When the factory offers a HP rating for a car (and I understand there is a lot of fudge factor in this), are the numbers typically based on whp or measured at the flywheel?
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March 26, 2011 12:27 p.m. SVreX SuperDork
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March 26, 2011 12:29 p.m. mw HalfDork
flywheel.
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March 26, 2011 12:31 p.m. Keith SuperDork
There's not supposed to be a fudge factor, the SAE ratings are pretty specific as to how the factory tests are performed. And yes, flywheel.
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March 26, 2011 12:38 p.m. SVreX SuperDork
That's what I thought.
Thanks!
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March 26, 2011 12:44 p.m. carguy123 SuperDork
I thought when they changed the rating system they put it to the wheel and not the flywheel anymore.
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March 26, 2011 1:35 p.m. Grtechguy SuperDork
now is brake horsepower rated at the wheel or flywheel?
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March 26, 2011 2:13 p.m. Duke SuperDork
Brake horsepower is just a type of measurement device. Published figures are usually at the flywheel same as SAE.
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March 26, 2011 2:56 p.m. dogbreath New Reader
SAE-Net horsepower is measured at the flywheel and accounts for the drag of engine accessories and intake/exhaust systems.
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March 26, 2011 5:32 p.m. Moparman HalfDork
carguy123 wrote:
I thought when they changed the rating system they put it to the wheel and not the flywheel anymore.
No, when they went to net hp from gross hp, the difference was that then engine was set up as it would be installed with accessories, etc.
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March 26, 2011 8:57 p.m. stuart in mn SuperDork
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March 26, 2011 9:02 p.m. Bench Racer (BowtieBandit) Reader
Don't believe the hype, they're all completely made up.
