When does the 1G BOV start to leak?

[LightningGSX]

Why don't you just do a test and see? Rig up one of them boost leak testers, but put a vacuum nipple on it too, plug the BOV vacuum line into that nipple(which will simulate normal boost operation).Slowly pressurise it, watch the boost gauge, and see when it cracks open(probably by a noticable drop it PSI)