1984 Corvette CFI
Thread Starter
Cruising
Joined: Feb 2022
Posts: 12
Likes: 2
1984 Corvette CFI
Hello all, I just bought a 1984 corvette with crossfire injection. I’ve already deleted the cats and just have performance mufflers. I’ve just deleted the egr on it and I am soon to delete the smog pump. I have questions about getting the CFI to run correctly with a ported intake. From what I’ve read you can get the later fuel pump and a new regulator to increase the fuel pressure which can help it run correctly. I have also heard about hyper chips but these seem to be a waste. I’ve also heard about the EBL flash 2 ecm but I don’t wanna spend that much money if I don’t have to. So my question is, what is the best way to have the crossfire injection running correctly with a ported intake, deleted egr, and no cats.
Le Mans Master
Joined: Aug 2017
Posts: 6,943
Likes: 1,490
From: New Jersey
Borrow a wide band and adjust fuel pressure would be the simplest way. It should be pretty close on a stock ecm with just a ported intake. @Tom400CFI had one running quite well on a 400 as a matter of fact. When mine was just a renegade it ran fine with the stock calibration and fuel pressure bumped up to 14 psi too.
You're not drastically altering it's air flow demand so the ecm should be close to its programed operating range anyway. When you start doing cams and all that stuff then you have to look into making drastic changes but a ported intake will work just fine.
You're not drastically altering it's air flow demand so the ecm should be close to its programed operating range anyway. When you start doing cams and all that stuff then you have to look into making drastic changes but a ported intake will work just fine.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
You should be fine, even with the factory regulator and pump....unless the pump is failing. CFI-EFI (RIP), ran the most heavily ported CFI intake I've ever seen (by far), full dual exhaust, "free mods" and a converter. Later, we bored the TB's and gained nothing. He ran solid mid 14's @~96 mph (at 4500' elevation) over and over and over. At sea level his car could kiss 13's. He did this with the stock regulator (adjusted to "feed it what it wanted") and stock fuel pump.
The later fuel pump is a different/better design and can support more volume and pressure, but the stock '84 pump is also sufficient for a mild engine...if working correctly. The "idea" for moving to the later pump is that if you're CFI pump IS actually failing to meet the demand (pressure drops off under load), then if you're replacing the pump anyway, get the later pump; it's bolt-in, about the same price....no down side. But there isn't a NEED for a later pump, simply b/c you ported your intake.
Pro
Joined: Oct 2001
Posts: 682
Likes: 23
From: loxahatchee fla
reading a few links and sub links generally will provide you with a good deal more useful info to base choices on.
http://garage.grumpysperformance.com...e-vette.14173/
http://garage.grumpysperformance.com...85/#post-99393
http://garage.grumpysperformance.com...640/#post-5467
http://garage.grumpysperformance.com...e-vette.14173/
http://garage.grumpysperformance.com...85/#post-99393
http://garage.grumpysperformance.com...640/#post-5467
