20
E82 Complete Vehicle
New DSC Function
At present only the BMW M models are equipped with a mechanical locking differential
lock for obtaining optimum traction in extreme driving conditions.
Some experienced drivers occasionally switch the DSC or DTC off, to obtain maximum
power and maintain vehicle speed while maneuvering through tight corners. They can
complain that without a differential lock too much power is lost through the inner driving
wheel which is carrying the smallest part of the load. If it loses grip, the DSC reacts by
applying the brakes to regain traction and/or limiting engine torque by shutting off injec-
tors. This results in a loss of power in mid-corner.
In order to satisfy that demand from performance-oriented drivers, as of March 2008
vehicle production the 135i will be fitted with the new DSC function program that simu-
lates the action of a mechanical limited slip differential. The system uses the typical
BMW open type differential, but uses of an electronic intervention program inside the
DSC module.
When the vehicle is in tight bend, DSC applies the brakes on the spinning (inside) driving
wheel. The
torque is then transmitted to the outside wheel which is carrying most of the
load, optimizing power and maintaining vehicle speed through the corner. The new func-
tion implemented in the DSC control module “simulates” DTC without modulation of
engine output. The DSC and D
T
C functions are unaffected by it.
DSC applies brake to the
wheel that loses traction
Power is sent to the
wheel that grips
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