBP EBP input channel. Analog channel for exhaust back pressure.

  • Page 80: I/P Hsi 3

    SM4 Manual by MRM-Racing V3.0 I/P HSI High speed inputs. Setup • Vehicle speed. • Digital air flow meter • Variable camshaft input I/P HSI 1&2 Input HSI 1 Select functions Disable=None Cam 1=(Camshaft position 1). For camshaft control, need to setup "Variable cam setup"...

  • Page 81: Clc A/F Ratio

    The CLC has two modes, ECU internal C/L and open loop lean hwy (highway), see below. For ECU internal C/L to work you need to have a O2 sensor connected to the SM4 and configured under I/P ANALOGS – I/P A/F Ratio.

  • Page 82: Variable Cam Setup

    NOTE: Need to setup the "I/P HSI" channel and GPC(General purpose control) for camshaft feedback. Gearing Ratios Gearing Ratios are set for each gear so the SM4 can determine which gear is in use. Used for different boost maps on different gears, Traction control and displaying selected gears in the log.

  • Page 83: Advanced Setup

    SM4 Manual by MRM-Racing V3.0 engine operation. This is used for limp home in applications where pressure is the primary engine load input. Calibration range is in KPa(Gauge). Advanced Setup Setup the engine TDCs for ignition and fuel odd fire/dual injector engines.

  • Page 84: Main Ignition Timing

    SM4 Manual by MRM-Racing V3.0 The engine load variable used in this table and others that follow below is a function of throttle position if throttle position is chosen as the primary input and a function of manifold absolute pressure if pressure is the primary input.

  • Page 85: Target A/F

    SM4 Manual by MRM-Racing V3.0 Example:- Roughest point at idle = 370 370 - 50 = 320 1000 6000 320 280 NOTE: Y axis also used by Injection cylinder trims. WARNING Using different values at high rpm from low rpm can make the engine to stumble at some rpms.

  • Page 86: Ignition Trims

    SM4 Manual by MRM-Racing V3.0 Inj Cylinder Trims 1-8 Injection cylinder trims Individual calibration trim tables for each injection group (ie:-cylinder) to correct for injector calibration differences or individual cylinder efficiency differences due to non-ideal manifold. If you want an extra AUX fuel compensation table, you can uses these tables as long as you use the same compensation value for each cylinder Y axis is setup under "Tables axis setup"...

  • Page 87: Knock Tune

    SM4 Manual by MRM-Racing V3.0 X & Y axis setup in "M2 tables axis setup". NOTE1, Ignition modifier 1,2,3 can be applied to the following tables; • Main ignition table. • Overrun ignition table. • Idle ignition table. • Crank ignition table.

  • Page 88: M2 Tables Axis Setup

    SM4 Manual by MRM-Racing V3.0 Calibration represents % contribution that coolant temperature has in determining the charge temperature, its range is 0 to 100% in 0.5% increments. This calibration is particularly useful for 2 stroke engines where the charge temperature is almost totally determined by crankcase temperature.

  • Page 89: Menu M3

    SM4 Manual by MRM-Racing V3.0 Menu M3 Accel pumps setup Setups the following • Acceleration fuel maximum limit. • Acceleration Throttle Rate Threshold Accel part TPS limit Acceleration enrichment part throttle position. Throttle position that corresponds to 80% engine torque.

  • Page 90: Decel Enlenment Mult

    SM4 Manual by MRM-Racing V3.0 Decel enlenment mult Deceleration enleanment multiplier. Do not change these values until the fuel and ignition tables are fully mapped. Making changes before all fuel sites are tuned can cause confusing tuning problems. Ign adv attack rate Ignition advance attack rate (Degrees/second) Sets the maximum rate at which the ignition timing is allowed to advance.

  • Page 91: M3 Tables Axis Setup

    SM4 Manual by MRM-Racing V3.0 M3 tables axis setup Any table that can have the x or y axis changed are setup here. NOTE, Some of these axis may be in sub menus. Menu M4 W-U Enrichment mul Warm up enrichment multiplier.

