1984 upgrade
Thread Starter
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
1984 upgrade
Has anyone ever taken the crossfire injection out and installed tuned port injection? How involved is it? Cost? Recommendations of where to get the parts? The 84 I've got is in awesome condition and if its only gonna take a few thousand to convert it over to increase hp then I'd rather do that. Please share any input you may have.
thanks
thanks
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
It's a fair amount of work, relatively expensive, and very unsatisfying. The stock TPI doesn't breathe enough better than the Crossfire to make it a viable project. Either play with the Crossfire for a while or swap over to something the will precess a reasonable amount of air.
RACE ON!!!
RACE ON!!!
Pro
Joined: Dec 2002
Posts: 603
Likes: 0
From: 84 383 XFire Chandler, AZ
I have a 84 as well. I have heard it can be done but the gains are minimal - quite expensive and time consuming. Along with the TPI setup you will also need to change the harness and computer. The gains from what I have been told are minimal. I would image the general concensus will be buy a another Vette that already has TPI.
Have you checked out Crossfire Injection Vault ? FWIW - I am building a 383 and I will initially be using the XRam. There is a gentleman in Australia that has produced 400+ hp to the crank with a stroker and XRam. Perhaps you may want to spend your money that way.
Have you checked out Crossfire Injection Vault ? FWIW - I am building a 383 and I will initially be using the XRam. There is a gentleman in Australia that has produced 400+ hp to the crank with a stroker and XRam. Perhaps you may want to spend your money that way.
Thread Starter
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Since it doesn't seem to be worth installing the TPI, are there any modifications I can make to help increase the hp using the crossfire. I'm going to check out the crossfire injection vault website (thank you). Im not all that familiar with what I can do more with the crossfire. I have been told at one time to replace the intake to one that will accomdate a holly carb. (rather not do that though) thanks again
Racer
Joined: Jul 2002
Posts: 412
Likes: 0
From: corvallis or
Dont do it the biggest problem with the Crossfire isnt really performance its the fact that most people dont understand it because its so simple. There are many upgrades and mods to make them build more power Last year with stock internals I was able to run 14.10 consistantly This year with the 396 we will see!
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
If you want TPI, you're better off selling your xfire and buying an 85. The tpi and the dash cluster is the only difference between those years. (and the rear end if you have the stick shift.)
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Melting Slicks
Joined: Jul 2003
Posts: 2,719
Likes: 1
From: Los Angeles Ca
with everyone else, if you want TPI go 85up, or just build your x-fire. I did some work on mine and yes, I could have done better but I'm ok (for now) will do more later. Anyway it's your choice.GOOD LUCK....
Burning Brakes
Joined: Jun 2003
Posts: 937
Likes: 0
From: Bedford Tx
Forget about TPI, its restrictive, just not as
bad as crossfire.
.
Options,,,, carb, with low profile intake,,,
454 tbi, with an aftemarket intake plus adapter,,,,
'single plane' mpfi, with the tpi computer,,,
various aftermarket solutions, including TPIS miniram,,
Check your hood clearance.
.
The camshaft, is also a limitation
bad as crossfire.
.
Options,,,, carb, with low profile intake,,,
454 tbi, with an aftemarket intake plus adapter,,,,
'single plane' mpfi, with the tpi computer,,,
various aftermarket solutions, including TPIS miniram,,
Check your hood clearance.
.
The camshaft, is also a limitation
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Originally Posted by qws
Has anyone ever taken the crossfire injection out and installed tuned port injection? How involved is it? Cost? Recommendations of where to get the parts? The 84 I've got is in awesome condition and if its only gonna take a few thousand to convert it over to increase hp then I'd rather do that. Please share any input you may have.
thanks
thanks
Mate,if the car's in really good order, and the engine is really good, pull it out and put it aside and throw something else in the hole, then you get to keep the original L83 cross fire, which which would make your car worth more when you sell it if that is all stock and original.
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
Originally Posted by Casethecorvetteman
Mate,if the car's in really good order, and the engine is really good, pull it out and put it aside and throw something else in the hole, then you get to keep the original L83 cross fire, which which would make your car worth more when you sell it if that is all stock and original.
