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Differential Stuff

Posted by Milo 
March 08, 2012 07:38PM
My Diff tab says S2.93, which means bog-standard '87 325 spec right? How do I tell if it's LSD or Open?

Matt

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Matt in Everett, WA

BMW n00b with a 1987 325e
rkj
March 08, 2012 08:00PM
Quote
Milo
My Diff tab says S2.93, which means bog-standard '87 325 spec right? How do I tell if it's LSD or Open?

Matt

That's easy Matt, lift both rear wheels off the ground. Spin one side, if the other goes the same way you have an lsd, if it goes the other way or stands still it's open. Good luck
March 08, 2012 08:04PM
Thanks RJK! IIRC it spins reverse.

My car motors through the snow nicely, the rear wheels seem to keep churning not favoring one wheel over the other so I thought I had LSD. Are Open Diffs "smart" as well?

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Matt in Everett, WA

BMW n00b with a 1987 325e
March 08, 2012 08:30PM
Quote
Milo
My Diff tab says S2.93, which means bog-standard '87 325 spec right? How do I tell if it's LSD or Open?

Matt

Milo,
The 'S' indicates you have an LSD smileys with beer
rkj
March 09, 2012 11:32PM
Quote
Milo
Thanks RJK! IIRC it spins reverse.

My car motors through the snow nicely, the rear wheels seem to keep churning not favoring one wheel over the other so I thought I had LSD. Are Open Diffs "smart" as well?

Are lsd's smart? no, but when the clutches are toast it does revert back to an open rear, and they make more noise than usual. One give away you have the wrong oil is when you're going around a corner, the rear will make all kinds of clunking (the clutches are chattering). I use GM posi additive along with lsd oil. Unfortunately, the gm additive is synthetic these days not the real stuff (whale oil stuff?) that comes from some sea creature...

Cheers, Rick
March 20, 2012 08:23AM
Sorry for being AWOL, had to fly to Texas for a few days to be with my mom (health issues)

Thanks for the information guys, an LSD is cool. If I had enough power to drift on anything but snow it would be even better.

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Matt in Everett, WA

BMW n00b with a 1987 325e
March 22, 2012 12:20PM
There are two ways to get drift, more power or less friction (snow, dirt, etc).
The later is cheaper, same fun, and safer.
:boohoo:
March 23, 2012 09:16PM
I got a lesson in the low power drifting this week at a go-cart track that had a slick track and carts with hard tires just for that purpose. The low powered carts would spin and slide easily and were a lot of fun to drive.

Bob in Everett
March 24, 2012 06:48AM
There's no differential, that makes them easier to slide. Last year I took part in a cart race on slicks, in the rain. Very hard to keep the cart on the track but oh so much fun, even though the setting sun was obstructing sight.
March 25, 2012 12:47AM
Some of the carts would turn really well but one would not turn at all. Had to stomp the brake to get it to slide. It must have had sticky tires on the rear of that one. The lack of differential would sure make them slide. Had not thought of that.

Bob in Everett
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