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Old 12-24-2008, 09:15 AM
jcl10 jcl10 is offline
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Location: BC Canada
 
Join Date: Nov 2004
Posts: 337
Mein Auto: 2003 X5 3.0
Quote:
Originally Posted by Corgidog View Post
I also have an 09 535 X drive and had similar questions when I read the owner's manual. My take is to set to DTC when your wheels are spinning in snow and to use DSC when you want to disable the system which would affect traction. If I drive normally on lightly snow covered roads my guess is not to use DTC but I could be all wrong.
That isn't what DTC is for. The confusion starts with the BMW labelling system for warning lights and the button.

In normal state, no lights, you have DSC (Dynamic Stability Control) and DTC (Dynamic Traction Control), by default. DSC helps with sliding, DTC puts a brake on to stop a wheel from spinning. There is a low system threshold for a spinning wheel, meaning the system (nanny) intervenes quite early.

Pushing the button once turns off DSC, but keeps DTC on. It allows more wheelspin than the standard setting (fewer nannies). This is designed to be used if you try to get going at slow speeds and the road is so slippery that you have no throttle response, ie the computer is limiting throttle because of wheel spin. Allowing some wheel spin can get you up a hill or get you moving sometimes when the system would otherwise stop you. Once you are moving, it is worth putting turning DTC off (back to normal state) for most drivers.

Holding the button for longer turns everything off. Good for track days, or playing around in parking lots to find out the limits of your car.
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