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Old 03-27-2002, 07:28 PM   #1
M54TU Schnitzer
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328 owner, differentials question, Help!

Hi,

Can anybody tell me the final gear ratio of a E46 328 ( 5-speed ) final gear ratio?
I found a E46 328 differential (5-speed) at a shop, so I want to know the final gear ratio of it before i buy it.

thanx...
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Old 03-27-2002, 07:58 PM   #2
330DTM
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What's ur final ratio right now on ur 330?
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Old 03-27-2002, 07:58 PM   #3
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From the BMW parts CD, E46 328 5 speed comes with 2.93 and Auto is 3.46 I believe they are both open diff. Not LSD.
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Old 03-28-2002, 01:23 AM   #4
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the 328 5 speed is a 2.93 open diff.
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Old 03-28-2002, 03:14 AM   #5
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oh man... mine is 2.93, too
I am looking for a 3.15, 3.23 or 3.38
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Old 03-28-2002, 08:48 AM   #6
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hmm

What's the difference b/w open diff and closed diff?
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Old 03-28-2002, 10:21 AM   #7
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Open diff is one which doesn't have a clutch pack to *lock* both axles together.

I'm not sure if the E36 diff's will fit the E46 or not, but this *may* be a possible route to go.

The 3.38 was from the M3 automatics (rare), the 3.15 was from pre-1996 M3s and 325i/iS and the 3.23 was from 1996-on M3s.

What you can look for is an E46/E36 diff from a car which doesn't have traction control. Any post 1993 BMW 3 series without traction control has a limited slip differential. For 5 and 7 series, traction control was available slightly earlier...

For performance upgrades, you generally need at least a 10% improvement in gear ratio to be noticeable. Going from 3.15 to 3.23 will yield negligible gains.


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Old 03-28-2002, 10:36 AM   #8
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I wouldn't say any post 1993. I have seen a number of bimmers 93+ without either. One of the examples is mine.

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Old 03-29-2002, 08:36 AM   #9
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Well, I haven't. In the original factory order for 1993+ 3-series cars, adding in the traction control (except for the M3), automatically deleted the limited slip diff.

Otherwise, without T/C, they all came with LSD.

The Ti could be another story, as that car isn't entirely an E36 (simply because a large portion of it isn't plug and play with other E36 vehicles, including the diff).

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Old 03-29-2002, 12:38 PM   #10
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Unfotunately the E36 M3 diffs don't fit an E46. If you want a limited slip diff for the E46, you have to go and find a E46 M3 diff, which is ALOT of $$ or get one off of BMPD.
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Old 03-29-2002, 12:50 PM   #11
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yeah... A E46 M3 diff will be alot of money.. even more expensive then a Dinan 3.15 diff.. right?
actually.. I don't really need a LSD... I just want a 3.15 diff or 3.23 diff. to have better acceleration....
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Old 03-29-2002, 01:10 PM   #12
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Yeah, the E46 M3 diff is more because of special cooling lines and what not. However, most aftermarket diffs you buy already have limited slip.
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Old 03-31-2002, 03:42 PM   #13
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I went to a 3.38 diff in my 328 and I can report some very nice gains..
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