  • Page 92: P-S Fast Idle Inc

    SM4 Manual by MRM-Racing V3.0 engine coolant temperature calibration sites as chosen for the warm-up enrichment calibration table above. P-S Fast idle inc Post start fast idle increase. Extra engine RPM above normal idle speed immediately after engine start. Uses idle control valve to provide the higher idle speed.Calibration for idle speed increases immediately following start-up.

  • Page 93: Iac-Minimum Opening

    SM4 Manual by MRM-Racing V3.0 IAC-minimum opening IAC minimum opening. Minimum IAC valve position allowed. Helps stop engine stalling. Cranking ignition Cranking ignition timing. Ignition timing during initial RPM when starting. Crank ignition timing can have modifiers under "M2,Ignition trims".

  • Page 94: Idle Speed Table

    SM4 Manual by MRM-Racing V3.0 Manifold pressure(Kpa)\Idle speed error(Rpm)=Idle ignition(Degrees) -400 -200 40.0 10.0 15.0 20.0 20.0 50.0 10.0 15.0 20.0 20.0 60.0 10.0 15.0 20.0 17.0 • Y axis can be selected in "Table axis setup" Idle ignition can drop back to main map with manifold pressure. See "Idle ignition setup"...

  • Page 95: Iac Tuning

    SM4 Manual by MRM-Racing V3.0 IAC Tuning Tunes the IAC parameters. Some of the tunning parameters are also tables, they are • IAC-proportion range • IAC-closed rpm value • IAC-minimum opening Check the "IAC limits" for parameters that will drop out IAC control.

  • Page 96: Iac Limits

    SM4 Manual by MRM-Racing V3.0 Used to stop engine RPM hunting during idle control. Larger value = more compensation. Typical=30 IAC Stall saver Stall saver percent Typical=2.0 See "IAC-Limits" for engine speed "Stall save threshold". IAC Extra fuel IAC extra fuel.

  • Page 97: Iac Actuator Cal

    SM4 Manual by MRM-Racing V3.0 Moving RPM Limit: This value is added to the base idle speed and "Stopped RPM Limit" and stays active for the Moving decay period. Typical setting = 500 Stopped RPM Limit: This value is added to the base idle speed and stays active until the vehicle is under the moving speed and stays active for the Stopped decay period.

  • Page 98: Boost Setpoint 1 - 3

    SM4 Manual by MRM-Racing V3.0 Boost Range 50 kpa + (maximum boost – preset boost at waste gate) Ex, wastegate manually set to 40 kpa (0,4 Bar) and max boost is 120 kpa (1,2 Bar), 50+(120-40)=130 Boost range should be set to130 kpa.

  • Page 99: Boost Offset

    SM4 Manual by MRM-Racing V3.0 Used to control how aggressively the boost valve is controlled to try and achieve the set point value. Lower value will give slower response but more stable boost with less spiking. • Do not worry if the boost is above or below the set point. Use this setting to get a smooth boost line with minimum spiking, then use the boost offset tables to correct the pressure and get a flat boost line.

  • Page 100: Overrun Shutdown Com

    SM4 Manual by MRM-Racing V3.0 • Overrun limits The percentage of throttle opening below which over-run shutdown will operate. Over-run is deceleration with closed or very small throttle openings. • Over boost limits Over boost margin. Used to set the amount of boost above the set point is acceptable before the ECU cuts injectors.

  • Page 101: Cut Fuel/Ign Pattern

    SM4 Manual by MRM-Racing V3.0 If the engine temperature exceeds 115 Deg the rev limiter will dramatically reduce the engines maximum RPM making it impossible to damage the engine due to overheating. Cut fuel/ign pattern Fuel/Ignition cut pattern. ECU cuts fuel/ignition by using 10 sequence cut pattern.

