Self-Study Programme 377 4.2L V8 FSI engine.pdf

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Service Training
Audi 4.2-litre V8 FSI engine
Self-Study Programme 377
Special features of the current Audi vee engine family are the 90-degree included angle between the
cylinder banks and the spacing of 90 mm between the cylinders.
The first member of the family was the 3.2-litre V6 FSI engine. The 4.2-litre V8 FSI engine is also a member
of this family.
It is available in two versions - a comfort-oriented basic version (used for the first time in the Audi Q7) and
a sporty high-revving version for the new RS4. A V10 engine with 5.2 litres of displacement will also be
available.
Like the RS4 engine, the V8 in the Q7 has FSI direct injection, which – following five victories in the
Audi R8 Le Mans racing car – is now being introduced in a production eight-cylinder model.
The V8 was retuned for use in the Audi Q7. A fuller torque curve up to nominal speed and spontaneous
response – these are the characteristics of this new engine.
The engine excels not only with its dominant power output and high maximum torque. The resultant
driving performance is excellent, even in the face of tough competition.
RS4 high-revving engine
377_045
Table of contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Engine mechanicals
Cranktrain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Crankcase ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chain drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Drive, ancillary units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Cylinder head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Oil circulation system
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Oil pump and oil filter module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Oil pan Audi RS4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Oil circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Cooling system
Cooling system in Audi Q7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Cooling system in Audi RS4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Air circulation system
Air intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Intake manifold flaps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Vacuum hoses in the Audi RS4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Vacuum hoses in the Audi Q7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Fuel system
Fuel system in the Audi Q7/RS4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Exhaust system
Exhaust system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Exhaust flap control in the Audi RS4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Secondary air system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Engine management
System overview, Audi Q7 (Bosch MED 9.1.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
System overview, Audi RS4 (Bosch MED 9.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
CAN data bus interfaces (powertrain CAN data bus) in the Audi Q7. . . . . . . . . 42
CAN data bus interfaces (powertrain CAN data bus) in the Audi RS4 . . . . . . . 43
Start mode of the Audi RS4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Sport mode of the Audi RS4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
The self-study programme teaches the basics of the design and function of new models,
new automotive components or new technologies.
The self-study programme is not a Repair Manual!
All values given are intended as a guideline only and refer
to the software version valid at the time of publication of the SSP
.
For maintenance and repair work, always refer to the current technical literature.
Reference
Note

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