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This is a discussion on "The BIG BOV thread" (Where all bov question threads get merged) within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I think HKS is pretty darn good. I'm very satisfied with it....

  1. #541
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    HKS

    I think HKS is pretty darn good.
    I'm very satisfied with it.

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  3. #542
    Registered User kaizenfighter's Avatar
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    If you plan on running high boost, the hks is definately the best. It is designed to hold much higher levels of boost. Any of them will do if you are just in it for the sound though. The hks does have a higher pitched sound than the rest.
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  4. #543
    Registered User KanosWRX's Avatar
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    APS-COBB Blow Off Valve Question

    I was just wondering if people who have this could tell me how much louder this is over the stock BOV. Or if you can make a sound file that would be even better.

    Thanks
    Bryan


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  5. #544
    Registered User PlatinumWRX's Avatar
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    It is fully adjustable. It can sound EXACTLY like the stock BOV, or like a mild, solid, WHOOSH with each shift. All with a pair of wrenchs.

    -Jim

  6. #545
    Registered User KanosWRX's Avatar
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    But it is still 50/50 right, or when you change the sound will it go to 60/40 or 70/30?


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  7. #546
    Registered User PlatinumWRX's Avatar
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    Originally posted by KanosWRX
    But it is still 50/50 right, or when you change the sound will it go to 60/40 or 70/30?
    You change where the air is going, but it still recircs initially (it's inherent in the design), but yeah, adjusting it will change the recirc ratio. I think I just invented a new term.

    -Jim

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    Is the OEM BOV good enough?

    OK..I have 2002 wagon...so I bought an aftermarket BOV (100% atmosphere)and it makes the cool sound..la-dee da. Now I read these posts about recirculating BOV's and I am now thinking I never should have replaced the OEM BOV. The drawback to the OEM is that it leaks at high boost ? I am running 15psi right now because of a MBC. So what should I do..trash the aftermarket and put the old one back? WIll the OEM hold the boost and protect the turbo as well as the aftermarket one? HELP!?!?

  9. #548
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    Mine holds just fine.

  10. #549
    Registered User Quantum-Racing.com's Avatar
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    They hold well enough, but when I installed a big FMIC along with an HKS pull type BOV, I left my profecB alone and my target boost went up from 16 to 17 psi.
    Gain from that what you will.

    I have yet to see a stock push type BOV that will hold much over 18psi or so without leaking some unless it had serious spring pressure and then it would have slight release issues in low pressure situations.
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    Question Stock Bypass valve question

    Does any one know of a mod you can do to your stock Bypass valve to make it a 50/50 BOV? I have to admit that the whoosh sound is what I want, but I want to maintain part of what the factory had planned for the excess pressure. Or will I have to bite the bullet on this one and just buy a 50/50 BOV?
    Shane
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  12. #551
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    if you get an cai . and a mbc you can here the woosh . i can here mine w\ the stock bov on
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  13. #552
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    Someone said you can hear the bypass valve go with the air box mod, but I couldn't really hear it. I want it to be pronounced, yet function somewhat like the factory intended.
    Shane
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  14. #553
    Registered User XRW URABUS's Avatar
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    Re: Stock Bypass valve question

    Originally posted by AE2RSM
    Does any one know of a mod you can do to your stock Bypass valve to make it a 50/50 BOV? I have to admit that the whoosh sound is what I want, but I want to maintain part of what the factory had planned for the excess pressure. Or will I have to bite the bullet on this one and just buy a 50/50 BOV?
    I also like that sound but would like to keep the dynamics the same as stock.
    There must have been a reason to re-introduce the excess air back into the system. (Maybe to maintain boost? I have no clue)

    I'm hoping that I might have come across something that will give us that sound along with maintaining the original dynamics of the bypass valve/BOV.

    My brother owns a VW 1.8T and I just happened to look at one of his favorite sites. Low and behold I stumbled on a BOV Made for the WRX and which maintains the stock Subaru Dynamics. I hope this will lead to something.

    If anyone is knowledgeable in the BOV department please check out this site and let us know!!!

    Info on the GFB brand BOV...click here

    The GFB brand WRX Direct Fit Hybrid BOV...click here ...You will need to scroll down a bit to find the WRX section.

  15. #554
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    The reason why it recirculates is to keep the same amount of air in the system the MAF sensor has already seen, or so I read. If I am wrong, please someone correct me. But I was thinking. If I removed the hose for the recirculation, wouldn't that give me a 100% atmospheric BOV? That being the case If I put a T or Y fitting in there with the open end diameter smaller than the coupled ends wouldn't it act almost like a 50/50BOV? I realize the proportions would probably be off, seeing as how the air is going to take the path of least resistance. Am I way off here or could I be on to something?
    Shane
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  16. #555
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    I have heard of people using the Go Fast Bits (GFB) BOV and liking it very well. It is of the 50/50 that I speak of. 50/50 meaning 50% recirculates and 50% vents directly into the atmosphere. i figured this would be the one I would get if I cannot figure out a way to make the stock valve work to my liking!
    Shane
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