This Is Why You Shouldn't Use a BOV On A Stock WRX/STI
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- Опубліковано 30 вер 2024
- I see this come up a lot and because I had the parts in the garage I wanted to actually show everyone what happens when you use a BOV on a Car that is utilizing a MAF (Mass Airflow Sensor). The issue is that when you change from a bypass valve to blow off valve you are loosing all of the metered air that the MAF has already accounted for. As a result the car will run more rich when it is under load when the BOV Opens. The car sends too much fuel and not enough air into the engine. This can result in Fouled Plugs, Stumbling, Unburnt fuel can start to destroy your catalytic converter among other issues. Hopefully this helps to show the potential issues with installing a BOV. Now I can't stop you from doing so and if you have to have the sound that I would suggest you get a hybrid BOV that still recirculates some of the air back into the system.
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Go Fast Bits Bypass Valve (2015+ WRX): amzn.to/2XWkYWa
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![Is it safe to vent your Blow Off Valve to atmosphere? [GO FAST BRETT]](http://i.ytimg.com/vi/bsy9hJic7cQ/mqdefault.jpg)
Hey man, there is no way that it would make a difference running that low RPM, The BOV only opens up to let the air out when the boost pressure is above 0 (Hence the BOV sound). Anything below 0, you should not even notice the difference because it's a closed system... So with all do respect, what you are saying does not make sense. If its open below 0, that would indicate a boost leak.
especially when running something like the GFB TMS Hybrid. Zero chance you’re gonna mess up the closed loop system if you’re setting the spring tension correctly. That’s literally it.
Good reply, the poster never replied to this because you mention facts.
Let me know when you start making videos so I can follow you instead. Your comment is common sense, literally entering the chat.
@@panderalexander exactly
I blew up my 2011 wrx because i added a bov on my cobb OTS map. ran lean and threw a rod
This is a common myth. The system is dependent on 1) the TPS signal, and 2) the BOV itself.
Modern fuel injection system do a fuel-cut on decel to 1) save gas, and 2) alow the revs to drop faster; the fuel-cut decel should override any fuel delivery (issues).
If the TPS is slightly off, it'll keep shooting fuel on decel - this is how you get the popping on decel or in between shift.
If the BOV doesn't seal fully (which it sounds like this is the case in this video), you get an intake vacuum leak - what were the vacuum #'s before and after the BOV install? Was it the same?
I've seen plenty of BOV's that leak on WRX's / STI's...
Making a BOV that 100% seals at idle makes it more expensive to produce.
If the BOV is sealed 100%, the system is closed, and your idle should be identical to before - the fact that you're running rich means something else has changed.
This is why some people have no issues, and why some people do have issues.
Jesus christ ur good
You are 100% right a bov shouldnt affect idle unless its leaking
I was gonna say I bought my 19 wrx used that came with an HKS BOV and it’s closed system, i didn’t think it had a MAP for it installed already but I don’t have any idle issues what so ever since purchase. Seems to be working A OK. Still need to get an AP for her but other than that no issues still 🤞🏻🤞🏻
I'm not that sure.
I have a Suzuki Swift Sport ZC33S (from 2018), and I installed recently (a month) the HKS SQV IV valve and I'm experiencing some of the symptoms that he says.
Today I'll mount the recirculating tube, to see if that mitigates the lagginess and stuttering in very low revs, like when I'm in the middle of heavy traffic.
Saddily I'll lose the high pitch sound, but in the long run I prefer to not to damage the engine.
Or they don't block the recirc hose that goes to the intake after MAF
Jokes on you I don’t have cats
Read this as I was thinking it🤣🤣🤣🤣🤣
What do you mean is a bov better for catless
What do you mean are the bov better for catless
Same lol
Same
Now that you mentioned it, you gotta make a video explaining speed density
Thats difficult, ill see what I can do to make it easily understandable 🔥
MAF measures the mass of air that enters the engine. Speed density calculates the amount of air that goes in the engine by measuring pressure, manifold air temp and rpm. You must use a float valve style BOV that does not stay open under vacuum. If so you simply need to change one number in the tune. His engine is actualy over correcting for running lean because its sucking in air at the BOV.
I did a ton of reading about speed density vs maf tuning for my lt1 corvette motor. Same concept different platform. I’ll see if I can find the link, it’s a ton of relevant information to the topic
See, its a missconception. You can use a twin piston/diaphragm type atmospheric bov on maf setups and they work as perfect as they do with the recirc valve.
