Re: Off idle transistions

[Shannen Durphey <shannen@grolen.com>]

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
> > --------------------------------------------------------------------------
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> 
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