[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: Miniram Backfire Update II
If I were you Jason. I would have all of the votes that booted you from the
list recounted, and then hand counted, and then hand printed, then hand
stuffed in the voting box, and before you know it you will be back on the
list......Welcome back
> -----Original Message-----
> From: JN [SMTP:jwn@sgi.net]
> Sent: Wednesday, November 15, 2000 1:13 PM
> To: gmecm@diy-efi.org
> Subject: Fw: Miniram Backfire Update II
>
> I was booted from the list so if were any responses can someone forward
> them
> to me?
>
> Thank you,
> Jason
> ----- Original Message -----
> From: "JN" <jwn@sgi.net>
> To: <gmecm@diy-efi.org>; "Romans, Mark" <romans@starstream.net>; "Walter
> Sherwin" <wsherwin@home.com>; <timsiford@hushmail.com>
> Sent: Monday, November 13, 2000 9:20 AM
> Subject: Miniram Backfire Update II
>
>
> > Good Morning,
> >
> > I have worked and worked this weekend to chase this problem burning
> over
> > 12 chips in one day. First I have basic question before I go any
> further.
> > Do you have to clear the ECM (disconnect the battery) every time you
> change
> > the chip? Anyway, the only table GMEPro has for Acceleration fuel is:
> > AE fuel vs change in LV8
> > AE fuel vs coolant temp
> > AE fuel decay rate
> >
> > I have been fooling with the first one. I popped in the new 30 pound
> > injectors and set the constant to 33lbs for double and single fire
> modes.
> > At idle I was a little rich with 45 psi (vacuum line off) at the rail.
> > Block learns at about 110. Pulse widths at 1.3 or so at 800 RPM.
> Anyway,
> > the stock values for this table are:
> > LV8 Factor
> > 0 .125
> > 64 .125
> > 128 .156
> > 192 .203
> > 256 .203
> >
> > I increased these numbers by 25%, 50% etc, until I just jammed the
> > maximum allowed (.99) in the first 3 slots (0,64,128) just to see what
> > happened. Well that was too rich or course but at least it didn't
> backfire.
> > I backed them down to .750 and then I get the hesitation again. I tried
> > values in between but when I cover the initial opening, it created a
> whole
> > other problem. The problem is two fold. First during initial opening,
> the
> > flat lean condition is covered but as you keep the throttle moving down,
> it
> > hits PE (50% TPS) and BIG TIME richness! Motor runs like crap and black
> > smokes. Second, and this one is interesting. Advance the throttle in
> say
> > 4th to say 1.75 volts, O2 volts stay up and no lean condition. All of
> a
>
> > sudden, while keeping the throttle in a fixed position, the AE seems to
> > decay out and it goes way, way lean and backfires to beat hell. Why?
> Well
> > while in AE mode the ECM is yanking fuel out like crazy because its
> rich.
> > After the AE decays, the Block learn is like 108 and the INT climbs
> skyward
> > to try and add fuel and within a few seconds it gets enough in there to
> stop
> > the backfiring. ????????
> >
> > So it seems I need a table that is TPS related and not LV8 related.
> Just
> > like this car needs and accelerator pump. Does Tunercat have a table
> like
> > this? I was also thinking of decaying the AE much faster so as to not
> > affect the fuel trims so drastically. Any thoughts or suggestions?
> >
> > Thanks,
> > Jason Norris
> >
> >
> > ----- Original Message -----
> > From: <timsiford@hushmail.com>
> > To: "Walter Sherwin" <wsherwin@home.com>; "JN" <jwn@sgi.net>
> > Sent: Sunday, November 12, 2000 8:27 AM
> > Subject: Re: New Spreadsheet
> >
> >
> > > I absolutely agree.
> > >
> > > The only other idea that just got mentioned on the list (but I have
> also
> > > been thinking of) is changing the delta TPS that is needed to enter PE
> > mode.
> > > What do you think Walt?
> > >
> > > Tim
> > >
> > > At Fri, 10 Nov 2000 17:31:24 -0800, "Walter Sherwin"
> <wsherwin@home.com>
> > > wrote:
> > >
> > > >
> > > >To me it looks like the throttle gets opened suddenly, the mixture
> falls
> > > >flat on its face, and she probably backfires as a result? I'd guess
> > > >and say
> > > >that a whole bunch more initial tip-in AE fuel is needed.
> > > >
> > > >I'm not sure what you have at your disposal in your MAF cal, but I
> > > >know
> > > >that in the MAP stuff I play with there are usually two components of
> > > >AE
> > > >fuel, each with their own set of tables and modifiers. The first
> > component
> > > >is TPS based, and gets dumped in right away to cover the initial bog
> > > >hole.
> > > >The second part is MAP based and gets blended in as the TPS based
> stuff
> > > >decays away.
> > > >
> > > >I'd say you need much more "TPS" type AE fuel.
> > > >
> > > >The secondary ignition system is in good working condition right?
> > > >
> > > >Take Care;
> > > >Walt.
> > > >
> > > >
> > > >
> > > >----- Original Message -----
> > > >From: <timsiford@hushmail.com>
> > > >To: "JN" <jwn@sgi.net>
> > > >Cc: <wsherwin@home.com>
> > > >Sent: Friday, November 10, 2000 7:16 AM
> > > >Subject: Re: New Spreadsheet
> > > >
> > > >
> > > >> JN,
> > > >>
> > > >> This new spreadsheet is very interesting. I have highlighted a few
> > > >sections
> > > >> in ORANGE. These sections show you opening the throttle and the O2
> > > >volts
> > > >> going down to zero indicating a lean condition. You said that you
> > > >have
> > > >> modified the pump shot. Which table are you referring to? Are you
> > > >using
> > > >> TunerCat? What ECM definition file are you using with TunerCat?
> > > >If you
> > > >> want - you can always send your BIN to me and I'll take a quick
> look
> > > >at
> > > >> it. I CC'd Walter on this one because he was interested in your
> first
> > > >XLS
> > > >> file.
> > > >>
> > > >> Tim
> > > >>
> > > >>
> > > >> At Fri, 10 Nov 2000 09:59:47 -0500, "JN" <jwn@sgi.net> wrote:
> > > >>
> > > >> >
> > > >> >
> > > >> >Tim,
> > > >> >
> > > >> > Take a look at this new spread sheet. At the bottom there is
> > > >a
> > > >recording
> > > >> >where the backfire happened. Get a load of the O2 volts.
> Interesting
> > > >> >huh?
> > > >> >
> > > >> >Jason
> > > >> >
> > > >> >
> > > >
> >
> >
> --------------------------------------------------------------------------
> --
> > 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
*********************************************************************************
This E-mail and any of its attachments may contain Exelon Corp. proprietary
information, which is privileged, confidential, or subject to copyright
belonging to the Exelon Corp. family of Companies. This E-mail is intended
solely for the use of the individual or entity to which it is addressed. If
you are not the intended recipient of this E-mail, you are hereby notified
that any dissemination, distribution, copying, or action taken in relation
to the contents of and attachments to this E-mail is strictly prohibited
and may be unlawful. If you have received this E-mail in error, please
notify the sender immediately and permanently delete the original and
any copy of this E-mail and any printout. Thank You.
*********************************************************************************
----------------------------------------------------------------------------
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