Porsche 911 GT3 2003 Service Information
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Porsche 911 GT3 2003 Service Information

Porsche 911 GT3 2003 Service Information

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Service Information
2003/2004 Technik Introduction
911 GT3

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  • Page 1 ® Service Information 2003/2004 Technik Introduction 911 GT3...
  • Page 2 Important Notice:The contents of this Service Training brochure was originally written by Porsche AG for its rest-of-world English speaking market. The electronic text and graphic files were then imported by Porsche Cars N.A, Inc. and edited for content. Some equipment and technical data listed in this publication may not be applicable for our market. Specifications are subject to change without notice.
  • Page 3 2004. It is clear to see from the information provided here that the new Porsche 911 GT3 is setting new standards. This enables Porsche to aggressively develop this market segment. The content of this brochure is up to date as of February 2003.
  • Page 4 Introduction.qxd 2/28/07 2:13 PM Page II 911 GT3 911 GT3 1.4 / 2004 Page II...
  • Page 5 Introduction.qxd 2/28/07 2:13 PM Page III 911 GT3 Contents 1. Engine 2. Fuel and Ignition System 3. Manual Transmission 4. Suspension Diagnosis 5. Bodywork 6. Body Equipment, Exterior Adjustment 7. Body Equipment, Interior 8. Heating/Air-conditioning 9. Electrics/Electronics Note Programming Safety Technical Manual Page III...
  • Page 6 Introduction.qxd 2/28/07 2:13 PM Page IV 911 GT3 911 GT3 1.4 / 2004 Page IV...

  • Page 7: Table Of Contents

    Section1.qxd 2/28/07 2:05 PM Page 1 1 – Engine 911 GT3 911 GT3 General Contents 1001 Engine M 96.79 General ......1 The engine of the new 911 GT3 is a revamped version of the previous Full-load curve .

  • Page 8: Full-Load Curve

    Section1.qxd 2/28/07 2:05 PM Page 2 911 GT3 911 GT3 Special features at a glance: • Two-piece light-alloy crankcase • Lightened crankshaft and connecting rods • 8-bearing, plasma-nitride crankshaft • Titanium connecting rod • Cylinder case with Nikasil cylinder sleeves •...

  • Page 9: Crankcase

    Section1.qxd 2/28/07 2:05 PM Page 3 911 GT3 1010 Crankcase 911 GT3 The crankcase is divided into two sections and is made of an aluminium / silicon alloy. The two halves of the crankcase are machined together. It is, therefore, important to ensure that the pairing numbers match when the crankcase is assembled.

  • Page 10: Crankshaft

    Section1.qxd 2/28/07 2:05 PM Page 4 911 GT3 1348 Crankshaft 911 GT3 The crankshaft is drop-forged. The shaft has full bearing support, i.e. every connecting rod pin is supported by 2 main bearings, resulting in 8 main bearing points. Main bearing 1 (flywheel end) is configured as a thrust bearing so that it can absorb the axial forces acting on the crank- shaft.

  • Page 11: Belt Pulley

    Section1.qxd 2/28/07 2:05 PM Page 5 1376 Belt pulley 911 GT3 911 GT3 Since the moving masses in the crankgear could be significantly reduced, a torsional vibration damper is no longer necessary. A weight-optimized belt pulley is used. 1_06_04 1520 Intermediate shaft The intermediate shaft is driven by the crankshaft via spur gears.

  • Page 12: Connecting Rods

    Section1.qxd 2/28/07 2:05 PM Page 6 911 GT3 1340 Connecting rods 911 GT3 To keep the crankgear mass as low as possible and for optimum strength even at high speeds, the connecting rods, connecting-rod bolts and connecting-rod nuts in the 911 GT3 engine are made of titanium.

  • Page 13: Pistons

    Section1.qxd 2/28/07 2:05 PM Page 7 1310 Pistons 911 GT3 911 GT3 The forged pistons were designed with optimum piston crown form and piston shape along with mass reduction in mind. Therefore, compared to the previous version, the mass of the complete piston was reduced by 50 g (10%).

