Porsche 2015 911 GT3 Cup User manual

Technical manual
911 GT3 Cup (991) MY 2015

Preface
Preface
This document should give you the opportunity to look up data, settings, und
operating regulations, and to facilitate maintenance or repair of the vehicle.
We wish you many sporting successes with your 911 GT3 Cup (991).
Customer Sport
Dr. Ing. h.c. F. Porsche
Inc.
Motorsport Sales
Version: 16.12.2014
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Preface
Competition Vehicle 911 GT3 Cup (991) Model 2015
The design of this vehicle is specially configured for use in one-make cup
competitions.
For understandable reasons, it cannot therefore be assumed that the standards set
by our production vehicles are relevant for the car body design.
Porsche assumes no responsibility for compliance with regulations.
The vehicle is not approved for use on public roads and does not comply with the
German Road Traffic Licensing Regulations.
Pictures, descriptions, and schematic drawings are used solely for illustrating the
text. We assume no responsibility for the completeness and conformity of the
contents with the prevailing sporting codes.
Due to the constant improvement of our products and the related documentation at
the time of your purchase, a new version of this technical manual could be available.
The latest Version is always accessible at the "Porsche Motorsport race car service
information" database (PMRSI), and can be downloaded on the following homepage.
https://motorsport.porsche.com
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MY 2015
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Preface
Contact
International One-make
Cup Series
Mr. Michael Dreiser Tel. [phone]
Assistent Ms. Nicole Nagel Tel. + 49 (0) 711 911 84900
Fax. + 49 (0) 711 911 88920
Technical Support Mr. Christoph Werner Tel. + 49 (0) 711 911 82690
Hr. Stefan Rometsch Tel. [phone]
Fax. + 49 (0) 711 911 89535
Porsche Mobil 1
Supercup
Mr. Jonas Krauss Tel. + 49 (0) 711 911 84042
Assistent Fr. Olivia Wegner Tel. + 49 (0) 711 911 84096
Fax. + 49 (0) 711 911 82920
Technical Support Hr. Maximilian Müller Tel. [phone]
Fax. + 49 (0) 711 911 89535
Porsche Carrera Cup
Germany
Ms. Andrea Hagenbach Tel. + 49 (0) 711 911 84041
Assistent
Mr. Marco Vierkötter
Tel. + 49 (0) 711 911 84074
Fax. + 49 (0) 711 911 82920
Technical Support Hr. Maximilian Müller Tel. [phone]
Fax. + 49 (0) 711 911 89535
Sports Divisions Sales Mr. Karlheinz Kienle Tel. + 49 (0) 711 911 82923
Mr. Klaus Lenzner Tel. + 49 (0) 711 911 82423
Mr. Christian Müller
Tel. + 49 (0) 711 911 89175
Mr. Salvatore Scozzaro
Tel. + 49 (0) 711 911 83738
Fax. + 49 (0) 711 911 82808
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Preface
Contents
Preface 1
1Engine 13
1.1 General 13
1.2 Specifications 14
1.3 Engine lubrication 15
1.3.1 Engine oil circuit 16
1.3.2 Oil level measurement 17
1.3.3 Refilling engine oil 17
1.3.4 Engine oil 17
1.4 Engine cooling system 18
1.4.1 Schematic diagram 18
1.4.2 Thermostat 18
1.4.3 Coolant 19
1.4.4 Filling the cooling system 19
1.4.5 Races at low temperatures 19
1.5 Intake system 20
1.5.1 Resonance flaps 20
1.5.2 Throttle 21
1.6 Work on the engine 22
1.6.1 Cylinder head installation 22
1.6.2 Flywheel tightening instructions 23
1.6.3 Setting the valve timing 23
1.6.4 Removing and installing the crankshaft seal – pulley side 24
1.6.5 Removing and installing the crankshaft seal – flywheel side 29
1.7 Engine tightening torque overview 36
1.8 Exhaust system 38
1.9 Fixation pre-silencer 39
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1.10 Engine run time 40
1.10.1 Behavior when exceeding the maximum speed 40
2Powertrain 41
2.1 General 41
2.2 Clutch 42
2.2.1 Installation instructions 42
2.2.2Clutch wear 43
2.2.3 Fluid for clutch actuation 43
2.2.4 Central release mechanism 44
2.3 Sequential six-speed gearbox 45
2.3.1 Overview 45
2.3.2 Technical specifications 46
2.3.3 Gear set 47
2.3.4 Drive 50
2.3.5 Oil circuit 52
2.4 Gear shift mechanism 53
2.4.1 Gear shifting 54
2.4.2 Gear recognition 56
2.4.3 „Emergency gearbox“ switch 56
2.4.4 Maintenance 57
2.5 Drive shafts 58
2.5.1 Tightening instructions 58
