Crossfire improvement advice.
Thread Starter
Advanced
Joined: Dec 2015
Posts: 64
Likes: 0
From: Orange New South Wales
I agree.
I suggested it because I know the quest for hp can be never ending. The first $2k eventually leads to another $2k and another after that.
The LS engine is much easier to get horsepower out of than than the L83.
You also do not have to use the LS engine. In my neck of the woods you can find LQ4's pretty cheaply. I've talked to guys that have done the swap in 2nd gen Camaros for under $3k.
It was just food for thought.
I suggested it because I know the quest for hp can be never ending. The first $2k eventually leads to another $2k and another after that.
The LS engine is much easier to get horsepower out of than than the L83.
You also do not have to use the LS engine. In my neck of the woods you can find LQ4's pretty cheaply. I've talked to guys that have done the swap in 2nd gen Camaros for under $3k.
It was just food for thought.
I like the idea of the LS being "easy" and there being a huge aftermarket, but at the same time it just gets the response "oh, another LS..." you get where I'm coming from? I'd like to stick with a SBC because there's a certain prestige that the LS motors don't have.
Instructor
Joined: Feb 2012
Posts: 117
Likes: 3
From: Eaton Western Australia
Crossfire improvements
Hi, I have a spare X-ram inlet manifold for sale that I used on my 84 Corvette,but have since changed to the Renegade manifold.If interested PM me as I am in Western Australia.
The manifold worked well for me,but I went a little over board and highly modified my engine,but still crossfire
The manifold worked well for me,but I went a little over board and highly modified my engine,but still crossfire
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
I have spent a small fortune on mine, currently taking a very painful crash course in transmission rebuilding due to a tv cable replacement... 
(my original tv cable broke apart in my hands).
One tip, if you find yours in the same condition, ecklers sells an excellent replacement cable, and don't buy a universal...
The universal one I got had a very cheap connector end that fell off while driving...
I can also tell you that GM's early TBI setup used dual fuel injectors like the crossfire, and they are interchangeable!
I'm currently running a set of injectors from a 454 big block from a late 80's truck, next on the list is a new computer from Dynamic EFI...
(my original tv cable broke apart in my hands).
One tip, if you find yours in the same condition, ecklers sells an excellent replacement cable, and don't buy a universal...
The universal one I got had a very cheap connector end that fell off while driving...
I can also tell you that GM's early TBI setup used dual fuel injectors like the crossfire, and they are interchangeable!
I'm currently running a set of injectors from a 454 big block from a late 80's truck, next on the list is a new computer from Dynamic EFI...
Instructor
Joined: Dec 2013
Posts: 146
Likes: 1
my kind of approach
I purchased a port CFI ported manifold on ebay and was concerned about running lean at the top end.
However, I believe you have reduced my concerns and I am going to give it a go.
Looks like you have moved the fuel pressure up 2-3 lbs over the stock regulator high pressure = more flow
Did you accomplish with the stock regulator or did you need external regulator
1984 z51 145k Automatic
However, I believe you have reduced my concerns and I am going to give it a go.
Looks like you have moved the fuel pressure up 2-3 lbs over the stock regulator high pressure = more flow
Did you accomplish with the stock regulator or did you need external regulator
1984 z51 145k Automatic
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
Pressure regulator is in the driver side (left) throttle body, and it's adjustable.
And i used fuel injectors from a big block truck from the late 80's
Those will pass more fuel, not required but it helped some issues i had with running lean.
Noting i do have a high flow exhaust, and after market heads..
From there you can bump the fuel pressure to get more fuel.
You do need to upgrade the fuel pump from a later c4
And i used fuel injectors from a big block truck from the late 80's
Those will pass more fuel, not required but it helped some issues i had with running lean.
Noting i do have a high flow exhaust, and after market heads..
From there you can bump the fuel pressure to get more fuel.
You do need to upgrade the fuel pump from a later c4
Last edited by Gibbles; Jun 25, 2016 at 11:32 PM.
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
My cfi post upgrade is wild fun.
I can leave a rubber patch with my bfg comp 2's when ever i feel the urge.
Car now takes off super fast, and i now have a powerband like a 2 stroke dirtbike.
I find my self having to give situations serious thought about possible outcomes weighing safetly vs good times...
A totally different car.
I have heads, camshaft, roller rockers, intake, long tube headers, 3in exhaust system with an x-pipe...
Other things helping are related to some mods in the trans and a tourque converter with 2400rpm stall.
If i were to buy another converter i might get a slightly higher stall...