If you were car guys youd know this...
Ive run a loud bov on every turbo car ive had and all being maf setup.
Do some research and stop talking shit.
@@Smeedia What about a HKS Super SQV4 Blow Off Valve would still need a full speed density tune?
I like how he "smelt fuel" when afrs were stoich
"I'm scared because the rpms are dropping low" probably because the ecu is trying to re learn everything. What exhaust is that? Kinda sounds like dookie
Idk man, I know science is science but I’ve owned 3 Subaru’s, rocked a BOV and OTS tune on all 3, put easily 75k+ miles on all 3, and had 0 issues related to the BOV. All cars were tested and healthy at time of sale. Maybe I’m just the lucky statistic 3 times over. Nice video and very informative though, keep up the good work
Justin Geier same loool
I've seen some cars respond different using OTS Tunes, if you have a higher quality valve it would mitigate out some of the leaking issues that other valves have had.
Right. I just installed a fully atmospheric bov on my 2018 sti and I didnt have an of these issues that smeedia has. Maybe theres some underlying issue causing the knock in this video? I installed mine after watching and did little revs like this and not a single issue. Maybe its cause his bov spring was too loose and was by passing even the slightest bit of pressure? Maybe it's not having that long pipe on the ic piping for the stock bpv location? But I dont think that knock issue is directly because of installing a vented vs recirc valve.
@@enemen8 The car is not designed for it, doesn't mean you can't get away with it. Typically the Supreme crowd or "younger" crowd throw them on without knowing anything, go get a tune and ask for the "Can i get a dope crackle n pop tune with a touch of flames out the exhaust, bruh?"
@@enemen8 no matter what it's not good for the car
What are your thoughts on the HKS blow off valve with the recirculating kit to make it a bypass valve?
If you setup BOV correctly the car will not idle or run ANY different, unless you did it wrong then it will idle differently, or its a POS like that valve,
If you can smell fuel or it runs different you done screwed up and not installed it correctly or its not adjusted correctly,
during idle the valve is 100% closed and doing nothing so wont effect anything.
(High quality valves like GFB Hybrid are the best and cant even leak even if 100psi boost)
Makes almost no difference it only runs lean for 0.15 - 0.3 seconds when you let off the gas and as you are not making power it does not matter if AFR's goto full rich
If coasting down a hill in gear AFRs are meaningless as injectors are shutoff during coasting.
Even the guy who started the rumor in the UK admitted to it after like 15 years that he was just making it up as he hates all the ricer Subarus going around making blow off noises (Ricer/Racer boys)
It all started from him and was just a joke,
Just like the DR who joked about Vaccines causing Autism in a paper he wrote and accidentally started the now stupid idea people have that its real, Even year later when he said it was just a joke in the paper he wrote people wont believe him and say he must have been paid out by Big pharma.
Put it on dyno and watch the lean condition is so short if you blink you WILL miss it as human eye takes .25 seconds to blink so easy to miss a rich condition that last .15-.3 seconds.
If you are serious about tuning should be replacing the plugs every 10,000KM as they will be copper spark plugs which are best for fuel burn and so on.
Also you said that the extra fuel would get into your oil as it ran down the cylinder wall. You would have to be running insanely rich to have left over liquid fuel in your combustion’s chamber(like 5:1 gasoline). Also your wideband afr gauge on the right side of your steering wheel was reading anywhere from 14.5-15.1. Not rich at all as the stoichiometric air fuel ratio of gasoline is 14.7:1
This video makes me laugh lol “the car smells rich “ I installed a hks bov on my sti and had no problems honestly it’s running great,
Talk to your tuner.
As long as your not on an OTS Tune with the BOV its not a huge issue. A protune fixes a lot of the out the box issues associated with just slapping one on
Smeedia I believe I’m on a OTS tune at the moment, I have to talk to my tuner but it’s so weird that your car has symptoms like that. Have you had any updates on it?
I pulled the BOV off the car after the vidro and stayed with the bypass valve, im going on a hybrid speed density tune so because I am still utilizing some of the MAF I'm sticking with thr BPV. But based off of what I did im sure the BOV was leaking air causing idel to be all screwed
Smeedia I would like to come help you maybe the rubber inside the inserts were not tighten down? Or the rubber seal bad? Also my kit came with a recirculating kit with my hks bov, if you want you can try it on your car if you wanna run the hks!
I only used the BOV as an instructional piece for the video to demonstrate the effects of an out the box BOV on an OTS TUNE. But greatly appreciate the advice!