2.6 Gearbox run time 59
2.7 Gearbox tightening torques 59
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2.8 Transmission dismantling 61
2.8.1 Dismantling of hang-on parts 61
2.8.2 Gear housing dismantling 62
2.8.3 Gear set removal 63
2.8.4 Dismantling the shift drum 64
2.8.5 Dismantling the locking sleeve 64
2.8.6 Oil supply 65
2.8.7 Cross shaft dismantling 66
2.8.8 Pinion shaft dismantling 69
2.8.9 Differential removal 70
2.8.10 Central clutch operator removal 71
2.8.11 Connecting shaft dismantling 71
2.8.12 Drive shaft dismantling 72
2.8.13 Bearing dismantling 73
2.9 Transmission assembly 75
2.9.1 Gearbox housing pre-assembly 75
2.9.2 Gear housing pre-assembly 86
2.9.3 Differential lid pre-assembly 92
2.9.4 Pinion shaft bearing assembly 93
2.9.5 Pinion shaft 94
2.9.6 Pinion shaft position adjustment 96
2.9.7 Assembly of gear sets 98
2.9.8 Vormontage Schaltwalze 104
2.9.9 Oil pump assembly 105
2.9.10 Reverse idler gear 106
2.9.11 Locking sleeve 107
2.9.12 Shift rod and shift forks 108
2.9.13 Suction tube assembly 109
2.9.14 Central clutch operator assembly 111
2.9.15 Cutted gear housing assembly 111
2.9.16 Determining cross shaft bearing adjusting disk Q1 113
2.9.17 Cross shaft setup 114
2.9.18 Cross shaft assembly 115
2.9.19 Differential setup 119
2.9.20 Gear housing assembly 126
2.10 Overview gearbox settings 130
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3Chassis 131
3.1 General 131
3.1.1 Wheel bearing 132
3.1.2 Wheel hub 133
3.1.3 Wheel nut 134
3.1.4 Locking piece 135
3.2 Front axle 136
3.2.1 Front axle cross member 137
3.2.2 Front axle transverse control arm 138
3.2.3 Longitudinal control arm 139
3.2.4 Front axle wheel mount 140
3.2.5 Front axle shock absorber 141
3.2.6 Front axle anti-roll bar 142
3.3 Rear axle 144
3.3.1 Rear axle control arm and tie rod 145
3.3.2 Fixation trailing arm bracket 146
3.3.3 Rear axle transverse control arm 147
3.3.4 Rear axle wheel mount 148
3.3.5 Rear axle shock absorber 149
3.3.6 Rear axle anti-roll bar 150
3.3.7 Rear axle side part 152
3.4 Wheel alignment 152
3.4.1 Preparatory measures 153
3.4.2 Vehicle ride height measuring points 154
3.5 Steering system 155
3.5.1 Bleeding the steering system 157
3.6 Rims and tire 158
3.6.1 Rim 158
3.6.2 Tires 158
3.7 Brake system 159
3.7.1 General 159
3.7.2 Front axle brake 161
3.7.3 Rear axle brake 162
3.7.4 Master cylinders 163
3.7.5 Changing the brake fluid 164
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3.8 Brake pressure distribution 165
3.8.1 Balance beam basic setting 166
3.8.2 Calculating the brake power 168
3.9 Balance bar replacement kit 169
3.9.1 Replacing the trunnion 169
3.9.2 Replacing the balance bar 169
3.10 Performance setup 170
4Bodywork 171
4.1 General 171
4.2 Front and side view 172
4.3 Rear view 174
4.4 Body shell 175
4.4.1 General 175
4.4.2 Weight distribution 177
4.4.3 Weight percentage of the Body -in-White 177
4.4.4 Body aluminum parts 178
4.4.5 Body features 179
4.4.6 Body steel parts 180
4.4.7 Materials overview 181
4.4.8 Roll cage 182
4.4.9 Recovery device 183
4.5 Aerodynamics 184
4.5.1 General 184
4.5.2 Rear wing 184
4.5.3 Additional aerodynamic improvements 184
4.6 Exterior mirrors 185
4.7 Roof 185
4.8 Air jack system 186
4.9 Doors 188
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4.10 Trunk and engine lid 188
4.10.1 Trunk lid 188
4.10.2 Engine lid 188
4.11 Windows 189
4.11.1 Installing and removing the windshield 189
4.11.2 Preparing the window cutout for installation 193
4.11.3 Preparing the windshield for installation 194
4.11.4 Installing the windshield 195
4.12 Fenders 197
4.13 Wheel cover 197
4.14 Fuel system 198
4.14.1 Fuel 199
4.14.2 Defueling 199
4.14.3 Tank installation 200
4.15 Repairing the body 200
4.15.1 Repairing the front section 201
4.15.2 Replacing the front strut mount 215
4.15.3 Repairing the rear end 223
4.16 Thread repair kit 227
4.16.1 Thread repair of chassis bolt connections 229
4.17 Installing roof assembly 245
5Interior 247
5.1 General 247
5.2 Drivers safety 248
5.2.1 Seat 248
5.2.2 Seat rail tightening torques 249
5.2.3 Bucket seat tightening torques 250
5.2.4 Padding system 251
