2008 PORSCHE 911 GT2 fuel type

· 15 · · 14 ·The 911 GT2 |
The 911 GT2
Drive is transmitted through a pre-
cision six-speed manual gearbox.
Rear-wheel drive provides driving
dynamics that are similar to those
of a racing car. In the 911 GT2,
Porsche also uses a special system
for conventional manual transmis-
sion: the Launch Assistant (see
page 38) – for maximum accelera-
tion from a standing start.
For a sporty but still comfortable
drive, particularly for this type of
sportscar, the standard suspension
features variable damping providedby Porsche Active Suspension
Management (PASM, see page 48).
This active damping system offers
a wide range of benefits including
greater performance and comfort.
Also standard is Porsche Stability
Management (PSM, see page 50).
For the first time, the integrated
control systems for lateral and lon-
gitudinal dynamics, stability control
(SC) and traction control (TC) can
be fully disabled in two stages for a
more natural drive. This means thecar can also be enjoyed to maxi-
mum effect on the racetrack.
The one-piece 19-inch GT2 alloy
wheels of the 911 GT2 are fitted
with road-legal sports tyres as
standard. In size 325/30 ZR 19 on
the rear, these are 20 mm larger
than on the 911 Turbo. The special
tread and compound enable
tremendous lateral acceleration
and higher cornering speeds as
well as precision handling and
turn-in characteristics on either
road or racetrack. A range ofsetup options is available for
racing use, including ride height,
camber, toe angle and front/rear
anti-roll bars.
Developed in motorsport, and
standard on the 911 GT2 is the
Porsche Ceramic Composite
Brake (PCCB, see page 58).
The discs are made from specially
treated carbon fibre and are
approximately 50 % lighter than
comparable metal alternatives.
The results: better brake perfor-mance, greater agility and lower
fuel consumption.
Sports bucket seats (see page 72)
with folding backrest, integral
thorax airbag and manual fore/aft
adjustment, are fitted as standard.
A perfect driving position is essen-
tial in a car with the performance
potential of the 911 GT2. The latest
Porsche Communication Manage-
ment (PCM, see page 76) is also
fitted as standard. This features
a new 6.5-inch touchscreen for
intuitive control.We believe that you don’t have
to exploit the full potential of
the 911 GT2. But you may well
choose to.

· 29 · · 28 ·
The 911 GT2 |Drive
turbine has a lower mass, it
responds more quickly to increas-
ing pressure, spinning up easily
to its optimum speed. The key
disadvantage of using a smaller
turbo is that the back-pressure
generated at higher engine speeds
causes a significant reduction
in performance. Resistance is
caused by the smaller cross-
sectional area through which
the exhaust is required to flow.
On a conventional turbocharger,
the exhaust flow drives a turbine
that is connected to a compressor
on the intake side. By compressing
the incoming air, the amount
of oxygen in a given volume is
increased. Since compression also causes an increase in
temperature, the air must be
cooled in a device known as an
‘intercooler’. With more oxygen
present in each cylinder charge,
more fuel can be burnt, yielding
greater energy. Since higherexhaust pressures generate
greater loads on the intake side,
the intake pressure must be
carefully controlled in order to
protect the engine. This ‘boost
pressure’ is limited using ‘waste-
gate’ valves that bypass excess
pressure around the turbine.
Another important factor in
the system is the size of the
turbocharger. Since a smaller Porsche has a long and celebrated
tradition of using turbocharged
power on both road and track.
On the 911 GT2, we’ve
enhanced
this technology with Variable Turbine
Geometry (VTG).Larger turbo units, which create
lower back-pressure at higher rpm,
take considerably longer to spin
up under power due to the large
cross-sectional area and relative
inertia of the heavier turbine.
Generally, this type of turbo will
only be effective in the medium
rpm range. This phenomenon,
known as ‘turbo lag’, means there
is virtually no turbocharging
effect at lower engine speeds.
Turbocharger with Variable Turbine Geometry (VTG)
Breathe easy – when holding your breath.
Variable Turbine Geometry (VTG).

