gear rpm question

[JoeBlunt]

i just went from 308s to 342s. With 308s my speedo @ 70 my rpms were aprx 2000, what should it be with the 342s @ 70???

[speedy-v6-camaro]

3.42s are approx 11% taller than 3.08s....so 2000 would be a little more than 2200.

[awesomeame]

4th gen M5 gear ratios:

1st--3.75:1
2nd--2.19:1
3rd--1.41:1
4th--1:1
5th--0.72:1

there's quite a debate whether 5th gear is .72 or .74, i'm going with .72.

also some gear/rpm related tools can be found here:

http://www.quiknet.com/~ke6vut/rpmcalc.html

http://www.f-body.org/gears

http://www.corvetteactioncenter.com/...ginespeed.html

--matt

[95Batmobile]

General rule is 400rpm per gear change.
I dunno if thats only for autos or both types.