Simple Crossfire upgrades
Thread Starter
2nd Gear
Joined: Aug 2017
Posts: 2
Likes: 0
From: Chelmsford Massachusetts
Simple Crossfire upgrades
Hi everyone,
I have an 84 Corvette that I am working to get it back on the road and cleaned up. I know the crossfire injection warts and all. I wanted to see if anyone had any simple, low cost upgrades to get a little more out of the current setup. Like, one idea I had was, is it possible to swap out the crossfire manifold/TBIs for a more traditional intake with either the 350 or 454 TBI units from the pickup trucks? Would it be pretty plug and play from the injection/computer side or is it so very different that it couldn't work?
My thinking was that the biggest limitations are in the intake. I know I could spend a ton of time with a grinder to make it better, but is there some other intake that would work with the truck TBIs that could reduce/remove some of the limitations with the crossfire? A little bit of junkyard diving and swap meet wheeling and dealing to lead to an intake upgrade.
Anyone have any thoughts?
Thanks!
-Mike
I have an 84 Corvette that I am working to get it back on the road and cleaned up. I know the crossfire injection warts and all. I wanted to see if anyone had any simple, low cost upgrades to get a little more out of the current setup. Like, one idea I had was, is it possible to swap out the crossfire manifold/TBIs for a more traditional intake with either the 350 or 454 TBI units from the pickup trucks? Would it be pretty plug and play from the injection/computer side or is it so very different that it couldn't work?
My thinking was that the biggest limitations are in the intake. I know I could spend a ton of time with a grinder to make it better, but is there some other intake that would work with the truck TBIs that could reduce/remove some of the limitations with the crossfire? A little bit of junkyard diving and swap meet wheeling and dealing to lead to an intake upgrade.
Anyone have any thoughts?
Thanks!
-Mike
Drifting
Joined: Feb 2016
Posts: 1,384
Likes: 339
From: Simi Valley CA
I recently bought a project corvette that the PO was preparing to do a custom engine using junkyard parts. He was planning on using the 062 heads from the 96+ trucks. Those are about the best cast iron sbc heads chevy made. They require the vortec intake manifold or style. With your crossfire it may be able to run a 96 TBI intake as those are a single injector. I'm sure it would take some playing with, but to run a full TPI set up on your 84 would take a lot more. From what little I know about the crossfire it is 2 TBI carbs.
Le Mans Master
Joined: Aug 2017
Posts: 6,942
Likes: 1,490
From: New Jersey
A TBI intake would be marginally better. You'd probably have to extend or change harness ends for TPS sensors and perhaps the IAC but the CFI ecm should run a TBI without too much issue... That being said a later 7747 ECM would also be better... I'm unsure if the TBI fits under the stock hood either. Then you need to figure out an air cleaner.
All that for what would probably amount to 30 HP if that. Iirc the stock TBI engines were rated around 210.
Personally the intake and heads can flow more than what the engine makes in stock form. Case in point i was able to put down 275 through the stock induction setup. Obviously with exhaust, heads and the like but the intake could gain some with the typical rockers, bumped fuel pressure, and tweaked timing...
That's about the simplest where you'd actually notice a difference without the wallet being significantly lighter imo...
All that for what would probably amount to 30 HP if that. Iirc the stock TBI engines were rated around 210.
Personally the intake and heads can flow more than what the engine makes in stock form. Case in point i was able to put down 275 through the stock induction setup. Obviously with exhaust, heads and the like but the intake could gain some with the typical rockers, bumped fuel pressure, and tweaked timing...
That's about the simplest where you'd actually notice a difference without the wallet being significantly lighter imo...
Burning Brakes
Joined: Sep 2017
Posts: 939
Likes: 168
Hi everyone,
I have an 84 Corvette that I am working to get it back on the road and cleaned up. I know the crossfire injection warts and all. I wanted to see if anyone had any simple, low cost upgrades to get a little more out of the current setup. Like, one idea I had was, is it possible to swap out the crossfire manifold/TBIs for a more traditional intake with either the 350 or 454 TBI units from the pickup trucks? Would it be pretty plug and play from the injection/computer side or is it so very different that it couldn't work?
My thinking was that the biggest limitations are in the intake. I know I could spend a ton of time with a grinder to make it better, but is there some other intake that would work with the truck TBIs that could reduce/remove some of the limitations with the crossfire? A little bit of junkyard diving and swap meet wheeling and dealing to lead to an intake upgrade.
Anyone have any thoughts?
Thanks!
-Mike
I have an 84 Corvette that I am working to get it back on the road and cleaned up. I know the crossfire injection warts and all. I wanted to see if anyone had any simple, low cost upgrades to get a little more out of the current setup. Like, one idea I had was, is it possible to swap out the crossfire manifold/TBIs for a more traditional intake with either the 350 or 454 TBI units from the pickup trucks? Would it be pretty plug and play from the injection/computer side or is it so very different that it couldn't work?
My thinking was that the biggest limitations are in the intake. I know I could spend a ton of time with a grinder to make it better, but is there some other intake that would work with the truck TBIs that could reduce/remove some of the limitations with the crossfire? A little bit of junkyard diving and swap meet wheeling and dealing to lead to an intake upgrade.
Anyone have any thoughts?
Thanks!
-Mike
