Porsche 911 911 Catalog page 26

911 Carrera Cabriolet
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As if one clutch didn't deliver enough performance already.
Porsche Doppelkupplung (PDK).
The optional Porsche Doppelkup- PDK is like having two gearboxes
plung (PDK), with both manual in one and thus requires two
gearshift and an automatic mode, clutches – designed as a double
enables smooth gear changes wet clutch transmission.
with no interruption in the flow of
power. This results in significantly This double clutch provides
faster acceleration and lower an alternating, non-positive
fuel consumption, without having connection between the gearbox
to sacrifice the ease of automatic and the engine by means of
transmission. two separate input shafts (input
shaft 1 is nested inside the
In total, PDK has seven gears at hollowed-out input shaft 2).
its disposal. Gears 1 to 6 have
a sports ratio and top speed is
reached in 6 th gear. The 7 th gear
has a long ratio and reduces fuel
consumption even further.
The new 911 |
The flow of power from the engine
is only ever transmitted through
one clutch at a time, while the
next gear is preselected by the
second clutch. During a gear
change, a conventional shift no
longer takes place. Instead,
one clutch simply opens and the
other closes at the same time.
Gear changes therefore take
place within a few hundredths of
a second.
Clutch 1 controls the odd gears
(1, 3, 5, 7) and reverse. Clutch 2
controls the even gears (2, 4, 6).
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Transmission