Quote:
Originally Posted by CSBM5
It's not electronic but totally passive. It's a GKN Visco-lok LSD unit. Requires speed differential between rear wheels to (quickly) begin locking action.
|
Quote:
Originally Posted by dogbone
I did a long three part write-up about the differentials and compared the OEM unit's performance to an OS Giken Superlock. It has tons of AIM Solo DL charts showing how the rear wheels spin in relation to each other at Buttonwillow Raceway. Start at post #173.
https://www.m3post.com/forums/showth...1158445&page=8
It's really really long, but I think it might have something in there for you.
But a couple quick answers to your questions:
-the E9x M3 diff is not electronically controlled. It's a speed sensing unit and requires one wheel to spin up for it to lock.
-traction control does not prevent the rear wheels from spinning at different speed. It still allows that to happen. Otherwise, there's no way for the unit to lock. Most of traction control is done by cutting engine power, and individually engaging the front brakes as needed.
I also did a write-up showing traction control behavior. Many people think traction control uses the rear brakes mostly. This is incorrect. The AIM Solo DL can show how all four calipers activate individually. I posted some fairly quick laps from several tracks showing traction control engaging the front brakes almost 100% of the time. You can check that out here:
https://www.m3post.com/forums/showpo...&postcount=747 |
thanks for the quick and dirty's. when you say requires one wheel to spin to lock, is it by a percentage of speed differential, or literally as soon as the speed is different? the speeds between the two wheels would be different almost all the time, except in a perfectly flat straight line?