Rear Axle With Steel Spring Suspension

Rear Axle

The rear axle was enhanced wherever possible with the goal of lightweight construction in order to reduce the axle weight. In addition to changes in the design concept, such as direct connection of the spring struts to the body, this also involved using aluminum components.

Rear axle with steel spring suspension
- Multi-link rear axle with chassis subframe
- Wheel-bearing housing made of aluminum
- Integrated steel spring/damper unit screwed directly onto the body
- Porsche Active Suspension Management (PASM), optional
- Hydraulically damped chassis subframe bearing
- Tube-type anti-roll bar
- Hollow-bored drive shafts







Steel spring suspension with PASM

For the first time, the standard steel spring suspension is optionally available with Porsche Active Suspension Management (PASM) for the Cayenne and Cayenne S. This means that the steel spring suspension is even better equipped to meet the high demands for long-distance comfort, performance and agility.










Porsche Active Suspension Management (PASM) is a shock absorber system for active, continuous damper control on front and rear axles. It regulates the damping force for each wheel individually, depending on driving style and driving conditions. Uneven road surfaces act on the chassis via the wheels and cause vertical movements and vertical accelerations of the vehicle body. By actions such as steering, acceleration and braking, etc., the driver also produces pitch, roll and/or yaw reactions of the vehicle. In addition to body movements such as those produced by acceleration, cornering or uneven roads, the sensors also detect signals such as lateral acceleration, steering angle, brake pressure, engine torque and vehicle speed. This information is supplied to the control electronics, which then individually regulates the required damping force for each wheel in just a few milliseconds on the basis of this data. Optimally regulated damping improves the road grip of the vehicle and at the same time ensures increased driving stability, greater comfort, enhanced performance and shorter braking distances.

In the new Cayenne models, the driver can choose between three modes by way of the PASM chassis buttons on the center console: Comfort, Normal and Sport. The required damping force is continuously calculated and applied for each wheel in all three modes, as described above.

PASM is controlled by regulating the oil flow in the dampers. In Comfort mode, for example, the oil can flow freely and damper control is comfort-orientated. Depending on the selected mode, the flow paths close or are narrowed and the oil is prevented from flowing through. This principle allows the damping force for compression and rebound travel to be influenced at the push of a button.