By Pass Valve

[Macbuick]

Hello,
Can someone tell me how a ProFlow by pass valve from Procharger works?
Must I tune something on it?
When the carb s butterflies are closed, boost escape from the Valve, ok, but how do I know that when at WOT boost isn't also escaping ?
Thanks
David

[vinces427bb]

soon as the vacuum drops to "0" when the carb butterflys open @WOT;
(vacuum holds it open against a spring load=when the vacuum drops to nothing the spring closes the valve...)
the bypass valve closes and pressurizes the intake/carb hat and starts forcing air into the engine;
as boost pressure rises the so does the fuel pressure via the pressure compensating regulator...
i have heard of people doing adjustments/tweaks to change the closing/opening points of the bypass.
i don't have any input on that though...