I can leave a rubber patch with my bfg comp 2's when ever i feel the urge.
Car now takes off super fast, and i now have a powerband like a 2 stroke dirtbike.
I find my self having to give situations serious thought about possible outcomes weighing safetly vs good times...
A totally different car.
I have heads, camshaft, roller rockers, intake, long tube headers, 3in exhaust system with an x-pipe...
Other things helping are related to some mods in the trans and a tourque converter with 2400rpm stall.
If i were to buy another converter i might get a slightly higher stall...
Instructor
Joined: Sep 2013
Posts: 125
Likes: 1
renegade manifold
Hi, I have a spare X-ram inlet manifold for sale that I used on my 84 Corvette,but have since changed to the Renegade manifold.If interested PM me as I am in Western Australia.
The manifold worked well for me,but I went a little over board and highly modified my engine,but still crossfire
The manifold worked well for me,but I went a little over board and highly modified my engine,but still crossfire
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Thread Starter
Advanced
Joined: Dec 2015
Posts: 64
Likes: 0
From: Orange New South Wales
So I haven't been able to get this prject going at the moment, as it's still my struggling daily with a rabbit hole of issues.
Currently having an injector issue, which my mechanic pointed out after I got him to fix a ****ling brake system. My question here is (instead of making a new thread) are both injectors the same on the crossfire? I only have one failing injector, but I would like to replace both for a bit of future proofing. just a thing I do.
If both are the same I can happily buy both and get that sorted. but if they aren't the same, what do I look for?
Currently having an injector issue, which my mechanic pointed out after I got him to fix a ****ling brake system. My question here is (instead of making a new thread) are both injectors the same on the crossfire? I only have one failing injector, but I would like to replace both for a bit of future proofing. just a thing I do.
If both are the same I can happily buy both and get that sorted. but if they aren't the same, what do I look for?
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
So I haven't been able to get this prject going at the moment, as it's still my struggling daily with a rabbit hole of issues.
Currently having an injector issue, which my mechanic pointed out after I got him to fix a ****ling brake system. My question here is (instead of making a new thread) are both injectors the same on the crossfire? I only have one failing injector, but I would like to replace both for a bit of future proofing. just a thing I do.
If both are the same I can happily buy both and get that sorted. but if they aren't the same, what do I look for?
Currently having an injector issue, which my mechanic pointed out after I got him to fix a ****ling brake system. My question here is (instead of making a new thread) are both injectors the same on the crossfire? I only have one failing injector, but I would like to replace both for a bit of future proofing. just a thing I do.
If both are the same I can happily buy both and get that sorted. but if they aren't the same, what do I look for?
82 Crossfire injectors L83 350cid Injectors:
GM5233770*RPD (rear)
GM5233775*RPD (front)
84 Crossfire
17078827 - 84 Corvette
17078846 - 84 Corvette
You could replace with 55lb injectors on both sides and be ok though on a stock motor. I use 90lb in my 383.
Last edited by Buccaneer; Aug 8, 2016 at 12:30 AM.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
I second this. I ran same injector, both sides in mine with great results. What ever criteria GM was trying to meet w/the staggered injectors (probably emissions?)....we don't have to meet and don't care about.
Thread Starter
Advanced
Joined: Dec 2015
Posts: 64
Likes: 0
From: Orange New South Wales
They are different is size front and rear. Here are the numbers.
82 Crossfire injectors L83 350cid Injectors:
GM5233770*RPD (rear)
GM5233775*RPD (front)
84 Crossfire
17078827 - 84 Corvette
17078846 - 84 Corvette
You could replace with 55lb injectors on both sides and be ok though on a stock motor. I use 90lb in my 383.
82 Crossfire injectors L83 350cid Injectors:
GM5233770*RPD (rear)
GM5233775*RPD (front)
84 Crossfire
17078827 - 84 Corvette
17078846 - 84 Corvette
You could replace with 55lb injectors on both sides and be ok though on a stock motor. I use 90lb in my 383.
A reference site or sale page for these injectors would be good too, since I'm unsure as to what I'm looking for outside of factory parts.
Thanks!
Thread Starter
Advanced
Joined: Dec 2015
Posts: 64
Likes: 0
From: Orange New South Wales
Great! Would you be able to direct me to the ones you are using? There's a lot of different things to account for in injectors, and as an amateur I'm a bit overwhelmed. Thanks in advance!
Thread Starter
Advanced
Joined: Dec 2015
Posts: 64
Likes: 0
From: Orange New South Wales
My cfi post upgrade is wild fun.
I can leave a rubber patch with my bfg comp 2's when ever i feel the urge.
