[Diy_efi] Unstable holley projection

[Jeff Behrens]

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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