Quote:
Originally Posted by spacedogg
Yeah...from what I understand...BMW X-drive must first detect wheel slippage before it transfers power...a "superior" AWD system (like Quattro) detects torque and then transfers power. Because these systems rely on torque rather than slippage, they react faster than a BMW X-drive.
BMW X-drive is great for what it does...but I suspect as a track day car...better to take the slightly lighter 335i and get a LSD made for it...
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Incorrect.. Only the middle diff of the quattro is torsen.. The front and rear are open diffs and require audi's "EDL" to lock up the wheel that is slipping. Very much like the X-Drive.
An ideal system would use Haldex in all 3 locations and computer control it. You would have 100% control of where the power goes. The computer could send all of the power to a single wheel if the programming so needed to. If I recall Volvo planned on doing something like this with the s60r PCC concept.
There are limits of LSD, which I think Haldex is on the way to solving.