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318IS Diff Ratio
Posted: Fri Oct 12, 2007 11:35 am
by Trento
My E30 318 IS has now developed a noisy rear diff. I would like to change it for a LSD unit. Is this worth doing and are the ratios the same? I seam to be getting different answeres from people. What ratio did the 318IS have as standard?
Any help and advise is greatly appreciated guys.
Thanks
Re: 318IS Diff Ratio
Posted: Fri Oct 12, 2007 11:41 am
by Chris-W
4.1:1, very hard to find LSD in that ratio.
Re: 318IS Diff Ratio
Posted: Fri Oct 12, 2007 11:45 am
by Jamese30
Trento,
Yours is a 3.45:1 ratio. If you were to get a 325i LSD you would be getting a 3.91:1 which would give your car better acceleartion but a lower top speed. There are other LSD ratios out there as well so make sure you know what you are buying when you get it.
Good luck,
James
(Ooops
my mistake, I stand corrected... 4.1 it is, same as standard for 320i and 318i)
Re: 318IS Diff Ratio
Posted: Fri Oct 12, 2007 9:33 pm
by kevin316i
Standard ratio for 318is is 4.10. This is a small casing diff and very difficult to find a small casing LSD in this ratio. If the 325is diff is 3.91 or 4.10 ratio then it would suit but this is a large casing diff, but can be made fit by adjusting the prop shaft length. LSDs also require special oil, Castrol SAF-XJ, available from main dealers.