  • Page 102: Anti-Lag Ignition

    SM4 Manual by MRM-Racing V3.0 Autronic turbo-charger anti-lag system uses a coordinated fuel and ignition control strategy in conjunction with a large effective throttle opening to produce a substantial reduction in turbo-charger "lag". The system is effective from a standing start, throughout up &...

  • Page 103: Anti-Lag Cut Data

    SM4 Manual by MRM-Racing V3.0 eg:- Anti-lag idle @ 2600 RPM approx. User Define PWM output %(0 to 100) Load/RPM Example TPS/RPM Example LOAD 2400 2600 4000 2400 2600 4000 97.0 40.0 50.0 12.0 0.0 40.0 50.0 98.0 0.0 0.0 15.0...

  • Page 104: Anti-Lag Cool Down

    SM4 Manual by MRM-Racing V3.0 The anti-lag cut data cuts one cylinder at the time (for 25%) for some time before cutting next. If using 50% it cuts 2 igntion outputs (4-cyl with 4 ignition outputs) at the same time.

  • Page 105: Tc Power Cut Limit

    SM4 Manual by MRM-Racing V3.0 TC Power cut limit Launch control You enable this function by assigning it an I/P before you can use it. You assign I/Ps under "M1","I/P switches". • Launch control can also be used as a speed limiter.

  • Page 106: M5 Tables Axis Setup

    SM4 Manual by MRM-Racing V3.0 WOT min RPM RPM above that allows WOT WOT min TPS Throttle position above that allows WOT WOT shift duration Time that "WOT cut mode" is applied for. • Larger then 2.00 seconds is continuous while switch I/P is closed.

  • Page 107: Menu M6

    SM4 Manual by MRM-Racing V3.0 Menu M6 GPC 1-4 General purpose control PID type. These tables can be used for variable camshaft control or any general purpose PID control. Variable camshaft control setup. 1. Select camshaft I/P under "M1,I/P HSI".

  • Page 108: O/P Nos

    SM4 Manual by MRM-Racing V3.0 Typical O/P=Non PWM type. Has more options then Fan1 & can be used as an intercooler water spray. O/P Nos Select I/P under "M1,I/P switches". Typical O/P=Non PWM type. NOS input can be used as a switch for extra fuel or/and ignition modifier. Example race fuel or standard fuel switch.

  • Page 109: Pc Warning & Select

    SM4 Manual by MRM-Racing V3.0 PC Warning & Select Options. This only applies to the PC program only and has NO EFFECT ON THE ECU. 1. Select items required for real time display on screen & logged in PC memory.

  • Page 110: Pc Logger Setup

    SM4 Manual by MRM-Racing V3.0 NOTE2: When ECU is password protected, some live data parameters will read zero. PC Logger setup Sets up the PC logger rate, trigger and memory model. F8 always overrides the trigger (Turns PC logger ON or OFF, independent to what the trigger is.

  • Page 111: Pc Logger Reset

    SM4 Manual by MRM-Racing V3.0 F8 always overrides the trigger (Turns PC logger ON or OFF, independent to what the trigger is. However the trigger will take control again when crossing the trigger threshold) When logger full, will override oldest data in a circle buffer arrangement. Select items to log under "PC warnings &...

  • Page 112: Pc Data Stream 1

    SM4 Manual by MRM-Racing V3.0 PC data stream 1 Enables the data stream to a serial port. When disabled, the port is not opened. This is bi-directional so can be data stream output or input from another acquisition system using ECU data stream format.

  • Page 113: Retrieve Log Data

    SM4 Manual by MRM-Racing V3.0 Un-Protected.-When memory is full logger will start to overwrite the first data recorded. Example:- Log time = 10 min The logger will always have in it's memory the last 10 minutes of logged data. Trigger: External only.-Logger will not start logging until external switch is closed.

