Ford Mustang Forum - View Single Post - rwhp for shelby and roush
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post #10 of (permalink) Old 06-06-2014
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Joined: Apr 2012
Location: Las Vegas
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Originally Posted by Fatopotomus View Post
15% is the standard rule of thumb for parasitic loss. It would be a little bit more for an auto. But a dyno is a dyno, there are many factors that go into producing a final RWHP. There is weather, temperature, mechanically variation on the dyno, mechanical tolerances in the particular engine.

But 15% is a decent guesstimate for what crank HP will translate to at the rear.

I don't think a percentage is an accurate rule of thumb for parasitic loss. Say you have an engine with 500 hp in a car and take that 15% parasitic loss, you have 425 to the wheels (75 hp loss). Now say you have a 1,000hp engine in the same car; taking that same 15%, you would have 850 to the wheels (150 hp loss). How did the same drivetrain just take 75 more hp to spin?

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