2008 PORSCHE 911 GT2 sport mode

· 44 ·· 45 ·The 911 GT2 |
Chassis
Rear axle Front axle
The 911 GT2 chassis is designed
for racecar-like performance on
every type of tarmac from motor-
way to track. The car rides about
25 mm lower than the 911 Carrera
and its lightweight build has
reduced overall weight as well as
the unsprung masses. Agile and
responsive, it is stable and secure– particularly during cornering
manoeuvres.
The front suspension with its
special wheel mounts has
McPherson spring struts with
the wheels mounted individually
on trailing arms and wishbones.
Each front wheel is preciselylocated, ensuring excellent
handling and directional stability
in all road and track scenarios.
Brake spoiler elements provide
efficient cooling for each of the
front brake units.The rear axle assembly consists
of subframe-mounted multi-link
suspension featuring LSA con-
struction (Light, Stable, Agile).
This lightened design featuring
an aluminium cross-member
is an important factor in the
exceptional dynamics of the car.
Ride height, camber, toe angle
and anti-roll bar settings can
all be adapted to individual circuit
characteristics, as befits a racing
Porsche.There is virtually no unwanted
movement between the suspen-
sion and body, thanks to special
features such as metal bearings
with ball joints on the front strut
mounts and rigid cross-members
at the rear. This reduced elasticity
and improved wheel location
enable better handling and turn-in.
The 911 GT2 has an electronic
variable damping system as
standard – Porsche Active Suspension Management (PASM,
see page 48).
This variable
damper system offers two basic
setup modes, ‘Normal’ and
‘Sport’.
Racetrack. Motorway. Wherever the road goes.
Chassis.

· 49 · · 48 ·
The 911 GT2 |Chassis
The 911 GT2 is fitted with Porsche
Active Suspension Management
(PASM), an electronic damper
adjustment system. This active
damping system offers continuous
adjustment of individual damping
forces based on current road
conditions and driving style.
The driver can choose from two
basic setup modes: ‘Normal’ and
‘Sport’. ‘Normal’ mode is designed
for general road driving and wet
circuit use. ‘Sport’ mode enables
greater lateral acceleration and
increases traction on the race-
track.
In either mode, the system
responds to changing loads by
automatically applying the optimum
rate on each individual damper
from a range of predefined options.Various sensors are used to
monitor the movement of the body
during acceleration, braking and
cornering manoeuvres, as well as
on poor road surfaces. The PASM
control unit then evaluates this
data and modifies the damping
force on each individual wheel in
accordance with the selected
mode. The results are a reduction
in pitch and roll as well as con-
sistent road contact on all four
wheels.
If ‘Sport’ mode is selected using
the PASM button identified by a
damper symbol, the suspension is
set to a harder damper rating that
is specially designed for perform-
ance driving. If the quality of the
road surface falls below a certain
threshold, the system immediatelychanges to a softer rating within
the ‘Sport’ setup range. This
adjustment enhances occupant
comfort as well as traction and
grip. When the road surface
improves, PASM automatically
reverts to the original, harder
rating.
Rebound in ‘Sport’ mode –
damper piston with bypass
valve closedRebound in ‘Normal’ mode –
damper piston with bypass
valve open
Compression in ‘Normal’ mode –
damper piston with bypass
valve open
Compression in ‘Sport’ mode –
damper piston with bypass
valve closed
Redefining ‘normal’.
Porsche Active Suspension Management (PASM).

· 51 · · 50 ·The 911 GT2 |
Chassis
Some things never change,
including driver expectations of
a 911 GT2 : sports-oriented
performance, a direct response
and impressive power.
So Porsche Stability Management
(PSM) has been specially adaptedfor the 911 GT2. In addition to
ABS, the package includes two
automatic driver aids: stability
control (SC) and traction control
(TC).
Stability control (SC), which is
responsible for lateral dynamics,uses a range of sensors to moni-
tor the direction, speed, yaw
velocity (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 thecar begins to oversteer or under-
steer, selective braking is applied
on individual wheels to restore con-
trol in critical driving scenarios.
Traction control (TC), with its
integrated ABD (automatic brake
differential), ASR (anti-slip regula-
tion) and EDC (engine drag-torque
control) functions, is responsible
for the longitudinal dynamics of the
car. Configured for sports-oriented
driving, traction control improveshandling under acceleration on
surfaces with inconsistent grip.
It also prevents the rear from
‘stepping out’ if a wheel loses
traction under full power. The
trigger threshold is relatively high,
which means it is rarely employed
in normal dry conditions.
A unique feature of PSM on
the 911 GT2 is that the control
interventions are delayed and
can be disabled completely in
two stages – for deliberate per-
formance handling.
Stage 1 disables the stability con-
trol (SC) via the ‘SC OFF’ switch in
the centre console. In ‘SC OFF’
mode, the control system does
not intervene if the car goes off-
course in the lateral direction,
which means the throttle can
be used to help steer the car.
Traction control (TC) is still active
in this mode.
Stage 2 disables the traction con-
trol as well via the separate
‘SC+TC OFF’ switch, giving the
driver full command of the vehi-
cle. Another unique feature is the fact that stability control
remains disabled in stages 1 and
2 even when the ABS is required
under braking. Specially develop-
ed for the 911 GT2, this revised
system strategy means the car
can also be enjoyed to maximum
effect on the racetrack.
The anti-lock braking system
(ABS 8.0) is integrated in PSM
and remains active, irrespective
of which settings have been
selected. ABS ensures a relatively
short braking distance and thus
enhanced safety.
It’s good to know who’s in control.
Porsche Stability Management (PSM).