  • Page 114: Keystrokes Reference

    SM4 Manual by MRM-Racing V3.0 Keystrokes Reference General keys Esc ……………………….Opens or closes, menus. Tab………………………..Next item. Alt + menu letter…………Opens menu. Q…………………………..Closes windows. Space……………………..Find a site, places the curser at the current site. Page Up…………………..Previous table. Page Down……………….Next table. Ctrl + F10…………………Base fuel table.

  • Page 115: Fuel System

    SM4 Manual by MRM-Racing V3.0 Fuel System The best SM4 installation will yield poor result if the fuel system does not meet the demands of the engine. Insufficient fuel flow can lead to engine lean out and detonation that could destroy you engine. For the best of your engine, we urge you to check that your fuel system’s capacity and ensure that there will be sufficient supply at all loads and...

  • Page 116: Fuel Pump Capacity

    SM4 Manual by MRM-Racing V3.0 If you find your injector flow rate is insufficient, you can change to larger injectors, or increase the fuel pressure. Raising fuel pressure to increase fuel flow rate is not recommended if the desired flow is more than 20% than the system currently achieves.

  • Page 117: Ignition System

    The Dumb ignition module requires the SM4 to perform the dwell control or charge time of the ignition coil. The signal from SM4 determines the charge time of the coil and tries to maintain the specified charge time from the Ignition Dwell table at all engine speeds.

  • Page 118: Smart Ignition Modules

    SM4 Manual by MRM-Racing V3.0 Smart Ignition Modules Smart Ignition modules like Bosch BIM137 or 139 should not be used. Falling Egde & Rising Edge on Ignition Modules The Waveform that the ignition module expects can vary depending on which edge the module fires a spark.

  • Page 119: Direct Fire Cdi Autronic 500R

    CDI input and sequence 1, 2, 3, 4 and the output sequence the engine firing order. A good way to do this is to write down the SM4 Ign O/P sequence, CDI trigger I/P and engine firing order on a piece of paper before wiring.
  • Page 120 Cylinder Pulse and Reference Pulse trigger wires. CDI ground wires must be twisted and keep short (max 150mm – 6 inch) and grounded near the CDI. Do not share CDI ground with SM4 ground. Trigger ground on the CDI is not used.

  • Page 121: Trigger Interface

    SM4. The Input Trigger The SM4 is designed to trigger from either a square wave signal that varies from a low (zero) volt to a (high) voltage between 6 and 15 volt. It may also use magnetic inductive signal in conjunction with the internal reluctor adapter.

  • Page 122: Trigger Devices

    A third type op pickup, the magnetic inductive is used in distributors as well as on crank trigger units. It is now possible to directly connect this trigger to the SM4 and use the internal reluctor adapter to convert the signal to square wave required for the SM4.

  • Page 123: One Pulse Per Tdc

    SM4 Manual by MRM-Racing V3.0 and the signal first goes negative, the reluctor adapter will generate a pulse but will not trigger the Sm4 correctly resulting in incorrect ignition timing. Warning: An incorrectly wired reluctor will retard ignition timing as the RPM increases or generate multiple triggers.

  • Page 124: Multi Tooth Trigger

    Motronic trigger are a type of multi-tooth trigger but are distinct in that they use a missing tooth. The Motronic wheels that are supported by SM4 are the 60 teeth with 2 missing and 36 teeth and 1 missing tooth.
  • Page 125 SM4 Manual by MRM-Racing V3.0...
  • Page 126 SM4 Manual by MRM-Racing V3.0 Nissan trigger Nissan has three different patterns, sensor is located at camshaft. One signal consists of 360 evenly spaced pulses, each representation of 2 deg engine movement. The other consists of the same numbers of pulses as there are cylinders.

  • Page 127: Autronic Analyzer

    Autronic Analyzer Changing settings For analyser wiring information to the SM4 see wiring diagram section of this manual. The A and B model analysers have two FUNCTION SELECT and two SET buttons. These are used to make changes to the default settings. They are also used to calibrate a UEGO sensor, and restore factory default settings.

