Altitude compensation (Re: 286 Vindication)

[Tommy.Palm at oron.ds.sll.se]

>Isn't it true that for a speed density efi system with an _absolute_ MAP 
>sensor, then altitude compensation is not needed?  For example, if you 
>changed altitude, the barometric pressure changes, which changes the 
>pressure in the manifold, which the MAP sensor directly measures. 
> Temperature (air density) compensation is still needed.
>
>Now for a efi system using the "trap door" air flow meter, I believe 
>altitude compensation is needed.  In addition to temperature  compensation.
>
>Bryan Zublin
>bzublin at gi.com
>
I certannly agree to this, I got very confused about the double absolute
statement earlier.

Tommy