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like this...( I think...) (archive)
[ Follow Ups ] [ E30 M3 Message Board ] [ Msg. Board FAQ ]
Posted by michael on February 24, 2002 at 17:32:37:

In Reply to: What diff have I got if.... posted by Geoff on February 24, 2002 at 14:09:34:

First you need to know your Gear ratio in the gear you are in...
5th gear:
USA tranny = .81:1
Euro tranny = 1:1

Next you need to know the number of rotations per mile for your tires (go look at TireRack).

Now lets set some variables to use to figure with,
Engine RPM = RE
Axle RPM = RA
Tire Revolutions per mile = RT
Tranny gear ratio = GT
Diff ratio = GD
Speed = V

RA=RE/(GT*GD)
RA=V/RT

Therefore:

GD=(RE*RT/(V*GT)



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