  • Page 14: Cylinder Head/Valve Train

    Section1.qxd 2/28/07 2:05 PM Page 8 1570 Cylinder head/Valve train 911 GT3 911 GT3 1_01_04 The cylinder heads are manufactured from extreme temperature-resis- tant light alloy. The intake and exhaust ports are surface machined to improve the charge cycle and thus power output. The combustion chambers are designed as spherical cups, the two intake and two exhaust valves of each cylinder have a diameter of 41 mm and 35.5 mm respectively around the valve disc.
  • Page 15 Section1.qxd 2/28/07 2:05 PM Page 9 This ensures the speed stability of the high-speed designed engine. In 911 GT3 911 GT3 the valve train area the masses were again reduced in comparison with the previous model. For this reason, the diameter of the flat-base tappets was reduced from 33 mm to 28 mm, thereby reducing the weight of each tappet by 21 g.

  • Page 16: Camshaft Housing

    Section1.qxd 2/28/07 2:05 PM Page 10 911 GT3 1503 Camshaft housing 911 GT3 The light-alloy camshaft housing is attached to the cylinder head. The intake and exhaust camshafts are held in the camshaft housing by means of bearing sleeves. The bearing sleeves and camshaft housing are machined together and have pairing numbers.
  • Page 17 Section1.qxd 2/28/07 2:05 PM Page 11 The cylindrical component has helical gearing both inside and outside. 911 GT3 911 GT3 The inner gearing engages with matching gearing on the inside of the camshaft gear (4). The outer gearing engages with gearing (2) mated to the camshaft stub. At the same time, the cylinder (3) forms a piston on the side facing away from the camshaft.

  • Page 18: 14 - Variocam

    Section1.qxd 2/28/07 2:05 PM Page 12 911 GT3 911 GT3 Oil lubrication system 1_9_99 1 - Oil tank 9 - Piston oil cooling jet 2 - Pressure pump 10 - Chain tensioner 3 - Safety valve 11 - Camshaft 12 - Flat-base tappet 4 - Oil filter 5 - Oil pressure sensor 13 - Suction pump...
  • Page 19 Section1.qxd 2/28/07 2:05 PM Page 13 1719 Oil return pumps 911 GT3 911 GT3 Due to the design of the engine, a large quantity of oil could collect in the cylinder head during extreme cornering manoeuvres. To prevent this, each cylinder head has its own non-return pump (16) to draw off any excess oil.
  • Page 20 Section1.qxd 2/28/07 2:05 PM Page 14 911 GT3 Cooling system 911 GT3 The principle of cross-flow cooling is implemented to ensure uniform distribution of the coolant. This prevents a difference in temperature between the individual cylinders. 1_04_04 1_05_04 1.14 / 2004 Page 1.14...

  • Page 21: Cooling System

    Section1.qxd 2/28/07 2:05 PM Page 15 Cooling system 911 GT3 911 GT3 1_12_00 1 - Coolant pump 7 - Expansion tank 2 - Crankcase 8 - Shut-off valve 3 - Thermostat 9 - Bleeder pipe (engine) 4 - Radiator 10 - Bleeder pipe (radiator) 5 - Heat exchanger 11 - Oil-to-water heat exchanger 6 - Oil-to-water heat exchanger...
  • Page 22 Section1.qxd 2/28/07 2:05 PM Page 16 911 GT3 911 GT3 1.4 / 2004 Page 1.16...
  • Page 23 Section2.qxd 2/28/07 2:14 PM Page 1 2 – Fuel and ignition system 911 GT3 911 GT3 General Contents The further development of the 3.6 liter 911 GT3 naturally-aspirated General ......1 engine was specially designed for the highest specific performance and high torque over a wide engine rpm range.

  • Page 24: Me 7.8 Motronic System

    Section2.qxd 2/28/07 2:14 PM Page 2 911 GT3 Development goals of the 911 GT3 911 GT3 • Increasing the performance potential of the new 6-cylinder, 3.6 liter Boxer engine • Well-rounded torque curve over the entire engine rpm range • Maximum speed concept with lightened valve train •...
  • Page 25 Section2.qxd 2/28/07 2:14 PM Page 3 ME 7.8 Motronic system (cont’d) 911 GT3 911 GT3 • Knock control with automatic adjustment of ignition timing with vary- ing fuel quality • Sequential manifold injection with EV-6 injection valves • Actuation of radiator fans The diagnostic functions of the •...
  • Page 26 Section2.qxd 2/28/07 2:14 PM Page 4 Motronic control unit 911 GT3 911 GT3 Data records To program the Motronic control unit, the following data records are avail- able: - for USA models (Low Emission Vehicle) - for Europe (Euro 4) and RoW vehicles with similar emission limit values...

