Re: Editing proms (editorial)

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

Bruce,

You mean only change one cell at a time rather than a small group or area of
the map? What if you were to chose a "grouping" of cells within a particular
area of the curve as I discussed and applied a "universal" drop of say 1
degree? Is that prudent IYO?

Dominic
----- Original Message -----
From: "Bruce Plecan" <nacelp@bright.net>
To: <gmecm@diy-efi.org>
Sent: Friday, August 11, 2000 8:13 PM
Subject: Re: Editing proms (editorial)


>
>
> One change atta time.
> One change = one value in one map.
> Randomly changing things for the sake of change makes no sense.
> If you want to make wholesale changes, how can you tell what changed what
> where?.
> Grumpy
>
>
> > I took a look at the Main Timing tables using Tunercat and viewing the
> > graph. I see a "hump" in the
> > area of 2000-2800rpm and where the MAP kpa is 50-80%. This showed me
> > graphically what you were saying and this is the range where the engine
> > happens to live at the most. I don't think that the problem rests with
the
> > WOT region, although AFR for WOT is currently set at 12.5. But I could
see
> > that by decrementing 1-2 degrees across that particular rpm range, the
> curve
> > became smoother and lost that hump. Your advice then is to try this
small
> > change and see what happens. Is the light going on for me??
> >
> > Dominic
> > ----- Original Message -----
> > From: "Bruce Plecan" <nacelp@bright.net>
> > To: <gmecm@diy-efi.org>
> > Sent: Friday, August 11, 2000 3:40 PM
> > Subject: Re: Editing proms (editorial)
> >
> >
> > >
> > >
> > > Beleive me, I write as much as I do to make things as easy as
possible.
> > > Sometimes my answers aren't popular, but I've done a far amount of
chip
> > > burning, and talked to hundreds if not a thousand guys off list about
> > > tuning.   I also get alot of feedback.  I'll be the first also to
admit
> > when
> > > I'm wrong, thou it might take me making a real fool out of myself in
the
> > > mean time.
> > >    But, ya gotta just get your feet wet, and start, theory will just
get
> > you
> > > so far.   After doing a couple dozen, and seeing what just small
changes
> > do,
> > > you'll get (over) confident, enough to make some minor screw ups, and
> then
> > > once you relearn things a couple times then you can get somewhere.
Then
> > if
> > > you can tinker with a few other cars with what you've learned things
> will
> > > make even more sense.
> > >   It's like running the BLM limits real high and low, and letting ecm
> > learn
> > > it's way in, once you get close to having a nice been, leave the
timing
> > just
> > > right and subtract a little fuel in a couple of spots, and add toooo
> much
> > in
> > > a few others, and go for a test drive.  It will amaze you with how
> > different
> > > it feels.
> > >   That and the stall speed of the converter is enough to make a grown
> man
> > > cry at times (with a light car, higher then stock stall).   BUT, once
> you
> > > run thru it a couple times, it's like $hit, ain't nothing, but the
first
> > > couple serious attempts at a good launching chip for a Hot rod, you'll
> go
> > > why those dumb ba$tards a GMECM ain't got a clue, and then well maybe,
> and
> > > then a Owww, that's what they meant.
> > >   Grumpy
> > >
> > >
> > >
> > > > I start to understand what you mean by using the Diacom only as a
> guide
> > > such
> > > > as the example you wrote about below.
> > > > Dominic
> > >
> > > > From: "Bruce Plecan" <nacelp@bright.net>
> > > > > Well er, kinda sorta ya, some cals do have spikes in em, if you
> > consider
> > > a
> > > > > jump of 8 on one block compared to the ones aaround it
> > > > > Every once inna while to kill a knock sometimes taking a ton of
> timing
> > > out
> > > > > is better drivialiity wise with a rich spot.
> > > > > Grumpy
>
>
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