Hi,

The way it's intended to work (requires still some experimenting) is to log a coast-down run from a given speed. The car decelerates from aero forces and friction forces. Friction can be assumed to be constant. From the changes in decel aero force and friction can be xtracted and applied to the hp/torque calculations during an accel run. aero force increases with the square of speed (requires 8 times hp to double top speed).
It's always adventagious to make 2 runs in opposite directions on the same street. Assuming weather stays constant between runs(wind speed/direction, temp), the two runs can be averaged and elements like inclines, wind force and so on eliminated.

Regards

Disregarding friction for a moment, does your software calculate the hp at any instant from the equation

hp = (mass of car)*(speed)*(acceleration)

and then the torque by using the equation

torque = (hp)*(5252)/(rpm) ?

Yes, that's the formula.

Regards,
Klaus