Is BP Sensor needed in MAF system???

[Ron Boley]

Perry/Les,

Can you tell me if a MAF based solution precludes the need for a barometric
pressure transducer?  I have an EEC-IV system that I've been through and I
don't see an input nor an internal (EEC-IV) BP sensor.

Thanks
----- Original Message -----
From: "Perry Harrington" <pedward at apsoft.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, March 28, 2002 4:41 AM
Subject: Re: programming for a MAF based system


> On Wed, Mar 27, 2002 at 03:49:05AM -0500, Justin Becker wrote:
> > It is my understanding that the Ford EEC-IV mass-air engine control
system
> > references the BAP (ambiant manifold pressure) only at start-up, before
the
> > engine cranks. I beleive it is to determine air density (altitude in a
way)
>
> That is correct.  I find it to be a stupid design, but nonetheless...
>
> > to minimize emissions, and make the car run better in every situation.
Is
> > this true? Is there a way for the BAP to be referenced more often in the
>
> It's integral to the air density calulations.  Air temperature and
altitude
> are additive, meaning that once you get the MAF signal, you have to
process
> it with the baro data to obtain a true mass calculation.
>
> > case of adding positive manifold pressure (super/turbocharging)? How did
the
>
> No, not unless someone has reprogrammed the algorithms in the EEC.
>
> > Supercoupes reference boost (manifold pressure) in order to supplement
> > control of the air/fuel ratio as well as timing; if they did at all?
Anyone
> > have any clues?
>
> The Tbird SC did not have a MAP sensor.  The boost was proportional to RPM
and
> Ford just did all the work on a dyno.
>
> They did however have Octane adjust and knock sensors to compensate for
too
> much timing.  They did anti-knock on a per cylinder basis and adjusted
their
> timing based on the fuel octane.
>
> > Also, what is ISV?
>
> Idle stabilizer valve.  Otherwise known as IAC (Idle air control) and IAB
(Idle
> air bypass).
>
> ISV is the more boschish/digifant nomenclature.
>
> > Justin
> >
>
> --Perry
>
> --
> Perry Harrington             Linux rules all OSes.               APSoft
()
> perry at apsoft dot com                  Think Blue. /\
>
> Those who would give up essential liberty to purchase a little temporary
safety
> deserve neither liberty or safety. Nor, are they likely to end up with
either.
>                              -- Benjamin Franklin
>
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