TOPIC: TBI Testing and Information

First before I get started I would like to share a few picture of my work on tbi trucks. Once I figure out how to post more than one picture at a time to attachments.
If any one get a call on tbi If you could let me know I have three fourms going and a couple of people may be interested I would like to track that also! I may have more information for you. If anyone want to see more picture just let me know.







Craig

Hi Craig,

Not sure what the first two photo's are but I definitely recognize the engine.

You can actually insert the photo's into the post after you select them. Just make sure you have your cursor where you want it in your post before you click on "insert" for each photo.

Karl Fortner
Tacoma, Wa.
Gadgetman Tacoma

Karl,
The first two pic's are a 454 tbi that was moded. First pick is the gm injector pod If you look all the casting was shaved down and matched second pic is the lower throttle body plate moded. Best way to think about this is I ported the tbi for better air flow!

Craig

Here is my testing tbi on the right, As you can see its no modded unit just a stock unit with the groove. I have set up my own personal tbi to compare the two. I will be taking it apart for cleaning before installation. What you can't see is the groove depth and shape.

Okay, now I've got the whole picture.

A friend of mine has one of these on his truck, he's thinking about having it done in the spring.

Guess I'd better be taking notes.

Karl Fortner
Tacoma, Wa.
Gadgetman Tacoma

Here is where I work on my tbi projects.

I'm Jealous, my garage is full of everything else.

Karl Fortner
Tacoma, Wa.
Gadgetman Tacoma

Hi Craig,
I have a bit of experience Grooving on these TBI units. My Suburban didn't get increases until I changed the idle air pathway. Check out the Service Bulletin section for information on rerouting and reduction of this units idle air control. Nick

Nick,
I have read most of the service bulletins. So I do have a lot of question about the changes that have been made. So I will ask about them as I go through testing. Do you find this Idle air pathway need to be done on all tbi or would a new computer chip tune make more sence??

Craig

Craig, if one is going to Groove a TBI unit my experience says you should alter the idle air pathway, especially if the air is dumping near the Groove. The modification reduces the amount of air and moves farther away from the Groove. Adjusting the throttle plate idle screw forces the maximum amount of air over the Groove.

Nick,
I will make that change part of the installation!

Thanks

I use soap and hot water to clean the tbi. Chemical can damage the seals(red pointer) on the throttle shaft. If you buy a rebuild kit the seal are not in the kit you have to make them your self or you have to do the bushing mod.