Id guess you done have it setup right. My GFB Hybrid BoV was installed by a master tech at a Subaru dealership and I have 0 problems. Its running about 50/50 recirc/vta. Also its only going to "run rich" for a split second during a high rpm shift. If anything that split second of rich is going to help vs engine knock.
Its been on the car for 2 years (35k+ miles).
how much you pay for it?
I have the same BOV on my 2015 STI Works amazing with a higher hp setup too. No dedicated tuning but I will be tuning this winter
@@jeprodigalson792 Im at 72k miles now everythings still great. Still no tune.
Aren't the problems you speak of only if you do a vent to atmosphere & have cats???
Smells so rich because you have the valve right open, should be at a minimum 50/50
I have an fully recirculating hks bov paired with a cobb big sf intake. E-tuned by William Knose at Delicious Tuning by the way. In my opinion, this is the way to go if you want those spooly boy noises. The stock airbox muffles alot, so you can certainly hear the bov noises through an upgraded intake. Side note, my hks bov is a 13 year old original version from 2007, that was still brand new in the box that I never used for a prelude build I never finished before joining the Marines.
Thats a good find to be able to reuse! And the intake really helps to bring out a lot of those noises as you said 🔥
@@Smeedia Is the BOV different when the car has MAP rather then a MAF? 2018 Hyundai Elantra Sport to be exact. thanks
@@perziano6134MAP and MAF are not interchangeable unfortunately
I should’ve watched this video before I almost messed up my engine..got a 2004 wrx and installed this bov the whistle so freakin nice but after few months the sounds started to go down until its gone and after that i startedto hear like fluttering noise from my engine and dont know wth is going on even my mechanic got headache i gave him tylenol..please listen to this guy and dont install that piece of crap.🤓
🙏🙏🙏🙏🙏
Bpv delete for high pitch PSSHHHHH-STUTUTUTU ezpz
Makes no sense. If you had true in depth knowledge on this you would know that installing the bov wouldn’t change the idle of the car one bit. The only time the blow off valve will effect the air fuel ratio of the car is when there is pressure built up in the manifold and then the throttle is closed (during shifts) although I don’t run a bov on my car because I prefer the performance gains of a bypass valve(keeping more air in the engine during shifts) they will not hurt the car. As you said they will make it run more rich during shifts which may foul spark plugs faster but really won’t make a huge difference. On top of that Subaru’s use open loop fueling once in higher loads even when you are pro tuned with a cobb. Open loop fueling uses a target air fuel ratio or lambda and can very slightly adjust injector duty cycle to change your air fuel ratio and get it back to normal. Also you mentioned that the car showed some amount of fine knock learn when you were leaving the driveway which cannot be due to the bov. Fine knock learn is a ignition timing adjustment that the ecu makes over a long period of time when it tends to see knock at a particular load and rpm. If the bov was causing some sort of detonation, you would see that in feedback knock which is a real-time adjustment made by the ecu immediately when it senses detonation. Just thought I’d give you my .02 since I have built a few of these engines and tuned a couple
still, a newbie would put on a bov because it sounds 10000000x cooler.
Hehe
Im a ricer that wants to run a bov and muffler deletes on a stock sti 😭😭
Hope all Subaru owners are such drama queens. BOV doesn't do shit until you slam the throttle body closed, no way it runs any different just idling or even cruising speeds.
This made me proud of choosing the Perrin Bypass :)
Perrin is a good option to use! 🔥😁
@@Smeedia Excuse me but what's the purpose of replacing a bypass with another bypass?
Spring pressure, the OEM valve can hold around 20lbs of boost but once you start to exceed it you need a stronger valve
@@Smeedia So it's a must in highly modified turbo engines?
Yessir 🙏
And I’m still gonna do it✨
Great video! These videos are keeping me from ripping my hair out during this quarantine
Glad that they're helping my friend!
Dont use full vent to atmosphere like hks or greddy use a gfb or turbosmart adjustable bov.
