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Old 10-03-2002, 01:29 PM   #1
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Question what is the percentage difference between rear wheel hp and flywheel hp?

What is the percentage difference between rear wheel hp and flywheel hp?
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Old 10-03-2002, 01:43 PM   #2
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Flywheel horsepower is the measurment used by car companies. They just strap a dyno to the engines flywheel, which the the first thing the crankshaft touches.

Most people dyno their horsepower at the wheels. There is always some parasitic loss through the drivetrain to the wheels so there is less horsepower read at the wheels.

Flywheel = at the engine, more hp
Wheel = at the wheels, less hp

So an average loss is about 15% in a manual. Which means that a Camaro with 320 hp at the flywheel will have 272 at the wheels.
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Old 10-03-2002, 03:11 PM   #3
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There isn't one.

Why? Because it is exponential. The more power you have the more will be lost to the wheels - and it will not stay a fixed percentage either.

15% and 20% are generally true on a stock LS1 F-Body, but once you start upping the ante those numbers will change.

We debated this forever on LS1.com and have pages of information. I will post a link to the thread as soon as the site is back up.

Edit : http://www.ls1.com/forums/showthread...hreadid=151557

Last edited by BlackHawk T/A; 10-04-2002 at 03:38 AM.
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Old 10-03-2002, 04:02 PM   #4
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Whenever the subject has come up on LS1.com over the last few years, the general consensus ends up being about 12% for M6 and 18% for A4. The percentages are lower now than when I went to school, back in the day they were 15% and 20%, but the fact is that drivetrains are alot more effiecient today than they were 20-30 years ago when those higher numbers were considered the norm.
As long as drivetrain rotational mass doesn't change, the power loss should remain a constant percentage no matter what kind of power you have.
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Old 10-04-2002, 03:38 AM   #5
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http://www.ls1.com/forums/showthread...hreadid=151557
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Old 10-04-2002, 03:38 AM
 
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