BMW F 800 GS Rider's Manual page 91

How does ASC work?
The BMW Motorrad ASC com-
pares the wheel speeds of the
front and rear wheels. From the
speed difference the slip, and
with it the stability reserves on
the rear wheel are determined.
When a slip limit is exceeded, the
engine torque is adapted by the
engine management system.
What are the design
characteristics of the
BMW Motorrad ASC?
The BMW Motorrad ASC is an
assistance system for the rider
and is designed for driving on
public roads. Especially at the
limits of physics, the rider has
a considerable influence on the
extent of the control that ASC
can provide (shifting weight in
curves, loose loads).
The system is not optimized for
special requirements resulting
under extreme weather condi-
tions offroad or on the racetrack.
The BMW Motorrad ASC can be
deactivated for these cases.
WARNING
Risky riding style.
Accident hazard despite ASC.
The rider is always responsi-
ble for adapting his/her driving
style.
Do not reduce the system's ex-
tra safety margin with careless
riding or unnecessary risks.
Special situations
As lean angles increase, accel-
eration potential is also progres-
sively restricted by the laws of
physics. This can result in de-
layed acceleration when coming
out of very tight curves.
To detect spinning or slipping
away of the rear wheel, the
speeds of the front and
rear wheel are compared. If
implausible values are detected
over a longer period of time, the
ASC function is deactivated for
safety reasons and an ASC fault
is indicated. The condition for a
fault code is the completed self-
diagnosis.
In the following unusual driving
conditions, the BMW Motorrad
ASC can be automatically deacti-
vated.
Unusual driving conditions:
Driving on the rear wheel
(wheelie) for a longer period
with ASC deactivated
Rear wheel spinning in place
with front brake engaged (burn
out)
Heating up on the main or aux-
iliary stand at idle or with gear
engaged
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