2011 PORSCHE CAYMAN S automatic transmission

89
Porsche Doppelkupplung (PDK,
p. 48) is available as an option.
The key elements of PDK are its
seven gears, t wo half gearboxes
and t wo clutches. It features both
manual and automatic modes.
Gears are changed using the gear
selector for PDK, the switches
on the sports steering wheel or
the new optional SportDesign
steering wheel with gearshift
paddles with race track control
logic. The gear change takes
place in a mat ter of milliseconds
without any interruption in the
flow of power. The advantage

over a fully manual transmission
is the considerably faster rate of
acceleration for the same rate of
fuel consumption. The advantage
over a fully automatic transmission
is the perceptible increase in
driving dynamics – with a similar
level of comfort, and a distinct
reduction in fuel consumption.
Two dif ferent characters. One
personalit y. Their drive for power
is impressive, their spirited nature
fascinating. Two sports coupés
that go beyond all conventions.
Two cars that draw their drivers
under their spell, forever.
The concept behind the Cayman
models is the ‘Le Mans Coupé’,

a sports coupé designed in 1953
specifically for this legendary
race and based on the 550
Spyder. Its mid- engine layout is
what made this car special. The
car’s low centre of gravit y gave it
tremendous agilit y and cornering
dynamics. From this one basic
idea came great success, and
with this success our experience
grew. The result? Two sophisticated
sportscars. The Cayman and the
Cayman S.
Their uncompromising perform -
ance is generated by t wo engine
developments, which stand out
above all for their light weight
construction, power output
and ef ficiency. The Cayman has
a 2.9 -litre flat-six engine with a
power output of 195 kW (265 hp).
Even more impressive are the per -
formance values of the Cayman S
with direct fuel injection (DFI, p. 34).
The fuel/air mixture is prepared

entirely in the combustion chamber
af ter having been metered and
injected directly, with millisecond
precision. This means even more
power and torque. To express
this in figures, its 3.4-litre flat-
six engine unleashes a might y
235 kW (320 hp). Depending on
the model, it has been possible
to reduce fuel consumption by
up to 15 % and CO
2 emissions by
up to 16 %.
In either model, this tremendous
power is delivered to the road
by a precision six-speed manual
gearbox.
The primary target group:
your central nervous system.
The Cayman models.
Cayman | The concept
Cayman models: fuel consumption in l/100 km (mpg) urban 14.1 (20.0) –13.6 (20.8) ·
extra urban 7.1 (39.8) – 6.5 (43.5) · combined 9.5 (29.7) –9.1 (31.0); CO
2 emissions 223–214 g / km

4849
If you want to get straight to the point,
you don’t take any detours.
Transmission.
Cayman S
This double clutch provides an
alternating, non-positive connection
bet ween the t wo half gearboxes
and the engine by means of t wo
separate input shafts (input shaft
1 is nested inside the hollowed-out
input shaft 2).
The flow of power from the engine
is only ever 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,
therefore, a conventional shif t no
longer takes place. Instead, one
clutch simply opens and the other
closes at the same time. Gear
changes can therefore take place
within milliseconds.
Clutch 1 controls the first half
gearbox, which contains the
odd gears (1, 3, 5, 7) and reverse.
Clutch 2 controls the second,
which contains the even gears
(2, 4, 6).
Porsche Doppelkupplung (PDK).
The optional Porsche Doppel
-
kupplung (PDK), with both manual
gearshif t and an automatic mode,
enables smooth gear changes
with no interruption in the flow of
power. This results in significantly
faster acceleration and lower
fuel consumption, without having
to sacrifice the ease of automatic
transmission. In total, PDK has seven gears
at its disposal. Gears 1 to 6 have
a sports ratio and top speed is
reached in 6th gear. The 7th gear
has a long ratio and helps to
reduce fuel consumption even
f u rt h e r.
PDK is essentially t wo half gear-
boxes in one and thus requires
t wo clutches – designed as a
double wet clutch transmission.
Cayman | Drive

