I'm not the ignorant one, they said don't use the red spring AFTER they said you can change the springs for adjusting modifications. Why do you insist on using it?
i like the forge BPV, simple design not much can go wrong. And i am using the blue spring. I have tried the yellow and yellow with shim. The best way to tell how the boost is holding is with a boost gauge (wich i have) Thats why im using the blue spring. No flutter on high accelaration lift off. Holds boost better. Low flutter lift off is not a sign of compressor surge so no worries.
Seems like there is some disagreements on what spring to use. I say get a boost gauge and see for yourself.
You want a strong enough spring that will not open under accelleration or you are loosing boost(power) And at the same time you want the spring to open enough when releasing the gas pedal to prevent surge.
