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post #14 of (permalink) Old 06-06-2014
Fatopotomus
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Quote:
Originally Posted by daustin View Post
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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Quote:
Originally Posted by daustin View Post
All I'm saying is that all things being the same, a percentage is not a good rule of thumb for parasitic loss.


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This is a good question and I dont think I have a solid answer. But what I can say is that a 1000 hp car and a 500 hp car wont have the same clutch an driveline (at least not for long). So as the other poster here said, perhaps a heavier duty trans needed for a 1000 hp car eats more power to turn than one fitted to a 500 hp car.

But in general is you multiply a car's advertised HP by .85, you will come pretty close to what it lays down on the dyno, rwhp wise.

2011 Mustang GT M6 3.31s

Matt HONEYCUTT Tune, Lethal Off-Road X, GT500 axlebacks, J&M LCAs, UPR UCA, Whiteline LCA relocation brackets, Eibach Pro-Kit Springs, Koni STR.T shocks/struts, GT500 strut mounts, SR Strut Tower Brace

Best 1/4 E/T (05/18/14 MIR - no tune, X-pipe, or UCA): 12.920 @ 109.40 mph (2.059 60ft)
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