Question about WOT table in $8D bin
Bruce Plecan
nacelp at bright.net
Sun Nov 19 03:49:16 GMT 2000
> 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.
Downshifting, and feathering back into like in road racing, ya briefly, but
why look to detonate the motor at all?.
Spirited driving by Tahoe, I can see that as a working rpm in 4th, as in
70ish in 4th threw some twisties.
Actually 2800 rpm, and while in your specific case with a 12 Spd <g> tranny
not everyone has the open to cruise at idle.
This is getting to be in tuning 101, with the exception rather then the
general.
If you wanna endorse running timing that high as a general concept for a
SBC, OK, just I don't see the point, and not worth the risk IMO. Like the
other thread where we wound up talking about a disposabile engine.
> 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!
Again gettting to one specific example.
> 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!
Swing by, and I'll tell ya.
> 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!
Well your right back where I suggested aren't you...
> 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!
Can you refer me to where I said it didn't?...
It still would be interesting to look at the setting on an export with an
different AFR to see if anything is changed to go along with that.
At the time of that article I tried finding I think it was Jim Wolfe that
was credited with that chip. I'd be really interested in how he did that
other then as a one time 40m only deal.
bruce
> 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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