  • Page 27: High-Speed Concept

    Section2.qxd 2/28/07 2:15 PM Page 5 High-speed concept 911 GT3 911 GT3 The maximum engine speed has been raised to 8200 rpm to increase the gear-dependent performance in the lower and medium speed range (1st to 4th gear). In 5th and 6th gear it is 8000 rpm. Improved vehicle acceleration was achieved through the respective transmission ratios.
  • Page 28 Section2.qxd 2/28/07 2:15 PM Page 6 Fuel supply 911 GT3 911 GT3 The 911 GT3 has a fuel system with a return line from the pressure reg- ulator on the engine to the fuel tank. A sucking jet pump feeds the fuel to the main pump.
  • Page 29 Section2.qxd 2/28/07 2:15 PM Page 7 ORVR system 911 GT3 911 GT3 USA models have a system that directs the vapors from refuelling of the vehicle into the activated charcoal filter. ORVR stands for: On-board Refueling Vapor Recovery System, i.e. an (On-board) system, fitted into the vehicle, during refueling (Refueling) the fuel vapors (Vapor) are recov- ered (Recovery).
  • Page 30 Section2.qxd 2/28/07 2:15 PM Page 8 911 GT3 Function 911 GT3 When refueling the vehicle, a reed contact (9), fitted in the fuel filler neck below the sealing flap, which is opened by the filling nozzle, is switched. This applies positive potential to the ORVR valve (6) and to the fresh-air valve (11).

  • Page 31: Hall Sensor And Camshaft Rotor

    Section2.qxd 2/28/07 2:15 PM Page 9 2839 Hall sensor and camshaft rotor 911 GT3 911 GT3 A modified rotor is fitted to the intake camshafts of both cylinder banks. Using the rotor position, the Hall sensor determines the current position of the inlet camshaft 4 times per camshaft revolution and relays this val- ue to the DME control unit.
  • Page 32 Section2.qxd 2/28/07 2:15 PM Page 10 Intake system 911 GT3 911 GT3 The air is drawn in via the air cleaner, it flows through the connected hot film air mass flow sensor and after the throttle control unit is distributed via a distribution pipe into the two plenums.

  • Page 33: Hot Film Air Mass Flow Sensor (Hfm 5)

    Section2.qxd 2/28/07 2:15 PM Page 11 911 GT3 911 GT3 2445 Hot film air mass flow sensor (HFM 5) The air mass sensor must not be removed from its measuring tube, as these components are matched to each other on a flow bench. The spe- cial air mass flow sensor of the 911 GT3 is designed for a nominal air flow of up to 970 kg/h.

  • Page 34: Continuous Variocam System

    Section2.qxd 2/28/07 2:15 PM Page 12 In order to reduce the emission of pollutants while the engine is warming 911 GT3 911 GT3 up, special engine management measures, i.e. retarded ignition and secondary air injection into the exhaust system to increase oxidation and ensure that the catalytic converter is heated up faster.
  • Page 35 Section2.qxd 2/28/07 2:15 PM Page 13 Actuation of the valve takes place via a pulse-width-modulated square- 911 GT3 911 GT3 wave signal. The voltage is switched between 0 volts and 12 volts in 4ms cycles (250 Hz), while the proportion of switch-on and switch-off time is changed.
  • Page 36 Section2.qxd 2/28/07 2:15 PM Page 14 Continual adjustment of inlet camshafts 911 GT3 911 GT3 1000 2000 3000 4000 5000 6000 7000 8000 n [1/min] 2_07_04 n – Engine speed in rpm NL – No load a – VarioCam adjustment angle VL –...

  • Page 37: Exhaust System

    Section2.qxd 2/28/07 2:15 PM Page 15 Exhaust system 911 GT3 911 GT3 The exhaust system is a 2-stream arrangement, i.e. the exhaust flow of the left and right cylinder banks is separate. Each exhaust system branch has an oxygen sensor fitted up- and downstream of the catalytic converter (duplex stereo oxygen sensor control).

  • Page 38: Secondary-Air Injection

    Section2.qxd 2/28/07 2:15 PM Page 16 911 GT3 Therefore, they are more compact, have a more active surface for pollu- 911 GT3 tant conversion and reach the operating temperature for exhaust emis- sion control sooner during the warm-up phase. Additionally, heating of the catalytic converters after a cold start is improved through sec- ondary air injection.

