Question about WOT table in $8D bin

[Romans, Mark]

Hi Bruce:  If you look at where the advance is 48 degrees, it's at 4800
rpm's and very
light load, if the ecm did run in that area of the map it would be briefly.
The 15.5:1 AFR is commanded, and I suspect that it's actually a bit leaner.
I think that's why
the lean misfire at 16.0:1. Actually if you look at the factory calibration
it ran 15.1:1 commanded
in hwy fuel mode.  When I am on the freeway, in 5th or 6th gear, I'm at
either 2300 (%th) or 1600, (6th)
and very light load.  Indicated 31 mpg at 80 mph in 6th!
I do know that when I am in Hwy fuel, the 02 sensor reads less than 100 mv,
which means it's pretty lean!
How lean?  Who knows!
That part of the map is max 40 deg advance, about 70 LV8 and 1800 rpm's at
80 mph.
Seems to work ok for me!
I do remember that one of the "Real Street Eliminator" articles in Car
Craft, the winner was an El Camino
with GN drivetrain, pulled down about 36 mpg on the fuel economy test.  I
don't remember what it ran in the
quarter but it was really strong.  So hwy fuel can work!
Mark
----- Original Message -----
From: "Bruce Plecan" <nacelp at bright.net>
To: <gmecm at diy-efi.org>
Sent: Saturday, November 18, 2000 6:27 PM
Subject: Re: Question about WOT table in $8D bin


>
>
> > Hi Bruce:  That part of the map is stock 89 man trans 6E calibration.
>
> OK, still would be leary running it on a hot rod SBC.
> DIS, v-6, low compression is one thing (ie the GN I have running in mid
> 50s).
> there is a spark limit in the code of 42d, and with the initial you can
get
> to 48, but your pushing the limits of the distributor.
>
> > The stock calibration also had hwy spark added to it.  I have zeroed the
> > hwy spark because it caused trace detonation driving down the freeway.
>
> Interesting test would be to see if the detonation was in a *firing*
> cylinder or due to cross firing.   I've run the Gn up to 60d just for
grins,
> and just wound up having to add TPS for a given MPH.  Also, found that
using
> the Translator when I was able to run +-2 timing events and let temps
> stabilize running Cruise Control.  At 70 MPH can take 5 mins for the heat
to
> stalize and get a new reading on the *new TPS*.
>
> > I do have hwy fuel set at 15.5:1 at over 62 mph and light load.
> > 16.1:1 caused lean misfire.
>
> Dunno how exactly you did that, but you may have not done as much as you
> thought you did.  Just moving the commanded AFR to 15.5, or 16 might not
be
> the *whole* answer.
> Would be interesting if someone has a export chip of something hac'd where
> we could look at a couple other things
> Bruce
>
> > Mark
> > ----- Original Message -----
> > From: "Bruce Plecan" <nacelp at bright.net>
> > To: <gmecm at diy-efi.org>
> > Sent: Saturday, November 18, 2000 1:16 PM
> > Subject: Re: Question about WOT table in $8D bin
> >
> >
> > >
> > >
> > > I'd be leary about running 45 and / or more with a dissy.
> > > DIS is one thing.
> > > But, with the 5-7 issue, you might have a problem getting ready to
> happen,
> > > and some apps have a max calc spark anyway.
> > > Bruce
> > >
> > >
> > >
> > > From: "Romans, Mark" <romans at starstream.net>
> > >
> > > > Man trans, 3.45 gears, 11.1:1 compression.  Hot LT4 cam.
> > > > NO PE spark adder.  Zero detonation.
> > > > SuperRam, Ported 88 "D" port heads. TPIS Headers.
> > >
> > > >  SPARK ADVANCE TABLE
> > > > RPMX100              BIN FILE:89MARK49.BIN
> > > >                           LV8
> > > >        32  48  64  80  96 112 128 144 160 176 192 208
> > > >    4   20  20  20  20  20  20  20  20  20  20  20  20
> > > >    6   23  23  23  23  23  23  23  23  23  23  23  23
> > > >    8   23  23  23  23  23  23  23  23  20  18  18  18
> > > >   10   23  23  23  23  23  23  20  13  10     8   8   8
> > > >   12   23  23  23  23  23  23  20  13    8    1   1   1
> > > >   14   23  25  25  25  24  24  24  22  17    2   1   1
> > > >   16   23  28  34  35  29  29  26  24  21    3   2   2
> > > >   18   23  32  39  39  30  29  28  24  23      8   8   7
> > > >   20   23  37  40  39  32  32  31  25  24  26  25  24
> > > >   22   25  42  43  41  35  33  33  30  28  28  27  26
> > > >   24   25  45  46  46  42  39  36  32  30  28  27  27
> > > >   28   30  45  48  46  42  39  36  32  30  28  27  27
> > > >   32   35  45  48  46  43  39  36  32  30  28  27  25
> > > >   36   35  45  48  48  43  41  36  32  30  27  26  23
> > > >   40   35  45  48  48  43  41  37  32  30  27  26  23
> > > >   44   35  45  48  48  43  41  37  33  30  27  26  23
> > > >   48   35  45  48  48  43  41  37  33  30  27  26  23
> > >
> > >
> >
>
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