*Blow Off Valves* - The Basics of Blow Off Valves, Bypass Valves & Hybrid Valves - Page 2 - Subaru WRX Forum
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post #16 of 27 Old 02-24-2009, 07:21 PM Thread Starter
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Originally Posted by CuzImChinese View Post
is this only for subaru or all cars in general?
cus i'm also wondering about evo's
i wonder if evo's also use bypass vavle
The above can be loosely applied to all turbocharged motors with a MAF sensor.
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post #17 of 27 Old 07-20-2009, 02:48 AM Thread Starter
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sticky anyone?
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post #18 of 27 Old 07-20-2009, 01:10 PM
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I disagree with most of this OP as bad technical advise and have explained so in the thread. I didn't sticky it for a reason and if you want to request stickies in the future, please pm me rather that discussing it here.

Hybrid BOV's IMHO are the worst of both worlds, not the best. First off they are unnessisary. Second, they're illegal. Third, they are more sensitive and need to be adjusted more carefully to work properly. They are much more likely to be improperly installed and cause more problems even than a straight atmospheric.

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post #19 of 27 Old 07-20-2009, 02:02 PM Thread Starter
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I disagree with most of this OP as bad technical advise and have explained so in the thread. I didn't sticky it for a reason and if you want to request stickies in the future, please pm me rather that discussing it here.

Hybrid BOV's IMHO are the worst of both worlds, not the best. First off they are unnessisary. Second, they're illegal. Third, they are more sensitive and need to be adjusted more carefully to work properly. They are much more likely to be improperly installed and cause more problems even than a straight atmospheric.
All of your hybrid concerns were explained in the first post, and I mentioned that they were the best of both worlds 'theoretically'.
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post #20 of 27 Old 07-20-2009, 05:22 PM
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Aftermarket valves usually contain a bigger "bore" that can move more air than the stock valve.Also as well,not all "hybrids" work the same.The TurboXS and like valves always vent to atmosphere and recirculate regardless of boost pressure.There is no "dual stage/2 stage" venting like the APS or Worx valves.The TurboXS has smaller areas that vent to atmosphere and the recirculation elbow is the least path of resistance.So you do have that plus ones like the GFB that can be adjusted from fully atmospheric to fully recirculated with steps in between (70/30,60/40,/50/50,40/60)

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post #21 of 27 Old 08-20-2009, 08:37 PM
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Awesome! Thanks for the info. I was thinking of putting a BOV and my wrx and was woundering the pros and cons. seems like it won't really do any thing ( ad horse power or make the turbo spool faster).
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post #22 of 27 Old 08-21-2009, 10:51 AM
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Ok so Im still kind of new to the site so I have 2 questions... 1 what is the "hammer mod" and 2 what is a sticky?? Thanks.

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post #23 of 27 Old 08-21-2009, 02:18 PM
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Hammer Mod--taking a hammer and "crushing" down your stock BPV to tighten the spring since it cant be adjusted any other way. A sticky is something that is made permanent and put at the top of the forum for general information, kind of like the FAQs for the sections.

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Last edited by newtothegame; 08-22-2009 at 06:09 PM.
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post #24 of 27 Old 08-21-2009, 05:44 PM
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Originally Posted by newtothegame View Post
Hammer Mod--taking a hammer and "crushing" down your stock BPV to tighten the spring since it can be adjusted any other way. A sticky is something that is made permanent and put at the top of the forum for general information, kind of like the FAQs for the sections.
Glad someone explained what the hammer mod was, I was wondering what it was as well. I have to admit tho made me laugh a bit, I pictured myself opening the hood of my car and just whacking my BPV with a hammer.

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post #25 of 27 Old 08-21-2009, 08:56 PM
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Lol, I did miss a part in that though. Its best to put a 2x4 or something to absorb some of the blow from the hammer, unless you are using a "dead-blow" hammer on it.

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post #26 of 27 Old 08-22-2009, 12:42 PM
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thanks josh for that explanation.

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post #27 of 27 Old 08-22-2009, 02:57 PM
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No problem Chuck. Glad I could help out.

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