  • Page 39: Oxygen Sensing

    Section2.qxd 2/28/07 2:15 PM Page 17 Oxygen sensing 911 GT3 911 GT3 The 911 GT3 has stereo oxygen sensing with 2 oxygen sensors per cylinder bank. Each cylinder bank has one oxygen sensor upstream and one oxygen sensor downstream of the catalytic converter. The Motronic uses the signal of the oxygen sensor upstream of the catalytic converter to control the fuel/air mixture.

  • Page 40: Transmission Oil Temperature Sensor

    Section2.qxd 2/28/07 2:15 PM Page 18 The sensor element of the oxygen sensor LSF is made up of ceramic 911 GT3 911 GT3 sheets and has the form of a rectangular wafer with rectangular cross section. The individual function layers (electrodes, protective layers, etc.), are produced with screen printing technique.
  • Page 41 Section3.qxd 2/28/07 2:16 PM Page 1 3 – Transmission control 911 GT3 911 GT3 General Contents The 911 GT3 in model year 2004 is exclusively available with a 6-speed manual-shift gearbox. The transmission is based on the 6-speed General ......1 gearbox of the 911 GT2 from model year 2001.

  • Page 42: Dual-Mass Flywheel/Clutch

    As with previous Porsche vehicles, the 911 GT3 has a dual-mass flywheel (DMF) to prevent these noises. On the 911 GT3 the pressure plate of the 911 Turbo is used. Consequently, clutch compartment venti- lation is provided.

  • Page 43: Cross Section Of Transmission

    Section3.qxd 2/28/07 2:16 PM Page 3 Cross section of transmission 911 GT3 911 GT3 3_05_01 Page 3.3 3.3 / 2004...
  • Page 44 Section3.qxd 2/28/07 2:16 PM Page 4 911 GT3 Cross section of transmission with gearshift mechanism 911 GT3 3_04_01 1 - Right-angle drive 2 - Cam plate 3 - Retaining spring 4 - Blockers 5 - Detent (main shift rod) 6 - Shift fork, 3rd/4th gear 7 - Shift fork, 5th/6th gear 8 - Reverse light switch 9 - Shift fork, R gear...
  • Page 45 Section3.qxd 2/28/07 2:16 PM Page 5 Transmission ratios for transmission G96.96 911 GT3 911 GT3 The relative short 1st gear is easier on the clutch when starting and allows a favorable crawling speed. The 6th gear has been configured to allow the maximum possible vehicle speed to be reached.
  • Page 46 Section3.qxd 2/28/07 2:16 PM Page 6 Gearwheel set 911 GT3 911 GT3 The transmission is a two-shaft transmission with an overhead drive shaft and hypoid drive assembly. The free wheeling and fixed gear- wheels of all gears have been ground and honed to reduce noise to a minimum.

  • Page 47: Transmission-Oil Cooling

    Section3.qxd 2/28/07 2:16 PM Page 7 Transmission-oil cooling 911 GT3 911 GT3 An oil-to-water heat exchanger (1) serving as a transmission-oil cooler is mounted on the transmission of the 911 GT3 in order to prevent excessive transmission oil temperatures, especially when the vehicle is used for racing.
  • Page 48 Section3.qxd 2/28/07 2:16 PM Page 8 3581 Synchronization, 1st/2nd gear 911 GT3 911 GT3 As with previous transmissions, the G96.96 transmission uses a double- cone synchronization mechanism. The major advantage of this synchro- nization mechanism is that the shifting forces are reduced by approx. 30 –...

  • Page 49: Gear Retention

    Section3.qxd 2/28/07 2:16 PM Page 9 3593 Synchronization, 3rd – 6th and R gear 911 GT3 911 GT3 The synchronization mechanism used for gears 3 – 6 and for the R gear is a single-cone synchronization mechanism. The synchronizing rings for gears 3 –...
  • Page 50 Section3.qxd 2/28/07 2:16 PM Page 10 3908 Drive assembly 911 GT3 911 GT3 The drive assembly is a hypoid drive. This means that the center axis of the ring gear is 10 mm above the center axis of the drive shaft. Compared to drives with ring gear of similar size, hypoid drives can transmit higher torques since the teeth of the drive shaft are stronger.

