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I know why they are supose to be there, but I'm interested in how they actually work. From what I gathered there is a spring pushing a valve shut very similar to a wastegate. Then there is a vaccume line too the spring compartment so when there is vaccume it pulls harder than the spring and opens the valve.
This would seem to me that you have to get a spring that is set for around 20inHg otherwise the valve would open when you are cruising down the highway.
The reason that I started thinking about this is because I need to purchase a BOV, but I've got an extra wastegate lying around. I probably won't use it but I'm wondering if its possible.
20 inch of mercury [0 °C] = 9.823083 pound-force/square inch (PSI)
Air filter?.......It's just releaving boosted air pressure from the supercharger as it's not needed when the manifold is in vaccume. it is open when cruising releaving boosted air pressure because it's not needed, also it's to releave high rpm boost pressure when the tb is shut between shifts...sounds cool........for turbo I guess you might need two ...one for bypass and one for regulating the boost psi? now I'm wondering how a turbo surge valve works. you are going turbo, right?