Notes on Repair Instructions - GT3
Notes On Repair Instructions - GT3
General
The 911 Carrera (996), and also the 911 GT3, is the basic model covered by the repair, assembly and adjustment operations in the 911 Carrera (996) Technical Manual. Only the GT3-specific procedures which deviate from this are additionally described in this Technical Manual.
Tightening Torques
Tightening torques for the 911 Carrera (996) and 911 GT3 are almost the same. Deviating or or additional tightening torques are contained in the tables of the appropriate Repair Group for the 911 Carrera (996).
Adjustment Operations On The Spring Struts
The front and rear axle spring strut has a thread and a height adjusting nut -2- for height adjustment. The height adjusting nut -2- is secured against turning by the lock nut -1-. The stabilizer block (mounting saddle for the stabilizer mount) -4- is also fitted on the thread. The stabilizer block can be vertically adjusted and it is provided with a lock nut -3-. This adjustment possibility is only useful for racing. It can be used to ensure that enough clearance is available for the stabilizer mount even for deviating vehicle heights (only for racing) and also that the stabilizer mount can be fitted free of tension. The stabilizer block -4- does not need to be adjusted for the vehicle height prescribed for street use. The stabilizer block is also adjusted for replacement dampers.
Front axle
1 - Lock nut
2 - Height adjusting nut
3 - Lock nut
4 - Stabilizer block
Rear axle
1 - Lock nut
2 - Height adjusting nut
3 - Lock nut
4 - Stabilizer block
NOTE:
- The special tool 9647 is required together with a torque wrench in order to adjust the vehicle height. Description under 911 GT3 suspension alignment in Repair Group 44.
- The stabilizer block is also adjusted for replacement dampers.
Suspension Alignment
The adjustment procedures and values on the front and rear axle differ in a number of respects from those of the 911 Carrera (996).
Adjusting values in Repair Group 44.
The suspension alignment of the 911 GT3 is described after the suspension alignment of the 911 Carrera (996).
Wheel Removal/Installation
- Wheel Fastening
Wheel bolts from the GT3, as of model year 2004, are the same length as the wheel bolts from the Carrera (996). For the GT3 up to model year 2003, the wheel bolts are 5 mm longer.
Wheel bolts
A - Standard wheel bolt (Carrera and GT3 - as of model year 2004). Dimension X approx. 45 mm
B - GT3 wheel bolt up to model year 2003. Dimension X approx. 50 mm. Designation with GT or red colour (arrow)
- Vehicles With PCCB
For vehicles equipped with PCCB option (Porsche Ceramic Composite Brake), use assembly aids (assembly pins) for wheel removal/installation, in order to exclude any possibility of heavy contact of the wheel with the brake disc.
The assembly aids (2 assembly pins) are located in the luggage compartment.
Screw the 2 assembly aids (assembly pins), instead of 2 wheel bolts, into the wheel hub. During removal, first remove the 3 remaining wheel bolts and remove the wheel carefully, without touching the brake discs.
Brake - General
Bleeding and brake fluid change is the same as for 911 Carrera (996).
The fastening screws on the front axle brake calipers and the rear axle calipers are longer than those on the 911 Carrera (996) due to the larger brake disc diameter. Observe the spare parts classification for this purpose.
- 911 GT3 - Up To Model Year 2003
Cast iron brake discs with red painted 4-piston brake calipers on the front and rear axle.
3-channel ABS (ABS 5.3) without PSM and without TC (Traction Control).
- 911 GT3 - As Of Model Year 2004
Standard equipment with cast iron brake discs. The brake calipers, 6-piston on the front axle and 4-piston on the rear axle, are painted red.
Option: PCCB (Porsche Ceramic Composite Brake). The brake calipers, 6-piston on the front axle and 4-piston on the rear axle, are painted yellow.
4-channel ABS (ABS 5.7) without PSM and without TC (Traction Control).
Brake Booster
When replacing the brake booster, observe the correct allocation according to the Spare Parts catalogue. Altered transmission ratio (boost factor) compared to the 911 Carrera (996).
Boost factor 911 GT3 = 3.15 : 1. Boost ratio 911 Carrera (996) = 3.85 : 1.