5.3 Steering wheel 252
5.4 Cockpit ventilation 253
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6Electrical system 255
6.1 General 255
6.2 Power supply 255
6.2.1 Battery 255
6.2.2 Generator 255
6.2.3 Battery master switch 256
6.3 Electrical system protection 257
6.3.1 Electrical system control unit IPS32 257
6.3.2 Fuse holder hydraulic pump 258
6.4 DME engine electronics 258
6.4.1 DME control unit 259
6.4.2 DME diagnosis 260
6.4.3 Carburation 260
6.4.4 Ignition system 260
6.5 Sensors 261
6.5.1 Sensor rated values 262
6.5.2 Optional sensors 263
6.6 ICD Display 264
6.6.1 General 264
6.6.2 Race page 266
6.6.3 Practice page 269
6.6.4 Warmup page 271
6.6.5 Vitals page 272
6.6.6 Pedals page 275
6.6.7 Additional information 277
6.7 Lights 283
6.8 Data bus system 284
6.9 Wiring harness 285
6.10 Ground connection roof antenna 285
6.11 Fire extinguisher 286
6.11.1 Testing the trigger switch 287
6.11.2 Battery change 287
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6.12 Driver Control Systems 288
6.12.1 Steering wheel 288
6.12.2 Center console 289
6.12.3 Windscreen wiper 290
6.12.4 Interior fan switch 290
7Maintenance 291
7.1 Engine 291
7.1.1 Oil level measurement using the dipstick 291
7.1.2 Oil level measurement with display 292
7.1.3 Changing the engine oil 292
7.1.4 Refilling engine oil 293
7.1.5 Oil specification 293
7.1.6 Engine cooling system 294
7.1.7 Setting the valve timing 296
7.1.8 Engine tightening torques 297
7.1.9 Engine runtime 297
7.2 Fuel system 298
7.2.1 Fuel 298
7.2.2 Fuel pump 298
7.2.3 Fuel extraction 298
7.3 Power transmission 300
7.3.1 Gearbox 300
7.3.2 Clutch 301
7.3.3 Paddle shift 303
7.3.4 Drive shafts 304
7.4 Chassis 305
7.4.1 Wheel nut 305
7.4.2 Locking piece 306
7.4.3 Wheel bearings 307
7.4.4 Wheel hub 307
7.4.5 Wheel rim 307
7.4.6 Brake system 308
7.4.7 Replacing the piston seal rings 308
7.4.8 Shock absorber/spring 310
7.4.9 Anti-roll bar 310
7.4.10 Steering system 311
7.5 Body 313
7.5.1 Airjack system 313
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7.6 Electrical system 314
7.6.1 Checks after wet races 314
7.7 Maintenance intervals 315
7.7.1 After 200 km (124 mi) or first test drive 315
7.7.2 After each session 315
7.7.3 After each weekend (sprint race) 316
7.7.4 After 3 – 4 race weekends (sprint races) 316
7.7.5 After 30 hours run time 316
7.7.6 After 50 hours run time 316
7.8 Special tools 911 GT3 Cup (991) 317
7.9 Partner contacts 319
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Engine
911 GT3 Cup (991)
MY 2015
1Engine
1.1 General
The engine of the new 911 GT3 Cup (991) is based on the proven drive unit of the
street-legal 911 GT3 RS and has been redesigned especially for use in motor sports.
New features include the electronic accelerator and the accompanying throttle.
Furthermore, the Bosch Motronic MS4.6 controller has been used as engine control.
The engine has a dry sump lubrication system including an engine-mounted oil tank.
An oil-water heat exchanger integrated in the cooling circuit is used for oil cooling.
1.1.1
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Engine
911 GT3 Cup (991)
MY 2015
1.2 Specifications
Full load curves (key: red=torque, blue=power)
1.2.1
Engine specifications
Number of cylinders 6
Type six-cylinder boxer engine
Valves/cylinders 4
Displacement 3,797 cm3
Hole 102.7 mm
Stroke 76.4 mm
Compression approx. 12 : 1
Maximum speed 8,500 rpm
Intake valve diameter 41 mm
Intake valve stroke 12.0 mm
Intake valve lobe center line 110° after TDC
Exhaust valve diameter 35.5 mm
Exhaust valve stroke 12.0 mm
Exhaust valve lobe center line 110° before TDC
Cooling water-cooled
Lubrication dry sump lubrication
Oil/water-heat exchanger
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Engine
911 GT3 Cup (991)
MY 2015
1.3 Engine lubrication
The 911 GT3 Cup (991) is provided with dry sump lubrication. This type of lubrication
system design ensures a consistant pressure oil supply to the engine components
requiring lubrication in any driving situation. The oil tank, which is installed separately
on the front side of the engine, always contains enough oil to supply the oil pump.
