Engines do make more power at sea level, but they also make more vacuum.
I see a solid 3-4 inches change in vacuum from 5,000 ft vs ~1000 ft or less. Which in turn does affect how it's pulling on the modulator and change part throttle shift points at all light throttle angles.
At 5,000 ft I can pull away from a stop. Extremely light throttle, and basically won't even shift to 3rd unless I either hit about 30 mph or I completely let off the gas. I can keep the car at ~25 mph with light throttle and it will stay in second gear. But I need it adjusted that way up here for the setup to even work normal down at sea level. Actually I like the fact it holes 2nd like that with around town driving and no rear gear to speak of (3.07), it's at least a little more snappy when I need to accelerate without pushing so hard to force a down shift.
Shurkey I understand what you're asking and I can't explain why it's that way. 3 400 turbo cars here that all do the same thing. One has a smaller aftermarket adjustable modulator in it. Acts the same. "shrug"
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