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      10-09-2008, 11:41 PM   #31
Lassaxi
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Drives: April ED - E90 328xi
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Quote:
Originally Posted by Nikolas View Post
I don't know of any AWD car that doesn't do this. Which one's are you referring to? Porsche as an example matches rotating diameter - at least mine does.
Which Porsche do you have? Porsche has a couple of different AWD systems. I can tell you that, unless you have a 997 Turbo (2006 or later), or a 2009 Carrera 4, you likely have a viscous center coupling, which is quite sensitive to small differences in circumfrence. xDrive does not use a viscous center coupling.

The Cayenne doesn't have a viscous coupling, but it does have low-range gearing, which presents its own set of problems for mismatched tires.
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