Fuel, Exhaust & Engine Electrics
Page 2.31
Exhaust System, Emission Control
General
The exhaust systems in all new Cayenne models have been redesigned
for direct fuel injection (DFI) in order to achieve maximum performance
with minimum emissions.
All exhaust systems include the following:
• Two pre-catalytic converters.
• Two main catalytic converters.
• Two oxygen sensors (LSU) in front of the catalytic converters.
• Two oxygen sensors (LSF) behind the catalytic converters.
• Exhaust standard EU4 and LEV2 (USA emission standards).
Cayenne V6 Exhaust System
The exhaust system has two pre-catalytic converters and new in the V6
engine, two main catalytic converters as well as a crossover pipe
between the two exhaust tracts. The pre-catalytic converters installed in
USA vehicles are different to those used in RoW vehicles.
The exhaust quality is monitored by two oxygen sensors (LSU) in front of
the pre-catalytic converters and two oxygen sensors (LSF) behind the
pre-catalytic converters. In addition, the V6 exhaust system as far as the
rear muffler has been designed as a dual flow system. This improves
the gas cycle by reducing the exhaust back pressure and ensuring
better matching of the gas oscillations in the exhaust system. Behind
the two main catalytic converters, there is a crossover pipe in the front
muffler that connects the exhaust tracts. As a result, the torque curve is
positively influenced at the lower end of the rpm range by an improved
gas cycle.
1 - Pre-catalytic converters (metal substrate)
2 - Decoupling elements
3 - Main catalytic converters (ceramic substrate)
4 - Front muffler with crossover pipe
5 - Main exhaust muffler
6 - Exhaust tailpipes with trim
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