Porsche Stability Management (PSM 8.0)

Porsche Stability Management (PSM 8.0)

Like the new 911 Carrera 4 (997) models, the new 911 Turbo (997) is also provided with the further developed PSM vehicle stabilization system. This comprises the following features:

Longitudinal Dynamics Control
- ABS (anti-lock brake system)
- ASR (anti-slip regulation)
- ABD (automatic brake differential)
- EDTC (engine drag torque control)
- EBD (electronic brake force distribution)

Lateral Dynamics Control
- Wheel-specific braking intervention to ensure driving stability.

These systems have been modified for use with PSM 8.0 and now offer a reduced braking distance, enhanced control comfort and greater freedom for dynamic driving as well as even sportier tuning, especially with the optional Sport Chrono package.

Enhanced Longitudinal Dynamics Control

The new 911 Turbo (997) features a further-developed longitudinal dynamics control system. This improves active safety by enabling further reductions in stopping distances via the following additional functions:
- Improved (when accelerator pedal is released quickly).
- Brake assist

The enhanced braking readiness through pre-filling of the brake system serves to shorten the stopping distance in emergencies. When the accelerator pedal is released very quickly (an action which typically indicates imminent emergency braking), brake fluid is pumped from the PSM hydraulic unit to the wheel brakes before the brake pedal is actually pressed. As a result, the brake pads are gently applied to the brake discs, preparing the brake system for the impending braking operation. This significantly reduces the deceleration build-up when the brake pedal is subsequently pressed, thereby substantially improving the brake system's response and shortening the stopping distance.

The brake assist facility also reduces the stopping distance. In addition to vacuum controlled brake boosting via the tandem brake booster, additional hydraulic brake boosting also takes effect in response to full braking. On identifying full braking (when a defined force is exceeded on the brake pedal) the PSM hydraulic unit actively supplies the required brake pressure for maximum deceleration. In the interest of enhanced driving dynamics, the brake assist facility and the additional brake boost function are deactivated when PSM is switched off (PSM OFF) or the Sport button is pressed.