[Diy_efi] Unstable holley projection

[Joe Lutz]

I'm not real familiar with holley projection, but I ran into a similar 
problem when tuning a Motec system.   The accel enrichment (pump shot) 
sensitivity was set to high causing the system to sporadically induce pump 
shot.

Joe

From: Jeff Behrens <jwg94 at yahoo.com>
>Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>Subject: [Diy_efi] Unstable holley projection
>Date: Sat, 7 Jun 2003 16:03:05 -0700 (PDT)
>
>My projection 4Di system has a glitch in it.  If you
>hold the throttle down around 2000 or so it will run
>fine and then the injectors will dump in a bunch  and
>then run fine and then they will simply shut off for a
>second and then go back to normal.  It is very
>unstable for some reason. I am even running in open
>loop just trying to get the *&^$%&^%*%^ thing street
>worthy.  If anyone has seen this I could really use
>some help  Also does anyone know where I could get a
>fuel map for my engine if I gave all the specs?
>
>
>Jeff
>Automation specialist
>--- Carter Shore <clshore at yahoo.com> wrote:
> > On Sat, 7 Jun 2003 14:02:24 -0400 Mr Motor wrote:
> >
> > >one thing i'm not sure about is if this is going to
> > >work for what i want it to do. Do you know how IAT
> > >sensors actually work? electrically?
> > >it says in this link that "Examples of low level
> > >signals that are not suitable are directly
> > connected
> > >thermocouples, thermistors, RTDs, strain gages or
> > >strain gage-based transducers."
> >
> > Typical auto IAT temp sensors use a simple biased
> > thermistor circuit which outputs a fairly low
> > impedance voltage signal in the range of 0-5V.
> > ISTR the signal range of the WinDAC is -10V to +10V,
> > so you ought to be OK, but it will not read in
> > degrees. There are conversion charts for various
> > sensors out on the net. If it's a Ford unit, there's
> > a
> > chart in Probst's EEC-IV book p.85, also in some
> > Ford
> > Factory service manuals. Or get a thermometer and a
> > kitchen oven, and calibrate it on your own.
> >
> > I think the WinDAQ software is really first class,
> > especially at the price; 4 channels of digital
> > record/playback, filter, trigger, zoom, scale, etc.
> > If you go through the whole tutorial on the CD, you
> > can appreciate the full capability. Might even be
> > online by now.
> >
> > For example, attach a linear position sensor to each
> > wheel's suspension, then you get a full picture of
> > what the chassis is doing.
> >
> > Carter Shore
> >
> >
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