My 04 literally sounds like a turbo diesel truck. Pretty damn lame whistles if you ask me. I want to pew pew pew when I shift.. how do I do it
Should be a simple answer - 21' STI only with ETS Extreme, would an adjustable GFB BOV set to 50/50 on OE be okay? Enjoy ya vids, thanks. 👍
Nice video bro
What if I'm running both SD and MAF running BOV should be good with pro tune? 400whp
So I'm new to cars period. I just ordered a 2021 WRX Limited and I want to learn all the things. I took a quick course they offered on post to learn basic engines, watch some videos to learn about the turbo, boxer, direct injection, etc. My understanding of all this is very very basic. If I'm watching this saying, math based car? Speed density? Blow off valve? Charge piping? Where can I start to learn about all these things? I got a little overwhelmed when I tried starting with nasoic. Long road ahead but I want to know. BTW I'm a nurse so I'm literally starting from the ground up. Thanks!!
Still baffles me why Americans refer them as blow of valves and by pass valves.... makes so much more sense to state it as vent to atmosphere or recirculating bovs
No explanation needed once you state them that way!
Biggest load of crap i seen in a while running at idle would do next to nothing the car isnt entering boost also with my audi i had diverter valves that could do full bypass 50/50 or vent to atmosphere guess how i ran it most yup vent to atmosphere and never caused a issue
If tuned accordingly is the bov still worth it? Or is it better just having the bpv overall even if tuned properly? I want the sounds but definitely wanna keep the engine as reliable as I can
im in the same boat!!! I want the sounds!!
@@jacksonr1337 I’ve had a gfb respons on my ej20 for ages with no issue, 30/70 atmospheric and recirc with a few adjustments to the valve spring tension to get it perfect and it runs like stock plus the cool noises
@@nes3382 in the exact same boat here. i love the GFB and have it set up the same way as you. Its definitely worth it to get an adjustable BOV like GFB or turbosmart!
@@jukebox9175 100%
I'm sick of hearing all this bullshit about how you shouldnt put vent to atmosphere blow off valves on recirculating cars with MAFs. We fucking get it. That doesn't answer the question that literally all these people are asking "How do I make my WRX/ STI make the blow off valve noise between shifts? WITHOUT damaging my engine." It's a simple question, but no one tells us the answer.
I'm sorry but this video is useless. All you said is why you think it's bad and showed the car running low rpm for a sec and stopped it. Why even post this?
what about just blocking your bov and having compressor surge. obviously a bypass valve would be better but would no bov be better or worse than having a bov
I don’t even rev my stock Sti to 5k so I hope I baby mine forever and keep it mint
I have a 2004 wrx and put the hks bov on and now the engine is throwing engine rich code and cylinder 1,2, and 4 misfire i put the bypass valve back on. how do i know if the damage was made or will the codes go away after awhile?
Mate there fkn made to rymun on those engines tbey dont destroy anything get a gfp respinse BOV tmive ran obe foe 2 years and my liberty gt 2 5 turbs loves it as yoy can vent to tbe sytem ir atmosphere which i run and it doesnt run rich at all
I think we got the point after the first 3 times you said if it runs like a bag of shit you’re not taking the car out 😂🤡
What a load of shit , bov are closed under throttle and at idle they only open for a second when you're underboost and shut the throttle if yours it opening and drawing air in at idle the spring load is wrong
idk, i got one for my bugeye and my afrs didnt change at all, im on a jdm motor and ecu and everything was the same as before
You did something wrong! They are a lot of subarus where i lived with bov and they run very fine
time for me to remove my blow3 off valve same issues lots of pops sounds could but now i know why the knocking and the smell.
I’m running a Cobb lf recirculating bpv car feels and runs like it did while the stock one was on it do I need a tune
All u proved is don't add stuff to your car without a proper tune. U can tune the car to not expect the returning air
So how can u get a bov then u need a intake sry Ik new to cars getting a 2022 wrx in July this year
I bought my 12’ STi with a BOV already installed (and intake and exhaust) and a protune. Seems to run great, anything else I should look out for or be worried about? Knock monitoring is all within normal limits. I’m straight ricer and dig the noises. If it’s okay, I think I’ll keep it. Will have tuner check out car just to be safe. What do you think? It’s just tough cuz there’s so much polarity in this topic… hard to get a straight answer
If it’s running great than fuck this guy 😂 listen to your car don’t listen to this twit spreading misinformation lmao
I have never had any issues with bov on subarus and I did run a go fast bits bov but still not a problem
Tighten the bov up and make sure it shuts before car goes to idle 🤣 aka no idea
I get that it's an MAF based engine. I have a stock tuned STI that I recently picked up with a 50/50 valve and an ETS front mount and an intake. Knowing how anal everyone is they are probably gonna die just reading that sentence. Yes I do plan on tuning it. The ONLY thing I've noticed vs driving my friends pro tuned car with a fully recirculating valve is that once I get near atmospheric pressure (0, no vacuum or boost) the car does tend to kinda stumble a little. Though I'm guessing that's more of the fault of the intercooler. The car has never smelled rich, even with a muffler delete on it. Never stumbles at idle, no dips at idle, nothing. These valves ONLY open once you reach boost. Sure you went into launch control, but boost is pretty low on that. Not only that, there was no apples to apples comparison here. What were the numbers before the BOV? The title is also "don't do this to your STOCK Subaru" my guy, your car is pro tuned and is far from stock. I don't see how your trying to make an argument when there are other people who aren't experiencing these issues, or if you have or have not experienced them yourself and if this is all just speculation. Also modern cars knock, ALL the time. The knock sensor is there to help find out if it needs to lean or rich the system to prevent it. The cars ecu makes the adjustments necessary. I'd bet that if you would let the ECU learn more, it would run better, instead of letting it idle for 5 mins, doing revs / launch control, going back and forward 2 or 3 times, and then saying "yep, BOV bad, only do recirc valves"
I installed turbosmart 50/50 on 22wrx, it stumbles if you're stationary rev and vent.
