Spec Racer Ford Speed Versus RPM
Here is a plot of speed versus rpm in each gear
for the Spec Racer Ford. The results vary slightly depending on
tire pressure and the amount of tread on the tire since the tire
radius changes, but for BFG tires with shaved and slightly worn
tread at 28 psi hot these numbers should be pretty close:
First gear is about 191 rpm per mph.
Second gear is about
103 rpm per mph.
Third gear is about 72 rpm per mph.
gear is about 54 rpm per mph.
Fifth gear is about 41 rpm
Transmission Gear ratios:
Final Drive ratio:
Typical loaded tire radius:
For an on-line Speed versus RPM Calculator, as well as an explanation
of the equations, see my on-line calculator page at:
Speed versus RPM Calculator