ESP PORSCHE 911 2009 5.G Information Manual

Porsche Doppelkupplung (PDK).
Derived from motorsport, PDK,
which is standard for 911 Turbo S
models and optional for 911 Turbo
models, achieves one thing
above all else: it provides the
perfect balance bet ween uncom -
promisingly dynamic performance
and exceptional levels of comfort.
It ’s purely about point of view.
The driver’s especially.
PDK, with both a manual and an
automatic mode, enables
extremely fast gear changes with
no interruption in the power flow.
For improved acceleration and significantly lower fuel consump
-
tion – without having to dispense
with the advantages of an auto -
matic.
The driver experiences a sportier,
even more dynamic drive with
more agilit y. Depending on driving
st yle, gear changes range from
exceptionally comfortable to
exceptionally sport y.
Manual gear changes are per -
formed using PDK’s ergono-
mically
designed gear lever or
alternatively, on the 911 Turbo
models, using the switches on
the three-spoke sports steering
wheel: nudge forwards to change
up, pull back to change down.
Fit ted as standard on 911 Turbo S
models and available as an option
for 911 Turbo models is the three-
spoke sports steering wheel
with gearshif t paddles, which is
also capable of operating PDK.
With its motorsport-derived gear -
shif t logic, you pull the right-hand
paddle to shift up and pull the
left-hand paddle to shift down.
PDK has been specially tuned
to the characteristics of the
911
Turbo models and the new
911 Turbo S models. It has seven
gears at its disposal. Gears 1 to 6
have a sports ratio, with the top
speed being reached in 6th gear.
The 7th gear has a long ratio and
helps to reduce fuel consumption
even further.
PDK is essentially t wo half-
gearboxes in one and thus
requires t wo clutches –
designed as a double wet
clutch transmission.
The principle is simple: the
transmission ensures that
the extraordinary engine
power isn’t manifested as a
blaze of noise and smoke.
Unless that’s what you really
want.
Calm. Storm. Which way
round is up to you.
Transmission.
Porsche Doppelkupplung (PDK) gear selector Power flow in 1st gear
Power flow in 2nd gear
Performance | Transmission
· 42 ·· 43 ·

Porsche Traction Management
(P TM).
Genuine high per formance calls
for more than just a power ful
engine. It also requires an ef fec-
tive means of delivering that
power to the road. One solution
to this is all -wheel drive. An
even bet ter one is the further-
enhanced Porsche Traction
Management (PTM), consisting

of active all -wheel drive with
electronically controlled multi -
plate clutch and including an
automatic brake differential (ABD)
and anti -slip regulation (ASR).
PTM improves vehicle dynamics
even further whilst ensuring that
none of the customar y traction
and driving safet y is lost. The
result is an even more enjoyable
sport y ride combined with
exceptional stability.
Torque is distributed actively
– and exceptionally quickly –
via an electronically controlled
multi-plate clutch. The advantage is that, through
continuous monitoring of the

driving conditions, a more imme -
diate response to changing
scenarios can be achieved. The
status is monitored with the aid
of on-board sensors. These are
used to measure a range of

values, including the rotational
speed of all four wheels, the
lateral and longitudinal accelera -
tion of the car, and the current
steering angle. The sensor data
is analysed in ‘real time’, enabling
immediate adjustments in front-
end drive torque as and when
required. If, for example, the rear
wheels lose traction under
acceleration, a greater proportion
of drive torque is automatically
transmit ted to the front axle. At
the same time, ASR prevents the
rear wheels from spinning by
adapting the engine power. When
cornering, the system controls
drive to the front wheels in order
to maintain optimum lateral grip.
On variable-grip surfaces, traction
is enhanced using the automatic
brake dif ferential (ABD). If a wheel threatens to spin, PTM brakes it
via ABD and in doing so transfers
more drive torque to the other
wheel on the same axle.
Assisting PTM is Porsche Stabilit y
Management (PSM). Combined,
these systems provide excellent
torque distribution – and there
-
fore outstanding performance –
in all driving conditions.
The benefits of PTM are most
evident in wet and snow y
conditions. In these conditions,
the 911 Turbo models of fer
breathtaking acceleration. In short, PTM provides greater
active safet y and greater

performance, combined with
exemplary balance.
Performance | Transmission
Active all -wheel drive
· 48 ·· 49 ·

