Suspension Alignment, Complete
Suspension Alignment - GT2
Suspension Alignment, Complete
NOTE: The 911 GT2 suspension alignment contains only those procedures which deviate from those for the 911 Turbo (996) suspension alignment.
Driving Onto Measuring Platform
Due to the reduced vehicle height, additional access ramps, for example 959 access aids, are required to drive the vehicle onto the measuring platform. Otherwise the front spoiler would bottom on the platform. A measuring platform without a sloped position is unsuitable.
Tools
The special tools for suspension alignment of the 911 Turbo (996) are also used for the 911 GT2.
Additionally, a hook wrench insert (special tool 9647) is required for the 911 GT2. The special tool 9647 is required to change the vehicle height and to adjust the stabilizer mating bearing on the front and rear axle. The special tool is used together with a torque wrench to tighten the lock nuts (slotted nuts) on the spring struts. Tightening torques in Steering and Suspension, Specifications.
Special tool 9647
Deviating Points For GT2
In the description of the 911 GT2 suspension alignment, only those points are listed which differ from the 911 Turbo (996).
These are:
- Changed adjustment values.
- Front-axle camber setting: Unlike the 911 Turbo (996), a basic camber adjustment is made by means of intermediate plates on the 2-part control arm of the front axle for the 911 GT2. A 1 mm thick adjustment plate is fitted as standard on the right and left in the 911 GT2 (M002 and M003). Camber adjustment (fine adjustment) is carried out at the spring-strut mount as for the 911 Turbo (996).
- For the measured-value pickups, electronic wheel alignment testers require spoiler adapters of 50 mm and 100 mm in length, depending on the wheel alignment tester. This is the only means of enabling data transfer from the right side to the left. The wheel alignment testers recommended by Porsche which have a spoiler measuring program require 100 mm spoiler adapters on the rear axle. Observe the operating instructions from manufacturer of the measuring instrument if necessary.
- In the case of the 911 GT2, the vehicle height can be adjusted on the front and rear axle using the adjusting nut(s) at the corresponding spring strut(s). Max. wheel-load difference to right and left on the front and rear axle is 15 kg.
- Check all wheels for clearance after adjustment and assembly work.
NOTE:
- If a wheel removal is necessary, use assembly aids (assembly pins) 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 before wheel removal/installation. During removal, first remove the 3 remaining wheel bolts and remove the wheel carefully, without touching the brake discs.
Notes on Height Changes/Wheel-Load Changes
When changing the height/wheel load, the following must be noted:
- A one-sided height change causes a wheel-load change at the same time. A wheel-load change on one wheel also alters the wheel loads of the other wheels.
- A one-sided increase in the installed spring preload (raising vehicle) increases the wheel load.
- A one-sided decrease in the installed spring preload (lowering vehicle) decreases the wheel load.
- A change in the wheel-load is always transferred diagonally onto the other axle side. This means that if the wheel load on one wheel is decreased or increased, the same occurs on the diagonally opposite wheel.
- Maximum wheel-load difference from left to right on front and rear axle 15 kg.
- Example: Rear left spring preload C is increased. In this way the wheel load: rear left C and front right B greater ---- rear right D and front left A less. -------
Vehicle Height GT2
The vehicle height on the front and rear axle of the 911 GT2 can be adjusted. Before wheel alignment values are adjusted at front and rear axles, it is recommended or necessary that the height adjustment be checked at the DIN empty weight. The height adjustment possibility allows the wheel-load difference from right to left to be kept as small as possible, provided that wheel load weighing machines are available. The wheel-load difference is adjusted by changing the vehicle height within the height tolerance. The priority is to achieve the smallest possible wheel-load difference from left to right.
The height adjustment possibility allows:
- Differing wheel loads on left and right to be corrected. At the correct height the wheel-load differences lie within a permissible range, provided that the coil springs have the same installation position (installed spring preload) on each axle. Tolerance 1 mm. Wheel-load differences can be kept as low as possible in conjunction with wheel-load weighing machines. Tolerance from right to left on front and rear axle under 15 kg.
- Any impermissible height differences -front axle to rear axle- can be balanced out (only within the permissible tolerance).
- For the height check of the ready-to-drive vehicle (full tank and tools), place the vehicle on a level surface or on the measuring platform.
Front axle
- Front axle: Measure from road contact surface to the lower edge of the hexagon-head bolt of the tension-strut screw connection to the body. Measuring point as with 911 Turbo (996).
Rear axle
- Rear axle: Measure from wheel contact surface to the locating bore in the rear-axle side section (between toe and camber eccentrics).
NOTE:
Required values for front and rear axle can be found in the table "Adjusting values for suspension alignment".
The vehicle height on the front and rear axle is adjusted by turning the adjusting nut -No. 2-. The lock nut -No. 1- must first be loosened. Use a hook wrench or special tool 9647 (hook wrench insert) for this purpose.
Adjusting nut -No. 2- -turn to the right = vehicle higher - turn to the left = vehicle lower
After adjustment of the lock nut(s) -No. 1- on the front and rear axle, tighten with special tool 9647 in conjunction with a torque wrench. Tightening torque -No. 1- = 50 Nm (37 ftlb.).
If the vehicle is measured front and rear, check and adjust the rear axle first. Nominal values in Alignment, Specifications. After adjustment, tighten the appropriate screwed connections with the prescribed tightening torque. See tables in Steering and Suspension Specifications.
Front axle
Rear axle
Wheel Alignment
NOTE:
- In the 911 GT2, ABS (without PSM) is used as a control system.
- After the wheel-alignment values are changed, the PSM-related work is therefore omitted in contrast to the 911 Turbo (996).
Front-axle camber setting
NOTE:
- Front-axle camber setting: Unlike the 911 Turbo (996), a basic camber adjustment is made by means of intermediate plates -arrow- on the 2-part control arm of the front axle for the 911 GT2.
- A 1 mm thick adjustment plate is fitted as standard on the right and left in the 911 GT2 (M002 and M003).
- Check all wheels for clearance after adjustment and assembly work.
Control arm GT2
- - Basic camber setting through adjustment plates -arrow-
- - series = one 1 mm thick adjustment plate
By using thicker adjusting shims, the 2-part control arms permit a correspondingly increased camber value to be obtained for circuit use.
In relation to this, observe also the note in Instructions for Fitting Diagonal Control Arm on Control Arm - GT2.
Camber fine adjustment
- The camber is adjusted by moving the spring strut transversely. For this purpose, loosen the three M8 fastening nuts -arrows- of the spring-strut mount. To shift the spring strut inwards or outwards -arrows-, remove the cover cap over the piston rod.
Camber/toe, rear axle
- As with the 911 Turbo (996), the wheel-alignment values on the rear axle are set at the toe eccentric -A- and at the camber eccentric -B-.
Instructions For Fitting Diagonal Control Arm on Control Arm - GT2
NOTE: In the case of the road version of the GT2 (M002 and M003), the diagonal control arm must be fitted at the centre bore (No. 1) of the control arm.
Control arm, left
Control arm, right