Some theories

[peter paul fenske]

Not really

BARO - MAP = VACUM

With MAF well MAP * Cyl vol * INVTemp * RPM = MAF.
or PV=RNT

ECMS don't measure these parms. THEY CALCULATE EM

:peter


At 04:04 PM 8/28/98 -0400, you wrote:
>There are some big fibs being told, by the ecms.
>
>This whole topic about the O2 has me thinking about something I
>saw.  That the egr calculations are done against vacuum.  How can
>that be, since it's just MAP that's measured.   Then this item about the
>WOT, and the in car driving down the road barometric pressure
>recalculation.  Pay real close attention when driving a 747 and at
>slightly more than a little accleration, say just enough to extend the
>shift to over 4000 rpm you can feel it happen,  least I think that
>when it happens.
>
>   Then I'll bet ya dollars to donuts the universal prom reading editing
>program just uses different file extensions to make the change.
>GM specific, here.
>
>Then last night was doddling with the bench 730 ecm, and while
>wired up as a MAP it was doing MAF/MAP calculations,  both
>numbers seemed real.  So for the moment and till I see other
>wise, I think the whole MAP/MAF issue is dead, at least in my
>book, as far a better calculations.
>
>Cheers
>Bruce
>
>
>