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7
5
Differential
Rear Semi-gearbox 1
(1st, 3rd, 5th, 7th, R gear)
Under oil pressure, clutch 1 closes
the overlap shift is initiated, i.e. as
and forms a frictional connection
clutch 1 opens, clutch 2 closes.
with input shaft 1. The torque
The non-positive connection with
is now transmitted through the
input shaft 2 is established, and
first half gearbox – and then
power is transmitted to the wheels.
the differential – to the rear axle.
The gear which is engaged is
At this stage, PDK has already
displayed on the instrument clus-
preselected the next gear in
ter. Depending on the gearshift
the second half gearbox. Engine
programme, the gear change is
torque is already acting on the
optimised for comfort or for
other outer disc carrier and, in
sporty handling and takes place
response to a gear change signal,
in a matter of milliseconds.
Multi-plate clutch 1
Multi-plate clutch 2
6
4
3
2
1
R
Semi-gearbox 2 (2nd,
4th, 6th gear)
PDK function diagram
The advantage over a fully manual
transmission is the considerably
faster rate of acceleration for
the same rate of fuel consump-
tion. The advantage over a fully
automatic transmission is the
perceptible increase in driving
dynamics – with a similar level
of comfort, and a distinct reduc-
tion in fuel consumption.
· 44 ·
The compact dimensions of the
gearbox reduce rotational masses
which means a more direct
engine response, and the system
is more lightweight.
Motor
This, along with the long-ratio
7th gear, helps to achieve reduced
fuel consumption and emission
figures comparable with those of
a manual gearbox.
With the optional Sport Chrono
Package, PDK is enhanced by
the 'Launch Control' and 'motor-
sport-derived gearshift strategy'
functions (p. 56).
In essence, PDK combines sporti-
ness with efficiency and comfort.
What does all this mean for you?
Uninterrupted driving pleasure.
· 45 ·
Boxster |
Drive
Boxster
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