  • Page 51: Gear Shifting

    Section3.qxd 2/28/07 2:16 PM Page 11 3546 Bearings 911 GT3 911 GT3 The input and output shafts each have four bearing points. In the trans- mission case, the two shafts are each carried on one cylindrical roller bearing. Four-point bearings, which are fitted in a tensioning plate, are used as axial supports.

  • Page 52: Shift Forks

    Section3.qxd 2/28/07 2:16 PM Page 12 3521 Shift forks 911 GT3 911 GT3 The aluminium-alloy shift forks for gears 1 and 2 and gears 3 and 4 are attached to the shift rods by means of spiral pins and cannot be adjusted.

  • Page 53: Transmission Case

    Section3.qxd 2/28/07 2:16 PM Page 13 3530 Shift interlock 911 GT3 911 GT3 Interlock pins are installed in the tensioning plate and the shift rods to ensure that only one gear can be engaged at any one time. When the shift mechanism is assembled or dismantled, it is essential to ensure that these interlock pins are not lost and that they are installed correctly.

  • Page 54: Limited-Slip Differential

    Section3.qxd 2/28/07 2:16 PM Page 14 3940 Limited-slip differential 911 GT3 911 GT3 Due to its rear-mounted engine and the resulting axle-load distribution, the 911 GT3 is able to convert engine output into forward propulsion very efficiently (good traction) even under poor road conditions (e.g. wet surface), a locking factor of 40% is sufficient in the acceleration phase.
  • Page 55 Section4.qxd 2/28/07 2:26 PM Page 1 4 – Chassis and Suspension 911 GT3 911 GT3 General Contents The chassis of the 911 GT3 has been designed for extremely sporty General ......1 driving combined with superior handling characteristics and excellent driving safety.
  • Page 56 When the 911 GT3 is delivered, its running gear is configured for use with tires approved for road use by Porsche. This configuration (incl. tire pressure) is the result of elaborate testing. If the adjustment values are changed (e.g. when using racing tires for motorsport), it is essential to restore the original running gear configuration before the vehicle is driven on public roads.
  • Page 57 Section4.qxd 2/28/07 2:26 PM Page 3 4001 Front axle 911 GT3 911 GT3 4_02_04 The front axle is based on the tried-and-tested front-axle concept of the 911 GT2. This underwent modification of the spring/shock absorber configuration to adapt it to the performance potential. The struts have external threads and height-adjustable spring seats to allow raising and lowering of the ride height as well as fine adjustment of the individual wheel loads if necessary.
  • Page 58 Section4.qxd 2/28/07 2:26 PM Page 4 Rear axle 911 GT3 911 GT3 The changes to the axle geometry are to be found in the technical manual. 4_03_04 The rear axle have been optimized to fulfill the special requirements of the 911 GT3 also with regard to motorsport use. 4271 Spring strut The struts have external threads and height-adjustable spring seats to...
  • Page 59 Right from production start, the 911 GT3 can be equipped with the Porsche Ceramic Composite Brake (PCCB) as an option. Page 4.5 4.5 / 2004...
  • Page 60 Section4.qxd 2/28/07 2:26 PM Page 6 4650 Front brakes 911 GT3 911 GT3 4_04_04 The brake disc diameters have been increased by 20 mm to 350 mm in respect of the increased driving dynamics due to the higher engine power and the optimized running gear configuration. The drilled and involute ventilated brake discs have a width of 34 mm.
  • Page 61 PCCB (optional) The 911 GT3 can be equipped with the Porsche Ceramic Composite Brake (PCCB) as an option. This is the brake system which is also installed in the 911 GT2.
  • Page 62 Section4.qxd 2/28/07 2:26 PM Page 8 4501 ABS 5.7 911 GT3 911 GT3 ABS 5.7 is incorporated in the 911 GT3. This is a 4-channel ABS, with control parameters specially adapted to the driving dynamics. On this 4- channel ABS, all 4 wheels are independently controlled. 4616 Brake cooling Special importance has also been attached to the brake cooling system...
  • Page 63 Section5.qxd 2/28/07 2:19 PM Page 1 5 – Body 911 GT3 911 GT3 General Contents The body of the new 911 GT3 is based on the bodyshell of the current General ......1 911 Carrera 4 (996), although the vehicle is equipped exclusively with rear-wheel drive.
  • Page 64 Section5.qxd 2/28/07 2:19 PM Page 2 By utilizing the additional space occupied by the front-axle differential on 911 GT3 911 GT3 the 911 Carrera 4 (996), it was possible to increase the capacity of the fuel tank in comparison to that of the 911 Carrera 4 (996), without modification to the bodyshell.
  • Page 65 Section5.qxd 2/28/07 2:19 PM Page 3 The outstanding coefficient of drag value of 0.30 was achieved through 911 GT3 911 GT3 elaborate tuning in the wind tunnel. Similarly, the lift values for front and rear axle were reduced still further in comparison with the previous model and at an unchanged coefficient of drag value.
  • Page 66 Section5.qxd 2/28/07 2:19 PM Page 4 The rear wing has a very high aerodynamic efficiency, i.e. it generates 911 GT3 911 GT3 less lift with simultaneously reduced aerodynamic drag. The rear wing can be varied in three positions for running on certain routes, in order to adapt the aerodynamic balance of the vehicle individually to the respec- tive route.
  • Page 67 Section5.qxd 2/28/07 2:19 PM Page 5 Additionally, the interior rear wall has been modified for the installation 911 GT3 911 GT3 of the engine with the required space for the separate oil tank for the dry sump lubrication. 5_04_04 Very-high-strength steel Boron steel Sheet steel Tailored blanks...
  • Page 68 Section5.qxd 2/28/07 2:19 PM Page 6 Passive safety 911 GT3 911 GT3 Like the other 911 models, the new 911 GT3 also satisfies all legal requirements worldwide with regard to passive safety. The bodyshell structure of the 911 Carrera 4 (996) M.Y. 03 has been used as the basis for the safety-relevant components used in the 911 GT3.
  • Page 69 GT3 is also fitted with four airbags (driver, passenger and two side airbags “POSIP”) as standard. This provides the maximum possible occupant protection. The Porsche Side Impact System “POSIP” consists of a side airbag and energy-absorbing door trim with door reinforce- ments made from extremely high-strength steel section.
  • Page 70 Section5.qxd 2/28/07 2:19 PM Page 8 911 GT3 911 GT3 1.4 / 2004 Page 5.8...

