[Diy_efi] Unstable holley projection

[Perry Harrington]

Jeff,

You can plop a MegaSquirt right in there.  There are a lot
of people running TBI injection of big motors.

I wrote a program that will take a dyno chart and make a baseline
VE table for the MS, so that's a good start.

I just bring this up because there are a large number of holley
converts over on the MS list.

http://groups.yahoo.com/group/megasquirt/

--Perry

On Sat, Jun 07, 2003 at 04:03:05PM -0700, Jeff Behrens wrote:
> 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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-- 
Perry Harrington			Data Acquisition & Instrumentation, Inc	
perry at dainst dot com					 http://www.dainst.com/

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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