Quote:
Originally Posted by Priority 1
Thanks for taking the time to share your experiences and thoughts. This is the kind of technical discussion i'm looking for since I've exhausted my abilities. I did want to question a portion of your theory. You mentioned that the front axle can never be driven faster than the rear, but my understanding of xdrive is that it can transfer 100% of the torque to the front. This is needed when a car has the rear wheels on ice and the front wheels have grip. http://en.wikipedia.org/wiki/BMW_xDrive The description section on that link also says that, but to give you a better source i think i can find one of the e9x technical documents ( http://www.bmw.com/com/en/insights/t...mm_xdrive.html) that goes into more detail. Also the difference that you calculated for my setup is within a few 32nds of uneven treadwear so I still can't understand why it didn't work fine. |
This is marketing speak getting the best of us. 100% of the torque transferred to the front wheels does not mean that 100% of the power is transfered to the front wheels. Basically they are saying that if the rear wheels are spinning with 0 traction the front wheels can pull the car on their own as long as there is traction for the fronts. This does not mean that the system can stop the rear wheels and only power the fronts. The rear driveline cannot be disengaged or clutched in any way. Only the front driveline is clutched.