General Procedure For Suspension Alignment
Perform suspension alignment using an electronic wheel-alignment analyses. The measurement procedures should be taken from the operating instructions for the wheel alignment tester used!
- For nominal value for front and rear axles, refer to the Technical data.
- To rule out incorrect measurements, the following preconditions must be met before alignment or particular attention should be paid to the following points:
- Empty weight of vehicle according to DIN 70020, i.e. vehicle in ready-to-drive condition with full tank and including tools but without driver or additional weights.
- Joint and wheel-bearing play OK (wheel-bearing play cannot be adjusted).
- Tyre pressure in accordance with regulations, fairly uniform tyre tread.
- Use > 9229/1 - puller hook to pull off the hub caps (in order to fit the quick-clamping holders).
- Use the puller from the tool kit for the wheel trim covers on the central bolts on the GT4/Spyder RS.
- Quick-clamping holder with adapter (for the measured-value pickups/measuring reflectors) correctly secured to the wheels.
- Use > VAS 6918 - quick-clamping device to fasten measurement pickups/measuring reflectors to wheels with wheel bolts. Any previously used quick-clamping holders that are available can also be used.
- Use > VAS 6830 - wheel-alignment adapter for wheels with central lock to fasten measurement pickups/measuring reflectors on wheels with central lock.
- The self-centering quick-clamping holders are positioned centrally (with the claws first) in the center of the rim and are tautened in the rim by turning the straining ring (clockwise).
- Receiving surfaces for the quick-clamping holder on the wheels and the adapter surfaces must be clean and flat. Always check the flat surface on the wheels precisely in particular before fitting the quick-clamping holders.
- Strictly comply with maintenance intervals for measuring equipment and measuring platform. If measuring platform or measuring station levelling is done in-house, levelling equipment is required. A hose level is inadequate!
- Skilled handling of measuring equipment and measuring platform.
- Sliding plates with transverse motion (rotary motion) at the rear axle are advisable.
- Refer to the Technical Literature provided by Porsche AG, the manufacturer of the measuring equipment and the manufacturer of the measuring platform.
- Do not treat measured values as a whole, but very critically with regard to driving dynamics, high-speed strength of the tyres, tyre wear and cost/benefit effects (time required for correction of insubstantial deviations). The toe values are of decisive significance for driving dynamics and tyre wear.
- If the vehicle is aligned front and rear, check and adjust the wheel alignment values at the rear axle first and adjust if necessary. The camber values at the front axle are valid if the wheels are in the straight-ahead position. Steering wheel and steering gear in center position when toe is being adjusted.
- Before wheel alignment values are adjusted at front and rear axles, it is recommended that the vehicle height be checked at the DIN empty weight. Conclusions can then be drawn about wheel alignment in the event of any suspension alignment required later.
View of > VAS 6918 - quick-clamping device for vehicles with wheel bolts:
View of self-centring quick-clamping device (VAS 6918)
View of > VAS 6830 - wheel-alignment adapter view for wheels with central lock for vehicles with central lock:
VAS 6830 wheel-alignment adapter for vehicles with central wheel lock