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Since HP is a function of torque we essentually have a fairly precise representation right there. although, if you want to get a more accurate figure things get messy. first off you cant get accurate results without having the torque curve right infront of you. with that you need to write an equation that matches the trends of that curve. after you figure that equation you would have to apply calculus and integrate the curve over the rpm range you would be useing. aka if you were launching at 3000 rpms and taking it up to a 6000 rpm redline you would set your integration limits at 3000-6000. this would give you the net amount of force for a proper comparison. of course if you dont want to calculate that you could always just take torque figures every 250 rpms or so (more or less depending on how accurate you want to be) and add those all together, that would give you an ~net torque value that could be used to calculate. either way to properly factor you would need the entire torque curve
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