okay so heres the scoop..I have this 1986 Iroc-z camaro and swapped out the 305 with the 350, nothing wrong with the 305 just wanted more power. I kept with the TPI system but its slower and more air restrictive than you could imagine. I dont want to spend the money on a new prom because if u do that you might as well change the restrictive TPI system. with the healthy 305 it ran 15.40s at 87 mph and with my 350 it ran 16.60 at 80 mph. its going to take some serious convincing for me to keep fuel injection, but i also want to keep the original gas tank and lines..so my question is:

What all do I have to do to convert TPI to Carberation????

Thanks, Iroc-z_23

 

dude your post makes no sence at all. what are you talking about if you get a prom you have to get a new intake?? do some research. A prom has nothing to do with the intake. A custom prom for your car will allow your car to run much better. intake is a nice upgrade but tons of people go fast with stock tpi setups.

Did you get bigger injectors than 19#? 5.7 ESC? 5.7 KS?
If you still have 19#, you could up your fuel psi to about 53, <- thats not recommended but itll run beter

I'm sure your car is running like **** because you just slapped a 305 tpi setup on a 350, did you check your timing? fuel pressure??

Carberation?? <- LOL

give us a bit more info what exactly did you do and what do you wanna do with it?

 

i have everything needed to make the swap except the prom i have 24 lbs injectors instead of the 19. tuned port injection is too retrictive for my applications so if im going to get a prom i'm getting a better intake and the intake i want from tpis.com is the mini ram and thats 1200 dollars when i can carb it for half that and get more out of it. plus if i carb it I can tune it the way i want it and not have someone program my chip everytime i make drastic changes.

the changes i made are heads, headers, new y-pipe, 3.73 gears, no cats, and ya like i said pretty much everything except intake work and prom.
F.Y.I
my heads wont perform like they should because they arent going to be able to get enough air even after a prom. i didnt pay a thousand dollars for performance heads that i'm not going to get the most i can out of.

 

i'm just trying to get the most horsepower i can and a 12.50 time slip atleast

 

^^ someones a bit of an a$$hole. lay off dude.. quit bein such a ****. shouldnt be here to bash on people and make fun of them cause they cant spell. instead, just tell him you dont understand his quesiton and ask him to go into further detail.

 

you may have better information from the carb guys. do a search and youll find plenty of stuff on switching to carb. i love carb as well, its simple.

 

good deal!! thats a start

Is this your daily driver? weekend? dragcar? street/strip?

You could go with the LT1 conversion, it performs awsome. What kind of tpi setup do you have MAF? or SD?

for carb your gonna need fuel pressure regulator, carb intake, fuel lines, new distributor new throttle cable, air cleaner

 

I would go to a carb. It makes things so much easier, its cheaper to buy all the parts needed for a carb swap than to buy a waaay overpriced fuel injection system for a tpi, and you should see better performance than fuel injection. You can still have the same fuel tank and lines you will just have to use a regulator to get the lower fuel pressure. There should be a sticky on here that tells what you need for a carb swap. If you do swap it i would go with a Edelbrock RPM Air-Gap intake-thats kind of random, but its the best carb intake for a street car in my opinion along with many others.

 

Sounds like your mind is made up

If you're not going to correctly tune the TPI, then go carb. A stock L98 performs better than that rig job

 

well its my street car and a little bit of drag racing, i was going to go with mini ram from tpis.com but i mean too much money like you said, its a MAF sensor and its never really run that great it would die at certain times, and the wiring unit just doesnt look pleasant underneath the hood even though the powdercoated tpi system looks pretty trick. thanks for the info for carbing it

 

thats actually the same intake i was looking at i've heard a lot of good things about it. what size carb do you think would be appropriate for it?

 

I agree on the intake

since you said its your street car i would go with a 650 with vacuum secondaries. also dont overlook the distributor go with a vacuum advance dizzy.

what size cam do you have??

