Data and graphs on 4.10 gears

[Shipkiller]

I was searching M3 forum on data on Nitto NT-05 tires and came across this old post on the difference on stock gears and 4.10 gears.

http://www.m3forum.net/m3forum/showthread.php?t=119367

[ZStig]

good stuff, I was wondering if in a long run, a stock car would catch up to one with a diff, which is something I read here

[crfine88]

That was a good read, thanks

[inTgr8r]

nice find!!!

From a quick look, tires might have been the biggest deterrent to a better showing at the bottom end for the 4.10
You should definitely have the most advantage down low.
It looks to me that the 4.10 was exceeding the capabilities of the tires more so than the OE diff.

[Z4Murder]

do the m3 guys have the same diff and stock gears as us z4m guys?

[mfanatic325]

Originally Posted by Z4Murder

do the m3 guys have the same diff and stock gears as us z4m guys?

AFAIK, the diff case is slightly different, but the gears and everything inside are the same. We're talking E46 M3, not E9X M3 obviously

[pokeybritches]

IIRC 1st gear is a little shorter in the Z4M, and either 2nd or 3rd is a bit taller.

[mfanatic325]

Oh interesting. If the individual gears are different, then I never knew :P
But for sure the final drive ratio is the same yeah?

[BookerM3]

Originally Posted by mfanatic325

AFAIK, the diff case is slightly different, but the gears and everything inside are the same. We're talking E46 M3, not E9X M3 obviously

Recently picked up a diff, everything is identical exscept the cover.
Actually the cover is the very similar to the E46 M3 except it has some
of the the fins machined off to clearance the Z4m braces that run diagonally under the diff.

[ZStig]

I was told by someone that you can take the gears out of an old 7 series, but I don't know which one had the appropriate gearing