weight AUDI S4 1998 B5 / 1.G Engine Manual

5
The technical data
•
Configuration:
V6 engine with 90° V-angle and twin
turbochargers
•
Engine code:
S4: AGB
A6: AJK
•
Output:
S4: 195 kW at 5800 rpm
A6: 169 kW at 5800 rpm
•
Torque:
S4: 400 Nm at 1850 to 3600 rpm
A6: 310 Nm at 1700 to 4600 rpm
•
Maximum speed:
6800 rpm
•
Compression ratio:
9.3 : 1
•
Displacement:
2671 cm
3

•
Bore:
81 mm
•
Stroke:
86.4 mm
•
Weight:
approx. 200 kg
•
Engine management:
Motronic ME 7.1
•
Firing order:
1-4-3-6-2-5
•
Fuel type:
S4: 98/95/91 RON
A6: 95/91 RON
•
Compliant with emission standard:
EU III-DFigures obtained using 98 RON
unleaded premium fuel to
89/491/EEC.
Figures obtained using 95 RON
unleaded premium fuel to
89/491/EEC.
500
450
400
350
300
250
200
150
100
50
0200,0
180,0
160,0
140,0
120,0
100,0
80,0
60,0
40,0
20,0
0,0
0 1000 2000 3000 4000 5000 6000 7000
SSP 198/02

Speed [rpm]
Torque [Nm]Output [kW]

S4
500
450
400
350
300
250
200
150
100
50
0180,0
160,0
140,0
120,0
100,0
80,0
60,0
40,0
20,0
0,0
0 1000 2000 3000 4000 5000 6000 7000
SSP 198/46

Speed [rpm]
Torque [Nm]Output [kW]

A6

22
SSP 198/04

Engine
Air ducting
Fresh air is induced by the combined air filter
and air mass meter and distributed to the two
exhaust gas turbochargers by the air
distributor.
The air distributor is made of plastic.
Advantage:
•
Lower weight
•
The intake air is heated to a lesser degree
by the engine
The air, which is compressed and thus heated
by the exhaust gas turbocharger, is fed to the
charge air coolers.Cooling air intakes in the bumper and air vents
in the wheel housing liners ensure that a
sufficient amount of air flows through the
charge air coolers.
Advantage of charge air cooling:
•
Cooled air has a higher density, and this
means improved volumetric efficiency.
•
The lower temperature reduces knock
tendency also.
The compressed air streams then converge
upstream of the throttle valve control part and
distributed to the individual cylinders in the
intake manifold.
Exhaust gas turbocharger
Throttle valve control part
Charge air cooler
Air distributor
Air mass meter
Air filter

24
SSP 198/33

Engine
A new generation of probes is used
in this engine.
The “planar lambda probe“ is an
improvement on the finger-type
lambda probe (refer to chapter on
“Sensors”).
Advantage:
•
Short warm-up time
•
Less heating energy demand
•
Long service life
•
More stable control
characteristic
Exhaust system
The exhaust manifolds are designed as pipe
elbows with insulated air gaps.
Advantage:
•
Less heat loss of the exhaust gas and less
heat radiation in the engine compartment
•
Weight saving
Located downstream of each exhaust gas
turbocharger is a primary catalytic converter
close to the engine (metal substrate) .
Advantage
•
The catalytic converters quickly reach a
state of readiness for operation after a cold
start
The large-surface area main catalytic
converters (ceramic substrate) are located
under the vehicle floor.
Lambda probe
Prim. catal. converterMain catalytic converter
Exhaust manifold
Wire mesh ring acting
as a spacer
Air-gap-insulated pipe elbow
Outer shell
Inner pipes

45
SSP 198/34

The accelerator pedal module combines the
accelerator pedal and the accelerator position
sender as a unit.
The mechanics of the accelerator pedal module
are located inside the module housing.
Sensors G79 and G185 are located in the
housing cover.In keeping with our policy of continuous product
improvement, the accelerator position sender
has been replaced by the
accelerator pedal
module
.
The accelerator pedal module has already been
used in other vehicle models within the Group.
Advantages of the accelerator pedal module:
• Compact, lightweight, easy to assemble
• Modular technology
• Inexpensive to manufacture
Module housing
Housing cover and
sensors
For manual gearbox:
Stop buffer
For automatic gearbox:
Pressure element for
conveying the authentic
feeling of a kickdown