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Re: ECM calibrations for upgraded Xfire



Mike,

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@meridian-mag.com>
To: <gmecm@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@home.com]
> Sent: Thursday, August 10, 2000 9:22 AM
> To: gmecm@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@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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