Thread: What actually stops an e-diff retrofit?

Originally Posted by garrycol

Why is that strange?

I can understand why the electronics would do it, and maybe there are cases where it is justified. However, if you try and drive up a hill in a lower tech vehicle with the rear locked and the centre unlocked you will soon stop with one front wheel spinning as the CD transfers all drive to the front.

I have a video somewhere of Trav (aquarangie) doing exactly that because his RRC had a rear ARB (locked) and a worn BW t-case that had not locked up yet.

Originally Posted by garrycol

Why is that strange?

Well, I just thought that as the rear needed to lock, it would consume more torque from the transfer case thus removing torque from the front wheels slowing the vehicle if those front wheels had traction. So by the centre locking it maintains the front torque and traction.

Which did happen in one case, I have a movie of the rear locking then the centre while the rear stayed locked, then rear unlocked and centre stayed locked. But it's too big to upload now, need to trim it first...

But I don't understand it and the electronics are pretty awesome, so with all the permutations for different TR scenarios, including engine braking down hill & hill descent control, I guess it's not strange after all. Thanks for allowing me to soul search and reconsider

For sure, but in many situations have both rear wheels locked will negate the need for the center diff to lock.

Originally Posted by garrycol

For sure, but in many situations have both rear wheels locked will negate the need for the center diff to lock.

Give one example.

Originally Posted by isuzurover

Give one example.

When one rear wheel looses traction and the other rear wheel does have traction.