Originally Posted by wes
Originally Posted by Bosch-Man
...what speed would i be goin with std rear diff ratio and std gearbox on 215/40/17 fronts and 235/40/17 rears at 7500rpm 7800rpm and 8000rpm
I assume my car could pull atleast 7500rpm in top!
In theory (235/40 x 17):
7500 - 186
7800 - 194
8000 - 199
You have to factor in wind resistance and tyre resistance etc, so knock about 10 mph off those speeds for a truer indication.
you dont have to factor in wind resistance,,,, if the car is pulling the revs it will be doing that speed
theres nothing that can slip to give a loose between the engine (revs) and the wheels
