Reader of many threads
Most simple BOVs and wastegates just simply react to intake pressure - if it's higher than it's supposed to be, it'll open up and let excess air out. This happens mostly when you've got the turbo spun up nice and good and then lift the throttle to shift..... throttle body snaps shut, turbo is still spinning air into the intake system, pressure builds up real quick in the intake and intercooler, wastegate spring force is overcome and it opens up to dump that extra pressure.Thanks for the info. Having never owned a turbo vehicle, should the wastegate only open when I'm under boost and step on the clutch?
That said, some big turbo builds have the wastegates open even during wide open throttle. The turbo can supply more boosted air pressure than the engine can safely handle at lower RPM. The wastegate usually closes in the top end to force feed tons of air at high speed, just to snap open again for a gear change.
At the end of the day, in either case, the power delivery should be SMOOTH. If you have a wastegate that's acting up, it'll feel off and inconsistent... maybe the spring is toast - or if it's electronic, the pressure sensor acting up or the servo in it is wonky, etc. It'll manifest as surging/inconsistent power delivery.