Thread: X-Drive Vs RWD
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      10-07-2013, 08:02 AM   #37
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Quote:
Originally Posted by drob23 View Post
The previous gen quattro center differentials are not self locking - they are something like max 15-85/60-40. If one axle has literally zero traction than it will act like an open diff and route all torque to the freely spinning axle. The simple solution is to hit the brakes. The newest iteration of the quattro diff is self-locking (crown center differential), but currently can only be found a select few Audi cars.

Xdrive won't have this problem since the torque routing to the front axle is computer controlled, so the abs computer will detect front wheel slip and tell xdrive what to do. Of course this has negative implications in other scenarios, but for the one above, this is the best configuration other than a true 4x4 locking diff or self-locking one. The EVO and STI employ more advanced versions of active (computer controlled) center differentials.
When you have to stop the car in order to reverse the gear to rear one ( when you park the car) what the computer can do? There is nothing to predict.
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