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Old 30th May 2017, 12:09
Mike Mike is offline
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Originally Posted by mcramsay View Post
Apologies for the late reply, I have to admit after your recent post I've been doing some research / testing. I can confirm my diff ratio is 2.91, it seems I was misinformed by the owner I bought the rear axle from.

Also I can confirm my rev limit is standard on my car despite having the error code up. I know the ecu was previously chipped so I think that it may have been played with in the past.

Current figures are I can pull from 30-80 in 4.5 seconds in second gear, shifting at 7400 into 3rd.
You'll still not get out of third!

Have you considered 3.46, or 3.73, or even 3.91 diffs?

I am assembling an E30 with an S54 M3 swapped engine and gear box for a track car/fast road, and deliberating what will be the best diff ratio, so am interested to hear how your Sportster performs. The S54 certainly performs at its best when it is revved hard, despite Dual Vanos .
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