Hello all. I put on a Blitz BOV (non recirc.) on my 04 WRX yesterday (only becuase I got for a good deal). Is it normal for it to only make noise at 4000 rpm's & above? Today I noticed whats sounds like a little waste gate flutter. I can only hear it when I shift before 4000 rpm's. I have had my U.P. & D.P. on for about 2 months now have never heard this before! Could this have anything to do w/ the Blitz BOV? I'm pretty sure there is a way to adjust this BOV, but not sure how (got it used w/ about 500 miles on it). I asked the previous owner about adjustment, but he said that if I adjust it to make noise sooner it wouldn't hold the preasure at top end! Is this true? Do I need to adjust it? If so, how should I do so? BTW, I'm running stock boost. Any info would help. Thanks.

Will.

 

Come on! Does anybody want to take a stab at it? Some people told me that this flutter sound is most likely compresor surge from not releasing the air. I took the Blitz BOV and ran it w/ the stock BOV, & it didn't make the noise. What can I do to make this thing work correctly? Please help.

Will.

 

Okay, so heres the scoop! I backed the adjustment screw out, and that didn't do much. So I contacted Blitz, & they make these kits w/ 2 different springs (regular, which is good for up to 16-17 psi, & a heavier spring which is intended for applications of 18+ psi). The kit that I have came w/ the heavier spring rate spring, which is too mch since I'm still running stock boost. So with this in mind, I temparely modified the spring inside so there wouldn't be as much tension on it. This greatly improved the perfomance of the BOV. The BOV now opens alot sooner & I can barely hear the flutter sound! While under the hood, I have to put my ear to the air box in order to hear the flutter sound. So w/ this in mind, I have aready ordered the regular (lighter) spring for this BOV. With what I've learned, this should do the trick! :banana:
So if anyone has any other info to add, please feel free.

Will.