Originally Posted by
onebadcoupe
just to clear things up. if anyone knows anything about fluid dynamics. alot of factors come into play when choosing a throttle body size. your intake manifold, port work done,valve job,cams,compression. you want to have a certain level of velocity for your motor to be its most efficent. large throttle body,large intake manifold decreases air speed. disrupts air distribution,turbulence and ultimately atomization. just do some research and make sure all your components work with eachother rather than against eachother.
agreed. lol i was just about to say the same thing. the size of your plenum is a huge determining factor as to what tb size to go with. you can't just say one size is good and one size is bad. if i remember correctly if you have a bigger plenum you use a smaller tb and smaller plenum can use bigger tb...i'll go verify that and get back to you. although manifold sizing isn't the only factor, it is a very important one. i will say tho, i have the pro2's with a 66mm tb and s2 manifold and i wish i went bigger. that's why itbs are next on the list...
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Last edited by MightyMaxGS-T; Sep 26, 2009 at 12:59 PM.