Porsche Torque Vectoring (PTV).
Porsche Torque Vectoring (stand-
ard on 911 Turbo S models,
optional for 911 Turbo models), with variable torque distribution
to the rear wheels and a mechan
-
ical limited-slip rear differential,
is a system that actively enhances
vehicle dynamics and stabilit y. As a function of steering angle
and steering speed, accelerator
pedal position, yaw rate and

vehicle speed, PT V is able to
improve steering response and steering precision significantly

by specific braking of the right or
left rear wheel.
In simple terms, this means that
when the car is driven assertively
into a corner, moderate brake
pressure is applied to the inside
rear wheel. Consequently, excess
drive force, which varies depend -
ing on the braking force applied
to the inside rear wheel, can be
distributed to the outside rear
wheel, and a rotational pulse (yaw
movement) is generated around
the vehicle’s vertical axis. This
assists the steering input and
results in a more assured steering
manoeuvre.
At low and medium vehicle
speeds, the system significantly
increases agilit y and steering
precision, whilst at high speeds,
and in combination with the
mechanical limited-slip differential,
it additionally ensures greater
driving stabilit y. The system, combined with

Porsche Traction Management
(PTM) and Porsche Stabilit y
Management (PSM), also puts

its stabilising ef fect to good use
on road surfaces with varying
levels of grip and on snow and ice.
As PT V increases the car’s
dynamic performance, the system
remains active when driving
on the racetrack, even if PSM
has been deactivated.
Where
efficien cy is concerned,
this
enhanced performance and
stabilit y are achieved without the
need for any additional compo -
nents, apart from the mechanical
limited-slip rear differential. In
other words, a more enjoyable
drive with no additional weight.
Performance | Transmission
· 50 ·· 51 ·

The independent front suspension
combines McPherson-type struts
with longitudinal and transverse
links. Each front wheel is pre-
cisely located, ensuring excellent
handling and directional stabilit y. Proven in motorsport, the rear
axle assembly features multi-link
LSA (Light weight, Stable, Agile)
subframe-based suspension. Its
light weight construction of fers
excellent dynamic properties. The
axle kinematics improves stabilit y
under acceleration by reducing excessive compression. The light
-
weight strut has an aluminium
damper instead of conventional
steel to help improve handling
and agility.
The resulting suspension enables
smooth high -speed manoeuvres
in all road and track scenarios.
Pitch and roll are reduced to a
minimum, as are t yre noise and
vibration. The car offers excep -
tionally high levels of stabilit y.

Porsche Active Suspension
Management (PASM).
Included as standard equipment,
Porsche Active Suspension
Management (PASM) is an elec -
tronic active damping system.
It of fers continuous adjustment of
the damping force on each wheel,
based on current road conditions
and driving st yle.
At the press of a but ton, the
driver can choose bet ween t wo modes. While ‘Normal’ mode

provides a blend of performance
and comfort, the ‘Sport ’ setup
mode has a much firmer range of
set tings. The system responds
to changing road conditions and/
or driving st yle by continuously
varying the individual damping
forces within the parameters
defined for the selected setup
mode (‘Normal’ or ‘Sport ’).

