84 CFI to TBI
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Joined: Jan 2011
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From: Haverhill Ma
84 CFI to TBI
My 84 was kind of hacked when I got it and was running a carb. I have since traced all the wires down and installed a single tbi(I chose this route as it was much more cost effective than trying to get a crossfire).
I have everything running well but my throttle and tv cable are kind of out of line.
The stock tbi bracket(from a 90 camaro i think) sits on the far back bolt of the intake manifold. This configuration makes the throttle cable way too short to reach the throttle body. It has enough overall length that I can use it if I had a proper bracket to hold it. Has anybody done this swap and had this same problem? How did you manage to fix it? ie what brackets did you use.
Also the TV cable is majorly short. It does not reach anything at all. I am fairly certain I will probably have to replace it with a longer one.
Any and all help is appreciated. Thanks.
I have everything running well but my throttle and tv cable are kind of out of line.
The stock tbi bracket(from a 90 camaro i think) sits on the far back bolt of the intake manifold. This configuration makes the throttle cable way too short to reach the throttle body. It has enough overall length that I can use it if I had a proper bracket to hold it. Has anybody done this swap and had this same problem? How did you manage to fix it? ie what brackets did you use.
Also the TV cable is majorly short. It does not reach anything at all. I am fairly certain I will probably have to replace it with a longer one.
Any and all help is appreciated. Thanks.
Instructor
Joined: Apr 2011
Posts: 161
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From: NW CT
My 84 was kind of hacked when I got it and was running a carb. I have since traced all the wires down and installed a single tbi(I chose this route as it was much more cost effective than trying to get a crossfire).
I have everything running well but my throttle and tv cable are kind of out of line.
The stock tbi bracket(from a 90 camaro i think) sits on the far back bolt of the intake manifold. This configuration makes the throttle cable way too short to reach the throttle body. It has enough overall length that I can use it if I had a proper bracket to hold it. Has anybody done this swap and had this same problem? How did you manage to fix it? ie what brackets did you use.
Also the TV cable is majorly short. It does not reach anything at all. I am fairly certain I will probably have to replace it with a longer one.
Any and all help is appreciated. Thanks.
I have everything running well but my throttle and tv cable are kind of out of line.
The stock tbi bracket(from a 90 camaro i think) sits on the far back bolt of the intake manifold. This configuration makes the throttle cable way too short to reach the throttle body. It has enough overall length that I can use it if I had a proper bracket to hold it. Has anybody done this swap and had this same problem? How did you manage to fix it? ie what brackets did you use.
Also the TV cable is majorly short. It does not reach anything at all. I am fairly certain I will probably have to replace it with a longer one.
Any and all help is appreciated. Thanks.
If your TBI really is off a camaro then you may have to upgrade the injectors.. TBI only came on the 305's. 350s where TPI. 350 TBI only came in trucks.
Team Owner
Joined: Aug 2004
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From: Park City Utah
How was the TV cable hooked up to the carb? Locations should be pretty darn similar as the TBI unit...
-Tom
Last edited by Tom400CFI; Jul 1, 2011 at 12:20 PM.
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From: Haverhill Ma
Your telling me lol. The throttle cable is very long. It will reach all the way to the water neck if you dont hook it up to the bracket. they were both hooked up to the bracket on the carb but both had like wire wrapped around them to make up the difference between the cable and the linkage. The whole thing was pretty rigged up. Maybe the car has the wrong cables on it? The car is 27 years old so who knows what happened to it in recent years. I am gonna try to find a store that has the stock cables in stock so I can check out the lengths etc.
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From: Haverhill Ma
Just wanted to kind of update this for anybody who might come across this post in the future. The tv cable was too short because on the cfi the linkage is (from what I can see in blurry pictures on google) in the middle of the two throttle bodies and on all the other setups it is on the drivers side. So once I replaced the TBI plate as mentioned below, the cable was still short and when hooked up stopped the throttle from opening all the way. I replaced it with a tv cable from a camaro and it now works fine.
In relation to that the TBI adapter I used to mate the TBI to the 2101 manifold I have was center mount and you need a rear mount to match the factory location like if you had a stock tbi manifold. I also replaced the throttle cable because it was so long and kind of in the way of other stuff.
So that was the deal on my problems.
In relation to that the TBI adapter I used to mate the TBI to the 2101 manifold I have was center mount and you need a rear mount to match the factory location like if you had a stock tbi manifold. I also replaced the throttle cable because it was so long and kind of in the way of other stuff.
So that was the deal on my problems.
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From: Haverhill Ma
If my car had come into my hands with the CFI I would probably have left it on the car.
Last edited by jcro61; Dec 8, 2011 at 10:00 PM.
Melting Slicks
Joined: Dec 2009
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It opens up alot of possibilities w/ different intakes, you can use any 4bbl. type intake w/ a tbi adaptor.
Holley makes a tbi intake, it has all the brackets so you can reuse your original throttle/tv cables. The best tbi to use is the 87-89 chevy truck model, w/ 350 injectors. The tps wiring is different on later years. The throttle arm maybe different too.
Holley makes a tbi intake, it has all the brackets so you can reuse your original throttle/tv cables. The best tbi to use is the 87-89 chevy truck model, w/ 350 injectors. The tps wiring is different on later years. The throttle arm maybe different too.
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From: Haverhill Ma
Melting Slicks
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Lets compare the hp ratings from the factory.
84 L83 205hp 290ft/lbs. These had 9.0 comp ratio, decent cam for the time, a some what tuned exhaust manifolds, & an exhaust system that was much better then any of the earlier cat converter systems before it.
88 Chevy tbi 5.7L 200hp 300ft/lbs. These had crappy heads, restrictive exhaust manifolds, single exhaust, & a lame cam. It does have 1/2 of compression over the L83.
Low end might be alittle less, but throttle response is improved. Power band is wider.I think these tbi systems like intakes with less plenum volume, kinda like a 2bbl carb that makes great torque. The crossfire intake has a large plenum & high velicity runners, they just cant move enough air/fuel at higher engine speeds.
84 L83 205hp 290ft/lbs. These had 9.0 comp ratio, decent cam for the time, a some what tuned exhaust manifolds, & an exhaust system that was much better then any of the earlier cat converter systems before it.
88 Chevy tbi 5.7L 200hp 300ft/lbs. These had crappy heads, restrictive exhaust manifolds, single exhaust, & a lame cam. It does have 1/2 of compression over the L83.
Low end might be alittle less, but throttle response is improved. Power band is wider.I think these tbi systems like intakes with less plenum volume, kinda like a 2bbl carb that makes great torque. The crossfire intake has a large plenum & high velicity runners, they just cant move enough air/fuel at higher engine speeds.
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From: Haverhill Ma
Racer
Joined: Jul 2011
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From: Austin TX
I just completed this swap aswell, im happy with it. It will be alot better with some tuning to the ECU.
http://www.youtube.com/watch?v=XfisT...A&feature=plcp
http://www.youtube.com/watch?v=XfisT...A&feature=plcp