Porsche Cayman User Handbook Manual page 42

3
5
7
Porsche Doppelkupplung (PDK)
in detail.
The crankshaft transmits engine
torque to the dual-mass flywheel
which is then channelled through
the clutch housing and onto the
multi-plate clutches, or to be more
precise, the outer disc carrier.
Under oil pressure, clutch 1 closes
and forms a frictional connection
50
1
2
R
with input shaft 1. The torque is
now transmitted through the
differential to the rear axle.
At this stage, PDK has already
preselected the next gear.
Engine torque is already acting
on the other outer disc carrier
and, in response to a gear change
signal, the overlap shift is
initiated, i.e. as clutch 1 opens,
clutch 2 closes. The non-positive
connection with input shaft 2
6 4
Porsche Doppelkupplung (PDK)
is established, and power is
transmitted to the wheels.
The gear which is engaged is
displayed on the instrument
cluster. Depending on the
gearshift programme, the gear
change is optimised for comfort
or for sporty handling and takes
place in a matter of milliseconds.
The advantages over a fully
manual transmission are very