Bullshi* video.., Blow-Off valve has nothing to do with idle!!!...,
Been running my bov for 18 months on 380 HP wrx. No issues at all.. I stay up on maintenance, and plugs look normal. I recommend getting one if you want.
Did you get produced with it on the car? The major issue of it is using a BOV on a Stock car or one with an OTS Map which already have their own issues with them.
@@Smeedia it was the first mod I put on my car and I ran it for over a year before getting a protune.
Yo! Thank you bro! I am new to owning a wrx sti (2021) and I have relied on you to learn more! This is fantastic for people like me learning!
Glad I can help! Congrats on the car as well!
@@Smeedia Thanks man appreciate it!!
Lopez Kimberly Lee Susan Thompson Melissa
this guy's on repeat. Repeats the same thing 20 fucking times.
... what's the point of buying a subaru if you can't mod it how you want to
All I know my 1995 gst turbo eclipse worked fine no problems greedy bov great products, Also my 2020 honda 1.5t hks bov no problems ,you have to buy a quality products hks and greedy, and get it tuned shortly after u get it and who cares if u ruin your catalytic converter,buy another one ,just listening to your poop 💩 lol, oh and both vented to atmosphere so go get that turbo sound ,Whooshing!!!!
Basically, get a tune after modifying.
You said you were going to take the car out with the same reason about 6 times
If ur sayin it runs rich why isn’t the wideband saying so
I run twin piston atmospheric collins bov on my maf setup car as i have with all my maf setups without throwing an engine light.
Why would smell change with a bov install while idling. 🤔
I have the same "black" OBEY hat! 😂😂NICEn
and also why not just get a recirculating bov???
The BOV isn't what was causing your issues at idle. How could it when there is no boost to blow off?
Regardless, you can't tune for a BOV. I get really tired of telling people that. There is no special table for "WOT release" or anything. They do slightly increase how rich the car runs for that brief moment when letting off the throttle, more pops and bangs, which in turn can hurt the cat and turbo since those explosions are happening nearby.
With Speed Density, there is no tuning you can do either. It's just that the reference of MAP is a lot closer to the injectors than the MAF is, so there is a lot less time of fuel squirt at WOT release.
Anyway, I am so sick of BOV arguments, and this video makes it worse. 175k views and counting ;(
@@sssnake2332 Thanks for the explanation! I bought my '18 STI a little over a month ago which came with a GFB bov, and I've been reading forums on the subject ever since. I don't have any of the issues that Smeedia was having in the video so I wasn't too sure what to think. I love the sounds my bov makes, but I'm not going to keep it on at the expense of my cars health... :C
RIP 😢
Will I be okay if I install a grimspeed bpv on my stock 2020 wrx?
Yes 🤝
@@Smeedia thanks dad I can always rely on you ❤️ 👍🏼
Ik I always ask you for help and knowledge great subi lord but I need help I installed the gs bpv but no sound do I need and intake or something else or is the part not working like it should?