Racer
Joined: Jan 2004
Posts: 291
Likes: 0
From: Norton ma
There are many options for a 84.
I sold my crossfire and went with a mercusier efi intake, LS1 throttle body,and megasquirt with a wideband input.
You could go with a stealthram and megasquirt also, which would be rather cheap, just have to modify the plenum a bit.
The beauty of the mercusier intake is that you can use fastburn heads.
I sold my crossfire and went with a mercusier efi intake, LS1 throttle body,and megasquirt with a wideband input.
You could go with a stealthram and megasquirt also, which would be rather cheap, just have to modify the plenum a bit.
The beauty of the mercusier intake is that you can use fastburn heads.
Racer
Joined: Feb 2005
Posts: 387
Likes: 1
seriously man, I hear "don't go back in time" all the time!
Now I'm not out to diss people like CFI-EFI who are interested in maximizing what the crossfire can do, or people who maximize what a tpi can do.
That said, a carb will feed more than a crossfire or tpi could ever hope to do. Now yes, there are xrams out there (smokey even used em, w/ MUCH success - and carbs on top) that are bad, and there are tpi parts too, but the simple fact is that they will cost more than a simple carb setup.
So what are your motives? most power for smallest $$$? or maximizing what your car can do w/ what it's got?
If you put a performer rpm on there, a 750 holley, port the heads waaay out (assuming you or a friend can do this, if not, get aftermarket heads, it'll be cheaper in the long run), and stick say a Comp 274XE cam in, with long tubes and a true dual 2 1/2" exhaust, you'll be DEEP in the 12's (assuming you have traction)
Just my humble opinion. Good luck w./ your decision!
Now I'm not out to diss people like CFI-EFI who are interested in maximizing what the crossfire can do, or people who maximize what a tpi can do.
That said, a carb will feed more than a crossfire or tpi could ever hope to do. Now yes, there are xrams out there (smokey even used em, w/ MUCH success - and carbs on top) that are bad, and there are tpi parts too, but the simple fact is that they will cost more than a simple carb setup.
So what are your motives? most power for smallest $$$? or maximizing what your car can do w/ what it's got?
If you put a performer rpm on there, a 750 holley, port the heads waaay out (assuming you or a friend can do this, if not, get aftermarket heads, it'll be cheaper in the long run), and stick say a Comp 274XE cam in, with long tubes and a true dual 2 1/2" exhaust, you'll be DEEP in the 12's (assuming you have traction)
Just my humble opinion. Good luck w./ your decision!
Melting Slicks
Joined: Oct 2003
Posts: 2,951
Likes: 3
From: Mount Vernon OH
I removed my Cross Fire and switched to a carb
I saw your post and I would never switch to a TPI system going from a Cross Fire if you are looking for more performance. The time and energy will not pay you enough back to justify the effort it will require.
Depending on what your true goal is there are many other options for you. Either stick with what you have and either port your existing intake, replace the intake with something that actually flows decent like an X-ram, offy, or remove the cross fire and either bolt on a carb and intake. You could always switch to an Accel, Edelbrock system or you could have someone like John Meaney build you a fuel injection using his Big Stuff 3 system. Depending on your budget there are many options but before you start tearing into your car have a detailed plan and a budget in place. Good Luck!
Depending on what your true goal is there are many other options for you. Either stick with what you have and either port your existing intake, replace the intake with something that actually flows decent like an X-ram, offy, or remove the cross fire and either bolt on a carb and intake. You could always switch to an Accel, Edelbrock system or you could have someone like John Meaney build you a fuel injection using his Big Stuff 3 system. Depending on your budget there are many options but before you start tearing into your car have a detailed plan and a budget in place. Good Luck!
Instructor
Joined: Aug 2002
Posts: 157
Likes: 0
From: Kingsville Ontario
I did the swap.
I swapped out my Crossfire system for a TPIS Mini Ram five years ago. This project was a lot of time and money to have it look and run good. I wouldn’t recommend this type of conversion because it could cost you thousands if you are not familiar with working on cars.
