Porsche 911 GT2 Brochure page 16

tailpipes are fully integrated within
Exhaust system.
the rear apron moulding. Large-
The rear silencer and tailpipes diameter tubes reduce back-
of the 911 GT2 are made from pressure on the engine, thereby
ultra-lightweight titanium to re- increasing performance. The
duce the weight on the rear axle, catalytic converters are close
and improve driving dynamics. to the engine, enabling faster
The exhaust leaves the engine warm-up and therefore improving
through high-performance efficiency. When starting from
manifolds into separate tracts cold, the process is assisted by a
for each of the two banks of secondary air injection system.
cylinders. Twin three-way catalytic
converters clean the two streams A system of 'Lambda' or oxygen
before they converge in the main sensors in each of the exhausts
silencer unit. The twin titanium provides continuous monitoring
Exhaust system
of engine efficiency. Data supplied
by one pair of sensors enables
the engine management system
to perform separate adjustment
of the air/fuel mix for each bank
of cylinders. A further pair of sen-
sors*, one on each tract, is used
to monitor the efficiency of the
respective catalytic converter. This
facility enables much more accu-
rate control of potentially harmful
emissions.
* Not in markets with leaded fuel.
· 34 ·
The exhaust system on the are based on a range of variables,
911 GT2 produces a warm, including throttle position, engine
deep and bass-rich sound – speed, boost pressure, coolant
even when the engine is idling. temperature and exhaust gas com-
position. The results are optimised
combustion and fuel consumption.
Fuel system.
A hot-film air mass sensor moni-
Fuel is supplied to each of the six tors the volume and density of the
cylinders using a sequential fuel incoming air to ensure the best
injection system. The timing of possible air/fuel mix, regardless
each injection and the volume of weather and altitude.
supplied to each bank of cylinders
are controlled by the engine
management system. Adjustments
The 911 GT2 |
Ignition system.
The 911 GT2 features static
high-voltage ignition technology.
Separate coils on each of the
plugs with platinum electrodes
ensure perfect ignition every
time. The role of distributor is
performed by the engine manage-
ment system, which controls the
individual spark plugs directly,
for optimum performance and
minimum fuel consumption.
· 35 ·
Drive