Cross fire injection+big cam???
Thread Starter
4th Gear
Joined: May 2006
Posts: 4
Likes: 0
From: Dallas Texas
Cross fire injection+big cam???
I have an 82 vette who's motor recently went bad. . .
I got a new 4 bolt main block that I am building up with aluminum heads
and a lunati valvetrain. . .
The cam's lift and duration Is drasticly bigger than the stock cam. . .
I was wondering if anyone knew if it would be able to function properly
with the stock computer settings?
I got a new 4 bolt main block that I am building up with aluminum heads
and a lunati valvetrain. . .
The cam's lift and duration Is drasticly bigger than the stock cam. . .
I was wondering if anyone knew if it would be able to function properly
with the stock computer settings?
Burning Brakes
Joined: Sep 2004
Posts: 869
Likes: 1
From: Bradford Pa
in short...no...you will need to tune it
the stock ECM is pretty much a waste, so count on getting a 7747 or 8746 ecm and having a PROMinator installed and learning to do it yourself, OR finding someone who can. also, you should be running full exhaust, with a ported intake/xram and larger TB's with that combo if it's substantially more radical.
the stock ECM is pretty much a waste, so count on getting a 7747 or 8746 ecm and having a PROMinator installed and learning to do it yourself, OR finding someone who can. also, you should be running full exhaust, with a ported intake/xram and larger TB's with that combo if it's substantially more radical.
Melting Slicks
Joined: Oct 2003
Posts: 2,951
Likes: 3
From: Mount Vernon OH
Originally Posted by lunati82
I have an 82 vette who's motor recently went bad. . .
I got a new 4 bolt main block that I am building up with aluminum heads
and a lunati valvetrain. . .
The cam's lift and duration Is drasticly bigger than the stock cam. . .
I was wondering if anyone knew if it would be able to function properly
with the stock computer settings?
I got a new 4 bolt main block that I am building up with aluminum heads
and a lunati valvetrain. . .
The cam's lift and duration Is drasticly bigger than the stock cam. . .
I was wondering if anyone knew if it would be able to function properly
with the stock computer settings?
Melting Slicks
Joined: Apr 2002
Posts: 2,546
Likes: 0
From: Orlando FL
Not sure what overall cam your are interested in.. Stay as close to 15lsa with stock ECM! I have a Comp Energy Cam 168h i believe... on the 14lsa grind. I couldnt be more happier! I didnt have to do anything special to get car to run great after rebuild. Best advice - check out the crossfire vault. There is a lot of good information there regarding the xfire..
Instructor
Joined: Sep 2005
Posts: 184
Likes: 0
when I was running a CFI motor I had 2.25 injectors with 90lb ss454 truck injectorswith the 421 motor I ran 17 lbs fuel pressure but I could turn GP up to 25lbs it would overfuel at low RPM but over 65K there was no problem. With the stock injectors I was running out of fuel by 4 grand with all the fuel pressure I could get. Thats when I got discusted & built a 434 monster with a carb.If you run a flat top piston & a cam with not too much duration you should have a good street combo. I built an injected motor with268 comp &1.6s, built same setup fo neighbors el camino with a carb. He dynoed 366 hp at flywheel
