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      09-17-2017, 03:38 PM   #59
kapetajr
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Drives: 2015 E84 X128I
Join Date: Sep 2015
Location: Cookstown, ON. Canada

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Quote:
Originally Posted by Dalco450 View Post
Any links to the theory ? I'm interested because they just changed my transfer case last week under warranty. I don't want to pay the bill if it arrives again because of wrong size of tires. My warranty expires next week.
Dunno if this helps but here is what the manual says

"The tire circumference can fluctuate up to 1% or more as a result of mixed tires or wear. The tire tolerance logic decides depending on the driver's command and driving situation whether the slip is to occur in the transfer case clutch or at the contact area between tire and road.

If the slip is permitted in the transfer case clutch, the locking pressure set by the pre-con- trol is reduced in order to keep the work loss low. In the driving dynamic control situation, the clutch is locked slightly more than normal, the four wheel drive is always guaranteed when required.

For maximum xDrive performance, tires (and wheels) of the same diameter should be installed on the vehicle."
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