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This is a discussion on Bpv with tmic within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Mines on the side...... Wrx...

  1. #16
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    Mines on the side...... Wrx
    2013 WRX sedan - MODS = pretty much ever bolt on.

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  3. #17
    Registered User Yamahar6311's Avatar
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    Ahh that's right. Cool!!! Well glad to help 😁

  4. #18
    Subaru Newb MainFrame's Avatar
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    Blow off valve and bypass valve are just different terminology for the same thing. What's important is if they're recirculating, or VTA.. you want a recirculating valve.

  5. #19
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    Thanks for the help guys
    2013 WRX sedan - MODS = pretty much ever bolt on.

  6. #20
    Registered User Yamahar6311's Avatar
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    Quote Originally Posted by MainFrame View Post
    Blow off valve and bypass valve are just different terminology for the same thing. What's important is if they're recirculating, or VTA.. you want a recirculating valve.
    Does he need a recirculating because it a Wrx?

  7. #21
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    Wrx and STI both have recirculating. U can't have "vent to atmosphere" unless you tune for it
    2013 WRX sedan - MODS = pretty much ever bolt on.

  8. #22
    Registered User Yamahar6311's Avatar
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    Do not let this make you think you absolutely need one, however. Most turbo cars, such as the WRX/STI have a stock bypass valve that is designed for the levels of boost the car is running normally that will work perfectly. The only reason you would want to upgrade to an aftermarket BOV is if you want to run quite a bit more boost than stock (20psi on the WRX/STI). At this point, the compressor surge can be greater than the stock BPV can handle.

    Problems: There is one certain problem that aftermarket BOVs can create. The air that they release has already been measured by the mass air sensor, so when this air is gone after the BOV blows off, the ECU will be injecting the wrong amount of fuel, causing the engine to run rich for a second. This can damage the catalytic converter after time. This can not be fixed with engine management.

    Take all these factors into consideration before buying a BOV. Happy modding!



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  9. #23
    Subaru Newb MainFrame's Avatar
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    Quote Originally Posted by Yamahar6311 View Post
    Does he need a recirculating because it a Wrx?


    He needs a recirculating valve because Subaru uses draw through MAF based tuning logic. (also, recirculating valves are much less prone to leaking due to the vacuum drawn on the recirc side of the valve.. couldn't help but notice you have a HKS SSQV installed, one of the main atmospheric BOVs notorious for leaking)

    Not that your car absolutely has to run a recirculating valve, but they do perform better.

  10. #24
    Registered User Yamahar6311's Avatar
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    😓 I know, I bought it when I got it a year ago. I will unfortunately wait till it does then by a reliable bpv.

  11. #25
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    Quote Originally Posted by Yamahar6311 View Post
    From what I heard, on the up side it will better your throttle response
    Righttttt.....

    I'm going to assume you are NOT running 30+ PSI, a blow-through MAF, or Speed Density fueling. In which case, what you posted is incorrect. The stock BPV is more-than capable of relieving excess pressure and it is unlikely you will experience any improvement in transient response unless you satisfy the above conditions.


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  12. #26
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    Quote Originally Posted by Yamahar6311 View Post
    The only reason you would want to upgrade to an aftermarket BOV is if you want to run quite a bit more boost than stock (20psi on the WRX/STI). At this point, the compressor surge can be greater than the stock BPV can handle.
    The main consideration for upgrading the stock BPV is leaking NOT compressor surge! A stock 2002-2007 USDM WRX/STi will hold up to 20 PSI. After this point, the BPV may not seal under boost resulting in a boost leak. 2002-2007 metal BPVs could be modified to hold higher levels of boost, unlike the newer plastic BPVs. JDM STi BPV will hold up to approx. 25 PSI of boost. At boost pressures 20 PSI and under, the stock BPV is far superior to an aftermarket piece.


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  13. #27
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    Quote Originally Posted by zax View Post
    Righttttt.....

    I'm going to assume you are NOT running 30+ PSI, a blow-through MAF, or Speed Density fueling. In which case, what you posted is incorrect. The stock BPV is more-than capable of relieving excess pressure and it is unlikely you will experience any improvement in transient response unless you satisfy the above conditions.


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    Once again I only heard and your right, never got into specifics but good know. I learn something new everyday. Thanks zax


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  14. #28
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    But my stock bpv was plastic though not metal like you said the ones you mentioned
    2013 WRX sedan - MODS = pretty much ever bolt on.

  15. #29
    Registered User Yamahar6311's Avatar
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    I'll let zax answer this. He seems to know it all.


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  16. #30
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    Quote Originally Posted by elblanco1987 View Post
    But my stock bpv was plastic though not metal like you said the ones you mentioned
    2008+ WRX use the Legacy GT style layout, which includes a plastic BPV. It is not [easily] possible to modify this BPV for high boost, and they are rumored to leak at pressures above 17-18 PSI. Most 3rd gen owners looking to modify past OTS stage 2 tunes opt to use a Forge BPV.

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