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      07-07-2013, 09:41 PM   #14
hetzle
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Drives: E90 335i
Join Date: Dec 2011
Location: San Francisco, California

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Quote:
Originally Posted by CWysong View Post
The XI should make zero difference in speed.
This idea is entirely wrong, as are all the naysayers in this thread spreading misinformation. The XI's are significantly slower than the RWD versions. AWD saps a good amount more power due to additional parasitic loss, the figures are 10-18% drivetrain loss for RWD cars and 17-28% for AWD. FWD cars have much shorter drivetrains and lose 10-15%.
Additionally, auto cars lose 2-5% more than manual cars. You'll never see an X-drive car put down as much power mod for mod as a RWD model, and they're also a bit heavier.

On the bright side you can launch the hell out of them and they do extremely well in adverse road conditions.
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