Procharger & gears....
Are prochargers similar to turbochargers in regards to gear ratios, the taller the better?? Just kind of wondering.....
I don't want to beat a dead horse here, but I have a little experience with belt-driven centrifugal superchargers (Vortec on a 360 Magnum) and have access to information about what are probably two of the very fastest turbocharged /6's on FABO (Tom Wolfe's '70 Dart and Ryan Peterson's '66 Valiant,) both of which make about 500 HP from 234 cubic inches.
My V-8 car, with the belt-driven supercharger, LIKES to spin RPM's to make power. I have it geared 4.10:1 in the rear, and that keeps the rpm's up, finishing the race at over 5,000 rpm, with maximum boost (10psi) at that engine speed. More rpm = more boost, up to a point.
The /6 turbo cars I referred to, act more like the motor in a fuel dragster, making outrageous amounts of torque when held back at medium rpm's, which is what happens with the 2.76:1 ratios they use in the differentials.
Even their 60-foot times seem to benefit from these "hiway" gears.
I know that seems very strange, but I think it has to do with the amount of exhaust gas that spins the turbo impeller.
With our similar (copy-cat) /6 car, we are going to start out with a 3.55 gear , but are putting a spool in a 2.76 center section to use, down the road.
Our local drag strip is only 1,000-feet, so quarter-mile gearing would be a little different (1,000-feet is only 75% of 1,320.)
3.55X .75 = 2.69. Not far from 2.76...
Cut and try... LOL!
