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RE: ECM calibrations for upgraded Xfire
Ya had bad experiences with he tw.. valve guides like to drop out for some
reason...
4 out of 8 motors we built with them ...
their cranks also suck...add another 800can to balance the wobly things...it
had to be ground cause front to rear main diff .0.0005...is okay, but would
expect more when paying that amount of money
I whent with the afr 190cc..
They are direct bolt on, and for flow results beat the hell out of most of
the other heads I've flowed..
Not only do they flow more, they are consistant across the ports, and they
flow with high velocity...
This enabled me to go with a single pattern cam, and make huge amounts of
torque..
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 10:12 AM
To: gmecm@diy-efi.org
Subject: Re: ECM calibrations for upgraded Xfire
Mike,
Thank you. That's excellent feedback especially on the Diacom.
Please
explain a dvm?? I have downloaded the Winbin and have Tunercat as
well. The
heads are the new TFS 23 degree heads that are direct bolt ons. I
had read
the same thing about the Twisted Wedge design and had thought about
the
Edelbrock heads or World heads before TFS came out with this
excellent
bargain for SBC.
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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