Quote Originally Posted by mugen_ctr View Post
BOV use Vacuum pressure to open em, not boost pressure



All bov like HKS, Tial, Greddy etc etc are adjustable... Just play around with the adjusting spring...

And agree about bov spring.. BUT on HKS SSQ they use a combination of spring and diaphragm which makes em one of best bov on market. Almost leak proof

BOV flutter is compressor surge! LOL... think about it, when its shut theres no were for the air to go, so it goes out back the turbo, creating that fluttering sound
Compressor flutter sounds is bad for your turbo, causes the pressure to go back to the compressor which will cause the comp wheel to spin awkwardly. Lol

S15 t28 turbos are common for this. Their either block off the bov or keep em tight closed. And they get that nice sounds of flutter almost like a screamer pipe.

But at the end, the longevity of the turbo will fail and you will get a loose comp wheel or worse fall off to your exhaust.

Not recommended.