Went to the Track (bout time)

[ChrisCantSkate]

Originally posted by V8killimports
That's exactly what I mean... let's say you want 1 part air to every part fuel. You only get say .5 part air at 3000 feet, so the computer compensates for this by only giving .5 part fuel.

Maybe it's just me.. but a FI unit should compensate for this. Same with any airplane. You go up in altitude and lean the mixture.. but get the same performance than you do at lower alt.. actually better performance due to the cooler air.

it does compensate for it, but remeber at 3000 feet oxygen may only be 1000 ppm(parts per million) instead of 1500ppm or whatever(making numbers up) compaired at ground lvl. the combustion chamber can only hold X amount of air, if the o2 level is lower then the computer makes the adjustment, however it lower the amount of gas for the burn, not pull more air to level out the amount of gas that would be ideal for that rpm. less gas/air but the same ratio will yeild less power considering you run ideal at sealevel.