Further To 2A: Measuring Radial Force Variations
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 Porsche 911, 2012 Porsche 911, 2011 Porsche 911, 2010 Porsche 911, and 2009 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
- Tension wheel on balancing machine with radial force variation measurement (vibration monitoring system).
- Observe the operating instructions of the balancing machine (adjust the machine from time to time).
- The contact surfaces of the wheel on the balancing flange (levelling surface) and the centering surface must be clean.
- The display disabling function must be switched off.
- Adjust tire air pressure to 2.6 bar (best test pressure) when balancing and measuring radial force variations.
- Particular attention must be paid to the wheel mounting when measuring radial force variations and when balancing. Using the special pressure pieces provided by the manufacturer of the balancing machine will ensure that wheels are balanced accurately and there is the highest possible repeat accuracy. Observe the operating instructions.
Maximum deviations permitted in radial force variation results:
| Front wheels | Rear wheels | |
|---|---|---|
| Radial force variation (peak to peak vibrations) | max. 170 N | max. 170 N |
| 1st Harmonic (variation) | max. 125 N | max. 150 N |
If these values are exceeded, the tire must be matched on the rim.
If these values are not reached, the wheel must be balanced.
Information
A new tire must be fitted if the radial force variation cannot be reduced to the values listed in the table.