[Stan Weiss]

OK, lets talk acceleration rate.

I have a manual trans. (clutch) car traveling a long at constant velocity. I push the gas pedal to the floor and accelerate to the red line. Where was the max. acceleration rate as data logged on the G meter?

a) When I first floor the gas pedal
b) Peak Torque RPM
c) Peak HP RPM
d) Red Line RPM
e) none of the above

Stan

[mike leech]

Originally Posted by Stan Weiss

OK, lets talk acceleration rate.

I have a manual trans. (clutch) car traveling a long at constant velocity. I push the gas pedal to the floor and accelerate to the red line. Where was the max. acceleration rate as data logged on the G meter?

a) When I first floor the gas pedal
b) Peak Torque RPM
c) Peak HP RPM
d) Red Line RPM
e) none of the above

Stan

the engine accelerates faster just after peak hp

[Stan Weiss]

Originally Posted by mike leech

the engine accelerates faster just after peak hp

what has engine acceleration has to do with car acceleration?

The car, by the laws of physics or if it is data logged on a race track will have max acceleration at about peak torque.

Stan

PS - Are you dyno racing?

[slowbird]

Originally Posted by Stan Weiss

what has engine acceleration has to do with car acceleration?

The car, by the laws of physics or if it is data logged on a race track will have max acceleration at about peak torque.

Stan

PS - Are you dyno racing?

Must fast drag cars never see peak tq, they doing it wrong?

[Stan Weiss]

Originally Posted by slowbird

Must fast drag cars never see peak tq, they doing it wrong?

My example was a stick on a track. That does not have to mean 1/4 mile track which most here run. Also most here run automatics with torque converters. What happens when the engine side of the converter is turning faster than the transmission side of the converter?

These were done sometime ago for a different thread on a different form. One shows the HP and torque curve the other map rear wheel torque and RPM against MPH. Acceleration in G's in each gear will follow the rear wheel torque curves. the yellow line show peak wheel torque / max acceleration for that gear the red line shows where the wheel torque for that gear would equal the wheel torque in the next gear. A good starting point to try and shift at. Also for this example the trans gears ratio were make so there was a 90% drop between each.

Stan