throttle Bodies

[03REDFIRE]

Hers a question im sure thats been asked before but here goes.

When changeing TB why would you choose either 70mm or 75mm
I know we are talking about size but Im currently N/A and someday going SC
Current mods 2003 GT, Long tubes, high flow cats, Magna packs and Mac cold air .

Im leaning toward Accufabs TB and Plenum or Accufabs TB and Trickflows Plenum could someone spell it out why i would choose 70mm and not 75mm?

 

[forpit2000gt]

http://www.modulardepot.com/?show=articlesdet&aid=38
Take a look here and decide for yourself.

 

[tomustang]

http://www.partshopper.com/shop/MAC-Mustang-Throttle-Bodies-m173.html

I was happy at the results. It's cheap and good on the sotp meter.

 

[Gearbanger 101]

If you're going to be supercharged in the future, you might as well go with the 75mm now. Yeah, you might lose a tiny bit over the 70mm now, but it'll give you a lot later when you're forcing air through it and it will save you from having to upgrade twice.

 

[DropTopPony]

If you're going to be supercharged in the future, you might as well go with the 75mm now. Yeah, you might lose a tiny bit over the 70mm now, but it'll give you a lot later when you're forcing air through it and it will save you from having to upgrade twice.

i agree with gearbanger, once you start modding you can't stop! Next you will want ported and polished heads or a supercharger etc. So you might as well get the 75mm TB now and not have to worry about swapping it out later.You may lose 1 or 2 hp now on a stock set up but you will gain that back and a few more down the road.

 

[tony laq]

thats a good question...and i dont have an answer but are you getting a plen also?...for some reason i seem to read alot of info where people say a bigger TB isnt going to do much without a new plen also...if thats 5.0 or 4.6 specific i dont know.

tony

 

[forpit2000gt]

thats a good question...and i dont have an answer but are you getting a plen also?...for some reason i seem to read alot of info where people say a bigger TB isnt going to do much without a new plen also...if thats 5.0 or 4.6 specific i dont know.

tony

for basic bolt ons on a 4.6 the 75mm may not perform quite as well as 70mm, but pays off bigger as you upgrade engine parts or forced induction. the 5.0 engines repond a lot better and differently to larger Tbs with the same type of boltons, but they were so restricted to begin with.