Shirl

Curious to see how it's done. Thanks!

Just found this:
http://www.ehow.com/how_4553230_port...ttle-body.html

dougbfresh

Waste of time

Shirl

Didn't ask if it was a waste of time.. asked if anyone has done it.

dougbfresh

Many have and messed it up-do a SEARCH on it, you'll see. A professional porting costs little and does not really do much of anything. Just buy a bigget TB if you think you need one (unlikely).

Shirl

Interesting... I did a SEARCH before I posted this and found some dyno numbers that showed anywhere from 5-12 hp gains:

http://www.s2performance.net/vettepage.html

dougbfresh

Go for it then-search on THIS SITE and you'll get much different info.

Shirl

That was a search from this site. Do you have any significant info on this topic?

dougbfresh

http://forums.corvetteforum.com/c5-t...fications.html

There is almost no change in cfm after the porting, and he removed the throttle blades.

Shirl

There was an improvement though. That's what I'm looking for. Add a high flow intake (Vararam) and there will be more improvement. Thanks for posting that.

C5kid

What you wanna do is take the TB off and look down in there. You'll take notice that the area leading up to the blade goes up fairly steep and then flattens out near the blade.

What you wanna do is hog out as much material leading up to the blade, BUT!!! don't take any material out in the area around the blade.

I like to take a marker and make a line where the blade is at rest, then push the blade front till it hits the stop and the blade is perpendiclar in the TB then mark that line. You do not wanna take any material in between those lines.

An air dremel, a Alumn-a-cut dremel end, 80 grit sanding rolls, 120 grit & 200 grit.

Start w/ the alumn-a-cut. BE CAREFUL!! that thing takes out material like a hot knife. Hit the high points and slowly start blending towards the opening. Once you have everything where you would like put the 80 grit sanding wheel on.

Once you start sanding w/ the 80 grit your goin to take notice where the alum bit left high spots and what not. start smoothing them out w/ the 80 grit wheel. try and get it as smooth as possible w/ the 80, this will help speed up the process w/ the 120 & 200.

After your happy w/ that, throw on the 120 & 200, this is where the polishing comes in. go slow, it's time consuming.

After you do the front opening, you can do the same to the rear. There really isnt too much material that can be removed out the rear.

Bill Curlee

100% correct!

I ported my 02 ZO6 TB. Seems like it made a difference to my ASSOMETER.

Theres a hollow void directly below the bottom portion of the opening floor. When your removing material, be careful NOT to go crazy. If you go too much in that area, it will break into that void. I did that and just used a little JB Weld and filled it in, let it harden and kept smoothing. It will NOT hurt anything but its something to keep in mind.

Some people do a lot of work in the square recess area where the vent opening is. They extend the vent tube with brass tubing and fill that area with JB Weld so that it blends in smooth with the rest of the TB opening.

I ported my 06 and 02 ZO6 FAST 90 LS2 throttle body. Now,,,THAT was FUN! You can really hog that thing out!!

I work my way up form 380 grit, 400, 600, 1000 and then semichrome polish. The opening looks like a MIRROR! I have fun when I port! I feel ARTISTIC,, or is that spelled AUTISTIC

Bill

printmanjackson

has this been proven one way or the other on a dyno?

02gixxersix

I have. I used to port them and sell them on another LS1 forum. It's time consuming but not very hard. You can definitely mess it up if you port past where the blade seats though.

~Josh

Here's one perfectly ported along with the halfshaft mod.

I gave a picture tutorial about the halfshaft mod which really helps with part throttle airflow, but I can't find it.... it was a post in someone elses thread, and I don't feel like searching.

0331MARINE

Power is power. Even if its just 2hp-5hp!!

Bill Curlee

Now,,,,, THATS a properly ported C5 TB!!! WELL DONE!

Heres a C6 LS2 ported TB for compareson.

Shirl

Nice work and great tutorials guys!! Thanks for posting! When I get my car straightened out, maybe I'll try this!

Zehner189

Seems like a hell of a lotta work for such little gains. Doubt it's worth it. I'd rather just get bigger TB.

coolou

Possibly I am off the track here but since you are talking about power has anyone found a real difference between the stock air filter induction system and the performance air filter induction systems of K&N and Black wing.
I have just installed a performance Black wing air induction system on my '03 vert and wonder what difference in performance I might get.
A short run seem to tell me that there is a better throttle response
and it should improve my gas mileage.
But I would like to hear from others.

coolou