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On 1 Sep 2004 at 22:48, John Jaranson wrote: > I looked in the Bill Fisher book too and think he was talking mostly > about correction factors to get from the chassis dyno (rear wheel HP) > figures back to flywheel HP figures. Everyone at the car show was > happy to compare rear wheel HP since that is all that really matters. > The dyno guys do use a correction factor to get things back to a > normalized air temperature and humidity since that can effect the power > figures. These factors are not all greater than 1 since it is > dependent on the ambient temperature and humidity on the day of the > test relative to the calibrated temperature and humidity. It does > allow comparisons of tests done on different days or at different times > of the day. I agree, and I think Bill Fisher would, too, that some of these corrections are necessary and proper. It was the other ones that I was talking about. It's also perfectly reasonable to go by HP to the road, but suggesting that there was a 20% loss on the way there just sounds like a way to boost everyone's bragging rights at the engine. Of course, if you're talking about a 4WD monster truck with big mud tires, 20% might actually be the right number.... ;-) -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ Shameless link for search engines: http://listarchive.type3.org ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~