  • Page 71: General

    Section6.qxd 2/28/07 2:21 PM Page 1 6 – Body Equipment, Exterior 911 GT3 911 GT3 General Contents The body components such as the nose trim, sill covers and luggage compartment lid with fixed rear wing were redeveloped for the new 911 General .

  • Page 72: Sill Covers

    Section6.qxd 2/28/07 2:21 PM Page 2 6631 Sill covers 911 GT3 911 GT3 The sill covers of the new 911 GT3 are part of the aerodynamics package (Aerokit Cup II, in conjunction with nose section and luggage compartment lid with fixed spoiler) and blend into the overall profile of the vehicle.

  • Page 73: Rear Spoiler

    0.30. When the vehicle is driven on racing circuits, the spoiler can be inclined by 4 or 8 degrees through adjustment elements (available as a motorsport part from Porsche Motorsports). 6_04_04 Page 6.3...
  • Page 74 Section6.qxd 2/28/07 2:21 PM Page 4 911 GT3 911 GT3 1.4 / 2004 Page 6.4...
  • Page 75 Section7.qxd 2/28/07 2:23 PM Page 1 7 – Body Equipment, Interior 911 GT3 911 GT3 General Contents The main basic elements such as switch and door panels are taken from General ......1 the 911 Carrera (996) M.Y.
  • Page 76 Section7.qxd 2/28/07 2:23 PM Page 2 911 GT3 Interior Trim 911 GT3 Apart from the standard black leather trim, the 911 GT3 can be ordered with natural leather in Natural Brown and Natural Dark Grey via the indi- vidual program. A further “GT3”...
  • Page 77 Section8.qxd 2/28/07 2:27 PM Page 1 8 – Heating/Air-conditioning 911 GT3 911 GT3 General Contents The 911 GT3 is fitted with an air-blending heating system with four- General ......1 speed blower, interior air cleaner and a recirculated-air button.
  • Page 78 Section8.qxd 2/28/07 2:27 PM Page 2 911 GT3 911 GT3 1 - Inlet openings for fresh air 2 - Distributor flap, fresh air/recirculated air 3 - Inlet openings for recirculated 4 - Blower motor 5 - Evaporator 6 - Temperature-mix flap 7 - Heat exchanger 8 - Defrost vent 9 - Distributor flap,...
  • Page 79 Section8.qxd 2/28/07 2:27 PM Page 3 Air conditioning 911 GT3 911 GT3 Function The air-conditioning system fully automatically regulates the interior temperature as preselected in the control panel. The selection range for the interior temperature is between 64° F (18° C) and 84° F (29° C.) The generally recommended temperature to be selected is 72°...
  • Page 80 Section8.qxd 2/28/07 2:27 PM Page 4 911 GT3 8702 Operation (air-conditioning controller) 911 GT3 8_04_98 1 - Automatic button: Switches the system from the current mode to the automatic mode. 2 - AC button (economy): The compressor is deactivated through a relay when this button is depressed.
  • Page 81 Section8.qxd 2/28/07 2:27 PM Page 5 Automatic mode 911 GT3 911 GT3 Air distribution is controlled automatically. Apart from the condition variable ERL (see section “Actuators and Sensors”), the outside temper- ature and engine temperature are also evaluated by the program so that the conditions in the case of a cold-start and possible window icing can be taken into consideration.
  • Page 82 Section8.qxd 2/28/07 2:27 PM Page 6 Refrigeration circuit 911 GT3 911 GT3 1 - Air conditioning compressor 2 - Condenser left and right 3 - Fluid reservoir/Filter dryer 4 - Expansion valve 5 - Evaporator 97_287 8734 Compressor An infinitely variable 7-cylinder swash-plate (adjustable) compressor is used in the air-conditioning system.
