oil type PORSCHE 911 GT2 2008 5.G Information Manual

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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.

· 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.