Originally Posted by murphinator
I have never tuned for elevation being here at sea level but would think as long as you use scan data from all altitudes you plan on running at so you have accurate modeling it should work.
That is totally unnecessary, as the MAP sensor's sole purpose for existing is to measure pressure, and the IAT measures temperature, which are the only relevant things to change with altitude. The only currently used EFI system that is affected by altitude is Alpha N, which is only still used on motorcycles at this point. Even that crude system is affected a lot less than you might imagine.