Rear end build advice

JayBar · #1 (**permalink**) 01-25-2007, 07:58 PM

Also check out http://www.5speedtransmissions.com/gear_calculator.html
already has the gear ratio's for various transmission.

Cobra75 · #2 (**permalink**) 02-21-2007, 07:25 AM

Can anyone explain the % lock on the BMW differentials?

Does it mean the diff locks up when the % difference between the two rear wheels rotation is met? i.e. at 40%, the diff locks when one wheel is spinning 40% more than the other.

Or does it mean the % torque applied to the spinning wheel?

jeffko · #3 (**permalink**) 02-22-2007, 08:31 PM

It is the percentage of slip (as torque is applied) that the diff will allow slip. The greater the percentage the quicker the lockup reacts.

Cobra75 · #4 (**permalink**) 02-22-2007, 09:17 PM

Quote:

Originally Posted by jeffko

It is the percentage of slip (as torque is applied) that the diff will allow slip. The greater the percentage the quicker the lockup reacts.

???????????????

I apologize, for being confused here. I read your response over and over, but it appears to me that your two statments contradict each other.

1. "It is the % of slip the diff. allows." Therefore, the higher the %, the greater amount of slip allowed. Or a 40% diff allows more slip than a 10%.

2. "The greater the % the quicker the lockup" Therefore, if it locks up quicker then it follows that less slip is allowed. Or a 40% diff locks up quicker (less slip) than a 10% diff.

Which is it?