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Hughandjen 2nd July 2020 20:15

LSD or not
 
Hi guys
I have a 1998 2.8 Z3 base on my 250swb. I have just been doing a full service on the car. I wanted to do the diff oil too but am not sure if it is an LSD or not. I know it is supposed to have a tab on the diff with an identity number but that is missing. On bmw forums it appears that some cars had LSD and some didnít. How to I check what I have
Thanks in advance

molleur 2nd July 2020 21:13

There should be a letter "S" on the diff casting, as well as on the missing tag beginning with "S". Most 1998 Z3's came with a Torsen visco differential and not an LSD. Hope this helps. There is a ton of miss-information about this. I too, have a manual 1998 2.8 as the base for my 250 SWB Coupe still in process. If you have the Z-3 handbook for that car, it may help. If not, let me know and I'll peek at mine.

Mister Towed 2nd July 2020 21:25

From memory, there's a difference between clutch type and gear type LSD's and I have no idea which type BMW fit.

Try jacking the whole back end up so both wheels are off the ground, then turn one wheel and observe the other. If it turns in the same direction you definitely have a clutch type LSD fitted, if it turns in the opposite direction you either don't have an LSD or you have a gear type one fitted.

If it's the latter, drive the car onto a verge so one rear tyre is on a loose surface and the other on tarmac, then accelerate away, if the tyre on the loose surface spins you have no LSD, if it doesn't spin then you do have an LSD of some type.

WorldClassAccident 4th July 2020 10:18

Just rag it around the nearest round about and see how well it drifts?

Mister Towed 4th July 2020 13:47

...then while you're upside down waiting for Trumpton to show up with their jaws of life, you can ask a helpful passer-by to take a closer look at your diff and see if it has LSD stamped on it anywhere.

molleur 4th July 2020 15:26

Quote:

Originally Posted by Mister Towed (Post 104716)
...then while you're upside down waiting for Trumpton to show up with their jaws of life, you can ask a helpful passer-by to take a closer look at your diff and see if it has LSD stamped on it anywhere.

funny!

Hughandjen 4th July 2020 16:58

Haha

WorldClassAccident 6th July 2020 22:51

Well it worked for me :-)


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