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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 12-15-2004, 01:49 PM   #1 (permalink)
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Have been reading about the different gear ratio's and what not and want to upgrade to a LSD. I rarely go over 80mph but would love to get there sooner. The 3.15 LSD is better for more highway driving. The 3.91 LSD isn't good for prolonged highway use but is said to have neck snapping acceleration. Too get the best of both worlds im thinking a 3.46 LSD. Would the improved acceleration be worth it opposed to keeping a stock open diff? Also assuming it comes with the cover and proper flanges how hard would it be to install?
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Old 12-15-2004, 01:57 PM   #2 (permalink)
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Quote:
Originally posted by 93 325i@Dec 15 2004, 09:49 AM
Have been reading about the different gear ratio's and what not and want to upgrade to a LSD. I rarely go over 80mph but would love to get there sooner. The 3.15 LSD is better for more highway driving. The 3.91 LSD isn't good for prolonged highway use but is said to have neck snapping acceleration. Too get the best of both worlds im thinking a 3.46 LSD. Would the improved acceleration be worth it opposed to keeping a stock open diff? Also assuming it comes with the cover and proper flanges how hard would it be to install?
[snapback]251417[/snapback]
DIY:
http://forums.bimmerforums.com/forum//show...threadid=177945

DON'T go 3.91. yes it will be very zippy, but your gearing will be very short. most threads in the m3 sections agree that 3.46 is the way to go.
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Old 12-15-2004, 02:06 PM   #3 (permalink)
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http://www.bimmerfest.com/forums/showthread.php?t=5078

Read this and perhaps contact the author.
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Old 12-15-2004, 02:54 PM   #4 (permalink)
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Old 12-15-2004, 03:01 PM   #5 (permalink)
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Thank you for the link. From what I see it isnt too difficult at all. If need be I bet I can get a shop to do it for $150.
OEM is a 3.15 open diff. A 3.46 LSD would improve acceleration vastly. The only catch is it lowers top speed..considering I do not go over 80 on the highway this is not a factor. From what I hear it's the best mod in improving acceleration-next to a supercharger
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Old 12-15-2004, 04:59 PM   #6 (permalink)
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Does anybody know what differential is on a 97' 318? is it a 3.36 or 3.46? Any clues?
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Old 12-15-2004, 07:35 PM   #7 (permalink)
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personally 3.46 or 3.23

kinda of in the middle of both ,i currently have 3.15lsd
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Old 12-15-2004, 10:57 PM   #8 (permalink)
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Or you could do it the poor man's way like me. Stock 3.15 LSD with some 215/50/15s; it's the poor man's, poor man's super charger.

Off by like 3 mph at 60. But it happens
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