I can't seem to get a straight answer on this one.

My current setup is using a hks ssqv and at low boost (<3000k revs) I get flutter dump. You can hear a bit of 'su tu tu' then 'psht'. It even happens in low vacuum.

However, when I go beyond 3psi of boost the bov dumps fully.

Is it normal for a ssqv to be doing this? my impression is that they're meant to open fully no matter what boost level.

I don't mind the sound just worried it may be detrimental to my turbo down the line...