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Re: MAF BLM based tuning
... and a THX to the source!
----- Original Message -----
From: Bruce Plecan <nacelp@bright.net>
To: <gmecm@diy-efi.org>
Sent: Monday, July 17, 2000 9:57 PM
Subject: Re: MAF BLM based tuning
>
> > Dave: Bruce pointed out to me that the burst knock stuff is at C1BC to
> > C1C1, especially C1BF, C1C0 and C1C1.
> > Also I have always taken out the PE spark advance, what's that for
anyway!
>
> For that *seat* *of* *the* *pants* **feeling**, that your going
fast.
> Also, for a slight correction as you go to WOT AFR. But, if you real
close
> less is better.
> grumpy
>
> >
> > Mark
> > ----- Original Message -----
> > From: "Dave Zug" <dzug@delanet.com>
> > To: <gmecm@diy-efi.org>
> > Sent: Tuesday, July 18, 2000 12:02 AM
> > Subject: Re: MAF BLM based tuning
> >
> >
> > >
> > > The MAF just barely touches 231 as the automatic shifts, so NO its not
> > > maxxed. Now the LV8 rides at 255 except for a brief drop off just
> before
> > > the shifts, in a WOT run. All the talk about maxing out the MAF and
my
> > > stroker motor ain't there yet, but the E.T. numbers show it's pushing
> 350
> > > HP. If what is really meant is that the LV8 will max out, well I can
> see
> > > that.
> > >
> > > How am I modifying the prom? or what am I doing to it? How I am
> modifying
> > > it is with GMEPRO and a generic 27c128 burner. I started with ARAP as
> the
> > > base (even with the agressive timing in there, and 10:1 CR, all the
> > aluminum
> > > is forgiving to knock). What am I doing to it? well eventually,
> > embarrasing
> > > as it may be, I'll maybe post the NOTES file (a handy function in
> GMEPRO)
> > > I'm keeping... thru 15 revisions so far. Some of the notes may be
> > misguided,
> > > but it's a history of how things went. If by initial timing you mean
> > lower
> > > RPM/load timing.. the way a launch goes is like this: (in 0.1 sec
> > > intervals):
> > >
> > > Lv8 RPM
> > >
> > > 212 600
> > > 174 800
> > > 121 1400
> > > 129 1725
> > > 167 1800
> > > 214 1700 (knock)
> > > 190 2000
> > > 190 2350 (knock)
> > > 183 2550
> > > 157 2575
> > > 231 2450
> > > 223 2675
> > > 249 3300
> > > 252 3475 (knock)
> > >
> > > So you see during a drag run it passes thru mid-range territory before
> it
> > > gets to the WOT zone (208+) then stays there. the timing in the
> > > transitional areas was as much as 38 degrees. Good for while the
engine
> > is
> > > lazung around those areas, but apparently NOT good whan it is briefly
> > > transitioning thru them. I reduced timing in that area and now I get
> only
> > > ONE knock event immediately after punching the gas, then it gives all
> the
> > > timing back at the full rate... trouble is, thats 3 seconds worth and
> I'm
> > > scared to take the safety factor away. I dont really know if its
false
> > > knock or not. I tried over-fueling initially and it had no effect. I
> have
> > > not tried 110 octane yet, as a test.
> > >
> > > No mods really planned. I'm replacing the injectors with 24 pounder
> > SVO's..
> > > I wanted to see if the stockers would cover a less-than-wild TPI 383,
so
> > > others can see theres a 'budget' choice. I'm also keeping the stock
> lower
> > > intake till spring at least... too close to 12's to say I'm done ;-)
> > >
> > >
> > > Tell me more about the Monte SS.
> > >
> > > Here's mine:
> > > www.delanet.com/~tgp go to the 89 IROC page, then the 383 project
link.
> > Not
> > > very up to date, It ran a 13.14 @ 103 w/ 1.75 60' on 16" BFG Drags...
> the
> > > knock off the line is making the launch pedal-finesse un-nessecary..
> > almost
> > > like TRACTION CONTROL. I has run a few threads on EFI list and here on
> the
> > > subject of using spark table as a crude 'static' traction control
> method.
> > > Anyone who has stomped the gas pedal on a stock 305 TPI knows its
> > > frustrating to drop back 3 car lenghts while you try and feather off
the
> > gas
> > > just the right amount. The way the knock is working for me, I don't
> have
> > to
> > > think on launches... 1.75 60', not a misprint. you should see the jump
I
> > get
> > > on the 'stangs ;-))
> > >
> > > sorry for the looong.. but EFI content this time anyway.
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: Jim and Sharon Brady <bradyiii@shore.intercom.net>
> > > To: <gmecm@diy-efi.org>
> > > Sent: Monday, July 17, 2000 1:49 PM
> > > Subject: Re: MAF BLM based tuning
> > >
> > >
> > > > Dave,
> > > > Are you outflowing the MAF yet? How are you modifying your
> > ECM/PROM?
> > > > Do you think knocking you initial timing back could help your
> knocking?
> > > I'm
> > > > running 87 octane w/9.3:1 compression (aluminum heads) with no
knocks
> so
> > > > far. What mods(if any more) do you have planned for the future?
> > > >
> > > > Jim Brady
> > > > '87 Monte SS 383 TPI 6 speed
> > >
> > > <Snip>
> > >
> >
>
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> > >
> >
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