Intake & Exhaust Questions and info regarding various aftermatket exhaust systems for the G35 (Headers,Y-Pipes, and Cat-Back Systems)

Question about Wheel horse power

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Old Oct 5, 2008 | 03:20 PM
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Question about Wheel horse power

How much is 6 wheel horse power. Is it about 15 hp from the engine. New to this stuff trying to learn a little. Sorry for all the uestions. Thanks.
 
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Old Oct 5, 2008 | 03:28 PM
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it depends on the drivetrain loss and other factors

roughly about 25% for Gs i think
 
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Old Oct 5, 2008 | 07:08 PM
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15% is reasonable accurate on the G.

6WHP is within the error range on a dyno.
 
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Old Oct 5, 2008 | 07:23 PM
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So how would i figure the actual HP is with those %. Thanks
 
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Old Oct 6, 2008 | 01:10 PM
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Unfortunately driveline friction losses are not level and vary with rpm and all fluid temperatures plus tire temperatures.

So it is impossible to state a specific friction loss [ as a %] without specing an rpm and temperature for every variable.

Most approximations are wishful ranges that assume the publish numbers are correct when engines actually vary by +- 5 HP and lb/ft from unit to unit when brand new.

The factory actually measures 5-20 units and gives either best peak or high average.
 
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Old Oct 6, 2008 | 01:12 PM
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Originally Posted by eric1111
So how would i figure the actual HP is with those %. Thanks
the only real way to get a car's actual WHP is to take it to a dyno.

and even then, there's still small variables that will make small differences.
 
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