Pitch and roll are reduced, whilst
contact of each wheel with the
road is optimised.
What’s the advantage of being well-balanced?
Not letting the smallest thing bother you.
Chassis.
Perhaps the most efficient
way of overcoming everyday
obstacles is to rely on one’s
own experience. No one
knows that better than our
own chassis engineers.
Front axle (911 Turbo) Rear axle (911 Turbo)
Performance | Chassis
· 52 ·· 53 ·

Porsche Stability Management
(PSM).
PSM, an automatic vehicle sta-
bilit y control system designed to
aid the driver in critical road
scenarios, is fit ted as standard.
Sensors monitor the direction,
speed, yaw velocit y (speed of
rotation around the vertical axis)
and lateral acceleration of the car.
Using this information, it is
possible to calculate the actual
direction of travel at any given
moment. If the car begins to over -
steer or understeer, PSM applies
selective braking on individual
wheels to restore stabilit y and
optimum speed. Whenever PSM is
required to intervene, an indicator
light in the cockpit flashes.
When accelerating on wet or other
low-grip surfaces, PSM combines
with PTM and uses the automatic
brake differential (ABD) and anti-
slip regulation (ASR) functions to
maintain traction and stabilit y.
Included as standard equipment,
PSM assists with high -precision
inputs that enhance the agilit y of
each model. When ‘Sport ’ mode is selected on the Sport Chrono
Package Turbo with dynamic
engine mount system (page 58),
the PSM threshold is raised

higher still to enable greater
driver involvement – particularly
at speeds of up to 70 km/ h
(44 mph).
PSM includes ABS to help mini -
mise braking distances. System
inputs are smooth and precise
for greater driver comfort.
Active safet y is further enhanced
with the aid of t wo additional
brake functions: electronic brake
prefill and brake assist.
The prefill function is automati-
cally enabled whenever the

throt tle pedal is suddenly released.
The pressure in the brake lines
is marginally increased, bringing
each of the pads into light contact
with the corresponding disc. If
the driver then decides to use the
brakes, the system can apply
the maximum force with virtually
no delay.
The brake assist function, by
contrast, is specifically designed
for use in emergency stops.
When the speed of brake pedal
application and the pressure on
the brake pedal exceed a prede -
fined threshold, the hydraulics
automatically apply the necessary
pressure to achieve maximum
deceleration. For a more actively involved

driving experience, PSM can be
manually disabled. PSM remains
present in the background and
will only intervene under heav y
braking where at least one front
wheel requires ABS assistance
(in ‘Sport ’ mode, if both front
wheels require assistance). The
automatic brake differential

(ABD) remains active at all times.
Vehicle yaw
Car steers of f line
Vehicle yaw
Car steers of f line PSM corrects
direction and
stabilises car
PSM corrects
direction and
stabilises carOversteer without PSM
Oversteer with PSM
Understeer with PSM
Understeer without PSM
Performance | Chassis
· 56 ·· 57 ·

Sport Chrono Package Turbo
with dynamic engine mount
system.
The Sport Chrono Package Turbo
with dynamic engine mount
system is standard on 911 Turbo S
models and available as an
option for 911 Turbo models.

This integrated system provides
simultaneous enhancement for
engine, chassis and transmission.
Key features include a digital
and analogue stopwatch on the
dashboard, a performance dis -
play, a personal memor y function
in the Porsche Communication
Management (PCM), the SPORT
but ton and – in combination with
PDK – the SPORT PLUS but ton,
and an additional display on the
steering wheel which informs the
driver if the SPORT but tons and Launch Control have been acti
-
vated. The 911 Turbo models
additionally of fer the ‘overboost ’
function. This is how it works:
When ‘Sport ’ mode is selected,
the engine management system
creates a much more aggressive
response to pedal inputs. To do
this, it implements an alternative
throt tle map which relates the
pedal position in the foot well to
a wider angle of opening in the
throt tle body. In higher gears, it
uses a hard rev- limiter to protect
the engine under power.
In the 911 Turbo models, under
full acceleration, the maximum
boost pressure in the lower and
medium speed ranges is now
temporarily increased by approx -
imately 0.2 bar. As a result,
engine torque is boosted by 50 Nm to a maximum of 700 Nm for a
limited period. (The 911 Turbo S
models are configured to operate
with a higher boost pressure level,

