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Re: ECM calibrations for upgraded Xfire
----- Original Message -----
From: "Bruce Plecan" <nacelp@bright.net>
To: <gmecm@diy-efi.org>
Sent: Thursday, August 10, 2000 2:43 PM
Subject: Re: ECM calibrations for upgraded Xfire
>
> > I have actually done some of the things you've described. The TBI units
> are
> > 2" with stock injectors.
> Stock for what application?.
ORIGINAL FOR VETTE APPLICATION WITH 2 DIFFERENT INJECTORS FRONT/REAR
> The Extrude Hone process increased air capacity by
> > 30% along with port matching the intake and exhaust manifolds.
> And which manifold did you start with,
> The shared runner version, or the isolated?
I HAVE 5071 WITH BALANCER PORTS
> 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?
>
> 2"ers
> 95 lb hr injectors?
I BELIEVE THE STOCK INJECTORS ARE 66LBS/HR. WHAT ABOUT CHANGING FUEL PUMP TO
1985 WITH 24 LBS AND BUMPING REGULATOR TO 13-15LBS??
> Remote fuel pressure regulators, one vacuum referenced, TB plumbed in
> pararel not series
ADVANTAGE ?AND REQUIRES SEPARATE REGULATORS?
Nor EGR tunnel.
DRIVEABILITY AND EMISSIONS??
> !/4" lid spacer to increase plenumm volume.
ANY SOURCES FOR SPACER? HOW ABOUT TBI SPACERS INSTEAD?
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?
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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