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E36 M3 (1995-1999)

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  #1  
Old 07-05-2014, 08:23 PM
///Mariani ///Mariani is offline
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Mein Auto: 05 E60 545i, 84 E30 318i
Diff Ratio

Hey guys. Im not an e36 owner but I recently dropped a S52 into my E30 and wanted to ask a few Differential questions. Im still trying to get used to all of the E36 components and getting a feel for everything as I drive it. Of course the car is completely transformed now. But one thing I havnt swapped out yet is the Diff. Its stock 84 318i diff 3.64 gear ratio. And its terrible. My Tach isnt working yet but at 45 MPH listening to the motor, it sounds like its hanging around 4000 RPM in 5th gear. And at 60, it sounds like its trying way too hard just to hit that speed. The motor came out of a 98 with a ZF 310. So I tried to match the stock ratio of the 98 with a 3.25 LSD out of an old 6 (closest I could find) Havnt received it yet, but looking at those numbers, that doesnt seem like much of a difference. The DS still spins 3 times per one wheel turn. Will this drastically bring my revs down? What RPMs are you guys at when doing 45 MPH, or 60? And these questions are mainly aimed at my guys with the 3.23 gear ratio. Ill be closer to you guys. I heard earlier M3s had a higher ratio so ur experience probably wont match mine. Im just really curious since I dont really have much experience with changing gear ratios. It seems like such a small change from 3.64 to 3.25. Its not a very significant drop but i guess its one of those, "a little goes a long way" sort of things.
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  #2  
Old 07-07-2014, 07:28 AM
7pilot 7pilot is offline
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Mein Auto: 90 Ford Tempo
A 3.23 with a zf 320 is standard USA. Market 96-99 E36 M3 gearing
A 3.15 with a zf 310 or 320 is USA market 95 M3
The gearing is apprpriate.
Maybe a custom 2.93 LSD ?
m

Last edited by 7pilot; 07-07-2014 at 07:29 AM.
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  #3  
Old 07-07-2014, 08:44 AM
bmw-mania bmw-mania is offline
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+1 ^

3.23 with a Quaife Limited slip is AWESOME.

3.15 would be a good alternative if you cant find a 3.23.

Make sure you get yourself a Limited Slip Diff.. look for "S" tag, or check it by hand.

Ive been through a 4.10, 3.91, 3.64, & 3.15, I must say the 3.23 is *just* right for me.


Cheers!
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  #4  
Old 07-07-2014, 04:47 PM
///Mariani ///Mariani is offline
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Location: Georgia
 
Join Date: May 2012
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Mein Auto: 05 E60 545i, 84 E30 318i
I tried to match it close with a 3.25 LSD from an E24(still not here yet). Closest I could find to fit the E30. I cant imagine it being too different from 3.23, maybe +2 or 300 revs? Anyway ill see, It sounds like I am about to blow a head gasket just trying to stay at 65, Im not pushing it, though I dont have an exhaust set up just yet, I just wanted to get this Diff swap out of the way first.
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Last edited by ///Mariani; 07-07-2014 at 05:07 PM.
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