hey guys just picked up a stang new to me. it was dyno'd on a dynapack dyno. They have 2 charts one showing a run to 6006rpms and then one to 5000rpms(where the rev limiter is set) for the HP it says 527.5hp 551.6 ftlb I understand the numbers but it says SA fly wheel power and fly wheel torque. how do they get that and how do i figure out RWHP.

 

Flywheel Horsepower = FHP; Rear wheel Horsepower = RHP
* FHP = RHP + 17% (auto trans)
* FHP = RHP + 25% (man trans)
* RHP = FHP - 15% (auto trans)
* RHP = FHP - 20% (man trans)

 

They should be reversed. A manual tranny has a lower HP loss than an auto tranny.

 

to convert fwhp to rwhp. this is just an estimate for drivetrain loss.
fwhp*.85 (for auto)
fwhp*.88 (for manual)
to convert rwhp to fwhp:
rwhp / .85 (for auto)
rwhp / .88 (for manual)

you cant add % to the rwhp to get the fwhp bc the drivetrain loss is from the crank to the rear wheels. if you add % of the rwhp to get the fwhp, it will be incorrect bc you must do the math in reverse when starting from fwhp to rwhp. for example:
500 fwhp * 85 % = 425 rwhp
if you use the equation above:
425 + 15% (63.75)= 488.75 this is incorrect.

 

thanks guys. I am located in corning NY anyone know of a good tuner. Kennedy motorsports is the closest i know off about 3hrs from here.