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Ocallen

E39 diffs, any upgrades ?

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I live in Dorset and do not have any unlimited speed autobahns unfortunately. I have very few dual carriageways and the few I have of those are normally choked with holiday traffic. I do have some good country roads where I often have 400/500m of clear road before the next bend. 

Is there a diff that will give me a bit more acceleration for my old 523i ? I don't mind sacrificing top speed because I'm never going to use that.

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I imagine the 520i might be shorter but as you have a smaller engine most other diffs will be even longer legged i think.

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Jap import E39 diffs are designed for acceleration at a cost of top end speed...

 

Finding one could be hard though

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From RealOEM, looks like yours diff is 3.07:1.  A 525i manual will give you 3.23:1 (auto is 3.38:1). There should be a few of them about. 

 

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