BMW S58, Owner'S Handbook Manual

Page: 78 / 102

S58�Engine
8.�Intake�Air�and�Exhaust�System
72
S58�engine,�electric�exhaust�flaps
Index Explanation
1 Exhaust�pipe,�left
2 Exhaust�pipe,�right
3 Rear�silencer
4 Electrical�exhaust�flap�actuator�(EAKS),�right
5 Twin�tailpipe
6 Electrical�exhaust�flap�actuator�(EAKS),�left
8.2.8.�Electrically�controlled�exhaust�flaps
The�exhaust�flaps�are�integrated�in�the�rear�silencer�in�the�outer�exhaust�tailpipes.�The�exhaust�flaps
are�operated�by�an�axially�aligned�electric�motor�with�integrated�gears�and�electronics.�The�electric
controller�for�the�exhaust�flaps�has�the�following�connections:
• Voltage�supply�(+)
• Ground�(-)
• Actuating�wire�(signal�line)
The�exhaust�flaps�can�be�used�influence�the�acoustics�of�the�engine�at�low�engine�revs�and�low�loads
for�reasons�of�comfort.�In�addition,�the�exhaust�flap�is�intended�to�reduce�the�external�noise�levels�in
everyday�urban�use.
At�high�engine�speeds�and�high�engine�loads,�the�exhaust�gas�counterpressure�can�be�reduced�by
opening�the�exhaust�flap.