Porsche CAYENNE Brochure page 31

Applying power with intelligence.
Porsche Traction Management (PTM).
Combining a range of systems be automatically varied to match
and functions, Porsche Traction changing driving conditions. For
Management (PTM) actively the toughest off-road terrain, the
distributes engine torque precisely differential can be locked via the
where it's needed most. PTM control on the centre console.
At the heart of PTM is a permanent Other major features in PTM include
all-wheel drive system with electron- a two-speed transfer gearbox (with
ically variable centre differential. low-range gearing for off-road use),
The standard torque split of 38 % an automatic brake differential
to the front and 62 % to the rear can (ABD) and anti-slip regulation (ASR).
Combined, they enable exceptional
performance and vehicle control in
normal road driving or off-road
terrain.
PTM uses the ABD and ASR
functions to achieve dynamic
handling and increased traction.
Two-stage transfer gearbox
· 66 ·
If one wheel loses traction, PTM
utilises the ABD function to apply
the corresponding brake. As a
result, more drive is automatically
transferred to the opposite wheel.
If both wheels on one axle lose
traction, ASR modifies engine output
to maintain drive.
All PTM functions are fully automatic.
All you have to do is choose high-
range mode for road and track or
low-range mode for greater off-road
traction. These are selected using
a single control on the centre
console. In low-range mode, the
gearing is reduced to enhance
off-road manoeuvrability or to
increase road traction when towing
heavy loads.
· 67 ·
Drive
All-wheel drive