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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.

Thanks!


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.


Links for BOV info:

Sinister's BOV FAQ

Wikipedia

Unabomber on Nasioc

Davenow on Nasioc





 
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Which Turbo XS BOV is this? There are 2 different ones I believe and do you need any flanges or anything?

Oh yeah any pictures??
 

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I'm pretty sure Go Fast Bits is it's own company and MRT is just a distributor. MRT likely sells their own BOV.

I may be mistaken.
 

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Yes to the above. :) They are the MRT made BOV's. That's the BOV that i'll be getting after my 1k breakin.

Looking forward to it. :)

I've heard nothing but good from those that have it.

I've seen and heard the TurboXS one and it's nice, but I didn't care for the purple color and the 100% atmospheric. The MRT one can do a 50/50 vent which I want. :)

~V
 

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I have the GFB and it is awesome. I originally had it on 100% vent and it sounded great. Then I tried it 50/50 and it sounds good as well. I'm still running 50/50 now. Check it out...Dan at Vivid is a great guy to deal with...really cool.:cool:
 

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I don't know why you would be having this problem....I got mine like 4 days after I ordered it. Have you talked to dan yet?

Nick
 

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I sure have... Even though the website said they were in stock when I purchased it, he said that they have not arrived yet. Arrrgh. And my CC was charged already. Most places don't charge unless the item has been shipped. Just want to get what I paid for and not feel as if I made a $216 donation to charity.
 
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how do u remove silencer??

hi there,
I was wondering if someone can tell me how to remove
the silencer on the BOV.......

thanks..........
 

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A friend of mine in his MR2 removed the hose that connected to the intake from the BOV. He closed off the intake and let the BOV hose vent to the atmosphere. He claimed it was real loud, like hearing the brakes from a bus. I thought I could do the same but it looks like its too much trouble :).
 
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