Re: ECM calibrations for upgraded Xfire

["Bruce Plecan" <nacelp@bright.net>]

Why the yelling?.

> ORIGINAL FOR VETTE APPLICATION WITH 2 DIFFERENT INJECTORS FRONT/REAR

<snip>

> I BELIEVE THE STOCK INJECTORS ARE 66LBS/HR. WHAT ABOUT CHANGING FUEL PUMP
TO
> 1985 WITH 24 LBS AND BUMPING REGULATOR TO 13-15LBS??

The late cop cars had 65s, the pickups 55, and the Cross fires were reported
smaller yet.

> > Remote fuel pressure regulators, one vacuum referenced, TB plumbed in
> > pararel not series
> ADVANTAGE ?AND REQUIRES SEPARATE REGULATORS?

It gets away from the staggered silliness (IMHO) that GM did with the
original design.  For a lopo setup fine, but approching 1Hp/CID is no longer
lopo.
Main point was that my maps wouldn't be anything similiar to what your
running.

>  Nor EGR tunnel.
> DRIVEABILITY AND EMISSIONS??

OK, what about them <g>

> > !/4" lid spacer to increase plenumm volume.
> ANY SOURCES FOR SPACER?

Hardware store.

 HOW ABOUT TBI SPACERS INSTEAD?

I included that in tuning doc.

> 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?

Nope, I've spent hours and hours on "ram air", and accurately measuring
performance and correcting fuel and timing, with no real return for
investment.  Maybe on some engine bay config.s it would help. But, when they
do work it's more often correcting a wrong calibration
The above ref street cars
Grumpy

> 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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