Timothy Morphy

Hi all, just wondered if my dump valve is doing it's job. Along with the dv's tish(sorry,best way to discribe it!), i get another air release from what sounds like the air filter. Does this mean my turbo will be stalling? If so how can i stop this?
The cars a 2.5 classic with hybrid fmic,using a TD05-16G at 1.1bar, and has a dv between the ic and the throttle body.

Thanks,Tim