Diff

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bm1956
E30 Zone Newbie
E30 Zone Newbie
Posts: 28
Joined: Sat Jan 06, 2007 11:00 pm

Wed Jan 28, 2015 7:37 pm

How do you work out what diff to fit ie. E30 s54 6speed box on 17 rims
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motormanmick
E30 Zone Regular
E30 Zone Regular
Posts: 259
Joined: Sun Nov 02, 2014 11:00 pm
Location: Coffs Hbr, Aust

Fri Jan 30, 2015 2:47 am

Hello bm1956,
I found this useful when working out mine, feed in the gearbox ratios, tire size and diff ratio and it will give you road speed verses rpm, I think every 250 rpm, so just feed in regular bmw diff ratios and check what the outcome is, then whether you want all out acceleration or economy or somewhere in the middle, hope this is helps, cheers

http://diffsonline.com/bmw-differential ... ation.html
HairyScreech
Engaged to the E30 Zone
Engaged to the E30 Zone
Posts: 6265
Joined: Sun Jan 21, 2007 11:00 pm

Fri Jan 30, 2015 1:44 pm

I have a spread sheet that can calculate the speed in each gear vs rpm.

Post you tyre size and I will work it out either at the weekend or early next week.
2.8 development thread http://www.e30zone.net/modules.php?name ... c&t=170822

m3.3.1 m20 thread - now running, chip needed - any volunteers?
http://www.e30zone.net/modules.php?name ... =viewtopic&
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