  • Page 128: Most Used Functions

    SM4 Manual by MRM-Racing V3.0 1. When changing function, press either the up or down FUNCTION SELECT buttons to cycle through the functions. All analysers have functions from Function 0 to Function 10. The B Models also have functions 11 to 14. (See Calibration Functions Section).

  • Page 129: Fault Finding

    • Check that the Hall Effect or Optical trigger has power if either of these types are used as Cylinder Pulse trigger. • Check that the SM4 has +12 volt on both ignition switch and power inputs while cranking. Some vehicles disconnect power to accessory devices during cranking to minimize power draw from these devices.

  • Page 130: Ecu Self Diagnostic

    • Operation endangering engine life. • Internal ECU malfunction This indicator is located near the main connector, and the SM4 allow connection of a remote indicator light. Each time the ECU is activated (ignition on) previously detected HISTORY or old error conditions are indicated.

  • Page 131: Diagnostic Light Fault Codes

    SM4 Manual by MRM-Racing V3.0 Diagnostic Light Fault Codes RROR ESCRIPTION NTERNAL RROR ONTINUOUSLY ETURN TO EALER FOR EPAIR LASHING ETURN TO EALER FOR EPAIR RROR TPS I/P O2 I/P NTAKE TEMPERATURE OOLANT EMPERATURE AROMETRIC RESSURE EHICLE PEED OOST RROR...

  • Page 132: Ecu Specifications

    SM4 Manual by MRM-Racing V3.0 ECU Specifications @ 20M ICROCOMPUTER NTEL BIT RUNNING 6.2V 18 V DC CONTINUOUS UPPLY OLTAGE ORMAL PERATION +/- 24V (5 AFE LIMITS +/- 80V (0.5 ALTERNATOR LOAD DUMP +/- 1000V INDUCTIVE SPIKE USEC < 1 A...

  • Page 133: Pc And Ecu Logger Diagrams

    SM4 Manual by MRM-Racing V3.0 PC and ECU logger Diagrams Wiring diagrams Option 1. Uses standard Autronic PC data cable to log using the PC/Laptop memory. Option 2. Uses ECU memory to record when switch is closed. Option 3. The socket required is a double pole single throw stereo socket.

  • Page 134: Boost Control Diagrams

    SM4 Manual by MRM-Racing V3.0 Boost Control Diagrams Internal Wastegate...

  • Page 135: E Xternal W Astegate

    SM4 Manual by MRM-Racing V3.0 External Wastegate...

  • Page 136: Main Wiring Diagram – Alternative

    SM4 Manual by MRM-Racing V3.0 Main Wiring Diagram – Alternative &'( )*+41,$#%-./#"0%12"-".3 :PJ Q<(<67-O28 Q*(28Z'7,O6(+' G8H'59<7+ R1)(,<7,<;925)(T Q*(28Z'7,O6(+' RP)38'925T Q<88'59,28,Y27283,<7Z'70,?<9',I D#I= !L#OF@$F D1#I= "#$% Q*( O6(+',RS.'T G8H ! ' () & "I#N>@$F &C#!! * +, M,.<(9,:6;;(* G8H I & :*85 "!#$%@D1...

  • Page 137: Main Wiring Diagram

    SM4 Manual by MRM-Racing V3.0 Main Wiring Diagram &'( )*+4 ,-#./0"1 2//3 :PJ Q<(<67-O28 Q*(28Z'7,O6(+' G8H'59<7+ R1)(,<7,<;925)(T Q*(28Z'7,O6(+' RP)38'925T Q<88'59,28,Y27283,<7Z'70,?<9',I D#I= !L#OF@$F D1#I= "#$% Q*( O6(+',RS.'T G8H ! ' () & "I#N>@$F &C#!! G8H I * +, M,.<(9,:6;;(* :*85 &...

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