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Curiosity more than anything else but I'm in the middle of replacing my bypass valve solenoid with an aftermarket MAC valve. I'm clear on where the ports connect, just not sure why.
When the SV is energized it opens a vacuum path from the intake manifold to the top of the bypass valve, this vacuum plus the boost pressure overcomes the resistance of the diaphragm and spring in the bypass valve allowing boost to divert back to the intake ahead of the throttle body.
In the non-energized condition the valve I'd directing vacuum from the intake manifold to a port in top of the intercooler. What is this port, what is it doing, does it serve any function? Is it allowing charge air to backflow into the intake manifold? Why would they do that, it's not enough flow to really do anything. Why not just use a normally closed two port valve? Did they do it to avoid the possibility of vacuum leaks? Surely it serves some purpose by connecting to the intercooler
 

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weekend racer
2014 VT manual
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8,082 Posts
I think it is just a reference port really. like a check and balance.
 
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