Porsche 911 Turbo User Handbook Manual page 27

Porsche Active Suspension Management.
From ultimate comfort to optimal performance.
For the ultimate in comfort and Further driver input is not
control, the 911 Turbo is required, even if road conditions
equipped with Porsche Active change. If Sport mode is
Suspension Management (PASM) selected, for example, the
as standard equipment. This suspension is set to a harder
system provides continuous damper rating. If the quality of
adjustment of the damping force the road surface falls below a
at all four corners of the car to certain threshold, the system
suit your driving style and immediately changes to a softer
changing road conditions. rating within the Sport range.
This adjustment enhances
Porsche Active Suspension occupant comfort as well as
Management has two driver- traction and grip. When the
selectable modes, "Normal" and road surface improves, PASM
"Sport," which share a minimal automatically reverts to the
degree of overlap. In either original, harder rating.
mode, PASM reacts to changes
in the road and your driving Likewise, if Normal mode is
style by varying damping force selected and the car is driven
at each wheel. The system uses more assertively, PASM
a range of sensors to monitor automatically switches to a
the car's longitudinal and lateral harder rating within the Normal
acceleration, braking, steering setup range. As the dampers
angle, brake-pedal pressure and become stiffer, the car becomes
engine torque. A dedicated more stable, ensuring higher
control unit analyzes all this data, levels of active safety
and adjusts damping to suit the and responsiveness.
situation, within the parameters
of the driver-selected mode.
With Porsche Active Suspension
Management, agility is enhanced,
without compromising overall ride
quality. The result is a new level
of harmony between comfort
and control.
Limited-slip differential.
For enhanced grip in high-
performance driving, Porsche
offers an optional mechanical
limited-slip rear differential for the
911 Turbo with manual gearbox.
Key benefits include greater rear-
end traction when exiting hairpin
bends, and improved traction on
variable-grip surfaces. It also
compensates for changes in
wheel loads caused by throttle
modulation when cornering.
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The 911 Turbo I Performance
Rebound in Normal mode— Rebound in Sport mode—
damper piston with bypass damper piston with bypass
valve open
Compression in Normal mode— Compression in Sport mode—
damper piston with bypass damper piston with bypass
valve open
• 53 •
valve closed
valve closed