Steering and Suspension: Service and Repair
Notes on Repair Instructions - GT2
General
The 911 Turbo (996), and also the 911 GT2, is the basic model covered by the repair, assembly and adjustment operations in the "911 Turbo (996)" Technical database. Only the GT2-specific procedures which deviate from this are additionally or separately described in this database.
Tightening Torques
Tightening torques for the 911 Turbo (996) and 911 GT2 are almost the same. Tightening torques that deviate or are additional are contained together in the tables for the 911 Turbo (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
Rear axle
NOTE:
- The special tool 9647 is required together with a torque wrench in order to adjust the vehicle height. Description under 911 GT2 suspension alignment.
- 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 Turbo (996).
Adjusting values in Specifications.
The suspension alignment of the 911 GT2 is described after the suspension alignment of the 911 Turbo (996).
Wheel Removal/Installation
As the GT2 is equipped with PCCB (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
The brake fluid change is the same as with the 911 Turbo (996).
Bleeding of the GT2 is described in a new procedure.
The 911 GT2 is equipped as standard with the new Porsche Ceramic Composite Brake (PCCB). The brake calipers, 6-piston on the front axle and 4-piston on the rear axle, are painted yellow.
The GT2 is equipped with 3-channel ABS (ABS 5.3) without PSM and without TC (Traction Control).
Because of the larger brake-disc diameter in the PCCB, the fastening screws of the front-axle and rear-axle brake calipers are 85 mm long and gold-coloured to differentiate them.
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 Turbo (996).
Boost factor 911 GT2 = 3.15 : 1. Boost factor 911 Turbo (996) = 3.85 : 1.