2010 PORSCHE BOXSTER S differential

· 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

· 54 ·· 55 ·
Boxster | Chassis
Compression in ‘Normal’ mode –
working piston and bypass, sporty-
comfortable tuning Rebound in ‘Spor t ’ mode –
working piston only, sporty-
comfortable tuning Rebound in ‘Spor t ’ mode –
working piston only, sporty-
hard tuning
Compression in ‘Normal’ mode –

working piston and bypass, sporty-
hard tuning
Porsche Active Suspension
Management (PASM).
The optional PASM is an elec -
tronic damping control system.
On the Boxster models, the
suspension has been tuned to
match the high power of the
engine. PASM actively and con -
tinuously regulates the damping
force for each wheel according
to the road conditions and driving

st yle. In addition, the suspension
is lowered by 10 mm.
The driver can select bet ween
t wo dif ferent modes: ‘Normal’
which is a blend of performance
and comfort, and ‘Sport ’ where
the setup is much firmer. The
PASM control unit evaluates the
driving conditions and modifies
the damping force on each of
the wheels in accordance with
the selected mode.
Sensors monitor the movement
of the vehicle body, for example,
under heav y acceleration and
braking or on uneven roads. The
control unit tunes the dampers

to the optimum hardness for the
selected mode to reduce roll and
pitch still further and to increase
contact bet ween each individual
wheel and the road.
In ‘Sport ’ mode, the suspension
is set to a harder damper rating.
On uneven roads, PASM imme-
diately switches to a softer
rating within the ‘Sport ’ setup
range, thereby improving con-
tact bet ween the wheels and the
road. When the road surface
improves, PASM automatically
reverts to the original, harder
rating.
If ‘Normal’ mode is selected and
the driver’s st yle becomes more
assertive, PASM automatically
switches to a harder rating within
the ‘Normal’ setup range.
Damping becomes harder, and
driving stabilit y and road safet y
are increased.
Mechanically locking rear
differential.
Are you a fan of sport y driving?
In your spare time, do you
enjoy the occasional outing on
the racetrack? Then you
shouldn’t do without the optional
mechanically locking rear differ -
ential available in conjunction
with 18-inch or 19-inch wheels.
It further enhances the traction
of the driven rear wheels on
uneven roads and when acceler -
ating out of tight bends. Road
holding at the limits of perform -
ance is even more impressive.
The car holds its course bet ter
and so PSM intervenes less often.
In other words, sheer driving
pleasure and faster lap times.

· 62 ·· 63 ·
Porsche Ceramic Composite
Brake (PCCB).
On request, we can equip your
Boxster S with a brake system
that has already had to cope
with the harshest requirements
of motorsport: the Porsche
Ceramic Composite Brake (PCCB).

The ceramic brake discs have
a diameter of 350 mm front and
rear – for extremely powerful
braking. The brake discs are
formed from a specially treated
carbon -fibre compound that is
silicated in a high-vacuum process
at approximately 1,700 ˚C. Not
only are the resulting discs much
harder than standard discs, they are more resistant to heat.
The low thermal expansion of

the brake discs prevents defor -
mation under heav y braking.
Furthermore, the ceramic brake
discs are totally resistant to
corrosion and offer more favour -
able noise-damping properties.

Six-piston aluminium monobloc
fixed calipers on the front axle
and four-piston units at the rear
provide a high and constant
brake pressure. The pedal
response is fast and precise with
only moderate input required.
All the necessary ingredients
are there for a short braking
distance, even in the toughest
conditions. Moreover, safet y
under braking at high speeds is
increased thanks to the excel-
lent fade resistance of PCCB.
The key advantage of PCCB
is that the brake discs are
approximately 50 % lighter than
standard discs of similar design
and size. A factor that helps
to reduce unsprung and rotating
masses on the vehicle. The
consequence of this is bet ter
road holding and increased
comfort, particularly on uneven
roads, as well as greater agilit y
and improved handling.
Please note that circuit racing,
trackday use and other forms of
performance driving can signifi -
cantly reduce the service life of
even the most durable brake
pads and discs. We recommend
that all brake components be
professionally inspected and
replaced where necessary after
every track event.
Porsche Stability Management
(PSM).
PSM, which comes as standard,
is an automatic control system
that stabilises the vehicle at the
limits of dynamic driving per-
formance. Sensors continuously
monitor driving direction, speed,
yaw velocit y and lateral accel -
eration. Using this information,
PSM computes the actual direc -
tion of motion. If this direction
deviates from the desired course,
PSM initiates braking inter-
ventions targeted at individual
wheels in order to stabilise the
vehicle.

