RWHP to HP @ the crank? - Ford Mustang Forum
 
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post #1 of 7 (permalink) Old 07-09-2006 Thread Starter
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RWHP to HP @ the crank?

I use to know (which means I've forgotten, right) how to compute the dyno rwhp to BHP or horsepower at the crank. This is after all how the car companies and some aftermarket tuners advertise. I can't remember...is it 18 or maybe 22% lost from crank to rear wheels?
I've also forgotten the formula.

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post #2 of 7 (permalink) Old 07-09-2006
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I like 18% or so loss for a RWD stickshift car.

So if we have 350 at the crank, 350*(1.0-.18)= 350*.82= 287 hp at the wheels.

Or going from RWHP to [email protected] crank 287 rwhp/.82= 350 at the crank.

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post #3 of 7 (permalink) Old 07-09-2006
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Ofcourse ther are things you can do to lower the percentage. Such as using light weight smaller diameter wheels, aluminum driveshaft, lightweight flywheel.

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post #4 of 7 (permalink) Old 07-09-2006
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The standard is 15% for manual transmission and 20% for automatic.

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post #5 of 7 (permalink) Old 07-09-2006
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I think bone stock GTs dyno at around 260-270 range depending on transmision. 300 HP to the crank, and 30-40HP loss is not that bad.
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post #6 of 7 (permalink) Old 07-09-2006
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I wouldent doubt that they are pushing more along the lines of 310 at the crank stock under ideal conditions.
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post #7 of 7 (permalink) Old 07-10-2006
 
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Ford underated the S197 Mustang to not screw things up like in 1999 and with the RX-8... Stock they are making 310-315 at the crank...
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