BMW HP4 Rider's Manual page 115

DTC adjustment
The DTC response character-
istics can be adjusted in SLICK
mode. As a result, DTC inter-
ventions on the race track can
be adjusted to the physical limits
of worn tires respectively of tires
not tested by BMW Motorrad.
Based on the standard setting,
the point in time of DTC inter-
vention can be moved in seven
steps each to an earlier or later
time. The earlier the intervention
occurs, the better is the lateral
stability. If intervention occurs
later, traction is improved at the
expense of lateral stability until
tire grip is exceeded.
Special situations
As lean angles increase, accel-
eration potential is also progres-
sively restricted by the laws of
physics. This can result in re-
duced 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 and the
angle is considered, for example.
If these values are detected to
be implausible for a long period,
a replacement value is used for
the angle and the DTC function
is deactivated. In these cases,
a DTC error is displayed. The
condition for a fault code is the
completed self-diagnosis.
In the following unusual driving
states, the BMW Motorrad DTC
can be automatically deactivated.
Unusual driving conditions:
Driving on the rear wheel
(wheelie) for a longer period
with DTC deactivated.
Rear wheel spinning in place
with front brake engaged (burn
out).
Heating up on an auxiliary
stand at idle speed or with gear
engaged.
Provided that the coding plug for
the SLICK mode is not installed,
the DTC will be reactivated by
switching the ignition off and on
again and then accelerating the
vehicle to a speed of more than
3 mph (5 km/h).
If the front wheel loses contact to
the ground during extreme accel-
eration, the DTC reduces the en-
gine torque until the front wheel
touches the ground again. In
RACE and SLICK mode wheelies
are possible at small angles.
In this case, BMW Motorrad rec-
ommends turning back the throt-
tle grip somewhat to achieve
a stable driving state again as
quickly as possible.
On a slippery surface, the throt-
tle grip should never be suddenly
turned back completely without
pulling the clutch at the same
time. The engine braking torque
can cause the rear wheel to slip,
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