I have a couple questions... First off i would be extremely grateful if other members on here who have already down this mod could show me pics of their shaved TBI unit. Also if the throttle shaft has the throttle plates/blades bolted or screwed to them then wouldn't the blades fall off if the head of the screw was ground off to make for more airflow? I would really like to see pictures b/c this will be my first mod to my TBI unit and i don't want to screw it up. Thanks

 

do a quick search i am sure i ran accross a post the other day with pictures

 

Here are some pics of mine. I had it bored to 48mm so I could run TPI blades. This will either fall on it's face and be way to much air for the engine or it might work out.
As far as making the factory fuel pressure regulator adjustable, I did that on the unit that is on the car and was not able to get much more than a few extra pounds of pressure to the injectors. It might be the pump that is limiting fuel to the 13pound range.
I also made an injector pod spacer to get some more airflow and also keep the fuel spray the same in the throttle bore. I think that combined with just removing some material around the bores will do the most good. The blades are aluminum and the shaft steel, so I don't know of anyway besides bolts to keep the blades in there.

 

That's pretty radical TZFbird - very nice!

Here's mine. It's more along the lines of what's described in the tech articles.

Although, shaving the throttle shafts is probably the only thing that's really going to increase the CFM of the unit, I'm not sure if it's enough to make it worth doing it. I was very nervous about doing that mod as well.

It would be great to see some actual flow bench numbers comparing a stock TBI to one modified at each of the various stages. Then we would know what each of these mods are worth.

 

Very nice guys! and i agree with the flow tests. They should be done.

 

Here's another pic of the shaved throttle shafts. You can see where a cutter nicked the throttle plates. At the time, I had paid another TGO member (who I won't name publicly) to do the machine work for the ultimate TBI mods. But, the results were disappointing at best - in reality it was more of a hack job. So I ended up finishing the TBI off myself.

Had I realized how easy it is to do, I would have done the whole thing myself. For the throttle shafts, I used a flat and small round file to clean them up. You can get better results (w/o the nicked throttle plates) by simply using good sharp hand files.