2010 PORSCHE BOXSTER S clutch

· 8 ·· 9 ·
· 8 · · 9 ·· 10 ·
Boxster S
Boxster in Porsche Racing Green Metallic
An extraordinarily powerful mid-
mounted engine. An extremely
low centre of gravit y. Very high
agilit y and dynamic handling.

The driving experience offered
by a Boxster goes far beyond
superficial driving pleasure. That ’s
because it ’s based on a concept
which made the 550 Spyder one
of the most successful racing
cars of its time. We see it as the
very embodiment of Porsche
Intelligent Performance.
Both models are powered by
sophis ticated engines. The

Boxster’s six- cylinder Boxer engine,
fit ted with VarioCam Plus (p. 36),
has a 2.9 -litre capacit y, 188 kW
(255 hp) and maximum torque of
290 Nm at 4,400 to 6,000 rpm.
Taking it to 100 km/ h (62 mph)
in just 5.9 seconds, with a top
speed of 263 km/ h (163 mph). Despite this increase in power,
the CO
2 emissions have been
reduced by up to 12
% compared
with the previous model. In com -
bination with the optional Porsche
Doppel kupplung (PDK), the
result is a very low emissions
value of 214 g / km and fuel
consumption of 9.1 l/100 km
(31 m pg ).
The Boxster S has an additional
power boost, with direct fuel injec -
tion (DFI, p. 28) fit ted as standard.
This provides optimum fuel mix-
ture formation for improved fuel
ef ficiency and a distinct increase
in power and torque. In combi-
nation with the optional PDK, this
gives a reduction in fuel con-
sumption of 15 % and lowers CO2
emissions by 16 % compared with
the previous model.
The pleasure of a roadster.
The excitement of a Porsche.
The Boxster models.
The 3.4-litre six- cylinder Boxer
engine in the Boxster S develops
an impressive 228 kW (310 hp).
Maximum torque of 360 Nm is
reached bet ween 4,400 and
5,500 rpm and acceleration to
100 km/ h (62 mph) takes just
5.3 seconds.

In summary, an engine which
is responsive enough to provide
power from the outset – and
reaches its limit at 274 km/ h
(170 mph).

In both models, a precision six-
speed manual gearbox makes
optimum use of the power and
torque of the engine. Available
as an option is Porsche Doppel-
kupplung (PDK, p. 42) featuring
both manual and automatic
modes.
The principle is as impressive
as it is simple: it has seven
gears, t wo half gearboxes and
t wo clutches. As one gear is
engaged, the next is already
preselected in the other half
gearbox.
Gear changes take place in milli
-
seconds without any interruption
in the flow of power. The advan -
tage over a fully manual trans
mis -
sion is the considerably faster

rate of acceleration for the same
level of fuel consumption. The
advantage over a fully automatic
transmission is a perceptible
increase in driving dynamics –
with a similar level of comfort
and a distinct reduction in fuel
consumption. In short, Porsche
Doppelkupplung (PDK) not only increases the agilit y of the

Boxster but also enhances
driving pleasure.
As you would expect, the chas-
sis setup ensures a supremely
sport y ride. A wider track and
generously dimensioned wheels
in a dynamic design provide an
even sportier driving experience.
The optional mechanically locking
rear dif ferential (p. 54) delivers
high traction and increased per -
formance.
When fit ted in combination with
PDK, the optional Sport Chrono
Package (p. 56) gives you access

to t wo further functions: ‘Launch
Control’ for maximum accelera -
tion from a standing start, and
a ‘motorsport-derived gearshift
strategy’, bringing gearshift
characteristics straight from the
racetrack.
Boxster | The Boxster concept

· 42 ·· 43 ·
The optional Porsche Doppel-
kupplung (PDK), with both man -
ual gearshift 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

