I've been doing some researching on secondary butterflies and i've come to find out that what causes them to open is the engine creating enough vacuum and WOT which pushes on a diaphram which opens the secondaries.

Now, here is my question/theory.

If you are running boost and (for arguments sake) a GE vacuum manifold, would it be possible to run one nipple from the VM to the diaphram? Then, if you are running say 15psi, put a boost solenoid (i think that's what you'd use) inline between the vacuum manifold and the IAB diaphram that would open it at a specified psi? In turn, wouldn't that give you more air above that set psi?

Thanks in advance for any help clarifying this.

 

I thought vacum was what held them closed, and then they opened, because I have a GSR manifold, but the butterflies are always open.

 

tie-wrap them open
and they will always stay open

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lobudgetr &raquo;</TD></TR><TR><TD CLASS="quote">I thought vacum was what held them closed, and then they opened, because I have a GSR manifold, but the butterflies are always open.</TD></TR></TABLE>Vacuum pulls them closed, but it's not passive like that. There's a vacuum reservoir bottle under the manifold, and the ECU controls the IAB solenoid valve to open & close the secondaries.

 

The point of the butterflies isn't just to flow more air. Changing whethere they are open or not changes the effective path length of the incoming air. In the intake manifold, there are standing pressure waves, dependent on the air velocity and the engine RPM. By changing the path length, they take advantage of the waves by placing the peaks and nodes so that there is a higher pressure spot at the port, forcing more air into the engine. So, opening your butterflies all the time will flow MORE air, but the manifold is tuned in such a way that it isn't necessarily supposed to flow that much at lower RPM.