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      07-15-2013, 12:30 AM   #19
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Drives: Sprint car
Join Date: May 2013
Location: California

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The weather station on this dyno is broken. If you look at the ambient pressure for your stock and 614whp runs, the dyno weather station shows 915mBar and 848mBar respectively. Both of those numbers are not possible on planet earth without being inside a tornado. So that's a sign that the dyno weather station is broken. Typical numbers will be 990 - 1030 mBar.

Because of the bogus weather station, your horsepower correction is way off too. The dyno calculated 24% correction, which is far outside of the 7% allowable specification. It looks like the real pressure at your location that day was about 1008 mBar. That would put your dyno correction factor at 4.61%, and your corrected horsepower around 517whp (assuming 494whp uncorrected is accurate).

See if there's another dyno in the area. If your uncorrected numbers are the same, then in order to use results from this shop, you'll need to get your own weather data from another source and calculate the horsepower correction by hand (or web sites will do it for you).
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