TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
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I just recently purchaced a 1992 Camaro RS with the 305cid and TBI. I would like to do a few things to upgrade the outstanding performance that I am receiving from this excellent vehicle, however, I don't want to have to play around with the computer due to the fact that this is a daily driver/date vehicle for my wife and I.
What I would like to do is install a mild camshaft, Edelbrock Performer TBI intake, and a good set of headers to dual the exhaust. My question is this, what camshaft would be good for a mild boost in power that would work well without messing with the computer and would complement the intake and headers?
I would appreciate any assistance that can be found.
My computer knowledge does not extend much past turning one on and off. My mechanical experience stems from a ground up rebuild of a 1965 Shelby. Needless to say I have been overwhelmed by the ammount of information in the DIY PROM area, not to mention I don't understand a single thing being said in that part of the forum. I have tried the search feature to no avail.
I have all confidence that I can add the parts within a few hours without difficulty, but the computer stuff scares me more than entering a house with a hostage situation and being armed with only a water gun.
Bore the 3704 tbi manifold to at least 46mm like the stock manifold and port it (stock manifold also has a "cross" flow bore).
I really suggest you get an EBL flash in first place, will teach you how to tune, tune and bring the TBI to life.
Its not like you cant drive the car wenn you are tuning, EBL includes the stock bins whaiting to by uploaded, driven and coustomized with some volumetric efficiency learns that the EBL calculates by itself.
Tuning the stock lo3 with full exhaust will give way better results then, swapping manifold, wery mild cam and exhaust all together without tune.
And you dont even get dirty
are the bores of the 3704 manifold even smaller than the stock one?
what about that cross flow bore you mentioned, and did you just gasket-match the ports of the manifold?
thanks
i'm also going to use the EBL Flash for tuning which i have absolutely NO idea about, at least not yet but i'm convinced that this for sure is the way to squeeze the most juice out of it. you probably wont get good drivability, performance and economy if you dont tune it. the ebl shouldn't be too hard to understand because of it's VE Learn as already mentioned by thomas.
Bore the 3704 tbi manifold to at least 46mm like the stock manifold and port it (stock manifold also has a "cross" flow bore).
From what I understand, the bores on the 3704 are the same size as stock bores 1-11/16".
CamaroCop:
Pretty much anything you do beyond intake & headers will result in a need for a computer tune. If you want to avoid tuning and still pick up some power & performance, I'd suggest that you do the following:
This is a fairly decent setup and should do good unless you really want to go hog wild crazy.
4. Port your intake and heads. Now, I don't know how much this will affect the car with respect to tuning, but it should be fine.
5. Give the car a good tune up and you should be good to go.
If you are interested in tuning, look into getting an EBL. Forum member RBob makes it and is more than happy to answer any questions you have about it.
From what I understand, the bores on the 3704 are the same size as stock bores 1-11/16".
I dont think GM used a better intake manifold for export, but you can mesure and inspect yours.
Stock intake manifold is 46mm and has a "crossflow" bore between the 2 bores.
Edelbrock 3704 is 42mm and has no crossflow. I bougt 2 3704, the last one approx 1 jear ago.
Quote:
Originally Posted by 89_RS
CamaroCop:
Pretty much anything you do beyond intake & headers will result in a need for a computer tune. If you want to avoid tuning and still pick up some power & performance, I'd suggest that you do the following:
This will ensure that you are getting the proper amount of fuel to the TBI and allow room for future upgrades.
The bigger TB will require some serious tuning, higer fuel pressure requires tuning too.
Stock manifold supports 250hp for sure, stock TB 280hp and injectors with the adequate fuel pressure 300hp.
Under 300hp you dont need a 255lph fuel pump for a tbi.
The second one is for a 350 swap but the other mods can apply to your 305.
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I dont think GM used a better intake manifold for export, but you can mesure and inspect yours.
Stock intake manifold is 46mm and has a "crossflow" bore between the 2 bores.
&
The bigger TB will require some serious tuning, higer fuel pressure requires tuning too.
Not trying to argue, just telling him what I've read on here. There was thread a couple months ago about the Edelbrock TBI v. Holley Pro-Jection and the guys was talking about having to bore out the Edelbrock from 1-11/16" to 2" to work with his Holley TBI. Heres a few threads about the Edelbrock TBI:
From what I understand, the Holley TBI is a direct replacement to the stock TBI and thats my understanding from both Holley and TGO. Also, wouldn't the new AFPR compensate for the increased fuel flow? Set it to stock pressure and the excess fuel goes back to the tank. I could be completely wrong as I am still learning, but I was giving my opinion based on what I currently know.
I have a 50mm Eddy intake and I have had good success with it. It can be done easily if there is a competent shop in your town that can bore it out that deep.
but i'm convinced that this for sure is the way to squeeze the most juice out of it. you probably wont get good drivability, performance and economy if you dont tune it. the ebl shouldn't be too hard to understand because of it's VE Learn as already mentioned by thomas. 
