would there be much improvement changing a 4.10 diff to 4.27
Moderator: martauto
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HairyScreech
- Engaged to the E30 Zone
- Posts: 6265
- Joined: Sun Jan 21, 2007 11:00 pm
3.7% extra overead. so 3.7mph slower at 100.
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?
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m3.3.1 m20 thread - now running, chip needed - any volunteers?
http://www.e30zone.net/modules.php?name ... =viewtopic&
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GrindCulture
- E30 Zone Addict
- Posts: 2955
- Joined: Mon Mar 03, 2008 11:00 pm
- Location: Exeter
Oh that's not too bad on its own then, but taking into account some people have recorded up to a 10% overread already, this could make things a bit more interesting.
Not in E30s any more 
try this.......Alex wrote:i will give that one a miss then lolDHFiS wrote:How good is your maths? If you know the RPM, the gear ratio, the diff ratio and the circumference of the wheel then its fairly straight forward.Alex wrote:is there any mathematical way of calculating what rpm you will be doing at different speeds etc
rpm / gear ratio / diff ratio x 0.071 = mph
this assumes a tyre with diameter of 24 inches
In an iS top gear is 0.8 and the diff is 4.10 so at 4000 rpm
4000/0.8/4.10 x 0.071 = 86.6 mph