Miniram Backfire Update II
JN
jwn at sgi.net
Wed Nov 15 20:50:49 GMT 2000
That's funny! I guess I should have been more clear. I don't think I was
booted, I just have not received any mail for two days. :-)
Jason
----- Original Message -----
From: <don.broadus at exeloncorp.com>
To: <gmecm at diy-efi.org>
Sent: Wednesday, November 15, 2000 2:48 PM
Subject: 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 at sgi.net]
> > Sent: Wednesday, November 15, 2000 1:13 PM
> > To: gmecm at 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 at sgi.net>
> > To: <gmecm at diy-efi.org>; "Romans, Mark" <romans at starstream.net>; "Walter
> > Sherwin" <wsherwin at home.com>; <timsiford at 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 at hushmail.com>
> > > To: "Walter Sherwin" <wsherwin at home.com>; "JN" <jwn at 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 at 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 at hushmail.com>
> > > > >To: "JN" <jwn at sgi.net>
> > > > >Cc: <wsherwin at 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 at 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
> > > > >> >
> > > > >> >
> > > > >
> > >
> > >
>
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