1984 Corvette Removing Crossfire
Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 19
Likes: 0
1984 Corvette Removing Crossfire
Is there a good way to upgrade this engine? If I removed the crossfire injection system and that crappy intake manifold, how much work would it be to install a more modern system? Would I have to get a new PCM? Would it fit? Do the LS crate engines fit? This engine needs to be improved!
Melting Slicks
Joined: Feb 2006
Posts: 2,240
Likes: 0
From: Cleveland OHIO
What are you trying to do ? If you want more power then o.k. not a problem you can mod the crossfire you have. There is one guy on here
with an ALMOST stock 84 that is in the 13s with very little money in it.
Don't buy into the crossfire is junk bull****, I don't have one so I am not biassed but it's a s.b.c. with a misunderstood fuel injection set up is all it is. I think a crossfire that was solidly into the 12s would be really cool as MOST Corvette past or present aren't that quick.
with an ALMOST stock 84 that is in the 13s with very little money in it.
Don't buy into the crossfire is junk bull****, I don't have one so I am not biassed but it's a s.b.c. with a misunderstood fuel injection set up is all it is. I think a crossfire that was solidly into the 12s would be really cool as MOST Corvette past or present aren't that quick.
Last edited by wayne lowry; Apr 30, 2008 at 11:52 PM.
Burning Brakes
Joined: Feb 2006
Posts: 1,098
Likes: 1
From: Webster Texas
My dead stock Crossfire ran 15.3@88. Ported Crossfire intake, 1.6-1 rockers K&N Filter and the cold air mod(makes the underhood ductwork functional got my 110k+ mile car to 14.3@96. A torque converter woulda got me 13's. The Dart heads and Crane 2040 did do it. That is all without modding the ECM! Don't waste money on Chips for the 84, they are just snake oil.
Burning Brakes
Joined: Sep 2006
Posts: 1,202
Likes: 3
From: MD
An LS can be made to fit, but it's a LOT of work. Do a search for the LSx swap threads.
The '84 wiring harness doesn't support a TPI system. To run a TPI from an 85-91 vette you'd need to completely change the harness and the ECM. The easiest way to get TPI onto an '84 is to purchase a complete standalone system like the Holley Commander or the FIRST. Pricey.
Turns out that most people who complain about the '84s lack of power don't have a good running '84 to start with. It isn't hard to tune up the crossfire. A few evenings of porting on the manifold and it's easily running with stock TPI vettes. A good head/cam package, ported manifold, AFPR, and a re-tune and they're really quite quick.
Does anyone have the writeup of Dominic's '84 that was in CF a while back? I remember seeing it posted in .pdf form before. This guy needs to read it.
The '84 wiring harness doesn't support a TPI system. To run a TPI from an 85-91 vette you'd need to completely change the harness and the ECM. The easiest way to get TPI onto an '84 is to purchase a complete standalone system like the Holley Commander or the FIRST. Pricey.
Turns out that most people who complain about the '84s lack of power don't have a good running '84 to start with. It isn't hard to tune up the crossfire. A few evenings of porting on the manifold and it's easily running with stock TPI vettes. A good head/cam package, ported manifold, AFPR, and a re-tune and they're really quite quick.
Does anyone have the writeup of Dominic's '84 that was in CF a while back? I remember seeing it posted in .pdf form before. This guy needs to read it.
Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 19
Likes: 0
crossfire
Ok...it is pretty much junk considering it's a 5.7L engine getting 205 hp. It's got over 100,000 miles on it so it's not even getting that. I would like to be at 300 hp. I think that's a good solid number for this car. Could I achieve that just by getting a tune up and tweaking the crossfire system?
Melting Slicks
Joined: Feb 2006
Posts: 2,240
Likes: 0
From: Cleveland OHIO
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
Garbage compared to even TPI. Don't get me wrong, I like TBI on my k2500 truck, but the dual tbi (crossfire) on the fbody and ybody was horrible.
-- Joe
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Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 19
Likes: 0
How much work would it be to install the Commander 950 Multi-Port Fuel Injection System from Holley? Does everything drop into place, or are there a lot of modifications required?
An LS can be made to fit, but it's a LOT of work. Do a search for the LSx swap threads.
The '84 wiring harness doesn't support a TPI system. To run a TPI from an 85-91 vette you'd need to completely change the harness and the ECM. The easiest way to get TPI onto an '84 is to purchase a complete standalone system like the Holley Commander or the FIRST. Pricey.
Turns out that most people who complain about the '84s lack of power don't have a good running '84 to start with. It isn't hard to tune up the crossfire. A few evenings of porting on the manifold and it's easily running with stock TPI vettes. A good head/cam package, ported manifold, AFPR, and a re-tune and they're really quite quick.
Does anyone have the writeup of Dominic's '84 that was in CF a while back? I remember seeing it posted in .pdf form before. This guy needs to read it.
The '84 wiring harness doesn't support a TPI system. To run a TPI from an 85-91 vette you'd need to completely change the harness and the ECM. The easiest way to get TPI onto an '84 is to purchase a complete standalone system like the Holley Commander or the FIRST. Pricey.
Turns out that most people who complain about the '84s lack of power don't have a good running '84 to start with. It isn't hard to tune up the crossfire. A few evenings of porting on the manifold and it's easily running with stock TPI vettes. A good head/cam package, ported manifold, AFPR, and a re-tune and they're really quite quick.
