Quote:
Originally Posted by jdasnt3
Much debate on this for the V8 as well. Some are considering that the drive train losses aren't what they used to be (approx. 15%). For instance, our SS A8 dyno'd 401/403 stock. At the usual 15% loss calc, that would put us at 460/460 which is slightly higher than the 455/455 advertised. This dyno with the 15% gives you 281. Maybe the 15% is too high with todays transmissions and drive train?
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Shouldn't be any debate. GM certifies the engine to make XXX HP/YYY TQ via a standard test.
http://standards.sae.org/j1349_201109/
If you're not comparing to the standard, your result will be flawed. An unknown chassis dyno will have many variables as well that can't be duplicated. You can influence the power figure just by the location of the tires on the rollers, how tight you strap a car down, tire pressure, etc.
Disregarding everything else I said, by coming up with 460hp and 281hp by applying the bench racing method of 15% should be well within the tolerance of said measurement method. You guys are splitting hairs over 5hp??? You can't find anything better to do?
