Porsche 911 GT3 Cup 2008 Release Note

911 GT3 Cup
Technical Handbook, 2008 Model

Forward
This technical information will give you the possibility to reference
data, adjustment values and working procedures and make the
maintenance and repair work on the vehicle easier.
We wish you every success with your 911 GT3 Cup.
Dr.Ing.h.c. F. Porsche
Aktiengesellschaft
Vertrieb Sonder- und
Rennfahrzeuge

911GT3 Cup 2008 Model competition car
This car is specifically designed for participation in one-make cup
competitions.
For obvious reasons, measurements referring to bodywork
dimensions of the production cars cannot be used as reference.
Porsche accepts no guarantee that the vehicle conforms to the
regulations.
The car can not be registered for road use and does not comply
with German road traffic regulations.
Illustrations, descriptions and schematic drawings serve
exclusively as presentation for the text. Porsche Motorsport
accepts no liability for the completeness and conformity of the
contents of this brochure with respect to the legality of the
current regulations.

For guarantee refer to sales contract
Project Management
Manager Porsche Michelin Supercup Mr. Jens Walther Tel. [phone]
Assistant Fr. Jennifer Biela 0711 911-84096
Fax:[phone]
Service Mr. Stefan Rometsch Tel:[phone]
Fax:[phone]
Manager International Cup Mr. Gerd Schmid Tel. [phone]
Assistant Mr. Rene’ C. Maier 0711 911 82683
Technical assistance Mr. Rolf Huber 0711 911 82690
Fax [phone]
Manager Porsche Carrera Cup Mr. Helmut Greiner 0711 911 84074
Assistant Mrs. Andrea Hagenbach 0711 911 84041
Fax [phone]
Service Mr. Rainer Sauter Tel. [phone]
Fax [phone]
Sport parts sales
Mr. Kienle Tel. [phone]
Mr. Lenzner 0711 911 82423
Mr. Müller Bernd 0711 911 82687
Mr. Müller Christian 0711 911 89175
Mr. Scozzaro 0711 911 83738
Mr. Wöhr 0711 911 83363
Fax [phone]
The delivery of parts is made only against payment in cash or cash in advance.

Contents
General technical data 1
Technical engine data 2
Engine 3
Valve train / cam timing 7
Throttle reset 12
Engine tightening torques 13
Clutch 14
Gearbox 15
Gear ration chart 16
Gearbox disassembly 18
Gearbox assembly 22
Gear lever 30
Gearbox special tools . 32
Fluid capacities 33
Suspension 34
Maintenance and settings 35
Steering 36
Chassis tightening torques 39
Cooling system 42
Brake system 44
PCCB Brake system 47
Bodywork 50
Dashboard and electronic 51
Modas 58
Fire extinguisher 74
Safety instructions
Important safety instructions are markad in bold page
numbers
Only for Service CD:
To jump directly to a specific chapter click on the appropriate
line.
By using the arrow keys on the keyboard it is possible to page
through the chapter.
By pressing the “BACK” button at the bottom of every page it
is possible to return to the contents page.

1
General Technical Data
Chassis number: from WPO ZZZ 99 Z8S 7 98001
Car model: 997 830
Engine model: M 97/75
Gearbox model: G 97/ 60
Number of gears: 6
Weight
Dry weight: approx. 1170 kg
Dry weight Supercup (PCCB) approx. 1130 kg
Dimensions
Overall length (mm) 4450
Maximum width (mm) 1815
Wheelbase (mm) 2355
Front track width (mm) 1516
Rear track width (mm) 1561

2
Engine Technical Data
Engine model M97/75
Construction Six-cylinder boxer
Type of cooling water cooled
Number of cylinders 6
Cylinder bore (mm) 99.98
Stroke (mm) 76.4
Actual cubic capacity 3598 cm³
Compression ratio 12.0 (- 0.4):1
Maximum power 309 kW / 420 PS
Maximum power at 7500 r.p.m.
Maximum torque 410 Nm
Maximum torque at 6500 r.p.m.
Maximum engine revs in 1st to 6th gears 8400 r.p.m.

3
Valve timing
Inlet valve diameter (mm) 41
Inlet valve lift (mm) 12.5
Exhaust valve diameter (mm) 35.5
Exhaust valve lift (mm) 11.1
Maximum inlet valve lift 105° after TDC
Maximum exhaust valve lift 115° before TDC
Camshaft adjustment:
Set the camshaft timing with the camshaft timing and adjustment
tools.
Camshafts:
Inlet valve camshaft:Engine M 97/75 race component
Exhaust valve camshaft 911 GT3 RS
Camshaft housing:
Engine M 97/75 modified 911 GT3 RS production component
Piston/cylinder:
Piston clearance 0.02 – 0.05 mm
Crankcase:
Crankshaft: The two-piece aluminium alloy crankcase is a production
911 GT3 RS component. The forged crankshaft has 8 bearings.
Crankshaft bearings:
The crankshaft bearings are the same as those used in the 911GT3 RS
engine.
Notice:
The term 911 GT 3 RS refers to the production car version.

4
Connecting rod:
Because the connecting rods have a shot peened surface care must
be taken that no visible damage occurs when removing or fitting.
The connecting rod must not be polished.
Connecting rod bolts:
Attention: The connecting rod bolts must always be renewed
when the engine is completely overhauled. The surface of the
mating faces must not be damaged.
Tightening procedure:
Attention: The threads and mating faces must be lubricated with
engine oil.
Initial torque: 30 Nm +/- 10 % (mating torque)
Final torque: 1 x 60° +/- 2° torque angle
Piston:
The light-alloy pistons are 99.95 mm in diameter. The position of the
inlet valve pocket should be noted when fitting the piston. The
underside of the piston crown is cooled by sprayed oil. The weight
difference between all the piston/connecting rod assemblies must not
be greater than 5 grams.
Cylinder:
The cylinders are manufactured from a high-strength light-alloy with
Nicasil coating and have a bore of 99.98 mm.
Cylinder head:
The cylinder head is a GT3 RS production component.

5
Engine lubrication:
The 911 GT3 Cup engine is fitted with a dry sump lubrication system.
The oil tank is mounted to the engine.
An oil/water heat-exchanger is mounted to the engine (production GT3
RS).
1 – Oil tank 9 – Piston cooling
2 – Pressure pumps 10 – Timing chain tensioner
3 – Safety valve 11 – Camshafts
4 – Oil filter 12 – Hydraulic valve lifter
5 – Oil pressure gauge (Production) 13 – Crankcase scavenge pump
6 – Oil/water heat-exchanger 15 – Balance shaft
7 – Pressure relief valve 16 – Cylinder head supply pump
8 – Main bearing