TPI THROTTLE BODY HELP! No, It's Not Ot!

I'm trying to convert this TPI throttle body to use on my Cadillac flathead. I'm only using it for air induction. I'm not sure what all these ports are for. I want to get rid of everything that I don't need.

Can someone help me out? They are lettered A-E.

 

I seriously doubt you need any of them if you aren't running EFI. They are for some smog control hoopajoop or another. Maybe 2 are for the IAC. What would you hook them to if you kept them? I'm pretty sure the Cad won't have the hookup of the other end of that hose.

 

That's what I'm trying to figure out. If I need some of those. then I'll need to make provisions To hook them up. If I dont need them, I can cut and fill!

 

I'm not sure which TBI unit that is, but some of them have a water jacket intended to prevent icing of the throttle. You may or may not want to hook that up, depending on your climate.

 

Plug them all except "E" and use that for your PCV if needed ....................

 

what was its original application?

 

Looks like '85 '91 Camaro/Corvette but I would say 305 Camaro TPI.............

 

Really you are going to need them all in some respect. The TPS ( throttle position sensor) will be needed as well as the IAC ( Idle Air Control).
Now there are some options here:
The TPS could be mounted anywhere you wish as long as it shows throttle movement. Om a hot rod a good place would be inside the car under the dash etc.
Same with the IAC , its a controlled ( ecm) air leak and may be mounted in the glove box, under the dash etc as long as you have a hose going directly to the intake for idle control. Then just use the throttle valves for air control somewhere in the intake air flow ..........They make a adapter for the TPI ( thats what ya have there) to fit thisd to a four barrell manifold.
The vac ports and water ports are up to you , may not need any of them????

 

Bubba I don't see the adapter you are talking about and was only responding to his question of ABC & E . The sensors, as you said, will depend on what the heck he is doing!..........

 

It's '85 '91 Camaro.

The throttle control and IAC sensor will stay in there current location. What port/ports are for the IAC, and what do I hook them up to?

Gmc Bubba, did you get my email re: 58 tri-power dizzy?

 

The IAC(the 4 hole square looking one) and TPS are the 2 plug connections in the 2nd pic. E looks like the pcv, B & C are for water crossover (so the throttle blades don't frost in the cold).

 

B and C are both coolant p***ages to warm the trottle body, A, D, and E are all vacuum ports. you are going to use the IAC and TPS.

I have never heard of an adapter for a tpi throttle body to a four barrel intake. An adapter for a tBi to a four barrel intake is very common, GM even made them

 

Yes but refresh my memory on exactly what you needed. Chevrolet electronic mallory ??? Small cap........right ...

I ran the caddy/packard unit on the machine today , going to work like a champ . I will write a tech post here on your build tomorrow.
Pretty wild.

 

Well ya have now , we use this adapter and have for many years to install injection on a reg intake manifold. Made and sold by Mr Gasket and Accel. Pretty nice piece to adapt the tuned port throttle plates etc to....l

 

OK so now you have an adapter to adapt the throttle body, where or how are you connecting the fuel rails and inj.? Got a pick of one set up?

 

So do I need any of the ports fot IAC, and if so, do the just go to the intake manifold? If so, which ports?

I'm put on on an Edelbrock tri-power on the SBC. All of the aftermarket HEI's say not for use with a tri-power. Is there a off the shelf HEI I can use? Or, what should I use or have you convert?

 

I dont have any pics on this computer .
***uming you have a engine with four barrel manifold you use this air horn adapter with the tuned port throttle plate etc.
They also sell blank fuel rail and bungs to place the injectors where ever you wish. Some aftermarket manifolds have these bungs cast in the unit for the injectors . We ( www.lindertech.com) also thread injectors 5/8- 32 to thread into the manifold as well. Theres really no limit to what you can do with these stock parts laying around. BDS makes a an6 line fitting for the top of the injectors thats pretty cool .
We just finished a dual carb dodge with the injectors hidden inside the manifold with an lines and the old carbs are used for air flow only.
Stay tuned and watch this injected caddy come to life .
I will write some tech tomorrow on the ignition required to make this all work, just finished it today.........

 

Instead of using the one Gmc Bubba shows, I;m making an aluminum one to fit the blower.

Here are the pics. Check out my build thread, there are more pics are there,

Which of the Vacuums is required for the IAC?

 

Thanks Bubba for the info, I like to keep abreast of things going on in other shops. Last question, what is gained by using the 4 barrel manifold and adapting the TPI throttle body, drilling, bunging, etc? Why not just bolt on a Camaro/Corvette TPI unit as is? I can understand the custom stuff, hiding this and that, dual 4z, etc. The stock TPI units are cheap, proven & plentiful......................
Never mind I get it now, not everyone is TPI ing an SBC du.........

 

That would be easier than making an adapter, and linkage to the throttle would be easier. What do they cost?

What do you use for an air breather?

It would be easier than making an adapter to the blower!

So, again, do I need any of the ports fot IAC, and if so, do the just go to the intake manifold? If so, which ports?

 

What do you use for an air breather?
Street & Performance has K&N filters of varying shapes..........

 

I'll have to look into that. I may try and use a birdcatcher style, and try and cover the throttle body, by mounting the birdcatcher low over it.

My big question now is, does the IAC need any of these vacuum ports to be hooked up? Which one/ones?

I'll be using a reprogrammed '92 on up Camero computer, with a map sensor.

 

Typically the gain is the use on a non chevrolet engine etc. Like cliffords six cylinder manifold has the injector bung located on each port for the six,s. Early chrysler engines etc, non chevy stuff.

 

The IAC is electric and will be hooked up to your computer, who's harness you gonna run?
This stuff fascinates me for some reason, especially running a blower!

 

check out www.chevythunder.com
you should find all you need to know about tpi right there...​

 

I know it's electric, but doesn't it utilize one of the vacuum ports?

I'm using a harness by Larry's Electric. Gmc Bubba recommended him

 

I know it's electric, but doesn't it utilize one of the vacuum ports?
In your pic the IAC is already screwed into where it goes, just add harness!
Got any info on Larry's Electric? Does he do custom looms?........... Got a web sight?
Thanks

 

Gunny. that is a great site! It tells how the IAC work, and references vacuum. But neither in the description, or vacuum diagram, does it show what ports I need.

Surely, someone can answer this?

 

It srews into the va***e port that you already have it in, make sure you take it out and clean the cone shape end and spring................

 

Maybe I need to rephrase the question. I realize the IAC is in place, and I know it's electrical. I'm trying to get rid of all the vacuum ports, water ports, etc. I don't need. I'm trying to figure out which ones, exactly, that I will need to leave and not cut off and weld up.

Yes, Larry does custom looms. Real nice guy to talk to.

Larrys Electric ........... 618-282-2852