Will someone please explain how you get AWHP numbers?

[Audiophobe]

Originally Posted by axispiral

lets say ur car has 400 crank hp, which is the horsepower measured at the crank, before the drive train loss, which is really hard to measure. Now, after about 25% loss you put down probs 300AWHP on the dyno. more or less. now say you put in a CFDS or an aluminum flywheel, lighter rims, they will not increase your crank HP, it will still be 400, but you may raise your dyno numbers a little bit, dropping the % loss with each upgrade. so you after all the lighter upgrades, you may dyno at 320AWHP-ish (not sure on exact numbers). make sense? those upgrades wont give you more hp at the crank, but more to the wheels.

That's why all car companies advertise crank HP. With so many cars advertising sport sedans at 300hp, I felt pretty inadequate !
(In past threads the drivetrain loss percent that was kicked around was aprrox. 28%.)
I think my car dynoed at about 365 or there abouts. So working in reverse the crank or "advertised" hp would be around 500hp! So when your friends ask and you want to impress, give the crank hp.

[boardFreak5]

Originally Posted by Audiophobe

So when your friends ask and you want to impress, give the crank hp.

Haha, please don't .

David

[lawdogg]

The dyno measures the acceleration of the roller revolutions. The acceleration of the rollers is a product of their inertia and the force being applied at the radius by the car's 4 wheels. This torque number is graphed against time, or RPM of the car, to get the torque curve.

Then, the conversion formula is applied to find the horsepower number.

Horsepower = (torque in ftlbs* rpm) / 5252