the type of engine dosent affect the BOV/DV,
the only things that affect it is the amount of boost you are running and the inertia of the turbo, with a big turbo like a T4 or something bigger running on a jap sled, the turbo takes longer to slow down when you close the throttle

(hence why rally cars "chatter" for longer)

dump valves just "dump" any pressure between the turbo and the throttle body outside the inlet to stop it running back through the turbo slowing it down.

if you had a turbo that spooled instantly and stopped instantly the moment you closed the throttle, you wouldn't need a BOV/DV