Originally Posted by
the Wasp
sorry for the edit !
when I researched cams for my friend's 400 Chevy (460HP) I read that an engine's Peak Torque Point is where the engine's Power is most "efficient", yet with that I also read that a racer can benefit if he over Rev's his Peak Torque Point by 200 to 400 RPM (BTW, Mr, Isky said that)
Jim
You "over rev" an engine when making a 1/4 mile pass to get higher in the power band in the next gear after the shift or you want to get your maximum HP onto the track 300' before the traps. We aren't shifting gears here or over revving for .5 seconds before shutting down..
A better example would be using 4.56 gears in a road race when you know that you will be over revving for extended periods at top speed.
I think I know a little about peak HP and power/gearing.
My 2006 Charger 5.7 Hemi made Maximum HP @ 6250 (426 RWHP and 460'# RWTQ @ 4600) I shifted @ 6500 but the .323 gears (4.55 final drive ratio in 3rd gear) had me crossing the traps @ 6250. I would have liked to have seen 6500 @ the traps. A 3.31 (4.67 FDR in 3rd) would have been near perfect.
Bear in mind this is a 4300# car at the line and it was driven, sometimes as much as 800 miles to the track.It got up to 26 MPG on the hi-way.