ECM calibrations for upgraded Xfire

[Bruce Plecan]

Gray, IMO, is you've dropped off the edge of the world.  Your combo has
reached some strange boundry, of auto ignition.  You **may** be running tooo
much timing and fuel.
Some combos can run well, like this for a while but it's not an area to
dwell in.
I'd immediately pull some timing out.
Grumpy



> You are absolutely right about plug reading. I read the plugs when I ran
it
> at the track and  they were white. The next chip change and they were
black.
> I synchronized the TB units first to establish a good baseline and now
they
> are a "grayish" color so we are getting closer and the tailpipe  is not
> very sooty. One nice thing about the Extrude Hone and the TFS 23 degree
> heads is that the mixture distribution appears to be more even as per the
> plug color.
>
> Dominic
> ----- Original Message -----
> From: "Mike Rolica" <mrolica at meridian-mag.com>
> To: <gmecm at diy-efi.org>
> Sent: Thursday, August 10, 2000 8:51 AM
> Subject: RE: ECM calibrations for upgraded Xfire
>
>
> > Each vehicle is different...
> > Also.. watch those tf head.. ive seen allot of problems with thoses
heads,
> > esp the twisted wedge suckers.. they all seem to eat valve guides!
> > You can't know anything without pulling plugs and logging data.....the
ole
> > but dyno is not the most accurate device...
> > Did you read programing 101?????? I SUGGEST YOU READ IT! it will give
you
> > allot of answers...THERE IS NO ONE TIME SOLUTION, OR QUICK FIX.
> > THERE IS NO TIMING CURVE OF FUEL CURVE BUT A MAP! THEREFORE IT CAN VARY
UP
> > AND DOWN LIKE A TOPIGRAPHIGAL MAP...
> > THEREFORE IT IS IMPERATIVE THAT YOU KNOW YOUR CAL, TEST, CHANGE ONE
THING
> > REBURN, TEST ECT.
> > A DIACOM CAN BE CONFUSING and end up making you chase your tail if ya
> don't
> > know what you are doing.. a dvm is simpler and much better. For the
> newbie..
> > To bring it into perspective,.. you would need to rent a diacom for like
6
> > months to get anywhere..
> > Mike Rolica
> > Plant A,
> > Magnesium Products Division
> > Strathroy
> >
> > (519)-245-4040  Ext. 244
> >
> >
> >
> > -----Original Message-----
> > From: Dominic Sorresso [SMTP:surrexi2 at home.com]
> > Sent: Thursday, August 10, 2000 9:22 AM
> > To: gmecm at diy-efi.org
> > Subject: Re: ECM calibrations for upgraded Xfire
> >
> > Bruce,
> >
> > I have actually done some of the things you've described. The TBI
> > units are
> > 2" with stock injectors. The Extrude Hone process increased air
> > capacity by
> > 30% along with port matching the intake and exhaust manifolds. All
> > emissions
> > is operational.
> > The TFS heads have 195cc intake runners, aluminum and 64cc chambers
> > with
> > angled plugs. I figure compression ratio went from 9.0 to 10-10.5.
> > The cam
> > is a retrofit hyd. roller with full roller rockers. Ignition is
> > using Accel
> > Supercoil and MSD6A. I went to the drags and also put vehicle on
> > dyno with
> > the stock chip from Turbo City. I believe the knock sensor was
> > retarding
> > timing and inspecting the plugs later showed they were running lean.
> > Exhaust
> > is stock with Random Tech cat/Flowmasters/ and DynoMax Y-pipe. They
> > have
> > since sent me a new chip which fattened up fuel curve and bumped
> > initial
> > advance and lowered total advance. It seems to be running well
> > although I
> > believe it is still a little rich at startup idle and at a steady
> > cruise. I
> > don' think WOT operation is very far off but I am thinking of
> > renting Diacom
> > + software to really tell. What mods had you done to yours? Can you
> > give me
> > any clue as to timing and fuel curves you had used?
> >
> > Thanks,
> >
> > Dominic
> >
> >
> > Original Message -----
> > From: "Bruce Plecan" <nacelp at bright.net>
> > To: <gmecm at 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 at 4600rpm/307
> > lbft at 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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