Can some people post pictures of ultimate TBI mods they did to the throttle body? I am doing the ultimate TBI mods and I want to make sure I am doing it right. Thanks.

 

Here ya go. This pick was after I cut the ridge off and made the radius. After I shot this pic I snaded it really good with some fine grit to take away any imperfections. It is now mirror smooth.

 

What grit sand paper did you use to sand it down? And also, how does your car run after you did the mod? Any noticable differences?
Corey

 

I think I used some 400 grit and then 2000 grit. I only went so far with the sanding because I was bored and had all day out in the sun to mess around. So because of that I made mine look like it came out of the casting like that. The car was pretty stock when I did the mod so I didn't really gain anything. It is one of those mods that will help get you the last few CFM out of your stock TBI unit when you have a full ehxaust and add a cam. Beyond that and you need a larger TBI unit. It is a good mod to do so that you learn about your TBI unit and give it a really good cleaning.

 

Did you grind the throttle shafts down at all? It sounds a little sketchy to me to be working so close to the throttle plates. Also, couldn't you just use two or three injector pod gaskets to raise the injectors instead of buying a spacer (if the stock bolts are long enough)?

 

I did not grind on them for that reason. I didn't think that little bit would effect flow that much and I did not want to slip off and knick the sides of the TBI unit. I had a hard enough time keeping my dremel still when I did the top ridge.

 

Yeah, I just got done assembling the TBI unit. I also had a problem keeping the dremel still will I cut the ridge. I left the throttle shaft alone. On another note, I figured out a way to adjust the fuel pressure (after doing the AFPR mod). Just find an allen wrench and grind it down on the long side into a flathead screwdriver. When you want to adjust the fuel pressure, just put the allen wrench up through the hole and adjust the screw. You don't have to take anything off that way.

 

Sounds like a good idea to me. I wish they had a allen wrench with a torx head on it. My GM vacuum one has a torx screw in it and I have to take it off to adjust it. I geuss I could try to replace the screw....

 

Where was this top ridge at. ANy pics before hand that you could point out. I am planning on doing this mod. Im stumped on what this ridge is. Of course Ive never taken my TBI unit off either so.

 

My allen wrench plan isn't great. It's still pretty hard to adjust it with everything assembled but it's better than nothing, I guess. About the ridges, it's the raised portions that follow the bore of the throttle bores but aren't connected. If you take your TBI unit off and look straight at it, the ridges are the raised parts that come off of the bores. I hope this helps, I'm not very good at explaining things like that.

 

This isn't the best pic but it is the raised ridge of material that follows the edge of the TBI bores. Just compair the two pics and I think you will see. It looks like a mini great wall of china.

 

thanx guys that helped alot.

 

A word of advice, wear eye and mouth protection. Buy a mask for your mouth and nose. My throat feels all scratchy now. I used a mask but I forgot until I was halfway through. I'm paying for it now.

 

I suggest you all visit

www.cfm-tech.com

I do alot of modifications to my boat... I talk to the guy that runs this company all the time, I just picked up all the parts from the article, and WOW, what a difference. This guy knows his stuff, give him a call. It's worth the moolah.

 

since people are being linked to this thread in the Ultimate TBI section of "New to TBI?" thread, here is my modded throttle body. I also didn't touch the throttle shafts, the risk seems to out weigh any gains, imo.

Here is my modded throttle body:

 

Excellent job led zep. Very smooth and clean. Looks like it was originally made that way.

 

Thanks green92! I put a lot of time and effort into it, but now I feel like I could do it in half the time at an even higher quality after doing the first one.

If shipping wasn't so high (for both ways), I'd offer to perform the mod for people who were afraid or lacked the tools to do it themselves for a fee.