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      01-11-2010, 02:04 AM   #3
NFS
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Drives: M340i
Join Date: Jul 2006
Location: UK

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1. Default position when you start the car:

The DSC+ system is active. The car has full stability and traction control. This means that the engine power will be cut if the driving wheels start to spin.

2. DTC on - Short press of the DTC button:

When you engage DTC, the DSC system remains active, but the limits at which it will intervene are increased. So the car will wheelspin a bit before engine power is reduced.

3. DSC+ off - Hold DTC button for more than 5 secs

This turns the traction and stability control systems off. The driver has full control and the engine power will not be reduced, no matter how much wheelspin you get or how far the car gets out of shape in a bend.

Officially, BMW state that DTC is for low traction situations, e.g. mud, gravel or ice. However, it's pretty clear that it's also designed to allow for a more sporting drive. Motoring journalists often describe it as emulating an electronic limited slip diff.
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