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      10-24-2010, 02:30 PM   #31
madfast
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Drives: 2010 PB Evo X MR-T
Join Date: Jan 2010
Location: NY

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Quote:
Originally Posted by bmwnorge View Post
so the xdrive works in zero resistance?... why did bmw decide to do it this way?
yes. if both rears are off the ground, x-drive can transfer all the tq to the fronts. quattro uses a torsen center diff and as such if one side is off the ground (or on rollers like this "test") then the diff acts like an open diff and sends more tq to the slipping wheel.

anybody whose ever had a quaife LSD knows this, but how often do we have wheels completely lifted off the ground?

from an objective point of view x-drive IS better than quattro in that you can transfer tq however you like. its all on the software. quattro being 100% mechanical acts only in the way that which it was designed.
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