Under acceleration on wet or
low-grip road surfaces, PSM
improves traction using the ABD
(automatic brake differential)
and ASR (anti-slip regulation)
functions, giving an agile
response. When ‘Sport ’ mode is
selected on the optional Sport
Chrono Packages (p. 56), the
PSM intervention threshold is
raised to enable greater driver
involvement – particularly at
speeds of up to approximately

70 km/ h (45 mph). The integral
ABS can further reduce the
braking distance.
Boxster S Boxster SBoxster S
Boxster | Safet y

· 128 ·· 129 ·
Te r m Pa g e
A
Active safet y 60
Adaptive sports seats 74
Airbags 66, 67
Anti-theft protection 78
Audio interface, universal 86
Audio system CDR-30 82
B
Bi-Xenon headlights 65
BOSE
® Surround
Sound System 88
Boxer engine 26
Braking system 61
C
CD or CD/ DVD autochanger 87
Chassis 48
Child seats 67
Climate control 76
Colours 100
Comfort seats 74
Cruise control 76
Cylinder-specific
knock control 35
D
Direct fuel injection (DFI) 28
Dry-sump lubrication,
integrated 32
Dynamic cornering lights 65
E
Electronic logbook 85
Engine cooling 33
Engine management system
with electronic throt tle 35
Environment 90
Exclusive, Porsche 119
Exhaust emission control 93
Exhaust system 38
F
Factory collection 120
Fuel 94
H
H a rd t o p 81
Headlight cleaning system 65Heated seats
75
Heated steering wheel 73
Hill -start assist 47
HomeLink
®
Garage door opener 77
Hood 80
I
Ignition system 37
Individual equipment 98
Instruments 72
L
LED day time running lights 65
Lighting concept 64
Lightweight construction 32
Luggage compartment 79
M
Maintenance 95
Manual gearbox 47
Materials 75
N
Navigation module 84
Noise 95
O
Oil supply 32
On-board computer,
integrated 72
P
Pa rk A ssist 78
Passive safet y 66
Porsche Active Suspension
Management (PASM) 54
Porsche Ceramic Composite
Brake (PCCB) 61, 62
Porsche Communication
Management (PCM) 83
Porsche Doppelkupplung
(PDK) 42
Porsche Exclusive 119
Porsche Side Impact
Protection (POSIP) 67
Porsche Stabilit y
Management (PSM) 63, 64
R
Rear differential,
mechanically locking 54
Recycling 93
Resonance intake manifold 35
Roll-over protection 67
S
Seat ventilation 75
Service 95, 122
Servicing 39
Side windows, water- repellent 78
Six-cylinder Boxer engine 26
Sound Package Plus 87
Sport Chrono Package 56
Sport Chrono Package Plus 57
SportDesign Package 106
Sports bucket seats 75
Sports exhaust system 38
Sports seats 74
Standard seats 74
S te e r i n g 51
Steering wheels 46, 73
Storage compartments 76
T
Technical data 126
Telephone module 85
Telephone preparation 86
T V tuner 85
Tyre Pressure Monitoring
( TPM) 52

V
VarioCam Plus 36
Vehicle tracking system 79
Voice control system 85
W
‘Welcome Home’ lighting 77
W heels 52
Wind deflector 81
Wiper system 77
Index