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      04-03-2024, 08:38 AM   #2950
grannyknot
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Drives: 2008 Z4M coupe
Join Date: Oct 2021
Location: toronto

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Quote:
Originally Posted by maupineda View Post
You know, I thought this a lot when choosing the ratio, and settle on 4.1. Now I think 3.91 might be a better compromise… and, you can still go to a 12% increase by changing tire size down to 40/35 from 45/40.

A 3.91 is 8% increase, tire size is 4%, and 4.1 is 13%.
I rebuilt my diff a couple of yrs ago and swapped out the stock gearing for 3:91 gears, I do like the quicker take offs but I'm wishing now that I had gone with the 4:10 instead.
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