| I actually agree with Chip that the numbers should be uncorrected, since that's what you're actually running. But if you did want to make an accurate altitude correction factor, you'd have to take the amount of boost you're running into account. The more boost you run, the percentage of power you lose compared to sea level decreases. I'll give you a short example to explain why: Say you're running in Denver like my previous example. With an NA car, it's easy. Sea level is 14.7 psi, Denver is 12.3 psi. You're always going to be producing 83.6% of what you made at sea level. Easy to make a correction factor with that steady number. With a turbo car running 7 psi in Denver, you'd have 12.3 + 7 psi= 19.3 psi compared to the sea level car at 14.7 + 7 psi = 21.7 psi. You'd be making 88.9% of what you made at sea level. Now you turn up your boost to 15 psi. You'd have 12.3 + 15 = 27.3 psi compared to 14.7 + 15 = 29.7psi. So now you'd make 91.9% of what you'd make at sea level. Increase your boost to 30 psi, it would be 12.3 + 30= 42.3 psi, compared to 14.7 + 30 = 44.7 psi. That would be 94.6% of what you had at sea level. So you can't have a universal correction factor that works across the board with a forced induction car. The correction factor would have to be tailored to each car, dependant on how much boost it's running. Hope that helps.
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