Porsche 911 Turbo User Handbook Manual page 28

Porsche Stability Management.
Enhancing the art of driving.
The latest evolution of Porsche accelerating on a slippery surface,
Stability Management (PSM) is applying the integrated Automatic
standard equipment on the Brake Differential (ABD) and
911 Turbo. While PSM cannot Anti-Slip Regulation (ASR) functions
overcome the laws of physics, to help maintain traction and
this advanced system can provide stability. Whenever PSM intervenes,
the driver with additional control an indicator light is illuminated.
in extreme situations.
PSM remains an invisible feature
Enhanced braking.
in most everyday driving.
However, it is constantly The Anti-lock Brake System (ABS)
monitoring a host of dynamic is an integral function of Porsche
variables—including the car's Stability Management. If a wheel
direction, speed, yaw velocity approaches the threshold of
(the speed at which the car skidding under braking, PSM
rotates around its vertical axis) applies selective ABS braking to
and lateral acceleration. that wheel, to shorten the braking
distance and enhance directional
control. The ABS function is
Staying on course. smooth and precise.
If PSM perceives that the car Active safety is further enhanced
is diverging from the driver's by two additional brake functions:
intended course, it applies electronic brake prefill and
selective braking at individual brake assist.
wheels to help bring the car
in line. Porsche Stability The prefill function is automatically
Management also assists when enabled whenever the throttle
pedal is suddenly released. The
pressure in the brake lines is
marginally increased, and brake
pads come into light contact with
the discs. Should the driver
choose to brake, the system is
thus prepared to apply the
maximum force without delay.
The brake assist function is
specifically designed for use in
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emergency stops. When the Raising the threshold.
pressure on the brake pedal
exceeds a predefined threshold, When Sport mode is selected
the brake assist function uses on the optional Sport Chrono
the PSM hydraulics to apply the Package Turbo, PSM's threshold
pressure required for maximum for intervention is raised, allowing
deceleration. The result: shorter greater driver involvement.
braking distances.
If you'd rather enjoy your 911 Turbo
unassisted, PSM can be set to
standby at any time. In this case,
The 911 Turbo I Performance
it will only intervene under heavy
braking, where both front wheels
exceed the ABS threshold.
All PSM inputs are restrained,
preserving the natural agility
of the car. While safe driving is
ultimately the driver's responsibility,
PSM can provide an extra margin
of safety when you need it most.
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