  • Page 83 Section8.qxd 2/28/07 2:27 PM Page 7 Control of air-conditioning compressor 911 GT3 911 GT3 Actuation of the air-conditioning compressor is dependent on the fresh air intake temperature and the engine operation. Below 36° F (2° C) the compressor is switched off by a relay. Only at 38° F (3.5° C) will the control allow the compressor to be switched back on.
  • Page 84 Section8.qxd 2/28/07 2:27 PM Page 8 8770 Expansion valve and other components 911 GT3 911 GT3 1 - Expansion valve 2 - Service connection, intake side 3 - Service connection, pressure side 4 - 3-point refrigerant switch (high/low and medium pressure) 8_09_98 Actuators and sensors...
  • Page 85 Section8.qxd 2/28/07 2:27 PM Page 9 8758 Fresh-air intake temperature sensor 911 GT3 911 GT3 The temperature value of the fresh-air intake is used for compressor control. Additionally, the outside temperature, which is provided by the instrument cluster via the CAN bus, is considered during actuation. The lower of the two values obtained from the measuring points at the fresh- air intake and outside temperature sensor (behind the ribs of right nose opening) is used to evaluate the outside temperature.
  • Page 86 Section8.qxd 2/28/07 2:27 PM Page 10 Main status variable (Energy Requirement Level) 911 GT3 911 GT3 When the air-conditioning system is operating, all of the control functions of the system are dependent on this ERL status variable. The main status variable used to determine the thermal energy requirement in the vehicle (the ERL signal) is derived from the key parameters: •...
  • Page 87 • Vehicle speed (for temperature evaluation of fresh-air intake) • Engine speed • Idle period since ignition was switched off The air-conditioning controller commu- nicates with the Porsche System Tester 2 via the K data line. Page 8.11 8.11 / 2004...
  • Page 88 Section8.qxd 2/28/07 2:27 PM Page 12 Self-diagnosis 911 GT3 911 GT3 The system has a self-diagnosis function which continuously monitors certain functions of the control unit or system components and then stores any faults in a non-volatile fault memory (EEPROM). Default values for sensors If a short-circuit occurs or there is a wire break at a sensor, default values are used by the program to enable emergency operation of the...

  • Page 89: General

    Instrument cluster ....10 “Introduction CAN Bus/MOST Bus”. Multifunction display ....11 Radio Porsche CDR 23 ... .11 2706 Battery Theft protection .
  • Page 90 Section9.qxd 2/28/07 2:29 PM Page 2 9660 Battery master switch (Optional) 911 GT3 911 GT3 A battery master relay with an internal emergency switch can be retro- fitted in the 911 GT3. The external emergency switch in the washer fluid reservoir cover (front left) and the necessary wiring are pre-installed.
  • Page 91 Section9.qxd 2/28/07 2:29 PM Page 3 Emergency switch, internal 911 GT3 911 GT3 Actuating emergency switch • Fold transparent cover of emergency switch forwards. • Press red emergency switch. Resetting emergency switch • Press red emergency switch again and close cover. BW1 221 5510/5547 Electrical Front &...
  • Page 92 Section9.qxd 2/28/07 2:29 PM Page 4 911 GT3 The two lids can only be opened if the appropriate pull-switch is 911 GT3 actuated, the vehicle’s alarm system is not armed and the vehicle speed is lower than 5 km/h (3 mph). The luggage compartment lid can only be opened with the remote control if the ignition key has been removed.

