Note that the elapse
time is the approximate time your vehicle should be running. Although
many factors influence elapse time the main factor is traction. Usually if your
vehicle does not have enough traction your elpase time will be higher than the
estimated. The other extreme is also possible and usually occurs when you are
using racing slick tires. The horsepower calculation is correct by the
definition of horsepower. Horsepower is a measure of the force required to
accelerate a weight to a known speed in a know distance. So the generate
horsepower by this calculator is the actual horsepower at the rear wheels.