Re: MAF BLM based tuning

["Dave Zug" <dzug@delanet.com>]

----- Original Message -----
From: Jim and Sharon Brady <bradyiii@shore.intercom.net>
To: <gmecm@diy-efi.org>
Sent: Tuesday, July 18, 2000 4:16 PM
Subject: Re: MAF BLM based tuning


> Dave,
>     I was asking about maxing the MAF, good thing you're not.  What is
LV8?
> Forgive my ignorance since I'm still new to this.

Thats okay, glad theres someone I can actually help.

> Is GMEPRO a piggy back
> pc?

Its a little software package written by an entheusiest that allows you to
examine and change a few values in a binary file that is structured like the
data on a couple of common GM ECM's.  the idea is that you get a prom
burner, read the calibration chip in the car-computer, then have fun
comparing the settings with some from cars with different options like rear
gears or 305 / 350 or whatever floats it.  Some enterprising people may even
be re-calibrating their factory cars to obtain cleaner emissions or better
fuel mileage etc.  Some I think are tuning for maximum power or like me, for
internal changes like more cubic inches and a different CAM.  why? because
it's there!



>I'd be interested in your notes of your tuning process.  I'd be
> particularly interested in how you burn the PROMs and how you know how and
> what to modify.

How I know how?  I DON'T!  not completely anyway... I'll never get there
without having a job at the factory for a couple years doing just that. Let
me rephrase... I'll never get there.

>I'm using 24lb SVO injectors and so far so good.  Sure
> beats the hell out of paying twice as much for GM injectors.  Here is the
> lowdown on my car:  1990 4 bolt main Chevy Truck block, SCAT stroker crank
> balanced both rotating and recipricating mass, 5.7 inch rods, Wiseco 9.3:1
> comp forged pistons,  SLP cam #51006(approximately 270adv.dur.) roller
cam,

Wow 270.. thats probably more like what the engine needs.. Mine is 224 INT I
think.(a ZZ4 crate cam)  383 is more tolerant to duration according to
Lingenfelter's book. I like the idle I get.. completely stock personality.

> Edelbrock Performer Aluminum heads with roller rockers and 24lb SVO
> injectors w/fuel pressure regulator.  Did I leave anything out?  Oh, also
my
> 6 speed is a Borg-Warner aftermarket unit.  The reason I went with
somewhat
> low compression with aluminum heads is that I plan to add a Paxton
> Supercharger.  How is yours?  Do you still have it installed?  Keep me in
> touch.

I removed it.  the 350 CID engine ran a 13.50 with the paxton.  the 383 NA
engine runs a 13.14.  My idea was "less parts to break" so take the paxton
off and replace with displacement.

So if I have this straight, you are running a FACTORY chip??  I guess if you
have balanced the intake air increases proportionally with the injector flow
rate increase then it may work, but I'd be curious how much more emissions
legil it would be if it were tuned?

>
> Jim Brady
> '87 Monte SS 383 TPI 6 speed
> >
> > 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):
> <snip>
>
> >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
> >
>
>
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