· 79 · · 78 ·
The 911 GT2 |Comfort
pairing is complete, the mobile
phone’s aerial is switched off to
conserve battery charge and the
phone operates via the car aerial.
Depending on the mobile phone
model, this gives access not only
to the numbers on the SIM card
but also to the phone’s internal
memory. Also, depending on the
phone, it can be controlled using
the PCM, the multifunction steering
wheel or the voice control system,
without it ever leaving your pocket.
Mobile phone preparation.
As an option, the mobile phone
preparation kit (with or without
cradle) is available for Bluetooth
®
connection of mobile phones
which only support the hands-free
profile (HFP). For connection by
HFP, the PCM acts merely as a
hands-free system. Here, too, the
mobile phone can remain tucked
away. Only the basic phone func-
tions can be operated using the
PCM. The GSM connection is
established via the aerial of the
mobile phone.**
Universal audio interface.
With this optional feature, the
storage compartment in the centre
console will contain three connec-
tions: one for your iPod
®, one
for a USB stick/MP3 player and
one as an AUX interface for any
chosen compatible audio source.
The iPod
®or USB stick can be
operated conveniently and safely
via the PCM, the multifunction
steering wheel or the voice control
system. The USB connection can
also be used to download data
from the performance display of
the Sport Chrono Package Plus
and the electronic logbook.
Sound Package Plus.
Fitted as standard is Sound Pack-
age Plus. A separate amplifier with
a total rated output of 235 Watts,
combined with nine speakers,
ensures a perfect sound for the
interior.
Electronic logbook.
The optional electronic logbook
allows automatic recording of
mileage, distance covered, date
and time, starting point and desti-
nation on each trip. Once you
have downloaded the logbooks
from the PCM via Bluetooth
®or
via the optional USB interface,
the data can be analysed on
your home PC using the software
supplied. The software complies
with all statutory requirements
for automatic logbooks as speci-
fied by the German revenue
authorities.
TV tuner.
A TV tuner, available as a option,
receives analogue and digital
television broadcasts (DVB-T) to
provide entertainment between
journeys. For your safety, the
TV picture cannot be displayed
while the vehicle is in motion.
Voice control system.
Almost all of the functions of the
PCM can be controlled via the
latest optional voice control sys-
tem. The menu item is read aloud
exactly as it is displayed on thescreen and the voice control
system recognises commands or
number sequences, irrespective
of the speaker. It gives audible
feedback and guides you through
the functions. There is no need to
‘train’ the system. Phone book
entries can be retrieved, a radio
station selected or the navigation
destination entered directly by
speaking whole words, rather than
dictating one letter at a time.
Telephone module.
The optional GSM telephone
module offers convenience and
excellent reception. By inserting a
SIM card directly into the PCM’s
integral SIM reader, calls can be
made using either the hands-free
facility or the optional cordless
handset. For even more conve-
nience, the Bluetooth
®capability
of a mobile phone can be used
to make calls via the SIM Access
Profile (SAP)*. Once automatic
TV tuner*/** Note: see page 97.

· 85 · · 84 ·
The 911 GT2 |Environment
Here, all technological developments
are carried out with environmental
protection in mind. The aim: pure
performance – but not at the
expense of the environment.
You can find more information
about environmental matters in the
separate brochure ‘Porsche and
the Environment’, or on our website
www.porsche.com.
Exhaust emission control.
The 911 GT2 easily meets the strin-
gent emissions standards for the
EU4 regulations in Europe and
LEV II regulations in the USA. This
demonstrates that even high per-
formance sports cars can achieve
moderate emissions values in their
respective categories. The 911 GT2
is not only one of the most power-
ful cars around, but also one of the
cleanest. One pair of sensors is
used to monitor the oxygen levels
in each of the twin exhaust tracts.
An additional pair of sensors* –
again, one on each tract – is
located downstream from the cat-alytic converters. This information
is used by the engine management
system to monitor the efficiency of
the catalysts.
Fuel.
The current Porsche sportscar
model range is already compatible
with fuels that have an ethanol
content of up to 10 %. A ‘biofuel’
made from naturally replenishing
materials, ethanol has a positive
impact on the carbon dioxide bal-
ance since the plants grown for its
production also absorb carbon
dioxide from the atmosphere.
Fuel system.
In the fuel supply system, we’ve
minimised the evaporation of
hydrocarbons. This is achieved
through a combination of active
carbon filter and special fuel-tank
coating. All fuel lines are made
from aluminium, while those
carrying vapours are made from
multi-layer plastic.
* Not featured in markets with leaded fuel.
Noise.
The 911 GT2 complies with all
noise regulations in the respective
markets. Rather than resorting
to engine encapsulation, we’ve
eliminated noise at source. All that
remains are the powerful acoustics
you’d expect from a thoroughbred
Porsche.
Servicing.
Longer service intervals are not
only easier on resources, they also
reduce ownership costs.
For service intervals of the 911 GT2,
please refer to the price list.
In an era of intensifying debate
about CO
2emissions, every auto-
motive manufacturer is considering
how to deal with the question of
fuel consumption. Our answer has
long been the same: maximum
efficiency.
Porsche reduces the CO2emissions
of its vehicles annually by an aver-
age of 1.7 %. In relation to engine
power, Porsche is already among
those manufacturers achieving the
lowest CO
2emissions. This has
been achieved through an efficient
drive concept, optimised aero-dynamics, low rolling resistance
and lightweight construction.
This high degree of environmental
responsibility is clearly demonstrated
by our approach to environmental
management at the Porsche
development centre in Weissach.
Powerful performance needn’t cost the earth.
Environment.