Altitude Compensation

tom cloud cloud at hagar.ph.utexas.edu
Wed Sep 11 22:36:40 GMT 1996


>> 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. 
>

seems to me that that's what BAP (barometric atmos. press.) as opposed
to (or in addition to ??) MAP (manifold atmos. press.) does.  also,
supposedly EGO feedback accomplishes this within certain limits ??

tom cloud




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