The 911 | Engine
Air intake system.
All models have a two-stage
resonance intake system, which
uses the vibration of the air as
it passes through the intake
manifold to increase the intake
volume. The system can adjust
to engine speed.
Benefits of this include higher
torque at low engine speeds and
a flatter torque curve.
The entire intake system is made
from lightweight plastic. The
air-filter housing of the 3.8-litre
engine has a variable geometry
that brings added character to
the engine sound which becomes
much more aggressive at higher
rpm.
Exhaust system.
The stainless steel exhaust system
comprises two independent
and separate exhaust tracts. Its
catalytic converters are highly
temperature-resistant and heat
up rapidly for effective emissions
reduction.
Thanks to advances in emissions
technology, they are able to meet
strict emission standards, such
as Euro 5 in Europe and LEV II in
the USA.
Using stereo lambda control, two
sensors continuously monitor the
exhaust gas composition for each
exhaust tract. A further sensor
monitors the efficiency of the
catalytic converters.*
In addition, a sports exhaust
system is available as an option
(p. 48, 150). This can be activated
as desired using a button on the
centre console.
911 Carrera S with sports exhaust 911 Carrera S exhaust system
* Not in markets with leaded fuel.