 

its a crane cam...216/228 its max lift is .117

 

when and if i go carb, im definately putting a bigger cam in it

 

heres a picture of my unit now








this is the 350 i put in.

 

^^ damn, car looks clean. I had a tpi system on mine then i replaced it with a lt1 intake and now i got rid of fuel injection and went with a carb. mounted the battery in the trunk and got rid of all my wiring, my bay is looking imaculate, i still have to run a few more wires but ill snap a few shots tomorrow.

what kind of heads are those? and whats your compression? manual or auto? is gas milage a concern?
Just asking because if you are more into performance and maybe a manual car and no gas concerns a 750 dp might be a better option, thats what i did, just a thought.

 

yeah please take some pics anything to make my engine bay look better would blow my mind. do you like the fuel injection better or the carb?
-those are brodix heads 64 cc
-the part number on them is Bro-1021004 ,
gas mileage isnt a concern to a certain point. i get around 15 with 4 speed automatic with overdrive and im screaming down the interstate at about 3500 rpm at 70. i just dont want to get real crappy gas mileage and fill up everytime i drive the thing. not sure what the compression is but a 750 is most likely what i will get and just put up with the bad gas mileage until the 5 speed

 

by the way thats the nicest third generation trans am i think ive ever seen. that hood and wheels really makes a difference

 

hey man i have not forgotten about this, ive been really busy and havent had time to take pictures, but i hope i can do it this weekend. did you have any question about anything else??

 

no thats about it, but i have been busy also my dad was hurt pretty bad at work and i've been at hospitals so my cars on hold for quite a while. we've got a pretty good idea on what we've got to do to it tho so whenever you get the chance is fine

 

ok so heres a lil something. As you can see i still have alot to do but the weather is not helping, it was raining when i took the pix. I still gotta hook up the fuel lines, throttle cable and a few more wires. Def. getting rid of that air cleaner and going with something better




The engine bay is flat black so everything stands out, i ordered a blue throttle cable bracket like two weeks ago but apparently it was on backorder so i'm exchanging it for a red one tom. I also ordered the heater box without AC and i should get it tomorrow. My goal is to finish it tomorrow or at least get it started since i dont have to work or have no classes. We'll see

 

i aswell am going from a tpi to carb pretty soon, but with a 383 instead.

you will need

-carb fuel pickup(post up a wanted ad on here and ask for a carb pickup from a carbed third gen then you can just use fittings to make it go on.

-fuel pump, either old school cam driven or electric, dont go to a regulator from your stock pump, itll only cause leaks and kill you pump incase you ever wanna go back to EFI.

-vacuum advance distributor, either HEI or old point system

-intake manifold and carb

-some way to fix the torque convertor lockup to turn on, either a switch or something automatic, search tq convertor lockup switch and im sure youll find results.


let me know how it goes

 

ha thats the exact same reason i went to carb, 383 with AFRs is coming in the winter.

Im gonna have to disagree with the fuel pump, leaks can def. be avoided if done right, and it wont kill it if you have the right regulator. Holley makes a bypass regulator for hi-pressure fuel pumps which is what i'm using with my walbro 255lph. unlike most adjustable regulator this one has 1 fuel input, one output for the carb and the bypass line for the return line.

Another distributor thats nice as well if you have a ignition box like the MSD 6a or better would be a magnetic pick up distributor. <- also what i went with

 

looks awesome thats the kind of set up im lookin for. what really looks trick is these carburetor cold air kits(http://www.jegs.com/p/Spectre/769283/10002/-1). did u go with the rpm air-gap intake?

 

I may have missed this but what heads are you running and are they modified?


I promise your issues stem from the fact that you have simply thrown parts at the car with no overall plan to follow.

If you had a plan you wouldnt be questioning your intake.

Since you have invested a great deal in your current hardware and you seem to have little patience or tallent for EFI the only thing to do is to step back and take stock of what you have, what you want and decide what the best way to get there is.