  • Page 93: Battery

    Section9.qxd 2/28/07 2:29 PM Page 5 External power source 911 GT3 911 GT3 If the battery is dead, the release motors for the two lids can be operated by applying an external power supply via a battery jumper cable. There is a color-coded (red) emergency power contact in the fuse box in the driver’s side footwell.

  • Page 94: Headlamps/Illumination

    Section9.qxd 2/28/07 2:29 PM Page 6 9415 Headlamps/Illumination 911 GT3 911 GT3 As standard the 911 GT3 is equipped with the lighting of the 911 Carrera (996) including headlamps (standard halogen main headlamps with projection technology), rear lights and turn indicators. The range and road surface illumina- tion are adapted to the high perfor- Bi-Xenon (optional)
  • Page 95 Section9.qxd 2/28/07 2:29 PM Page 7 The “bi-xenon” system offers the following advantages in high- 911 GT3 911 GT3 beam mode: • Xenon high-beam headlamps • Lowering the beam aperture provides a wide and very brightly lit illumi- nation zone even at long range (particularly important on winding roads) •...
  • Page 96 Section9.qxd 2/28/07 2:29 PM Page 8 911 GT3 High beam 911 GT3 In comparison: Top: High beam Litronic headlamps Bottom: High beam bi-xenon headlamps 9_02_04 9.8 / 2004 Page 9.8...
  • Page 97 Section9.qxd 2/28/07 2:29 PM Page 9 9622 Interior light/Orientation light 911 GT3 911 GT3 The 911 GT3 is also provided with the previously introduced orientation lighting. The LED in the passenger compartment light illuminates the cockpit and center console area. It is also used as an orientation light when night driving.

  • Page 98: Instrument Cluster

    Section9.qxd 2/28/07 2:29 PM Page 10 9025 Instrument cluster 911 GT3 911 GT3 The instrumentation is largely similar to that of the 911 Carrera (996). The higher shut-off speed accounts for the extended red sector of the tachometer starting at 8200 rpm. To differentiate, a “GT3” logo is imprinted on the tachometer face.

  • Page 99: Multifunction Display

    Audio and communication equipment 9124 Radio Porsche CDR 23 The 911 GT3 is equipped with the familiar CD Radio Porsche CDR 23 and includes four speakers (two each in left and right of dashboard and left and right of rear side trims).
  • Page 100 Section9.qxd 2/28/07 2:29 PM Page 12 911 GT3 911 GT3 9_08_03 1 - Volume control (on/off switch) 2 - Eject button for CD 3 - Traffic program button 4 - Tone button 5 - Button for selecting sub menus 6 - Button for CD operation 7 - Button for radio operation (FM) 8 - Button for radio operation (AM) 9 - Manual frequency adjustment...
  • Page 101 Section9.qxd 2/28/07 2:29 PM Page 13 Functional overview of the new CDR 23 radio 911 GT3 911 GT3 General features CDR 23 Rotary volume control (left) Multifunction rotary reset control Display of station name for RDS stations Multi station button in FM and AM Automatic search in 2 directions SCAN search TP search...
  • Page 102 Section9.qxd 2/28/07 2:29 PM Page 14 911 GT3 911 GT3 Traffic Program Evaluation via RDS and RBDS Announcement recognition via TA Change to traffic program possible without music program (TP-MUTE) Announcement display in LCD (TP-INFO) TP (shown in display) Background traffic program with CD, MW and VHF s tations without traffic news 6 disk CD changer (CDC-4) connectable CD and CD changer selection via CD button...

  • Page 103: Theft Protection

    Whenever switched on, it is tested to check if the radio matches the data stored in the cluster. If this is not so, then the CDR 23 cannot be operated. The radio can only be replaced by an authorized Porsche dealership.
  • Page 104 Section9.qxd 2/28/07 2:29 PM Page 16 911 GT3 911 GT3 1.4 / 2004 Page 9.16...
  • Page 106 Part Number - - PNA 489 021 04...

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