I've wondered what my car is putting down to the rear wheels without the benefit of a dyno. The formula to calculate HP is:
HP= (Nc * injector rating * duty cycle)/ bsfc
Where Nc = Number of cylinders and bsfc = brake specific fuel consumption. The bsfc for a supercharged engine running at an AFR of 11.8 should be about .5.
Since I can data log my duty cycle and AFR the calculation for my setup is:
HP= (8 *42 * .7)/.5 = 470 which I assume is at the crank. With a 20% loss through the drive line the rwhp = 376. Does that look about right?
HP= (Nc * injector rating * duty cycle)/ bsfc
Where Nc = Number of cylinders and bsfc = brake specific fuel consumption. The bsfc for a supercharged engine running at an AFR of 11.8 should be about .5.
Since I can data log my duty cycle and AFR the calculation for my setup is:
HP= (8 *42 * .7)/.5 = 470 which I assume is at the crank. With a 20% loss through the drive line the rwhp = 376. Does that look about right?