How does sest compensate for altitude changes?

[09fltr]

I was just wondering how the sest compensates for altitude changes. I had my bike tuned at sea level, but I live at 5500 ft in elevation, and sometimes ride up to 8500 ft in elevation. Had some buddies giving me crap, telling me that the higher elevation would mess up the tune.  Just wanted to know how to explain what the sest did for the elevation change.

Thanks in advance,
Tony

[Don D]

The Delphi ECU works with a built-in barometric sensor to compensate. Close loop is automatically corrected through the CL process of maintaining 14.7/1 in CL range

[09fltr]

Thanks Don.