Further To 2B: Stationary Balancing With Optimization Of Rolling Smoothness

Clamp wheel on stationary balancing machine.
Observe the operating instructions for the balancing machine. Adjust the machine according to the manufacturer's instructions (if necessary).
The contact surfaces of the wheel on the balancing flange (levelling surface) and the centering surface must be clean.
Centre (clamp) the wheel from the inside with centering clamping device. This centering clamping device fits all wheel-balancing machines approved by Porsche.
Use the following tensioning equipment (Porsche version) for wheels with central bolts (Turbo I-no. 422/GT3, standard as of 2010 model):
Clamping set from Snap on/Hofmann comprising dowel sleeve -1- and pressure piece -2-: Order number C 4030969

or

Clamping set from Hunter: Order number 20-2031-1. This specific Porsche clamping set now also includes the dowel sleeve -1- and pressure piece -2- .

Fig 1: Clamping Wheel With Central Bolt

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Dowel sleeve
Pressure piece for clamping

Fig 2: Clamping Set - Wheel With Central Bolt

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Check radial and lateral runout during the first measuring run. Values of less than 1.0 mm are desirable - around 0.5 mm would be better.

Consider the size of the measured balancing weights and their distribution on the inner and outer planes (inner and outer rim flanges) critically.

A uniform distribution with low values (e.g. 25/35 g) means that the tire was fitted correctly and the quality of the tire and rim is good.

A value of 80g/80g (90g/90g using the tire pressure monitoring system) should not be exceeded with interior balancing behind wheel center. A considerably different distribution, e.g. 35/90 g is very unfavorable; this usually indicates incorrect fitting. Problem wheels of this kind often have pronounced radial and axial runout values.

This can be remedied by matching (use correct mounting paste). This can be improved with uncontrolled matching (manual); significant improvement is possible in almost all cases using the rolling smoothness optimization program (controlled matching).

Tyre pressure during balancing at required pressure.

Permissible residual imbalance of less than 3 g, or max. 3 g per plane.