ECM calibrations for upgraded Xfire

[Gorden Jennings]

Bruce,
 
I hope this finds you doing well. I have made some progress with the DIS on
my typhoon that I would like to share and maybe get some feedback from you.
If you feel this would be better on list let me know. I have bought the prom
pac for the 3.1L Turbo Pontiac Grad Prix and have been using it in the
typhoon with pretty good success. It runs much better and the sporadic miss
that has plagued me from the start of this project has disappeared, and also
the fact if the ecm ever went into limp home mode the motor would not run
has been resolved because of the prom pac also. Just some more information
on this project. I have been moving values around to try and find the ve
tables and not found the correct area yet, dont worry I dont plan on giving
up. Looks like the DIS project does work, just it is not a plug and play if
you want all the stuff to work, especially limp home mode!!
 
I also found out some interesting interactions between different bins and
the prom pac that is plugged into the ECM. I have been tuning a friends 78
3/4 Ton 4X4 Chevy truck that we have installed a small block 400 that have
been bored over with a camero 90 TPI and a paxton blower onto, will have
pictures if you would like. I been tuning for the past couple of days. I
decided to try a 90 Vette bin ( ANHT ) with the camero prom pac and all
worked except the blm cell would go to 4 and never move no matter where the
throttle and or RPM were set. Did not get a chance to trouble shoot, just
wanted to get the truck drivable switched back to the camero bin and all was
well. During one of the bin changes I accidentally changed the bit for the
cylinder type ( TPI ) and when we started the truck get error 41 ( I may be
wrong , was cylinder select error though ) I did not know the prom pac and
the bin interacted. This has been such a great learning experience.... gotta
go meeting in about 10 minutes. Take care and hope to hear from you soon.
 

Regards

Gorden 


Original Message-----
From: Bruce Plecan [mailto:nacelp at bright.net]
Sent: Wednesday, August 09, 2000 7:49 PM
To: gmecm at diy-efi.org
Subject: Re: ECM calibrations for upgraded Xfire



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
 
 

----- Original Message ----- 
From: Dominic  <mailto:surrexi2 at home.com> Sorresso 
To: gmecm at diy-efi.org <mailto:gmecm at diy-efi.org>  
Sent: Wednesday, August 09, 2000 10:30 PM
Subject: ECM calibrations for upgraded Xfire

Hi,
 
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 at 4600rpm/307 lbft at 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.
 
Thanks for your help,
 
Dominic
surrexi2 at home.com <mailto:surrexi2 at home.com> 


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