[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Off idle transistions



Thanks. Understood.

Dominic
----- Original Message -----
From: "Shannen Durphey" <shannen@grolen.com>
To: <gmecm@diy-efi.org>
Sent: Wednesday, August 16, 2000 6:01 PM
Subject: Re: Off idle transistions


> "Doctor, it hurts when I do this"
> "Then don't do it."  : )
> Sorry,  I couldn't help myself.  There's a reason that I told you what
> tuning software allows you to adjust the constant.  It's not in
> Tunercat.
>
> If you don't want to learn to use promedit, you can edit the value
> with hexedit, or hex workshop, or winhex, or some another hex editor,
> then run the new file through tunercat so that the checksum is
> corrected.
>
> Didn't Terry K. say that he placed a demo of GMEPro on the ftp site?
> Might start there...
> Shannen
>
> Dominic Sorresso wrote:
> >
> > 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
> --------------------------------------------------------------------------
--
> 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