Mate at work is putting a ZX12 into an imp useing a sierra diff, ideal ratio to find ?

Cheers in advance.

I have a 3.62 LSD in my Indy with a ZX12. I believe the Hellfire guys use the same.

It's a good all rounder but I guess to an extent it depends on what the usage is going to be?

[Edited on 10/11/08 by eznfrank]