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Technically, you don't have to turn up the boost on a turbocharger to compensate for altitude because it will do it for you. If you drive from 0 feet to 6000 feet, the boost pressure read by your boost gauge will show the same peak boost levels being reached. That's because the wastegate spring pressure doesn't change, and since it was calibrated for, say, 6psi, it will just bleed less and less air pressure off until it runs too far out of it's efficiency range. So if you were running at 6psi at sea level, it'll hold that 6psi to the mountains and back. In our particular case, the turbocharger is good up till 16psi, so you'd be very unlikely to run out of boost pressure up to typical elevations.
I know this because we tested at altitude, and I remember the drop in ambient pressure at 4000~6000 feet wasn't really that great, only 2~3psi I believe. So your 6psi at sea level setup would be running at 8~9 psi, and it should be ok up to 12 at the wastegate.
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