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Re: ECM calibrations for upgraded Xfire
Bruce,
Sorry. I wasn't yelling. I was trying to find a way to differentiate my
answers from your questions so it would be easier for you to scan.
I am intrigued by your message regarding the gray color. I cannot be sure
that it isn't the result of the original black with now a leaner mixture.
Exhaust pipes also show similar signs, not sooty at all. The motor sounds
quite strong and idles well at 750-800 rpm. it also pulls well into the low
5g range and much quicker than before. So I can't imagine that the mixture
and timing is that far off. No sign of detonation as previous either. I do
believe that at least "cruise" can be leaned out somewhat
Dominic
----- Original Message -----
From: "Bruce Plecan" <nacelp@bright.net>
To: <gmecm@diy-efi.org>
Sent: Thursday, August 10, 2000 6:22 PM
Subject: Re: ECM calibrations for upgraded Xfire
>
> Why the yelling?.
>
> > ORIGINAL FOR VETTE APPLICATION WITH 2 DIFFERENT INJECTORS FRONT/REAR
>
> <snip>
>
> > I BELIEVE THE STOCK INJECTORS ARE 66LBS/HR. WHAT ABOUT CHANGING FUEL
PUMP
> TO
> > 1985 WITH 24 LBS AND BUMPING REGULATOR TO 13-15LBS??
>
> The late cop cars had 65s, the pickups 55, and the Cross fires were
reported
> smaller yet.
>
> > > Remote fuel pressure regulators, one vacuum referenced, TB plumbed in
> > > pararel not series
> > ADVANTAGE ?AND REQUIRES SEPARATE REGULATORS?
>
> It gets away from the staggered silliness (IMHO) that GM did with the
> original design. For a lopo setup fine, but approching 1Hp/CID is no
longer
> lopo.
> Main point was that my maps wouldn't be anything similiar to what your
> running.
>
> > Nor EGR tunnel.
> > DRIVEABILITY AND EMISSIONS??
>
> OK, what about them <g>
>
> > > !/4" lid spacer to increase plenumm volume.
> > ANY SOURCES FOR SPACER?
>
> Hardware store.
>
> HOW ABOUT TBI SPACERS INSTEAD?
>
> I included that in tuning doc.
>
> > Cut back runner roofs 5/8".
> > DONE
> > > Different IAC Pintles (custom)
> > > Different air filters.
> > USING K&N
>
> > > Differences in vehicles has a tremendous influence in the tuning, and
I
> > can
> > > quarantee you you'd be better off starting with something close, as
you
> > have
> > > then what I had.
> > > Bruce
> >
> > Thanks Bruce. Some of these mods appear very interesting. Did you ever
try
> > re-routing the air destined for radiator by cutting radiator shroud and
> > sealing opening to channels for air lid?
>
> Nope, I've spent hours and hours on "ram air", and accurately measuring
> performance and correcting fuel and timing, with no real return for
> investment. Maybe on some engine bay config.s it would help. But, when
they
> do work it's more often correcting a wrong calibration
> The above ref street cars
> Grumpy
>
> > WHEN YOU SAY "GREAT CHIP FOR THAT CAR" WHERE WOULD YOU START?
> > >
> > >
> > > >
> > > > Thanks,
> > > >
> > > > Dominic
> > > >
> > > >
> > > > Original Message -----
> > > > From: "Bruce Plecan" <nacelp@bright.net>
> > > > To: <gmecm@diy-efi.org>
> > > > Sent: Wednesday, August 09, 2000 10:14 PM
> > > > Subject: Re: ECM calibrations for upgraded Xfire
> > > >
> > > >
> > > > >
> > > > > Nope, was years ago.
> > > > > The info available now, makes my early stuff look premitive.
> > > > > If you care to spend the time, you can do a great chip for that
car.
> > > > > Will take more then a chip to get the full performance out of your
> set
> > > up.
> > > > > You'll need to do 2" butterflies, remove the egr tunnel, increase
> the
> > > > plenum
> > > > > volume, different injectors, to get it's full potential.
> > > > > Grumpy
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > > I have posted using plain text. Do you have a bin file of the
one
> u
> > > used
> > > > > for
> > > > > > the 13.7 time?
> > > > > > Thanks,
> > > > > > Dominic
> > > > >
> > > > > > From: Bruce Plecan
> > > > > > Turn off that awful script / coloring.
> > > > > > I've run a 13.7 with a cross fire.
> > > > > > Try reading tuning docs (at the FTP), and programming 101.
> > > > > > For a combo like that, you'll need to do your own chip, and just
> > start
> > > > > with
> > > > > > a stock one or what ever ya bought from them.
> > > > > > Some major (yet non critical) intake porting needs done
> > > > > > Grumpy
> > > > >
> > > > > > From: Dominic Sorresso
> > > > > > I am new to your forum but it was strongly suggested by a member
> of
> > > the
> > > > > > Xfire forum that I join.
> > > > > > I recently "upgraded" my 84 Vette Xfire with a Comp Cam hyd
roller
> > > > 211/218
> > > > > > degree with .488/495 lift at 112 degree lobe separation. I also
> > > upgraded
> > > > > the
> > > > > > heads to the new
> > > > > > Trick Flow 23 degree aluminum heads. Also have upgraded ECM and
> TBI
> > > > units
> > > > > to
> > > > > > Turbo City
> > > > > > systems ie 7747 ECM. I also have Extrude Honed manifold. On a 95
> > > degree
> > > > > day,
> > > > > > car ran a 14.3 at 99.7mph and pulled 253 hp@4600rpm/307
> lbft@4200rpm
> > > at
> > > > > the
> > > > > > rear wheels on chassis dyno. This was with stock configuration
> chip.
> > I
> > > > am
> > > > > > interested in knowing if anyone has a bin file for a combination
> > > similar
> > > > > to
> > > > > > this. I don't doubt that knock Sensor was causing retard of
> timing
> > > > since
> > > > > > power went south after 4600rpm. I have a Needhams EMP-10 burner
> and
> > > > would
> > > > > > be interested in mainly suggested fuel and timing calibrations.
I
> > > > believe
> > > > > it
> > > > > > is running slightly rich especially at cold idle strartup and
> would
> > > also
> > > > > > like to address dis/engagement of 4+3 OD unit at higher speeds.
> > > > >
> > > > >
> > > >
> > >
> >
>
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