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Driving and Driving Safety
189
Despite the advantages of transmission and
chassis control systems, it is still the driver’s
responsibility to adapt his driving style and
maneuvers in line with road and weather
conditions, as well as the traffic situation.
The increased safety that is provided should not
induce you to take greater risks with your safety.
The limits set by the physics of driving cannot be
overcome.
These systems cannot reduce the risk of
accidents due to inappropriate speed.
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Adapt your driving style, maneuvers and speed
to the road and weather conditions, as well as
the traffic situation.
Porsche Traction Management (PTM)
Porsche Traction Management (PTM) ensures the
best possible power distribution to the four driven
wheels on the front and rear axles. The system
always controls power distribution in such a way
that optimal propulsion is achieved, even on an
unfavorable road surface.
PTM is active at all times and, unlike PSM,
cannot be switched off.
Advantages of PTM
– Clearly perceptible improvement in traction,
driving stability and steering ability of the
vehicle.
– Better control of the vehicle when driven at its
performance limits.
– Improved straight-ahead tracking and stability.
– The above features allow for a sportier chassis
setup.
– Optimal drive torque distribution on all four
wheels, depending on the driving program.
Porsche Torque Vectoring Plus (PTV Plus)
PTV Plus is a control system for lateral dynamic
braking intervention for sportier and more agile
cornering and features an electronically controlled
rear differential lock.
PTV Plus improves steering behavior and steering
precision with gentle braking interventions - which
are not even noticed by the driver - on the inside
rear wheel when cornering. The vehicle follows the
steering angle of the front wheels more precisely.
Understeering at the stability limit is almost fully
prevented. This in turn enhances the lateral-
acceleration potential. Higher cornering speeds
are then possible.
The electronically controlled rear differential lock
continuously checks the driving situation of the
vehicle and distributes the drive torque to the rear
axle as required. This has the following
advantages:
– Improved traction
– Reduced load change responses when
cornering at speed
– Improved driving stability at higher speeds
– Off-road traction is also significantly improved
due to the possibility of locking the rear
axle fully.
Please see the chapter “DRIVING PROGRAMS
FOR ON-ROAD AND OFF-ROAD DRIVING” on
page 184.
Porsche Stability Management (PSM)
PSM is an active control system for stabilization of
the vehicle during extreme driving maneuvers.
Advantages of PSM
– Best possible traction and lane-holding ability
in all driving situations – even on road surfaces
with varying friction.
– The system compensates for undesired
vehicle reactions (load-alteration effect) when
the driver releases the accelerator pedal or
brakes on corners. This compensation
functions up to the maximum lateral
acceleration.
– PSM actively stabilizes the vehicle as required
during dynamic driving maneuvers (e.g. rapid
steering movements, during lane changes or
on alternating corners).
– Improved braking stability on corners and on
different or varying road surfaces.
– Improved brake function and shorter stopping
distance in the event of emergency braking.
Operational readiness
PSM is switched on automatically every time you
start the engine.
Driver Responsibility
WARNING
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