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Rear end ratios

 
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Bud Fong



Joined: 31 May 2005
Posts: 78
Location: SF Bay Area, Ca.

PostPosted: Thu Oct 27, 2005 4:56 pm    Post subject: Rear end ratios Reply with quote

What is a general good ratio for a 325I chipped for track events...3.25, 3.73???? checking out Ebay for a limited slip one since mine is not. I know it varies w/ track to track.
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Tom Olsson
Site Admin


Joined: 03 Nov 2004
Posts: 242
Location: Seattle, WA, US

PostPosted: Fri Oct 28, 2005 6:33 am    Post subject: Rear end ratios Reply with quote

We up here in the NW are pretty partial to the 4.10 LSD out of an M3 in our E30's. Very nice launch out of the corners, and the car doesn't run out of gear because it's such a brick. If you're running an E36, then it's going to be different.

[ 10-28-2005: Message edited by: Tom Olsson ]
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panzerkeil302



Joined: 10 Mar 2004
Posts: 2182

PostPosted: Fri Oct 28, 2005 2:53 pm    Post subject: Rear end ratios Reply with quote

where else could I find (what other cars) the 4:10:1 aside from the m3?

thanks!
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dale



Joined: 22 Aug 1999
Posts: 3085
Location: Seattle, WA USA

PostPosted: Fri Oct 28, 2005 10:34 pm    Post subject: Rear end ratios Reply with quote

Hey Panzer,
Some of the 325i cars with automatics came with one, but you might want to avoid those as they are almost all open(ie not LSD).
Be sure to check the fitment of the differential before purchase, some E30s have a smaller housing size.

9/1988 and newer in the 325ic have the 4.10, older have the 3.73, according to realoem.com
http://www.realoem.com/bmw/showparts.do?model=BB23&mospid=47326&btnr=33_0014&hg=33&fg= 05

Best place I've found to look for a 4.10LSD is either ebay, or your local euro salvage yard.

Just checked realoem.com for part numbers and they match:

part number for a 4.10LSD for a 1990 325ic is
33101212731

part number for a 4.10LSD for a 1990 E30 M3 is:
33101212731 http://www.realoem.com/bmw/showparts.do?model=1003&mospid=47312&btnr=33_0014&hg=33&fg= 05

interesting, according to realoem.com, the 1989 325i coupe with automatic, had the same 4.10LSD (LSD was always extra cost option, except perhaps 325is)

up to 9/88 3.73
9/88 - 9/89 4.10
9/89 and up 3.73

33101212731
http://www.realoem.com/bmw/showparts.do?model=1123&mospid=47309&btnr=33_0014&hg=33&fg= 05

Dale

[ 10-28-2005: Message edited by: dale ]
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