RE: ECM calibrations for upgraded Xfire

[Mike Rolica <mrolica@meridian-mag.com>]

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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