The optional PASM is an electronic damping control system. On the Boxster models, the suspension has been tuned to match the increased power of the engine. PASM actively and continuously regulates the damping force for each wheel according to the road conditions and driving style. In addition, the suspension is lowered by 10 mm.
The driver can select between two different modes: ‘Normal’ which is a blend of performance and comfort, and ‘Sport’ where the setup is much firmer. The PASM control unit evaluates the driving conditions and modifies the damping force on each of the wheels in accordance with the selected mode.
Sensors monitor the movement of the vehicle body, for example, under heavy acceleration and braking or on uneven roads. The control unit tunes the dampers to the optimum hardness for the selected mode to reduce roll and pitch still further and to increase contact between each individual wheel and the road.
In ‘Sport’ mode, the suspension is set to a harder damper rating. On uneven roads, PASM immediately switches to a softer rating within the ‘Sport’ setup range, thereby improving contact between the wheels and the road. When the road surface improves, PASM automatically reverts to the original, harder rating.
If ‘Normal’ mode is selected and the driver’s style becomes more assertive, PASM automatically switches to a harder rating within the ‘Normal’ setup range. Damping becomes harder, and driving stability and road safety are increased.