hey what number do u multiply inorder to calculate WHP from crank horsepower?

 

There really isn't a calculator and there are too many variables but if you want a calculation that is somewhat close take 15% off of the crank power to the wheels for a front wheel drive car. Example tC has 160 crank with 15% off it would have approx 136 at the wheels which is close but with 12% off it will have 140 at the wheels which is just as close but a little more. These are only examples the temp, humidity, octane, type of dyno, and etc there are too many variables will play a role in what you dyno.

 

thanks for the help.