which means that their maximum
torque is always 700 Nm.)
In addition to the engine, ‘Sport ’
mode is enabled in the standard
Porsche Active Suspension
Management (PASM) suspension.
The dampers become firmer,
enabling faster turn - in as well as
bet ter contact with the road.
In automatic mode of PDK,
the basic gearshif t pat tern is
switched to high-performance
mode. The gear change action is
virtually instantaneous, while the
shift points are timed for maxi -
mum acceleration. Lif t of f the
throt tle – even at high revs – and
the system automatically shif ts
down to apply engine braking. In
manual shif t mode, gear chang -
ing is faster and more dynamic.
Porsche Stabilit y Management
(PSM) is also adapted, with the
intervention threshold raised. As
a result, the car has a more natu -
ral response to lateral and longi -
tudinal forces. Cornering agilit y
is greatly enhanced, when both braking to turn in and applying
power on exit – particularly

in low-speed bends. For even
greater driving pleasure.
For maximum manoeuvrabilit y,
PSM can be partially disabled
while the car is still in ‘Sport ’
mode. PSM simply monitors the
forces acting on the car and
will only intervene in the most
critical scenarios, e.g. when ABS
assistance is required on both
front wheels.
In conjunction with PDK (standard
on 911 Turbo S models), the
Sport Chrono Package Turbo with
dynamic engine mount system
has t wo additional functions that can be activated via the SPORT
PLUS but ton, for a sport y drive
that borders on a motorsport
experience.
The first function is ‘Launch
Control’, which, for example
when per forming laps, helps you
achieve optimum acceleration
from a standing start, a racing
start in other words.
The function works like this:
press the SPORT PLUS but ton
when the transmission is in ‘D’
or ‘M’. Then, with your lef t foot,
press the brake pedal and accel -
erate fully with the right foot.
The car recognises ‘Launch’ mode
from the accelerator kickdown action and adjusts the engine
speed to the optimum level,
which is around 5,000 rpm. At
the same time, boost pressure
is increased to approximately

0.5 bar, engine torque is
increased and the clutch is
applied lightly. ‘Launch Control’
now appears in the steering
wheel display. Now release the
brake as quickly as you can –
and feel the acceleration power
unleashed to the road.
Steering wheel display with PDK and Sport Chrono Package Turbo
Performance | Chassis
· 58 ·· 59 ·

Responsibility
· 62 ·· 63 ·

Headlights.
The Bi-Xenon headlight system is
fit ted as standard. The brightness
of the lights is approximately
t wice as great as that of conven-
tional halogen lights. Light output
is improved and the road illu -
minated more uniformly on both dipped and main beam, helping
to minimise driver fatigue.
Also included is dynamic range
control to prevent hazardous
dazzling of oncoming vehicles
due to undulations in the road
or the loading of the car. A head -
light cleaning function is also
incorporated.
Dynamic cornering lights
(standard on 911 Turbo S models,
optional for 911 Turbo models)
of fer particularly ef fective
illumination of the road ahead,
especially through bends. Sen -
sors continuously monitor the
speed, lateral acceleration and
steering lock and, from these
variables, calculate the course
of the bend. This determines
the angle of illumination for the
dipped beam lights, up to a
maximum of 15 degrees. On

t wisting roads, this means the
course of the road and obstacles
can be seen earlier by the driver.
Lighting concept.
The lighting concept also benefits
from the latest technology, in the
form of high -performance LEDs
for the horizontal front indicators
and also for the separate day time
running lights, the taillights and
the third brake light in the rear
wing.
In addition to the distinctive look
that makes the car very recog -
nisable, the lighting also provides
high illuminating power. The brake
lights also respond very quickly,
meaning that following traf fic is
alerted sooner. Plus the lighting
saves energy, is environmentally
sound and has a longer service
life in comparison to conventional
bulbs.When the vehicle is opened or
closed using the key remote, the
‘Welcome Home’ lighting function
automatically switches on the
LED day time running lights.
Two additional lights inside each
door ensure you see and are seen
bet ter when get ting into and out
of the car.
One effective way of relaxing:
breathe steadily.
Safety.
Quickening pulses whilst
simultaneously creating
calm. Yet another apparent
contradiction typical
of the performance of the
911 Turbo concept.
Dynamic cornering lights
Responsibility | Safet y
· 64 ·· 65 ·

