[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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>
> >
>
> --------------------------------------------------------------------------
> --
> > To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> > in the body of a message (not the subject) to
majordomo@lists.diy-efi.org
> >
> >
>
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo@lists.diy-efi.org
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo@lists.diy-efi.org