This is the big BOV thread. If you didn't find this thread, you didn't search.
This thread is where all BOV question threads get merged into.
The quote below in this first post is from our BOV info sticky and contains links to some very explanatory BOV information. Please take the time to explore the links before you ask repeated questions.
A stock WRX/STi comes with a BPV (Bypass valve) which is a vacuum-actuated valve designed to release pressure in the intake system when the throttle is lifted or closed. This air pressure is re-circulated back into the non-pressurized end of the intake before the turbo.
An after market blowoff valve (VTA) does basically the same thing BUT unlike the stock unit it releases air to the atmosphere (giving you the loud sound). Some people see an after market BOV on a stock WRX as being in poor taste (probably due to the fact that it is basically a noise maker that really as no other benefit), while others simply find the sound very attractive.
Proponent opinions notwithstanding, there is a small mechanical downside to having an after market BOV (VTA) on a stock WRX. The problem comes when releasing air to the atmosphere that has already been metered by the mass airflow sensor. When the BOV releases (blows off), the ECU will be injecting the wrong amount of fuel into the cylinders. The engine temporarily runs too rich (meaning too much fuel is injected into the cylinders). This temporary rich condition isn’t typically THAT harmful, but it may cause bucking or hesitation on lift-throttle as well as some other concerns outlined in the links below.
curious about putting a BOV on my 08 wrx hatch...heard some things could go seriously wrong...can someone pm me or post areply letting me know what experiences they have had
about your 08 hatch...like i said, as long as its a plumb back/recirculating or daul port bov youll be fine...its the full atmospheric bov's that cause your motor to run really rich and destroy it
Does a forged replacement count? Like a GReddy RS with return pipe? It's still a BPV, doesn't really make any noises that the stock piece didn't make, but it sure looks a lot better... I trust it a bit more... but is it da' wanks?
I believe that VTA is wack... unless you are pushing over 400 horsepower, and it is immediately justified that all motor hardware had to be upgraded to maintain safety... at which point it is fun on the weekends, but to get to work and park politely... um, no...
I am all for upgrading to a better quality BYPASS valve, but blow-off is for racing. There is something classier about a polite-sounding car that can still pass the rest.
Can someone direct me to a thread explaining how to delete my HKS bov and reconnect the stock BPv? I did a search and looked at the links but I'm not coming up with anything.
If you get a Dual BOV, it will not harm the car. Atmospheric BOV are not worth the long term harm. I have a Recirculating BOV and is working great. It does realese some pressure that is not needed. Turbosmart BOV Dual is the safest out of all i have researched.
Hello, let my start off by saying I'm new here, I just bought my first WRX last weekend. The previous owner installed some things I don't really agree with which I am changing out for either stock or better replacements, one of these things is an HKS blowoff valve. From what I am reading here it sounds like I should go back to the stock bypass valve, the problem is I have been looking everywhere online for a week straight and I cannot find a single one, new or used anywhere. I don't want to go to the stealership because I know it will end up costing me more than if i just get a new aftermarket recirculating one, and since I'm a college student I'm kind of on a budget. Does anyone happen to know where I can find one? Believe me I have spent a good deal of time searching, I'm not new to forums so I know better than to ask before I have looked for myself.
I'd recommend going to Nasioc, finding your region, and post a for trade thread. Or contact one of the many local vendors and see if they have one laying around.
I'd recommend going to Nasioc, finding your region, and post a for trade thread. Or contact one of the many local vendors and see if they have one laying around.
NASIOC has much more detailed info in the 'technical' area, and a larger base for used parts for sale, IMO. If you can put up with the BS.. Why post it twice
its nice to have 2 memberships mrkenny, if you are working on a particular problem or build or whatever it may be ppl on here will kno of your personal problem and remember whats going on with you. on NASIOC no one is going to remember or care about your problem, along with good info there will be more incorrect info there as well. i have my account there largely for buying parts because there are more available, but you also have a more likely chance of a scam with the massive amount of members.
its like living in a small town vs large city, if you like interacting with different ppl every time u do something then NASIOC may be for you. if you like getting used to ppl and knowing what they are all about then this may be a good place. ur choice kenny.
It's a great place to buy and sell parts and a good place to link to existing threads from. For anything else, well....see my post in that thread above.
Because most people on this forum do not feel they are elite or feel they need to stick to one forum for all their needs.
Both sites serve a distinct void in this community. If I need to buy a box of 5,000 razor blades I go to BJ Wholesale Club or Sams Club....if I need a jar of grape jelly I go to the local market.
Either way...on both forums you can communicate without using curse words or symbols which represent them....well maybe you cant but most can.
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