Best diff for b32

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e30s50b30
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Mon Oct 29, 2012 10:08 am

Hi fellas , I used a 3.64 diff in my last bodied set up I now have the car taken apart and is being done proper by a fellow zoned ( a good man ) .

My dilemma is the 3.64 diff has high revs and I was not happy with the top speed , acceleration was like a demon though ! I tried to find a 3.25 diff and am still trying . I'm looking at a 2.93 as a possibility any pointers ? I'm only going to use the car on the road no track time , which diff can give normal revs apart from the 3.25 e30 one ? What price range too ?

Thanks
jmc330i
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Mon Oct 29, 2012 12:19 pm

What gearbox you running - 3.0ltr 5spd or 3.2ltr 6spd?
James
'91 325i Sport
'93 318i touring 16v
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e30s50b30
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Mon Oct 29, 2012 2:37 pm

I'm running the 3.0l one from my old m3
jmc330i
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Mon Oct 29, 2012 3:49 pm

A 3.15 diff from a Z3M would be ideal for road use. I ran one on my 3.0ltr 5spd, still pulled quick but was more civilised on the motorway etc.

You will notice a real drop in acceleration compared to the 3.64 diff, but it will rev lower at speed.
James
'91 325i Sport
'93 318i touring 16v
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e30s50b30
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Mon Oct 29, 2012 5:55 pm

ta james , what of the top speed ? i dot want to be slain by highway combe souped up 318is lol
jmc330i
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Mon Oct 29, 2012 7:06 pm

No idea on top speed, but I had mine off the clock passing a 911 of some sort :D
James
'91 325i Sport
'93 318i touring 16v
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e30s50b30
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Mon Oct 29, 2012 8:03 pm

well that was not bad! i got beat by a t5 volvo .
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ajay
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Mon Oct 29, 2012 8:41 pm

I spun the rear wheels at 90mph, when i dropped down from 5th to 4th and floored it. (s50,5sp,3.15,with light flywheel). Won,t atempt that again! LOL
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