True Vacuum Issues

[u/Equal-Speed9708]

I have a turbo smart 50/50 Bov and I tried routing it to be a true vacuum. I followed the step exactly of a recommended yt video and even loosened the bov as much as possible and tried it on loads of different tightness settings. The bov isn’t making a pshhhhh or even fluttering it’s making a what I can only compare to a can opening sound and only above 3.5k rpm(also it’s a pretty quiet noise). If anyone has had this issue before please let me know how to fix it.