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I'm saying that the altitude correction factor for a naturally aspirated car and a turbocharged car are not the same. Turbocharged cars do not lose as much HP with altitude as naturally aspirated cars do. Therefore when you apply an altitude correction factor (that is meant for naturally aspirated cars) to a turbo car's dyno, the numbers will come out falsely high. At 5,280 feet, a NA car will lose about 18 percent of its power, while a certain turbo car may lose 11 percent. When the NA cars dynos and you add the standard 18 percent correction factor back onto its number, things come out even. But when the turbo car dynos and you add the 18 percent back onto its number, you get a number which is too high.
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