maft basic on 89+ hac sensor?

[89turbotoy]

if you run maft basic on a 89+ supra that has a hac sensor inside the ecu what will happen if you go into high altitude like 1mile or more form a couple 100 feet above sea level? does the ecu compensate or will you run really rich untill you re-tune? Could you just set it back to base and run stock tables?

[drjonez]

it shouldn't be much of an issue....but if you're really worried about it, send your ECU in for the HAC mod.