Has anyone tried boring out their throttle body? If so, how much did it cost you to have done? (I neither have the tools or the know how to attempt something like this) Also what sort of improvements did you notice both performance wise (i.e. throttle response, torque, increased power, fuel economy)? Thanks in advance!

 

Here ya go..Best deal I have found to date. I plan on getting one once I have a few other things done first. Yes you will notice a difference.
http://www.strokedjeep.com/tbody.html

 

throttle response went through the roof.

 

yep, noticed a pretty good difference bored to 63mm from that leigh guy. havent noticed any mpg improvement yet because of many other issues. i also got his spacer, but probably wouldnt spend my money on it next time after thinking about it. he does excellent work though

 

Is this something that could be done at a machine shop on the existing throttle body? If so does anyone have a rough estimate of how much it would cost?

 

call some local machine shops and ask.

 

i posted on a link to some ones write up about doing it your self on a other thread about bored TB. but u can only go up to 60mm with out modifying the butterfly valve.

 

I did mine myself last month. Bought a 2 inch round rubber sander attachment for my cheapo drillpress and a bag of assorted sandpaper drums. Took me about 1 hour to remove the TB, remove all the doo-dads and carefully bore it out.

 

doesnt the manifold opening have to be bored out also or can you just keep it stock for the 63mm TB?

 

i left mine stock. boring it that open you lose a lot more air speed

 

Now I'm not sure if theres a lip on the intake after you've done this but I would imagine there would be. It would be very beneficial to you to taper the intake to fit the bore of the TB. Almost like a air horn.....sorta speak. Otherwise the air is hitting that lip and bouncing all over the place which is horrible.

 

i dont remeber there being to much if any lip when i installed mine.

 

do u get any of the whistling form your tb now?

 

Yup. I think its amusing. I could take it off and round off the sharp edges on the IAC. I tell people it's my wastegate from the turbo..

 

I threw in a airaid helix throttle body spacer, wich has spiral groves in it and is supposed to "spin" the air making it move better. I can hear a whistle after i put it on, the package says im supposed to but I can barely notice a difference in response or anything does anyone know much about that?