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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!

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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