Re: Off idle transistions

["Dominic Sorresso" <surrexi2@home.com>]

I can't seem to come up with that when I use Tunercat.

Dominic
----- Original Message -----
From: "Shannen Durphey" <shannen@grolen.com>
To: <gmecm@diy-efi.org>
Sent: Wednesday, August 16, 2000 5:30 PM
Subject: Re: Off idle transistions


> I find it by firing up GMEPro, loading a .bin, and scrolling through
> the fuel section to "injector constant". : )
> This is from the ASDZ disassembly.  If you download promedit and the
> 747 .ecu file, I think you'll be able to adjust this value without
> using a hex editor.
>
> BTW, this disassembly is linked from the GMECM web page.
> And you thought the archives were tough reading....
> Shannen
>
> ;----------------------------------------------
> ; LD2B4 Constant is used for fuel BPW when
> ; EGR is off.
> ;
> ; If EGR is on, table LD324 gives a different
> ; contstant vs Vacumm for EGR compensation
> ;
> ; During EGR transients the val is filtered
> ; between the two constants for smoothing
> ;
> ; Values shown for 5.7l engine:
> ;
> ; TBI:
> ; Val = 1461.5 * (VOL/RATE)
> ; VOL = Vol of 1 Cylinder in liters, (0.7125l)
> ; RATE = Injector flow in gms/sec
> : 5.7l = 7.71 gms/sec (61.2#/HR)
> ; (VOL/RATE) = 0.0924 l/gm/sec
> ; LD2B4: BPW = 135
> ;
> ; PFI:
> ; Val = 365.375 * (VOL/RATE)
> ; VOL = Vol of 1 Cylinder in liters, (0.7125l)
> ; RATE = Injector flow in gms/sec
> : 5.7l = 1.92751 gms/sec (#/HR)
> ; (VOL/RATE) = 0.3696 l/gm/sec
> ; LD2B4: BPW = 135
> ;
> ; EC PFI:
> ; Val = 365.375 * (VOL/RATE)
> ; VOL = Vol of 1 Cylinder in liters, (0.7125l)
> ; RATE = Injector flow in gms/sec
> : 5.7l = 2.331 gms/sec (#/HR)
> ; (VOL/RATE) = 0.3056 l/gm/sec
> : LD2B4: BPW = 112
> ;----------------------------------------------
>
>
> gmecm@diy-efi.org wrote:
> >
> > Shannen,
> >
> > Where do you find the injector constant? I was looking through the
tables
> > using Tunercat and could not find
> > the designation for that.
> >
> > Dominic
> > ----- Original Message -----
> > From: "Shannen Durphey" <shannen@grolen.com>
> > To: <gmecm@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
> >
> --------------------------------------------------------------------------
> > --
> > > To unsubscribe from gmecm, send "unsubscribe gmecm" (without the
quotes)
> > > in the body of a message (not the subject) to
majordomo@lists.diy-efi.org
> > >
> > >
> >
>
> --------------------------------------------------------------------------
--
> > To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> > in the body of a message (not the subject) to
majordomo@lists.diy-efi.org
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo@lists.diy-efi.org
>
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo@lists.diy-efi.org