m traction control

mad4slalom said:
I always understood that the lsd stopped all the power going to the wneel that lost traction, i remember losing drive out of corners in non lsd cars because the outside wheel was spinning madly,i also remember watching stock car racers with welded up diffs wanting to power them straight on at the end of the straight unless the driver fliicked the back end out into a drift. the m i read has a 25% lock up lsd , i presume that means it just lets 25% of the power go to a spinning wheel , is that the case ? i guess theres a lot to be said for some skid pan fun day with expert tuition, will look into this locally i think. :thumbsup:
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http://www.bmw.com/com/en/insights/technology/technology_guide/articles/variable_m_different_lock.html

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Variable M differential lock.

The variable, speed-sensing M differential lock on the rear axle ensures that BMW M vehicles handle with the best possible traction even in highly demanding driving situations.

A conventional differential lock transmits the overall drive power to the wheels depending on the momentum and forces conveyed by the wheel running on the more slippery side, i.e. with a lower frictional coefficient.

Wherever this frictional coefficient is particularly low, for example on snow, gravel or ice, the lack of traction means that overall drive power is dramatically reduced.
The variable M differential lock offers a decisive advantage even if the wheels are running on totally different surfaces with a very significant difference in their frictional coefficient. If there is an increasing difference in the speed of rotation on the two drive wheels, the system responds by increasing locking action. As a result, the wheel under less load - for example the inner wheel in a bend on a fast serpentine road - can no longer cause an overall drop in drive force. Forward drive power remains fully available.

In extreme cases, up to 100% of power can be channelled to the wheel with the better grip. In winter, this results in a significant boost to traction. The variable M differential lock ensures that BMW M vehicles handle with remarkable sure-footedness and deliver excellent driving stability.
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went out today; we have had a lot of salt etc on the roads lately, with not much rain to clean them, they are now very black and greasey, the dsc i have been saying is over nannying, was today superb, you could.nt switch it off as anything other than a very light touch of the throttle and it was squirming all over the place, switched it back on, and hey car safe and sure footed again, could feel it twitch every now and again but the electronics sorted it out instantly, guess the m devision knew what they were doing after all :oops: :thumbsup:
 
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