Flutter dump

[Jccck]

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

But the BOV shuts because of no pressure to open it with.. So there's nothing left to cause Compressor Surge.. Until a millisecond later when the Turbo achieves pressure again and reopens the BoV.
Who knows?! I'd love a definant answer on this one.
But i'd have to think if there isn't enough pressure to open a BOV that is fully open at 3PSI, then there's not enough pressure to Surge.

I've got a TIAL 50mm Q Sports with 11PSI Spring, i know i can change the spring to a softer or harder one (6 8 10 11 12 are the avaliable iirc) but there doesn't appear to be any way to adjust it otherwise.
Atleast not a screw adjustment like my Wastegate has anyway.

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.

So, is 'ALL' flutter caused by compressor surge?
And if so, how to eliminate it completely?
I'm running the recommended 11PSI spring based on my Vacuum level at idle being ~20In/HG.
Now i'm worried.. Haha.