Does anyone have the writeup of Dominic's '84 that was in CF a while back? I remember seeing it posted in .pdf form before. This guy needs to read it.
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Is there a good way to upgrade this engine? If I removed the crossfire injection system and that crappy intake manifold, how much work would it be to install a more modern system? Would I have to get a new PCM? Would it fit? Do the LS crate engines fit? This engine needs to be improved!
X-Ram Intake System see www.x-ram.com
"133" L-98 D-Port Heads (11;1 CR),ZZ4 Roller Cam,1:6 Roller Rockers,
750 CFM Bored Throttle Bodies, 8746 ECM and other goodies.
Good for at least 100+ H.P.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by CAJUN C4
My LT1 Beater has the Following:
X-Ram Intake System see www.x-ram.com
"133" L-98 D-Port Heads (11;1 CR),ZZ4 Roller Cam,1:6 Roller Rockers,
750 CFM Bored Throttle Bodies, 8746 ECM and other goodies.
Good for at least 100+ H.P.
X-Ram Intake System see www.x-ram.com
"133" L-98 D-Port Heads (11;1 CR),ZZ4 Roller Cam,1:6 Roller Rockers,
750 CFM Bored Throttle Bodies, 8746 ECM and other goodies.
Good for at least 100+ H.P.
RACE ON!!!
Pro
Joined: Jul 2002
Posts: 703
Likes: 0
From: Milwaukee Wi
I replaced my CF induction(1984) with a Holley TBI Projection manifold and a 7.4L GM TBI unit. A pretty straightforward swap. 7.4L TBI unit may be overkill for you. A smaller GM unit may suffice.
I think the XRam is not a U turn it is better described as a Z turn! I had one so I can comment.
I think the XRam is not a U turn it is better described as a Z turn! I had one so I can comment.
Last edited by Rohn; May 2, 2008 at 12:27 PM.
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
You can use the factory harness and repin it to a new ECM. You'll lose some dash functionality though.
-- Joe
Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 19
Likes: 0
I'm just looking for some sort of gauge. This car has over 100k miles on it. Typically, what kind of wear and tear should I be looking at on this powertrain? In other words, what are the typical problems associated with this engine at that age? Should I be expecting to purchase new gaskets, rings, plumbing, etc. before I invest money to improve horsepower?
Drifting
Joined: May 2003
Posts: 1,647
Likes: 28
From: Woodbridge NJ
Is there a good way to upgrade this engine? If I removed the crossfire injection system and that crappy intake manifold, how much work would it be to install a more modern system? Would I have to get a new PCM? Would it fit? Do the LS crate engines fit? This engine needs to be improved!
I'm tired of hearing/reading about the crossfire. If you don't like, sell it.
Anyone living in Jersey or near by and wants to take my car for a run, let me know.
Pro
Joined: Dec 2002
Posts: 603
Likes: 0
From: 84 383 XFire Chandler, AZ
Amen!
I keep my 84 around because of the "Crossfire is garbage" comments. I will be the first to admit that I went to the extreme and I am still working on it. "Crossfire is crap" just motivates me.
Oh by the way - I dont think the Holley commander will fit under the hood of a 84. You may want to look at that first.
I am headed to the track tonight to see if my parallel plumbing of the TBs works. If it does then I will head to the dyno. If not it is time to regroup and think of something else.
I keep my 84 around because of the "Crossfire is garbage" comments. I will be the first to admit that I went to the extreme and I am still working on it. "Crossfire is crap" just motivates me.
Oh by the way - I dont think the Holley commander will fit under the hood of a 84. You may want to look at that first.
I am headed to the track tonight to see if my parallel plumbing of the TBs works. If it does then I will head to the dyno. If not it is time to regroup and think of something else.
Last edited by elkabong; May 2, 2008 at 08:00 PM.
Le Mans Master
Joined: May 2004
Posts: 5,385
Likes: 534
Believe it or not, I'd get more satisfaction out of keeping the Crossfire and using my head to get around the setbacks and wring out the power from it. It's possible, you just need patience, planning and know-how. There's plenty on here, who have already got their hands dirty with the TBI modding and have really done a lot of work and research for you that you can actually apply to your car.
I don't believe in the "cross fire is garbage" mentality, rather much like the 4+3 it's a misunderstood red headed stepchild of the Corvette world.
I don't believe in the "cross fire is garbage" mentality, rather much like the 4+3 it's a misunderstood red headed stepchild of the Corvette world.
Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
How long have you owned the car? It seems like you bought a vehicle then realized you are not happy with the performance after $$ was exchanged. What were your expectations after purchasing it prior to buying it? I am assuming you test drove it first?? If you wanted a 300 hp car, then................
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
CFI can be a very reliable set up. I have two 84's. One thats modded and 1 thats stock. Our stock 84 has 219k on it and still runs and looks new.
Decide your goals/budget then go from there with any mods you do. They are many free mods out there if you look and do your research. Many crossfire owners went through just what you are in the beginning... then before you know your caught up in the crossfire... just like myself. Whether it is a low mileage,high mileage car you can make it a fun ride for yourself.
http://www.crossfire.homeip.net
Decide your goals/budget then go from there with any mods you do. They are many free mods out there if you look and do your research. Many crossfire owners went through just what you are in the beginning... then before you know your caught up in the crossfire... just like myself. Whether it is a low mileage,high mileage car you can make it a fun ride for yourself.
http://www.crossfire.homeip.net