Re: ECM calibrations for upgraded Xfire

["Dominic Sorresso" <surrexi2@home.com>]

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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