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Porsche Traction Management<br />
(PTM)<br />
Porsche Traction Management is an active allwheel<br />
control system designed to influence<br />
longitudinal and lateral dynamics. It is closely<br />
linked with the Porsche Stability Management<br />
(PSM) system.<br />
The permanently driven rear axle enhances the<br />
vehicle’s sporty features. Drive power is<br />
distributed fully variably to the front axle,<br />
depending on the driving situation.<br />
In conjunction with PSM, the PTM system ensures<br />
perfect distribution of power among all four<br />
wheels in every driving situation. This improves<br />
traction and driving stability and ensures the same<br />
high level of agility and dynamic response.<br />
Warning!<br />
In spite of the advantages of PTM and four-wheel<br />
drive, it is still the driver’s responsibility to adapt<br />
his driving style and maneuvers in line with road<br />
and weather conditions, as well as the traffic<br />
situation.<br />
The increased safety that is provided should not<br />
induce you to take greater risks with your safety.<br />
The limits set by the physics of driving cannot be<br />
overcome, even with PTM or four-wheel drive.<br />
Risk of accidents due to inappropriate speed<br />
cannot be reduced by PTM or four-wheel drive.<br />
202 Driving and Driving Safety<br />
Advantages of PTM<br />
– Clearly perceptible improvement in traction,<br />
driving stability and steering ability of the<br />
vehicle.<br />
– Vehicle is more manageable when driven at its<br />
performance limits.<br />
– Improved straight-ahead tracking and greater<br />
stability.<br />
– More sporty vehicle setup while making full use<br />
of all the advantages of four-wheel drive.<br />
– ASR and ABD further enhance traction for<br />
all wheels.<br />
For information on ASR and ABD:<br />
f Please see the chapter “PORSCHE STABILITY<br />
MANAGEMENT (PSM)” on page 202.<br />
Porsche Stability Management<br />
(PSM)<br />
PSM is an active control system for stabilisation of<br />
the vehicle during extreme driving maneuvers.<br />
It operates together with the Porsche Traction<br />
Management (PTM) system provided the vehicle is<br />
fitted with the relevant equipment.<br />
PSM makes use of both the ABD and ASR<br />
systems, as well as the known functions of the<br />
anti-lock brake system (ABS) and engine drag<br />
torque control system (MSR).<br />
Warning!<br />
In spite of the advantages of PSM, it is still the<br />
driver’s responsibility to adapt his driving style and<br />
maneuvers in line with road and weather<br />
conditions, as well as the traffic situation.<br />
The increased safety that is provided should not<br />
induce you to take greater risks with your safety.<br />
The limits set by the physics of driving cannot be<br />
overcome, even with PSM.<br />
Risk of accidents due to inappropriate speed<br />
cannot be reduced by PSM.
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