Porsche Cayenne Turbo Driver Manual page 186

Porsche Traction Management (PTM)
Porsche Traction Management is a full-time all-
wheel control system designed to influence the
longitudinal and lateral dynamics. It is closely
linked with the Porsche Stability Management
(PSM) control system.
PTM ensures the best possible power distribution
to the four driven wheels at the front and rear
axles. The system realises this optimal traction by
intervening in the lock control function of the
transfer box and rear differential. PTM is active at
all times and, unlike PSM, cannot be switched off.
Advantages of PTM
– Obvious improvement in traction, driving
stability and steering ability of the vehicle.
– Vehicle is more manageable when driven at its
performance limits.
– Improved straight-ahead tracking and stability.
– The above features allow for a sportier setup
of the running gear.
– TCS and ABD further enhance traction for all
wheels.
186
Driving and Driving Safety
Safety notes!
In spite of the advantages of PTM, it is still the
driver's responsibility to adapt his driving style and
manoeuvres in line with road and weather condi-
tions, 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, even with PTM.
Risks of accident due to inappropriate speed
cannot be reduced by PTM.
Full-time all-wheel drive
With the four-wheel drive, the drive power is
variably distributed to the front and rear wheels.
Power distribution and wheel speed compensation
between the front and rear axles is realised with a
transfer box.
Distribution of the drive power depends on the
wheel speed difference between the two axles.
The transfer box always controls power distribu-
tion in such a way that optimal propulsion is
achieved, even on an unfavourable road surface.
Full-time all-wheel drive ensures optimum handling
and a high level of driving stability.
Safety notes!
In spite of the advantages of four-wheel drive, it is
still the driver's responsibility to adapt his driving
style and manoeuvres 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, even with four-wheel drive.
Risks of accident due to inappropriate speed
cannot be reduced by four-wheel drive.