50
46
2
1
R
7 3
5
51
4
6
2
R1
3
7
5
Multi - plate clutch 1
Multi - plate clutch 2
Semi -gearbox 2
(2nd, 4th, 6th gear)
Semi -gearbox 1
(1st, 3rd, 5th, 7th, R gear)
Differential
Engine
Rear wheel
Rear wheel
Porsche Doppelkupplung (PDK) PDK function diagram
is established, and power is
transmit ted to the wheels.
The gear which is engaged is
displayed on the instrument
cluster. Depending on the
gearshif t programme, the gear
change is optimised for comfort
or for sport y handling and takes
place in a mat ter of milliseconds.
The advantages over a fully
manual transmission are very Package, PDK is enhanced by
the ‘Launch Control’ and ‘motor
-
sport- derived
gearshift strategy’
functions (p. 62).
In essence, PDK combines
sportiness with ef ficiency and
comfort. What does all this
mean for you? Exactly what you
would expect: uninterrupted
driving pleasure.
Porsche Doppelkupplung (PDK)
in detail.
The crankshaf t transmits engine
torque to the dual-mass fly wheel
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 rapid gearshif ts with no
interruption in the flow of power,
which result in a considerably
faster rate of acceleration for the
same rate of fuel consumption.
The advantage over a fully
automatic transmission is the

perceptible increase in driving
dynamics – with a similar level of
comfort, and a distinct reduction
in fuel consumption.
with input shaft 1. The torque is
now transmit ted through the
dif ferential 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 shaf t 2 The compact dimensions of the
gearbox reduce rotational masses
which means that the engine
response is more direct and the
system is more light weight.
This, along with the long-ratio 7th
gear, helps to achieve relatively
low fuel consumption and

emission figures comparable
with those of a manual gearbox.
With the optional Sport Chrono
Cayman | Drive

5253
Spor tDesign steering wheel with gearshif t paddles
Sports steering wheel with gearshif t switches Gear selector for PDKGear lever in carbon
A display on the lef t and right
steering wheel spokes tells you
whether the SPORT, SPORT PLUS
and Launch Control functions of
the optional Sport Chrono Package
are activated. Another feature
reminiscent of the world of motor-
spor t is the top centre marking
on the steering wheel rim.
Gear selector for Porsche
Doppelkupplung (PDK).
The gear selector for PDK
impresses not only with its unique
design, but above all with its
superior functionality enabling you
to change gear manually: press wheels for approximately t wo
seconds once the footbrake is
released. The vehicle is therefore
temporarily prevented from rolling
backwards. Brake pressure is
reduced if, within t wo seconds,
sufficient revs have been gener
-
ated by the driver depressing
the accelerator pedal (or, in the
case of manual transmission, the
accelerator pedal is depressed
and the clutch is engaged).
Sports steering wheel.
In conjunction with the optional
Porsche Doppelkupplung (PDK),
the standard sports steering wheel
has t wo ergonomic switches.
One press with the thumb and PDK
shif ts up. One pull with the index
finger and PDK shif ts down. When
combined with one of the optional
Sport Chrono Packages (p. 62),
there is an additional display
above the airbag module. It tells
you whether the SPORT, SPORT
PLUS and Launch Control func -
tions are activated. forwards to shift up, pull back
-
wards to shift down.
Even if the gear selector is set
to automatic mode, you can still
change gear manually using the
switches or gearshif t paddles on
the steering wheel.
Six-speed manual gearbox.
Fit ted as standard in each of the
Cayman models is a six-speed
manual gearbox. The shift throw is
short and precise, the tuning is
sport y – as befits the character of
the Cayman models. The dual-mass
fly wheel minimises engine noise
SportDesign steering wheel.
Visually, this steering wheel is
distinguished by its high-qualit y t win-
spoke design and silver-coloured
galvanised spoke cover. The airbag
module is finished in the same
colour as the steering wheel rim.

This optional steering wheel allows
you to make motorsport-st yle gear
changes. In conjunction with the
optional PDK, the SportDesign
steering wheel features t wo alloy
shift paddles ergonomically located
behind the steering wheel spokes.
Pull the right-hand paddle and the
PDK shifts up. Pull the left-hand
paddle and the PDK shifts down.
and the control cable mechanism
prevents vibrations from being
transmit ted to the gear lever.
Hill-start assist.
Hill-start assist comes as standard
for manual and Porsche Doppel
-
kupplung (PDK) transmissions.
It assists the driver in making a
comfortable, smooth and roll-free
start on an incline.
The system automatically detects
that the vehicle has been braked
to a halt on an incline. Provided
a gear is engaged, the brake
pressure is maintained at all four
Cayman | Drive