For people who have no time to spare.
Even when changing gear.
Porsche Doppelkupplung (PDK).
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.
This double clutch provides an
alternating, non-positive connec -
tion bet ween the t wo half gear -
boxes 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 con
-
ventional 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,
Boxster | Drive
which contains the even gears
(2, 4, 6).
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.
4
6
2
1
R
7 3
5
Porsche Doppelkupplung (PDK)
Boxster S

· 44 ·· 45 ·
Under oil pressure, clutch 1
closes and forms a frictional
connection with input shaf t 1.
The torque is now transmit ted
through the first half gearbox
– and then the dif ferential – to
the rear axle. At this stage,
PDK has already preselected
the next gear in the second
half gearbox. Engine torque
is already acting on the other
outer disc carrier and, in
response to a gear change
signal, the overlap shift is initi -
ated, i.e. as clutch 1 opens,

clutch 2 closes. The non-positive
connection with input shaft 2
is
established, and power is
trans
mit ted 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
sport y handling and takes place
in a mat ter of milliseconds.

The advantage over a fully manual
transmission is the considerably
faster rate of acceleration for the
same rate of fuel consumption.
Boxster | Drive
The advantage over a fully auto -
matic transmission
is the per -
ceptible increase in driving
dynamics – with a similar level of
comfort, and a distinct reduction
in fuel consumption.
The com -
pact dimensions of the gearbox
reduce rotational
masses which
means a more direct engine
response, and the system is
more lightweight.
PDK function diagram
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 gearshif t strategy’
functions (p. 57). In essence, PDK combines sport
i
-
ness with efficiency and comfort.

What does all this mean for you?
Uninterrupted driving pleasure.
Multi-plate clutch 1
Multi-plate clutch 2
Semi -gearbox 2
(2nd, 4th, 6th gear)
Rear semi-gearbox 1
(1st, 3rd, 5th, 7th, R gear)
Differential
Motor
Rear wheel
Rear wheel
Boxster

· 46 ·· 47 ·
Three-spoke sports steering
wheel with gearshift switches.
In conjunction with the optional
Porsche Doppelkupplung (PDK),
the standard three-spoke sports
steering wheel features t wo
ergonomic switches. One press
with the thumb and the PDK
shif ts up. One pull with the index
finger and the PDK shif ts down.
Either the right or left hand can
be used.
When combined with the optional
Sport Chrono Packages (p. 56),
an additional display is located
above the airbag module telling you whether the SPORT, SPORT
PLUS and Launch Control func
-
tions are activated.
Three-spoke sports steering
wheel with gearshift paddles.
If you wish, you can now change
gear motorsport-st yle. The
paddles are made from a strong
alloy and are ergonomically
located behind the steering wheel
spokes. Pull the right-hand paddle
and the PDK shif ts up. Pull the
left-hand paddle and the PDK
shifts down.
Visually, the steering wheel is
distinguished by its distinctive,
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.
Displays in the left and right-
hand steering wheel spokes tell
you whether the SPORT, SPORT
PLUS and Launch Control func -
tions are activated. Another

feature reminiscent of the world
of motorsport is the top centre
marking on the steering wheel
rim.
Boxster | Drive
Gear selector for PDK.
The gear selector for PDK im-
presses not only with its unique
design, but above all with its
superior functionality enabling
you to change gear manually.

Press forwards to shift up, pull
backwards to shift down. Even if
the gear selector is set to auto -
matic mode, you can still change
gear manually using the switches
on the steering wheel.
Six-speed manual gearbox.
Fit ted as standard is a six-speed
manual gearbox which is per -
fectly matched to the character -
istics of the engine. The shif t
throw is short and precise, the
tuning is sport y – as befits the
character of the Boxster models.
The dual-mass fly wheel mini -
mises engine noise and the con -
trol cable mechanism prevents
vibrations from being transmit ted
to the gear lever.
Three-spoke sports steering wheel with gearshift switches Three-spoke sports steering wheel with gearshift paddles Gear selector for PDKGear lever for six-speed gearbox
Hill-start assist.
Standard for manual and Porsche
Doppelkupplung (PDK) transmis-
sions it assists the driver in
making a comfortable, smooth
and roll-free start on an incline.
The system detects you have
braked to a halt on an incline.