· 31 · · 30 ·
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The 911 GT2 |Drive
1. Turbine casing
2. Movable guide vanes
3. Turbine wheel
4. Electric motor for guide
vane adjustment
5. Guide vane adjuster
6. Compressor casing
7. Compressor wheel
8. Recirculation valve
9. Oil inlet
10. Coolant inlet
Guide vanes open Guide vanes closed
Guide vanes open Guide vanes closedTurbocharger guide vane adjuster
To overcome this problem, the
twin water-cooled turbochargers
on the 911 GT2 feature Variable
Turbine Geometry (VTG). With
this technology, the gas-flow
from the engine is channelled
onto the turbines via electronically
adjustable guide vanes. By chang-
ing the vane angle, the system
can replicate the geometry in all
types of turbo, large or small,
and thus achieve the optimum
gas-flow characteristics. The guide
vanes are controlled by the engine
management system. The result
is a high turbine speed – and
therefore higher boost pressure –
even at low engine rpm. With
more air available, the combustion
is increased, yielding greater
power and torque.
Special features on the 911 GT2
include flow-optimised turbines
and larger compressors which
generate a higher boost pressure.
Maximum torque is
achieved at
low rpm and sustained across
much of the engine speed
range.With 680 Nm available between
2,200 and 4,500 rpm, the
resulting acceleration is nothing
less than phenomenal.
When the boost pressure reaches
its maximum value, the guide
vanes are opened further. By
varying the vane angle, it is
possible to generate the required
boost pressure at all engine
speeds. As a result, there is no
need for excess pres
sure valveson the intake side as found
on
conventional turbocharged
engines.
This delivers impressive
engine efficiency and lower
fuel consumption.

· 107 · · 106 ·
The 911 GT2 |Technical data
Technical data
Engine
Cylinders6
Displacement3,600 cm3
Max. power (DIN)390 kW (530 hp)
at rpm6,500
Max. torque680 Nm
at rpm2,200 – 4,500
Compression ratio9.0 : 1
Transmission
LayoutRear-wheel drive
Manual gearbox6-speed
Chassis
Front axleMcPherson-strut suspension
Rear axleLSA multi-link suspension
SteeringVariable steering ratio,
power-assisted (hydraulic)
Turning circle10.9 m
BrakesPorsche Ceramic Composite Brake (PCCB):
6-piston monobloc aluminium fixed calipers
at front, 4-piston monobloc aluminium fixed
calipers at rear, discs internally vented and
cross-drilled
Vehicle stability systemPSM
Anti-lock braking systemABS 8.0
WheelsFront: 8.5J x 19 ET 53
Rear: 12J x 19 ET 51
Ty r e sFront: 235/35 ZR 19 (sport tyres)
Rear: 325/30 ZR 19 (sport tyres)
Weights
Unladen weight (DIN)1,440 kg
Unladen weight (EC)*1,515 kg
Permissible gross weight1,750 kg
Performance
Top speed329 km / h (204 mph)
0 –100 km / h (0 – 62 mph)3.7 secs
0 –160 km / h (0 – 99 mph)7.4 secs
0 – 200 km / h (0 –124 mph)11.2 secs
Flexibility 80 –120 km / h (50 –75 mph) 4.1 secs
in 5th gear
Fuel consumption/emissions**
In accordance with 80 / 1268 /EC as valid at the time of going to print
Urban in l / 100 km (mpg)18.8 (15.0)
Extra urban in l / 100 km (mpg)8.9 (31.7)
Combined in l / 100 km (mpg)12.5 (22.6)
CO2emissions in g /km298
Dimensions /aerodynamics
Length4,469 mm
Width1,852 mm
Height1,285 mm
Wheelbase2,350 mm
Luggage compartment volume105 litres
Tank capacity (refill volume)90 litres
Drag coefficient0.32
** Weight is calculated in accordance with the relevant EC Directives and is valid for standard specification vehicles only.
Optional equipment means greater weight. The figure given includes 68 kg for the driver and 7 kg for luggage.
** The figures given refer to vehicles with standard specification in Germany. Data determined in the NEDC (New European Driving Cycle) in accor-
dance with the EU5 (80/1268/ EEC) measurement method in the version valid at time of going to print. The figures do not relate to an individual
vehicle, nor do they constitute part of the offer. They are intended solely as a means of comparing different types of vehicle. Further information
on the individual vehicles can be obtained from your Porsche Centre.