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If a wastegate spring is set to open at 6psi, does this mean..it starts creeping open at 6 psi? or Is 6 psi when the flap fully opens?

It says "For example, even though the wastegate's spring is set at 6psi, with a boost controller set to 10psi, the boost controller will bleed out 4 psi and send a 6psi signal back to the wastegate. If it goes higher, the wastegate opens, and boost levels out." Where it says "If IT goes...