Brakes.
On a 911 Turbo, there is one thing
above all else that both the accel-
erator and brake pedals deliver
when you press them – and that ’s
excitement.
The standard braking system of
the 911 Turbo models features
six-piston fixed calipers at the
front and four-piston fixed calipers
at the rear. The red-painted calipers have a
monobloc (one-piece) aluminium
construction of fering greater

stabilit y, bet ter ‘bite’ characteris -
tics under heav y braking and a
further reduction in unsprung
weight. The brakes are quick to
apply and release, whilst the
pedal travel is short and the bite
point precise and consistent.
The front and rear discs have a
generous diameter of 350 mm.
All four discs are cross- drilled for
bet ter performance in the wet.
The distinctive drill-hole pat tern
enables a faster response by
allowing rapid dispersal of the
water vapour generated under
braking.
The discs are also internally
vented for bet ter heat dispersal.
The result: excellent stabilit y in
all conditions. Cooling air is
directed onto the brakes to further
improve performance. A powerful
9-inch tandem brake booster unit
enables easier pedal inputs.
Braking distances are further
reduced with the aid of t wo
functions in the standard Porsche
Stabilit y Management (PSM):
electronic brake prefill and brake
assist (page 57). The new 911 Turbo S models
come equipped with the Porsche
Ceramic Composite Brake (PCCB,
see following pages) as standard.
Standard front brake (911 Turbo)
Responsibility
| Safet y
· 66 ·· 67 ·

Porsche Ceramic Composite
Brake (PCCB).
The new 911 Turbo S models are
equipped as standard with a
braking system that has already
proved it can withstand even
the toughest racing conditions,
such as those encountered in
the Porsche Mobil 1 Supercup.
That system is the Porsche
Ceramic Composite Brake
(PCCB). PCCB is available as an
option for 911 Turbo models. The ceramic discs have a dia
-
meter of 380 mm at the front and
350 mm at the rear. The discs
are made from a specially treated
carbon -fibre compound that is
silicated in a high -vacuum process
at 1,700 °C. The resulting mate -
rial
is not only much harder than
metal, it is also more resistant to
heat.
Even at high temperatures,
the thermal resistance of the

PCCB disc ensures excellent
dimensional stabilit y. The ceramic
material is totally resistant to
corrosion and offers excellent
acoustic damping properties.
The pads are mounted in six-
piston monobloc aluminium fixed
calipers at the front, with four-
piston units at the rear. The
resulting brake forces are both
extremely high and remarkably
consistent. The pedal response is
fast and precise with only moder -
ate input required.
PCCB enables shorter braking
distances in even the toughest
road and race conditions. Excel -
lent fade resistance ensures
greater balance when slowing
from racetrack speeds.
The key advantage of PCCB is
the total weight saving of approximately 50
% over metal
discs with similar construction
and dimensions. As well as
enhancing performance and fuel
economy, this represents a major
reduction in both the unsprung
and rotating masses. This,
of course, produces additional

benefits in terms of comfort
and road-holding on uneven
road surfaces as well as general
handling and agilit y.
Please note that circuit racing,
trackday use and other forms of
performance driving can signi -
ficantly reduce the service life of
even the most durable pads and discs. As with conventional high-
performance braking systems,

we recommend that all brake
components be professionally
inspected and replaced where
necessary after every track event.
PCCB
Responsibility | Safet y
· 68 ·· 69 ·