Car now takes off super fast, and i now have a powerband like a 2 stroke dirtbike.
I find my self having to give situations serious thought about possible outcomes weighing safetly vs good times...
A totally different car.
I have heads, camshaft, roller rockers, intake, long tube headers, 3in exhaust system with an x-pipe...
Other things helping are related to some mods in the trans and a tourque converter with 2400rpm stall.
If i were to buy another converter i might get a slightly higher stall...
I can leave a rubber patch with my bfg comp 2's when ever i feel the urge.
Car now takes off super fast, and i now have a powerband like a 2 stroke dirtbike.
I find my self having to give situations serious thought about possible outcomes weighing safetly vs good times...
A totally different car.
I have heads, camshaft, roller rockers, intake, long tube headers, 3in exhaust system with an x-pipe...
Other things helping are related to some mods in the trans and a tourque converter with 2400rpm stall.
If i were to buy another converter i might get a slightly higher stall...
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Thank you for your information. I couldn't find anywhere that still sells the factory 84 versions, all were discontinued. I would like to keep them factory, but if I can't, i can comfortably go for the 55lb - what is the difference between that and factory? Will it sit straight in? I'm still learning.
A reference site or sale page for these injectors would be good too, since I'm unsure as to what I'm looking for outside of factory parts.
Thanks!
A reference site or sale page for these injectors would be good too, since I'm unsure as to what I'm looking for outside of factory parts.
Thanks!
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
.
Last edited by Tom400CFI; Aug 9, 2016 at 12:34 AM.
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Instructor
Joined: Mar 2016
Posts: 171
Likes: 6
From: SW Ontario
Thanks!
Bumping this old thread so I don't have to pollute the site with a second thread asking the same thing.
I'm definitely going to get the K&N filter, as mine is rooted and chokes up my car in warm weather. For whatever nominal gain that gives, I'll be doing it,
Porting the manifold is my next step in my assumed plan, I'm hoping I can buy one so I have a spare just in case (contradicts my low-budget plans, but it's part of how i do things, always have a spare) and port that one. If I stuff it and somehow make an enormous error I'll have the stock one I can throw back on.
Catback is one of the mods I /want/ most but is the least economically feasible at the moment. The one I'm after is 750USD plus 1000+ shipping to AU. It's a mess so it'll be waiting a while.
Now rollers is something I have no experience in and need advice on. I don't understand a lot of the specs, how changing them improves performance etc. I sold my old car because I didn't know what I was doing and I'm sticking with this one so I'm determined to learn. So please explain further on the rollers thing.
I was absolutely ready to buy an 85 fuel pump and just chuck it in because it was easy to mount in place of the old pump. Now everyone's talking about timing and regulators, and that's where my ability ends. If I can unbolt something and bolt the alternative straight in I have no problems. But putting in/changing parts I know nothing about is a tightrope I don't want to walk. Can i get away with not changing the regulator? was any of that large discussion about throttle bodies relevant to my specific build at all?
Thanks.
Bumping this old thread so I don't have to pollute the site with a second thread asking the same thing.
I'm definitely going to get the K&N filter, as mine is rooted and chokes up my car in warm weather. For whatever nominal gain that gives, I'll be doing it,
Porting the manifold is my next step in my assumed plan, I'm hoping I can buy one so I have a spare just in case (contradicts my low-budget plans, but it's part of how i do things, always have a spare) and port that one. If I stuff it and somehow make an enormous error I'll have the stock one I can throw back on.
Catback is one of the mods I /want/ most but is the least economically feasible at the moment. The one I'm after is 750USD plus 1000+ shipping to AU. It's a mess so it'll be waiting a while.
Now rollers is something I have no experience in and need advice on. I don't understand a lot of the specs, how changing them improves performance etc. I sold my old car because I didn't know what I was doing and I'm sticking with this one so I'm determined to learn. So please explain further on the rollers thing.
I was absolutely ready to buy an 85 fuel pump and just chuck it in because it was easy to mount in place of the old pump. Now everyone's talking about timing and regulators, and that's where my ability ends. If I can unbolt something and bolt the alternative straight in I have no problems. But putting in/changing parts I know nothing about is a tightrope I don't want to walk. Can i get away with not changing the regulator? was any of that large discussion about throttle bodies relevant to my specific build at all?
Thanks.
We are in the same boat and I've been trying to take in all this information.
My first car was an 88 Trans Am which had CFI. I didn't mind the system then but the car was never fast and I didn't have the money for many upgrades back then.
