well the problem was that i started from a red light going on a freeway entrance ramp so that might have affected it because the acceleration was something like Acceleration*sin of ramp's angle.
anyway it measures the hp something like
HP=Speed * Acceleration * weight.
also it includes the airdrag and the weight i set it at 3250 lbs( the car is 2976lbs+ me 135lbs+ a shit load of crap that i have in my trunk).
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