Off idle transistions

[Dominic Sorresso]

Bruce,

I am most appreciative. No problem with the archiving by the way. Thanks for
the help.
I do not have the transition slots at least not any longer. When TB City did
my units they must have replaced with the base of a TB unit that had a
single unit application because there was no center port for the balancing.
I drilled one but it is drawing vacuum from the base of the TB unit not the
nonexistent throttle plate transition slot. It is currently drawing about
18" Hg with a 750-800rpm idle.

Dominic
----- Original Message -----
From: "Bruce Plecan" <nacelp at bright.net>
To: <gmecm at diy-efi.org>
Sent: Tuesday, August 15, 2000 8:07 PM
Subject: Re: Off idle transistions


>
> > That's great info and I appreciate you sharing it with me. I think you
> know
> > I have the 747 ECM but the chip currently in it is not the stock config
> from
> > TCity.
>
> Do a file compare, and check back.
> Or forward me a copy, and I'll see what shakes.
> I will not archive it.   Justa gander.
>
>  They sent me another one once I was able to report back on the result
> > of the drag strip and dyno runs. I believe that the stock chip was
causing
> > the knock retard to be invoked big time at the top end especially in the
> hot
> > weather I was running in. I am hoping to get a bin file of the stock
chip
> so
> > I can compare to what I have now because the stock settings didn't seem
to
> > be that rich. Having said that, it appears that part of the rich
condition
> > both at cold start and cruise was the fault of unbalanced TBI units
which
> > have since been balanced. Yesterday, I bumped Fp to 10.5 and it seemed
to
> > make idle smoother although there are still times when idle will hang up
> > there until IAC's bring it back down.
> > And speaking of balancing TBI's, Bruce, you mentioned that your Xfire
had
> > the 2" units as does mine. Were you able to retain the slot in the
venturi
> > used for the balancing of the units?
>
> heehehehehehe,
> Manometers, Takes a Mercury one to do it right.  Motorcycle shops used to
be
> able to sell them before Mercury, never mind
> Anyway, just use a 1/4" piece of fuel line, and hold it near your ear, and
> compare the level of noise from one to the other, then adjust min throttle
> openings as necessary.  BTW, that's a trick from the Stromberg 97 dayz.
> Then from the transistion slot (on each connect them) run a piece or 1/8"
ID
> vac line.
> Bruce
>
>
>  If not, what did you use? I drilled
> > vacuum port which was in base and connected to center port of TBI. I am
> > assuming that it is now reading manifold vacuum. A water manometer is
> > useless.
> >
> > Dominic
> > ----- Original Message -----
> > From: "Shannen Durphey" <shannen at grolen.com>
> > To: <gmecm at diy-efi.org>
> > Sent: Tuesday, August 15, 2000 6:48 PM
> > Subject: Re: Off idle transistions
> >
> >
> > > Dominic Sorresso wrote:
> > > <snip>
> > > > Also, cold start
> > > > seems to be richer than necessary until it goes into CL.
> > > >
> > > > Dominic
> > > Dominic, I've never seen a crossfire car that didn't run rich in OL
> > > with the original ecm.  Most are so rich that they will foul one or
> > > even two plugs.  It would make sense to think
> > > TC is using the stock calibration as a base for their fuel and spark
> > > tables.
> > >
> > > Regardless, when I converted my pickup xfire to 7747, I found that the
> > > stock (7747) fuel tables for low MAP were very close, but that I've
> > > had to add additional fuel to prevent backfire during acceleration,
> > > when not in pe.  I started with a stock 350 cal, changed the injector
> > > constant, and went from there.  One other thing I did was collect as
> > > many manual trans 7747 calibrations that I could,  plugged each one
> > > into the truck, and picked the one that idled the best.  Something
> > > about re-inventing the wheel... From there I set the injector constant
> > > so it matched my engine displacement and injector size, and started
> > > driving around.  I kept track of bl and integrator #'s, and moved the
> > > injector value a little bit more to reduce the CL corrections.  After
> > > that, everything has been done in fuel and spark tables.
> > >
> > > At this point I'm wishing that I'd had springs added to the 57 spec
> > > clutch.  She'll start to slip if I'm not careful.  It was never meant
> > > to be this way...
> > > Shannen
> >
>
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