I co-built an 89 Mustang 5.0L last summer and traded it along with some cash for my '84 Vette. I'm learning but still need assistants with some projects.
My car is tock minus a shift kit of some sort(always chirps going into second when I get on it a little)Two weeks ago I got a K & N filter for it. Car seems to run a little smoother. More top end gain. I also changed the plugs which helped. I put back in the stock ac delco's.
I am picking up the new fuel pump today and may try and install it myself. I'm waiting on my buddy who is a mechanic but he's never changed one and wont help unless we lift the car into the air. This regulator thing is a little confusing but I'll read up on it more. Once I get the pump in I'll let you know.
I most likely won't do much on the car until the fall/Winter. I plan on having the intake ported. I can get that done here in Canada for under $200.00. For me to buy a Renegade I'm looking at close to $700 with shipping and the Canadian dollar being so weak. I too am on a budget. I'll most likely look to upgrading the exhaust after that.
Keep this thread going and maybe we can continue to help each other out.
Thanks to those who have posted in this thread.
Burning Brakes
Joined: Apr 2016
Posts: 781
Likes: 73
We are in the same boat and I've been trying to take in all this information.
My first car was an 88 Trans Am which had CFI. I didn't mind the system then but the car was never fast and I didn't have the money for many upgrades back then.
I co-built an 89 Mustang 5.0L last summer and traded it along with some cash for my '84 Vette. I'm learning but still need assistants with some projects.
My car is tock minus a shift kit of some sort(always chirps going into second when I get on it a little)Two weeks ago I got a K & N filter for it. Car seems to run a little smoother. More top end gain. I also changed the plugs which helped. I put back in the stock ac delco's.
I am picking up the new fuel pump today and may try and install it myself. I'm waiting on my buddy who is a mechanic but he's never changed one and wont help unless we lift the car into the air. This regulator thing is a little confusing but I'll read up on it more. Once I get the pump in I'll let you know.
I most likely won't do much on the car until the fall/Winter. I plan on having the intake ported. I can get that done here in Canada for under $200.00. For me to buy a Renegade I'm looking at close to $700 with shipping and the Canadian dollar being so weak. I too am on a budget. I'll most likely look to upgrading the exhaust after that.
Keep this thread going and maybe we can continue to help each other out.
Thanks to those who have posted in this thread.
My first car was an 88 Trans Am which had CFI. I didn't mind the system then but the car was never fast and I didn't have the money for many upgrades back then.
I co-built an 89 Mustang 5.0L last summer and traded it along with some cash for my '84 Vette. I'm learning but still need assistants with some projects.
My car is tock minus a shift kit of some sort(always chirps going into second when I get on it a little)Two weeks ago I got a K & N filter for it. Car seems to run a little smoother. More top end gain. I also changed the plugs which helped. I put back in the stock ac delco's.
I am picking up the new fuel pump today and may try and install it myself. I'm waiting on my buddy who is a mechanic but he's never changed one and wont help unless we lift the car into the air. This regulator thing is a little confusing but I'll read up on it more. Once I get the pump in I'll let you know.
I most likely won't do much on the car until the fall/Winter. I plan on having the intake ported. I can get that done here in Canada for under $200.00. For me to buy a Renegade I'm looking at close to $700 with shipping and the Canadian dollar being so weak. I too am on a budget. I'll most likely look to upgrading the exhaust after that.
Keep this thread going and maybe we can continue to help each other out.
Thanks to those who have posted in this thread.
It is changed from the fuel filler.....easiest electric fuel pump I ever changed. No more than 20 minutes.....allowing for a 5 minute beer break.
Be sure to pick up the pump for an '85.
Last edited by divotdug; Aug 9, 2016 at 01:18 PM.
Instructor
Joined: Mar 2016
Posts: 171
Likes: 6
From: SW Ontario
Bad news for your mechanic friend, you can't change the fuel pump on an '84 if it's up on a lift......unless you are very, very tall.
It is changed from the fuel filler.....easiest electric fuel pump I ever changed. No more than 20 minutes.....allowing for a 5 minute beer break.
Be sure to pick up the pump for an '85.
It is changed from the fuel filler.....easiest electric fuel pump I ever changed. No more than 20 minutes.....allowing for a 5 minute beer break.
Be sure to pick up the pump for an '85.
I'm going to attempt it myself. I've watched couple video's on it and from what I've read here it looks fairly simple. I ordered a pump from an 85-89 and am going to pick it up shortly. I'm just read up on adjusting that FPR now.
Last edited by James84vette; Aug 9, 2016 at 01:55 PM.