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Old 07-31-2008, 09:24 PM   #1
e30Touring
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Looking for advise on LSD diff and to buy one

I am rattling my brains out after my M52/M50 and M3 tranny swap. I need an LSD that will give me a longer 1st gear and lower rpms at highway speeds. I am at 4K at 110kms. Help!

If you have one in the Ontario area I will buy it. The car is a 320i Touring so I want a good balance of longer gears and speed but with liveable RPM.

Cheers,

Shawn
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Old 07-31-2008, 09:40 PM   #2
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Shawn you will need something like a 2.93 LSD. I9 am pulling apart a running 88 325es which has one. Let me know if you are interested. You can email me from Max, I will receive the email on my Black Berry.
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Old 07-31-2008, 11:12 PM   #3
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get a 2.93 from a 328. make sure its manual/standard transmission
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Old 08-01-2008, 01:53 AM   #4
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Get a e28 LSD. IIRC its 3.25. Swap the back cover and output flanges, and it will still have a decent amount of acceleration.
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Old 08-01-2008, 06:21 AM   #5
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ill vote for 325LSD or 3:46.
2.93 will be a great diff if u end up going Force Induction later. But for N/A it will suck for city driving.
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Old 08-01-2008, 09:17 AM   #6
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Guys look at the engine tranny combo he has, the gearing is quite a bit lower than that compared to an m20 with Getrag 260. The 2.93 in the 325 es is not rocket fast but with the added torque out of the 2.7 super eta it's not bad.
If he is getting 110k @ 4K RPM and he wants lower RPM on the highway, the 3.25 will not do too much better than the 3.73 he has now IMO.

I was giving him advice based on the m52/m3 tranny and his need for lower RPM on the highway. With that much torque out of the m52 and gearing from the m3 tranny the 2.93 might be a good combo, however thats my opinion
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Old 08-01-2008, 12:11 PM   #7
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hey striker, but also know that E36 m3's comes stock with either 3.15/323 - 95 m3's and 97's m3s are 323 and 3,38. Based on that its the best combo....just my advice.
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Old 08-01-2008, 01:57 PM   #8
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Keep in mind too (no one thinks about this) that E30's have smaller rolling diameters. A 3.15 in an E36 M3 on 245/40/17 rears is like a 3.02 in an E30 on stock tires. A 2.93 in an E36 is like a 3.05 in an E30.

I'd probably run a 2.93 with an M52. That thing doesn't really do much more when you rev it, might as well get better mileage.
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Old 08-22-2008, 09:14 AM   #9
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Instead of guessing, use a hypothetical rpm indicator. Plug in the tire height, your gearing, and the cruising speed..... it spits out your rpm.
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Old 08-22-2008, 09:20 AM   #10
alpine323
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Here is some good info for you:

http://www.diffsonline.com/techinfo/index.shtml
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