A 305 TPI could have gotten you in to the mid 12's easy and relatively cheaply but if you have crippled the car with the heads ( suffering from improvement they call it ) and your determined to keep them then consider what you will need to support those heads and go from there.



As for the TPI intake, it is not "restrictive" in the sense you mean. It's just tuned for a particular power band. With proper tuning you would be in the 12's allready.

For the money you cant beat a siamesed base port matched with stock runners and a ported plenum. With even a mild cam and stock heads you can move the usefull portion of the power curve to the right by 1000 RPM +-.


You also dont need to depend on an outside chip burner to program your ECU. Look in the EFI forum and you'll see that you can buy everything you need to tune your ECU for $200 or less.

Thats less than the cost to buy the collection of tools you'll need to effectively tune a carb and non electronic disty.


Whatever you decide you really need to look at the system and not the collection of shiny parts that all "claim" to make big power.

 

alright. listen. i have a plan and my plan is to take out that dam tpi because im pretty sure i dont want more torque then horsepower. they might be tuned for a 305 and could run 12's but im not willing to send my chip off and wait forever to get it back and probably still not run right. and you can beat siamese port by takin all that junk fuel injection out and puttin a healthy carb on it that will get just as good gas mileage. im really not questioning my intake because if im going to spend 500 gettin a prom reprogrammed, i'm going to get a better intake too. ive pretty much got all the tools but this is actually the only car i have thats fuel injected and its a pain. simple enough

 

If you had a "plan" then there would be no question.

You asked a question and you got an answer.


Where are you getting $500 for a burned chip?

And I'd like to see where you could get e complete carb + manifold + distributor + fuel system for free because that's what it costs to siamese a TPI base. Py point was that you cant beat the price point for that type of mod not that there is no better option for performance.


If you are set on running a carb then why ask opinions? If you allready have a plan laid out then why the indecision?


And just by browsing through your parts list I can tell you that you WONT get MPG's as good as a TPI car and you will still fall well short of your best possible performance for the dollar.


I could advise you of several options for you that will save money and give you better performance along with decent millage but since you chose to be disrespectfull of the advice given you can go ahead and build yourself an expensive and slow car.

 

in response to ^ this guy he wasnt asking what was better for him between a carb an tpi, he was asking what was necessary to remove the tpi and convert it to carb. And you are making it sound like 350 tpi engines get a hell of a gas mileage, i did a search and on average a healthy tpi gets 13-15mpg stock, of course it depends on transmission and rear and all kinds of stuff. My mild 350 with a t56 and a well tuned prom got an average of 16mpg on highway with 3.73s

 

Think again >
And I get better than 20 MPG in my 350 TPI auto. Like I said, if he knew what he was doing... etc.

 

stop trying to convince the guy to keep tpi. look, if he goes to carb it doesnt mean he'll never go back to fuel injection. simple enough


other than the stuff mentioned. your intake and carb selection will also be very important for peak efficiency.

 

yup, thought it over, what is in bold letters is a statement, not a question, he said "my question is..."

 

tpis wants 575 for a chip. i have too much motor for TPI and i want the maximum power, and YES you get the maximum horsepower for your buck with carb. i went through and priced all of my stuff and i'm at 900 dollars for everything i need. that right there is just the mini ram intake from tpis. a buddy of mine gets 16 mpg with a 750 double pumper in a nova. some cars are better fuel injected, otheres arent. who do you think your talkin to bro i wasnt disrespectful to advice given, maybe if you would read post #1 you would understand what im asking. and yeah, when i sell my car, i'm putting my fuel injection back in it and the other motor. unless i get a prom with a good F.I intake i'll keep it but i dont see that happen. good god man

 

plus i dont really care about gas mileage in my street car. like i said before, 7 or 8 mpg would get on my nerves, but im not going to get that bad of gas mileage.