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Re: What is advantage of limited slip over ASC? (archive)

[ Follow Ups ] [ 3-series (E46) Message Board ] [ Msg. Board FAQ ]

Posted by alex on April 16, 1999 at 20:19:37:

In Reply to: What is advantage of limited slip over ASC? posted by Mofongo on April 16, 1999 at 15:07:26:

i don't think it's the same thing. l/s actively works with distribution of power to regain traction where asc slows wheels in hopes of regaining traction. sure, asc applies the breaks to the spinning wheel, but it doesn't actively send that power to the other one like a l/s would. it's only software, it can't. asc also cuts engine power to _both_ wheels, which a l/s doesn't do. i know you can shut off asc, but then both wheels just spin. i'm pretty sure that the 2.8 z3's had (or still have) l/s. i know my '92 318i had it (i realize it's a different set up and weight, but same issue) but they later quit putting the l/s on the lower 3's for cost reasons--software is cheaper than hardware. that 318i (except for its lack of weight) drove quite well in ohio's ice and snow, and i (perhaps incorrectly, i will admit) accredit that to the l/s. if l/s wasn't useful w/asc, why did they continue to put it on the higher end 3's and z3's after they came out with asc?

: : i hope this isn't a stupid one...

: : does anyone know about the e46's (all versions, but looking more for the coupes) having a limited slip? i know they've got the traction control, but those of you who've have the privilege of drivin' a z3 in the winter know that asc doesn't quite cut it.

still, do they put it on the new e46's? does anyone know?

: : thanks
: : alex

: What would be the advantage of a limited slip? The ASC already functions as one. The viscous coupling in the limited slip differential just prevents there from being too much of a difference in the rotation speeds of the wheels. ASC would detect this same difference and brake the faster wheel, thereby directing power to the other wheel. Same end result. The one disadvantage of traction control would be that the rear brake pads get worn out faster.

: Mofongo

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