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.
lol.......i know.... i think all new members should have to read through all the engine performance stickys before their allowed to become a member........
Two trains left the station at the same time and traveled in opposite directions. The E train averaged 130 mph. The A train's average speed was 110 mph. In how many hours were they 480 miles apart?
Actually two hours is incorrect. TR said "average" speed. You then don't actually know what the actual speed was over what time period. So, if the question was phrased as constant speed then the answer would be two hours.
But given that there's not a train in existence that can instantly accelerate to over 100mph, there would still be quite a bit of error in the calculation.
If it accelerated to 150 and stuck there for a few minutes then dropped down to 130 and was a tilting train so it didn't have to decelerate for corners... then it's possible.
I was watching a video on youtube today that said the kid had the SPT intake and exhaust, but the car also sounded like it had a BOV. Is this noise associated with the intake, or does he have a BOV that he didnt list? thanks for the help...here is the video clip.
I think we have 1 of these posts a week. it's fine! If you're really concerned about what makes the sound...Use search on the top menu bar like you should have in the first place...
Yo Sinister, If this is about the question i asked, ya know it would have taken you a quarter of the time that it took you to write this to just answer the question. my question was if some intakes make a slight BOV sound....im not concerned about anything...its not on my car...just wondering, way to be a dick about it.
P.S. I did you the search on the menu bar...it brought me to this thread, and im not about to read through the entire BOV thread that started in 2001.
hey i know its prob one of the most stupidest questions to ask and you guys have prob answered this but i just bought a SSQV bov for my 06 subaru. and i'm just wondering how to do the hoses. i put the ssqv on and i hooked up the stock hosing up to the bov and i pluged up the return hose. and i started the car up and it idles really rough. the engine revs by itself to prevent it from turning off. and then it just putters out. i'm not really sure out to install the hoses or how to set them up. can sumone help
I would delete this if I were you. It should have come with instructions. I really hope your serios and not messing around. But I'll tell you how.
1) make sure you have an adapter flange.
2) remove stock BPV on the I/C, 2 12mm bolts, 1 "pinch" hose clamp, 1 vac line, don't lose or rip or gouge the gasket.
3) install new BOV onto flange
4)Plug recirc hose with hose plug, use new wrom type clamp aka screw in type
5) take gasket and put between I/C and BOV
6)Bolt on new BOV, make sure you haven't lost the triangluar gasket and is seated properly
7) Hook up the vac. live to the nipple the size of the ID of the vac. line.
8) start up the car, make sure the idle is steady, if not you have a leak.
9) go drive it, make noise, and make sure that your rpms don't drop off when you shift to neutral
10) come back on the forum, read stickys, FAQ, or SEARCH!!!
11) install stock BPV
I don't know why I did all this typing!?! I could have been a D**KHEAD and said just search, or just gave him a simple link with no other words
lol...thats what he will end up doing..
buuuut its been known that the Go fast Bits Hybrid BoV is the only bov that doesnt cause problems...used on esx sti's. what i heardddd
i did all that you told me to but my idle is all ****ed up. plugged up the return hose, reconnected the vac lines and all that but the idle is just reallly crappy. goes up and down
yah put in the gasket. everything. one prob is that the ssqv is a knock off . it doesn't have the spring adjuster so i think the bov is leaking prematurelly and i don't know how to adj it ><
Yes it would, stock bov stays open at idle and recirculates air back, trying to force it to stay shut on a maf based system is not going to work right.
Just put the stocker back on, your causing harm to your car.