"The BIG BOV thread" (Where all bov question threads get merged) - Page 782
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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; Originally Posted by CoolGuyRx2 Gotta quick question for the pros. For ****s and giggles, did the quick run around the ...

  1. #11716
    Registered User Crazyced's Avatar
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    Quote Originally Posted by CoolGuyRx2 View Post
    Gotta quick question for the pros.

    For ****s and giggles, did the quick run around the block with the stock bov running atmospheric. 2013 limited model. With the recirc hose plugged, I got on it and nearing 4500rpm I could hear the stock valve opening to release pressure under boost.

    Should the stock bov bypass air that early? Or is that just because it was no longer recirc-ing?
    If you did in fact seal off the recirculation tube properly it's definitely possible that your BPV is either leaking or being pushed open. The only way to properly test is to remove and plug the recirculation tube (like you did) and do a boost leak test.
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    It was a bit rough until I cleaned it up with the sanding bit. I doubt Subi engineers would retool the casting, but hey ...worth a try

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    Quote Originally Posted by Crazyced View Post
    If you did in fact seal off the recirculation tube properly it's definitely possible that your BPV is either leaking or being pushed open. The only way to properly test is to remove and plug the recirculation tube (like you did) and do a boost leak test.
    Thanks!

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    Quote Originally Posted by Crazyced View Post
    If you did in fact seal off the recirculation tube properly it's definitely possible that your BPV is either leaking or being pushed open. The only way to properly test is to remove and plug the recirculation tube (like you did) and do a boost leak test.
    No. Seriously you can't use the BPV as a BOV even if you plug the recirc. It doesn't work this way!!
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  6. #11720
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    Quote Originally Posted by zax View Post
    No. Seriously you can't use the BPV as a BOV even if you plug the recirc. It doesn't work this way!!
    Please elaborate.

    A bypass valve, stock or otherwise, is a simple valve, held shut by a spring and actuated by air pressure differential acting upon a diaphragm. Nothing more, nothing less. Where the air is discharged matter very little to the BPV itself. The fact that some valve are actually hybrid while others come with the recirculation adapter shows that the only difference between the 2 is where the air is discharged.
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  7. #11721
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    The bypass valve is expecting to have a vacuum on the side of the outlet because a vacuum is generated in the turbo inlet where the bpv outlet is connected.
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    Quote Originally Posted by CoolGuyRx2 View Post
    It was a bit rough until I cleaned it up with the sanding bit. I doubt Subi engineers would retool the casting, but hey ...worth a try
    I doubt they would too. They probably designed it with that outlet diameter in mind for a specific reason. They don't just waste materials for no reason.
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  9. #11723
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    Quote Originally Posted by Sinister View Post
    The bypass valve is expecting to have a vacuum on the side of the outlet because a vacuum is generated in the turbo inlet where the bpv outlet is connected.
    While true, the vacuum would technically pull on the valve and make it open earlier. Now doing a little bit of reading this might be why there's a small hold in the stock BPV (never noticed before). Although I could be wrong.
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  10. #11724
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    I did a little more reading and the hole is actually a boost source for the bottom of the diaphragm. This means that at WOT, the pressure should be equalized across the diaphragm, making the spring the deciding force (the surface area of the valve itself also needs to be considered). This also means though that at idle, part throttle and (marginally) during spool up, there would be more pressure from the intercooler side then from the manifold side. This would potentially crack the valve open depending on the rate of the spring.

    My only guess as to why they did this would be to fight low boost surge flutter.
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    Turbosmart bov on 2011 wrx

    Got the vaule working back fire little where vent but when car is cold vaule doest open right car got be warmed up is that normal


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    Wait, what?

    Dude, full sentences, proper grammar, correct spelling, etc. would be a great help in figuring out just exactly what you are trying to get at here.
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  13. #11727
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    I installed the turbo smart dual port bypass vaule


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    When vent too atmosph it back fires some. On cold days if car isn't warmed up the vaule doesn't open like it should when driving


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    Once the car is warmed up it opens is this normally. U understand now


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  16. #11730
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    Yes it's "normal," the afterfire is due to the rich condition on throttle off from releasing metered air to the atmosphere.

    Now you understand why VTA BOVs are not recommended on MAF-fueled cars.
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