[Diy_efi] Speed-density vs. MAF/MAP...

[Jeffrey Engel]

Adam,

The Ford 2.3l turbo also uses RPM and TPS when it pegs
the VAF, so there must be some sort of reason to do
it.

Am I still supposed to call you a Dumbass?  <grin>

HTH,

Jeff Engel
--- Adam Wade <espresso_doppio at yahoo.com> wrote:
> >From my thoughts and reading, I had always been
> under
> the impression that it made more sense to use
> speed-density for SMALL throttle openings and lower
> engine speeds, as MAP sensors bounce around at small
> airflows on 4-cyl. engines (and they take time to
> respond, I understand), and a TPS would be far more
> sensitive in terms of recording changes in load... 
> And that at high engine speeds/WOT, a TPS was rather
> insensitive, but the airflow was sufficient and
> steady
> enough to get a good reading from a MAF/MAP.
> 
> But I was doing some reading for the book I am
> writing, and I see Kawasaki does it exactly
> BACKWARDS,
> on two different systems made by two different
> manufacturers (Mitsubishi and Denso).  They use
> MAP/IAT for SMALL throttle openings and low engine
> speeds, and speed-density (TPS + RPM) at HIGHER
> engine
> speeds and larger throttle openings.
> 
> Am I missing something fundamental here?  Or is this
> really as ass-backwards as it looks to my eyes?
> 
> Someone tell me I'm being a dumbass.  ;)
> 
> =====
> | Adam Wade                       1990 Kwak Zephyr
> 550 (Daphne) |
> |  
>
http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/
>   |
> | "It was like an emergency ward after a great
> catastrophe; it  |
> |   didn't matter what race or class the victims
> belonged to.   |
> |  They were all given the same miracle drug, which
> was coffee. |
> |   The catastrophe in this case, of course, was
> that the sun   |
> |     had come up again."                    -Kurt
> Vonnegut     |


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