Provided a gear is engaged, the
brake pressure is maintained
approximately t wo seconds once
the footbrake is released. The
vehicle is therefore temporarily
prevented from rolling backwards.
Brake pressure is reduced if
sufficient revs have been gener -
ated depressing the accelerator
pedal (for manual transmission,
the accelerator pedal is de-
pressed and the clutch engaged).

· 56 ·· 57 ·
Sport Chrono Package.
The Boxster combines open -top
driving with performance which
at Porsche has its origins on the
racetrack.
As an option, for both models we
offer the Sport Chrono Package
which enables even sportier tuning
of the chassis and engine and
guarantees even more driving
pleasure.
Selecting the SPORT but ton

on the centre console activates
‘Sport ’ mode, which makes
throt tle the response significantly
more immediate, adjusts the
rev-limiter to a harder set ting,
and tunes the engine dynamics
for performance driving.
The optional Porsche Active

Suspension Management (PASM)
also switches to ‘Sport ’ mode,
which of fers harder damping and
more direct steering and, there-
fore, bet ter road holding.

With the optional PDK in auto -
matic mode, gearshif t points are
delayed until the upper rev range.
The shif t times are shorter, the
gear changes sportier. At low rates
of deceleration, the system
initiates a swif ter, brake-induced
downshift. In manual mode, gear
changes are faster and more
dynamic.
In ‘Sport ’ mode, the PSM (p. 63)
intervenes later for increased
longitudinal and lateral dynamics.
PSM now affords greater
manoeuvrabilit y under braking
and exit acceleration, especially
at low speeds.
For maximum dexterit y, PSM can
be set to standby while the car is
still in ‘Sport ’ mode (p. 63). For
safet y, it is set to intervene auto -
matically only when ABS assist -
ance is required on both the front
wheels.
A key component of the Sport
Chrono Package is the swivel-
mounted in the centre of the
dashboard with analogue and
digital display.
In combination with the optional
Porsche Doppelkupplung (PDK),
the Sport Chrono Package of fers
t wo additional functions that
are activated by the SPORT PLUS
but ton.
First, ‘Launch Control’, which
ensures you achieve the fastest
possible rate of acceleration
from a standing start – on the
race track, for example. ‘Launch
Control’ is operated via the
SPORT PLUS but ton with the ‘D’
or ‘M’ drive position selected.
Whilst the driver depresses the
brake pedal with the left foot,
the right foot depresses the
accelerator pedal to the floor.
With the accelerator in the kick -
down position, the system
detects the driver’s request for
Launch Mode and revs the
engine to an optimum speed of
approximately 6,500 rpm.
Boxster | Chassis
Engine torque increases and the
clutch closes slightly. The mes -
sage ‘Launch Control ’ appears
in the display on the PDK steer -
ing wheel. The driver now quickly
releases the brake – and pre -
pares for maximum acceleration.

Second, the ‘motorsport- derived
gearshif t strategy’. Using this,
PDK is geared up for maximum
shif t speed, the shortest possible
shif t times and optimum shif t
points for maximum acceleration
– ideal for the racetrack.
Sport Chrono Package Plus.
On request, the optional Porsche
Communication Management
(PCM, p. 83) can be combined
with the Sport Chrono Package
Plus. In addition to the functions
of the Sport Chrono Package,
it includes a personal memory
function in the PCM and a per-
formance display for evaluating
lap times.
Throttle response
in ‘Normal’ mode
Throttle response

in ‘Sport’ mode
Both sets of characteristics
are dependent on engine
speed.
Pedal travel (%)
(%)
Torque
(as percentage of maximum)
Sport Chrono stop watch
Comparison of electronic and throttle maps for ‘Normal’ and ‘Sport’ mode
‘SPORT’ but ton and ‘SPORT PLUS’ but ton on centre console