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      Yesterday, 01:02 PM   #1
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Going from 2.81 to 3.23 LSD Differential

Hi Guys, I noticed BMW offers the M Performance LSD differential with either FD of 2.81 (same as stock) or 3.23 for the 3 and 4 series.

Has anybody tried the 3.23 ? This should make the 340i gearing almost like the Toyota Supra and should make the car a lot quicker.
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      Yesterday, 05:32 PM   #2
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I'm curious about this. Following.
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      Yesterday, 09:10 PM   #3
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You'll need to do some coding, otherwise you'll get all sorts of drive train malfunctions.
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      Yesterday, 10:29 PM   #4
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Quote:
Originally Posted by B58togo View Post
You'll need to do some coding, otherwise you'll get all sorts of drive train malfunctions.
To my knowledge the m performance lsd is fully mechanical and requires no coding. Changing the gear ratio in the diff has nothing to do with the computer, it's physically the gear set within the diff that determines the rotation of the axles.
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      Yesterday, 10:37 PM   #5
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I always thought with boosted cars you wanted a longer final gear? These cars, especially with new turbos, etc. top out so quickly, I'd want something with a longer final beat, not shorter. No?
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      Yesterday, 11:04 PM   #6
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I always thought with boosted cars you wanted a longer final gear? These cars, especially with new turbos, etc. top out so quickly, I'd want something with a longer final beat, not shorter. No?
Depends on the end goal, acceleration off the line or top speed
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      Today, 02:18 AM   #7
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The manual could do with shorter gearing.
3rd goes to nearly 170kmh and 4th 230kmh.
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      Today, 05:17 AM   #8
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Coding is the easiest part since it's an OEM product the dealer should do it in little time with the installation.

Problem is it's very expensive where I live, anybody know where I can find a good deal on this one ?

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You'll need to do some coding, otherwise you'll get all sorts of drive train malfunctions.
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