The amount of air brought through any size T/B is based on the demand of the engine(vacuum on intake stroke). There is no EXTRA air other than what is needed. The T/B doesn't shove air into the intake its pulled through it. Maybe I'm misunderstanding what you mean by catching up.

 

Well it will for sure need air i am trying the skunk2 PRO 2 cams they are hugh with long duration

 

Basically what he is saying is that intake manifolds are tuned to provide significant gains in certain areas while sacrificing loses in other areas. The restrict flow to provide gains to a specific area. Just as an intake pipe can be tuned for diameter and length to provide gains in specific areas. If you go too big on these items you push your "power band" too high for the motor to reach therefor actually losing power. The TB also plays the same role...it is a balance that you must have in order to actually gain power from these bolt ons.

If bigger was always better, why doesn't everyone have a 78mm TB with an air filter directly on the TB and a Victor X manifold?

 

^ no room..i was thinking of just useing a parking cone so i can have a 100" throttle body

 

Not a bad idea man...I'll have to look into that!

And it's tapered too...from like 400mm on one end down to about 40mm...talk about ram air.

 

I agree the intake manifold design will change your power curve. Runner length ,cross section , and taper as well as plentim size and shape. Ive personally not seen power changes with due to T/b being to big. The inlet size will not change the power curve. The victor X has very short runners and a large plentum. That is not Ideal for stockish setups.

 

Intake length and diameter will affect power curve so that would lead me to believe that the TB would also impact power curve. I know the intake manifold is the most important part of the intake system but everything works in conjunction with each other so I am certain that the larger TB will effect the power curve...how much so nobody can really say without back to back dyno tests with more than one car type.

 

One thing to keep in mind. T/B size on a street car/ OEM application has more than just performance in mind by design. The bigger the T/B plate is the more air that is induced under partial throttle. The larger the plate the less control the driver has over throttle control and light throttle emissions. Anyone who has run a big bore T/B knows what I'm talking about. You give it a little gas and the car almost lunges until you get a feel for it. In the case of the ITR they felt a step up in T/B size was necessary not to hinder performance but keep the plate as small as possible.

 

i seen nice power on my 70 mm with my skunk2 mani on my all motor h22 setup. it just depends on what else is done.

 

rang you ordered the exact throttle body i have. ill tell you right now my only complaint is that it sticks a little. i had to play with the spring to get it to turn past the sticking point. i even swapped springs and cable brackets from my old throttle body onto it. once it gets worn in it doesnt do it so much. you might feel a small snag in the pedal once in a while but you need to wear it in and play with the spring. other than that i love the thing. it was a nice additive to my setup.