That is incorrect. F = m * a. RPM/speed/velocity is nowhere in the equation.

 

 

So I'm at HP peak, change the gearing, I'm now at a higher RPM but less HP and accelerating faster. So you're telling me less HP equals more acceleration???

 

 

 

 

Good God.

a = F /m.

IT IS TRIVIALLY OBVIOUS THAT ACCELERATION ONLY HAPPENS WITH THE APPLICATION OF FORCE!

Your above post is 100%, completely correct. You're completely missing the point of this discussion, however. Anybody who disputes the basic F=ma formula has no concept of the most basic level of physics, and nobody here will dispute it.

THE CURRENT DISCUSSION IS ABOUT WHETHER THE CRANK TORQUE NUMBERS OR CRANK HORSEPOWER NUMBERS ARE THE BETTER INDICATION OF A CAR'S POSSIBLE RATE OF ACCELERATION!

When all factors are accounted for (crank torque, redline, gearing, tire size, car weight, etc.) it turns out that the pounds per hp (car weight per crank horsepower) stat is the absolute best simple correlation between those stats and various cars' relative maximum accelerations. (Wile the absolute best complex method is, of course, to run the crank torque though the gearing, tire size and the like, come up with a pounds of thrust value, which given the car's weight can be used to calculate the actual acceleration in G's. But 99% of car consumers out there would be unable to do such a calculation, I bet. Hence, the next best thing - pounds per hp. Personally, I think it'd be great if car manufactures would do the calculations for us and give us the pounds of thrust stat.)

If two cars have 10lbs per hp, they will accelerate nearly identically even if one has twice the crank torque of the other.

 

[QUOTE]Originally posted by Elistan
[B]Good God.

pounds per hp (car weight per crank horsepower) stat is the absolute best simple correlation

 

[QUOTE]Originally posted by wc_one
[B]

That is incorrect.

 

[QUOTE]Originally posted by wc_one
[B]

So I'm at HP peak, change the gearing, I'm now at a higher RPM but less HP and accelerating faster.