3536 Power | Transmission
To make something happen,
you have to be able to convey your principles.
Transmission.
1 Power transmission in 1st gear
Porsche Doppelkupplung (PDK)
All of the new 911 Turbo models
feature the enhanced PDK transmission
with manual and automatic modes.
Porsche engineers have yet again
increased the speed and smoothness
of gear shifts. For the driver, this
means even faster shifting through
the gears without interrupting the flow of power. Acceleration
is exceptional, fuel consumption
is optimized, and performance is
delivered at a high level of comfort.
PDK has seven gears at its disposal.
Gears 1 through 6 have a sport ratio
and top speed is reached in 6th gear.
The 7th gear has a long ratio and
helps to reduce fuel consumption
by keeping engine revs low.
PDK is essentially t wo transmissions in
one. This double-clutch arrangement
provides an alternating, non-positive
connection between the two half gearboxes and the engine by means
of t wo separate input shafts.
The flow of power from the engine is
transmit ted through one half gearbox
and one clutch at a time, while the
next gear is preselected in the second
half gearbox. During a gear change, one clutch simply opens and the other
closes at the same time, enabling shifts
to take place within milliseconds.
Depending on the gearshift program
(Sport button activated or deactivated),
the shift of gears is optimized for
comfort or for sporty driving.With the optional Sport Chrono Package
(standard in the 911 Turbo S models),
PDK is enhanced by the Launch
Control and motorsport-derived
gearshift strategy functions.
1
3940
Porsche Traction Management (PTM)
Enhanced Porsche Traction Management
(PTM) with water-cooled front-axle
gearbox is standard in all of the new
911 Turbo models. It is an active all-
wheel-drive system with an electronically
variable map-controlled multiplate
clutch, Automatic Brake Differential
(ABD), and Anti-Slip Regulation (ASR).
And it delivers the high power of the new
911 Turbo models even more effectively
and efficiently to the road. This is thanks
to the new water-cooling system for the
front-axle gearbox. Water conducts heat
bet ter than air. So the cooling jackets placed on the gearbox have several
advantages: When you first start your
911 Turbo, the water ensures that the
gearbox warms up more quickly—and
reaches its optimal temperature sooner.
And during the drive itself, the heat
produced is dissipated more easily.
So more torque and more drive
force can be transmit ted through
the gearbox to the front axle.
Drive power is distributed bet ween
the permanently driven rear axle
and the front axle by means of the
electronically variable multiplate clutch.The status of the vehicle is continuously
monitored so that it is possible to respond
to different driving situations. Sensors are
used to collect a range of data, including
the rotational speed of all four wheels,
the lateral and longitudinal acceleration of
the car, and the current steering angle.
If, for example, the rear wheels begin
to lose traction under acceleration, a
greater proportion of the drive power
is automatically transmit ted to the front
axle by a more positive engagement of
the multiplate clutch. In addition, ASR
prevents wheelspin by adapting the
engine’s power output. During cornering, the optimal level of drive power is
distributed to the front wheels to help
ensure excellent lateral stability.
In conjunction with Porsche Stability
Management (PSM), PTM helps to
ensure the perfect distribution of drive
power for optimal traction in most road
scenarios, whether on long straights,
through tight corners, or on surfaces
with different friction coefficients.
