Altitude Compensation

[Markus Strobl]

> Does anyone do any altitude compensation?  Because, as altitude
> increases, not only does the air mass density decrease, but the
> percentage of oxygen decreases (simple physics - check books
> before questioning or flaming) and the oxygen decrease is independent
> of the density decrease.  

The PCM in my '96 GM car has barometric pressure as an input, so it
seems it's used. 


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Markus '96 Z28 w/ mods. Proof that OBDII is not the end of performance.