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Re: Saabines 281 hp is flywheel hp, not at wheels...
Posted by Eric (9-3 Hirsch) (more from Eric (9-3 Hirsch)) on Mon, 23 May 2005 13:13:49
In Reply to: Re: Saabines 281 hp is flywheel hp, not at wheels..., GM, Sun, 22 May 2005 12:43:55
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The dyno uses a rundown where the operator puches in the clutch and the dyno calculates the hp drag caused by the drivetrain up to the clutch. This loss is added to the wheel hp to give the flywheel hp. I can agree that it is probably not highly accurate but it is much better than simply saying x% loss for a given car. Heck, just by virtue of different grip levels, tires probably eat-up different levels of hp that actually turns into forward motion.
As you can see in my dyno plot from Hirsch, my car used 41.4 ps on the rundown. When added to the wheel hp of 200.6 ps, equals 242.0 ps at the flywheel. It was then corrected to standard atmospheric conditions to give 260.4 ps.
posted by 153.26.17...
9-3 Hirsch dyno
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