Imprezer

iTrader: (9)

What is the theory behind a high performance intake manifold and throttle bodies?

I have an idea of custom making an aluminum intake manifold with 2 or even possibly 4 individual throttle bodies ala JUN.

Whats involved in designing an intake manifold? Of course, the runners must me equal lenght, that I know. What about the plenum?

What is the advantage of running individual throttle bodies?



This is the JUN super WRX.

Whats so good about this setup? It has 2 throttle bodies. What if they were to use 4 throttle bodies for each cylinder?

Lets talk, gentlemen,

- Alex

bamfwrx

I think that they used the 2 small intakes b/c they could get such short intercooler piping.
I don't even see the throttle bodies in the pic

Shorter intake runners the better for high rpm right

Imprezer

iTrader: (9)

Why would I be running lean?

stealth-wrx

the concept of individual tb's is to be equal. most of the problems we run into is because nothing on our cars is equal. here is a few examples of our problems. look at our exhaust ports in our heads. in each cylinder one runner is much shorter than the other due to space. the ideal situation is equal for everything is to be equal. our exhaust manifold is different lengths, our intake manifold is different lengths. if we were to make the exhaust equal lenght, the intake manifold have individual throttle bodies, and the heads all equall, we would surely bring out monster power in the subaru. the reason why equal is so important is because one cylinder may get air faster or get more air, or your cylinder splits out exhaust but since the chambers are unequal the flow is impeded. you guys get the idea. equal means that everything is shared equal and no one cylinder gets pounded while the others are on easy street.