For regulation of the engine thermal conditions, an oil/water heat exchanger has
been integrated in the engine’s oil/water system.
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Engine
911 GT3 Cup (991)
MY 2015
1.3.1 Engine oil circuit
1 – Oil tank
2 – Positive displacement pump
3 – Safety valve
4 – Oil filter
5 – Pressure sensor
6 – Oil/water heat exchanger
7 – Pressure relief valve
8 – Crankshaft
9 – Injector
10 – Chain tensioner
11 – Camshaft
12 – Hydraulic valve lifter
13 – Suction pump, camshaft housing
14 – Crankcase vacuum pump
15 – Intermediate shaft
1.3.1.1
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Engine
911 GT3 Cup (991)
MY 2015
1.3.2 Oil level measurement
On the 911 GT3 Cup (991), the oil level is measured in the conventional way using
the dipstick. The engine must be at operating temperature (80°C (176°F)) in order to
ensure a correct measurement of the filling quantity.
See chapter 7.1
If the oil level is too high, oil may penetrate into the
intake system and damage the engine.
When refilling engine oil, it should be taken into account
that this oil only runs slowly through the dipstick guide
tube into the oil tank. Therefore, wait a few minutes
before measuring the oil level again.
1.3.3 Refilling engine oil
•New engine: 11.0 liter (11.6 qts.)
•With oil filter change: 8.3 liter (8.8 qts.)
•Without oil filter change: 8.1 liter (8.8 qts.)
1.3.4 Engine oil
When the engine is inspected by Porsche, the engine oil is always changed. The
following specification is used for this purpose:
•Mobil 1 0W – 40
NOTE
NOTE
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Engine
911 GT3 Cup (991)
MY 2015
1.4 Engine cooling system
The cooling system ensures the engine’s temperature during operation. The heat
produced by combustion is released in a controlled way to the environment via three
water radiators installed in the front, thus protecting the engine from overheating.
Furthermore, two oil/water-heat exchangers are installed in the cooling circuit. These
heat exchangers for the engine and the gearbox are used to set the oil temperatures
of the assemblies to the operating temperature and to keep this temperature stable.
The lid of the water expansion tank is equipped with a pressure regulating valve
which opens at 1,4 bar. Check the system if there is a coolant loss or leaks are
suspected. The adapter required for the test has to be screwed to the compensating
tank; it can be obtained from Hazet.
Adapter: Hazet 4800-12A.
1.4.1 Schematic diagram
1.4.2 Thermostat
The thermostat integrated in the engine opens at a water temperature of 60° C
(140° F). At approx. 72° C (162° F), the thermostat is fully open.
thermostat
1 Side radiator, left
2 Central radiator
3 Side radiator, right
4 Gearbox heat exchanger
5 Engine heat exchanger
6 Cooling water compensating tank
di – Exhaust throttle
1.4.1.1
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Engine
911 GT3 Cup (991)
MY 2015
1.4.3 Coolant
Upon delivery, the cooling system is filled with 11 liters (11.6 qts.) of water and 11
liters (11.6 qts.) of low temperature/freezing protection, ensuring a low
temperature/freezing protection up to -30° C (-22° F).
For all racing events, Porsche Motorsport recommends substituting the factory filled
coolant with 20 liters (21 qts.) of water and 2 liters (2.1 qts.) of corrosion protection
(spare part no. 997.106.907.90). Corrosion protection protects the water-carrying
parts from corrosion, reduces cavitation, lubricates the water pump and raises the
boiling point of the coolant.
For support races to the Formula 1 world
championship, the coo
lant has to be substituted as
described below.
Approx. 20 liters (21 qts.) of water plus at least 2 liters
(2.1 qts.)
of corrosion protection, spare part no.
997.106.907.90
Filling quantity: 22 liter (23.2 qts.)
1.4.4 Filling the cooling system
Refer to chapter 7 „Maintenance“.
1.4.5 Races at low temperatures
For operations at low temperatures, the radiators much be masked in order to
operate the engine at optimum operating temperature. The following procedure must
be observed:
First, cover the central radiator with masking tape (starting from the top). If this is not
sufficient, cover up to 2/3 of the two outer radiators (starting from the top). It is not
permitted to cover the side radiators completely, as their exhaust is used for cooling
the brakes.
NOTE
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