An intake will definitely help you get some of the sound 🙏 turbo inlet will help to increase it as well 🤝
@@Smeedia thanks what would the world do without our subi dad 👨 😢 🙏 ❤️
you make it seem like your engine would instantly blow up if you run a BOV on your car..... yea your car will run like crap..... that's the same for intake... you're going to have a "risk" of blowing up your car without proper mod/tuning. but instantly blowing up? come on bro..... it's not that serious
Never said it would instantly blow up, run like hot garage yes, personally wouldn't drive it with the idle being as it was but also tearing the car apart for. Build so don't want to replace anything not needed for the time being so being a little conservative with the car ATM
If this was Donut Media they would of just sent it lmao
I had a bov on my boosted frs and it ran like a freight train
It sounds soo cool but if they car isn't ready for it your not 😆
Omg.... what’s with the fucking camera work
i am a brand new owner to a 2015 wrx and i got a hks ssq blow off valve and i’m wondering if i need to get a tune for it or i can just install it right away and the car is stock
I'd tune for it, wouldent run one without a tune
It’s not even a stock sti. Do a video on a real stock sti. No nothing on it or time. Allot of people want this out of the dealership. This is what happens when you do this when you already have a tune.
Similar will happen on a srock STI, the MAF pulls data from what it is seeing such as mine. When you add an Atmospheroc BOV onto thr car you loose a portion of the metered air. While the minor rich condition will cause little to no harm the lean condition following will cause issues. The lost air will also cause stumbling and potentially thr car to die when let back down to idle. I suspect that the one I installed had a leak in it from the factory already which worsened the conditions shown. But this was as close to an emulation as possible before a hybrid SD tune went onto the car.
Went through the trouble of install/vlog..should of taken it around the block. Don't be a va-geye.
Ima be a Va-geye
So if you get it tuned for the bov it is alright?
tune your car for a bov 😂😂😂😂 fuckin ridiculous
Can you disconnect BOV and not use it?
the car is going to run rich only after the blow off valve opens not on idle or cruising XD unless the spring is set extremely soft
edit: hybrid is best of both world imo
The issue with the BOV is when the car is not produced with it and is paired with a OTS Map or OE tune. As long as the tuner is fine with it and tunes the car with it, the WCU has some idea of what is going on
@@Smeedia I agree letting metered air escape is no good, but a 50/50 bov will not make a car run much worse, just richer as you shift. The stalling and stumbling happen on fully atmospheric bov like the Hks or set to a low spring pressure .
@Smeedia I've been out of the tuning game 12+ years, but at one point HKS made a recirc adapter. Do they not anymore?
@@samuelaudet845 That's actually incorrect. 50/50 Hybrid valves will make the car behave exactly like this. You will have stalling issues, rich A/F mixture issues. I know this because I have a Turbosmart 50/50 hybrid valve, and ended up going back to stock BPV because I got tired of dealing with the stalling, richness and turbo flutter (because of the FMIC).
They still make the recirculating adaptor but its never utilized
Do I need a tune if I went with a Perrin Recirculation valve? Engine, intake and turbo are all stock
No you don't 🙏
So in my understanding here, it is much better to use BVP booba?
Yessir the boomba one is a great one to use as well
You still have a stock turbo inlet and tgv’s? Do you recommend changing those out ? I want to make 350 hp on my 18 sti limited. I have killer b oil pan etc cylinder 4 cooling mod iag aos stage 1 Cobb sf and a full Cobb exhaust with catted dp
Your going to need to swap the fuel system ( Injectors, pump FPR and rails) swap the turbo, and a few other things but your well on the way. I will be swapping to TGV Deletes and changing out the turbo inlet on mine
Smeedia stock turbo is maxed out that quick ?
Yes sir, had to get some clarification from a few tuners but they all said that the OE VF48 wouldn't be able to handle 350WHP reliably
Smeedia that’s disappointing feel like that’s not a huge increase compared to other cars stock turbos. finding out really quick subaru’s ain’t cheap!
Y’all exaggerate, especially the dude that made this video. Jeezus Christ you overdid it
Jesus straight up over did it
Question here….will i pass smog emissions test in California if i put catted downpipe on my Sti? Thanks
If it is a CARB legal downpipe yes you will
@@Smeedia any suggestion on brand or model downpipe for my 2021 STi? the carb legal one.....thanks by the way for answering your viewers questions, you always take the time. wishing you more success on youtube, watching your channel made me decide and buy STi! youre gonna do great things!
Wait so my WRX is stock but the previous owner put a BOV on it, should I take it off?
Thr FA20 WRX responds okay to it, the EJ series a little less so. Personally I wluld replace it back with a BPV if it is not tuned
I got my 15 STi with a turbo smart adjustable bov set to 50/50 recirc & atmospheric
It came with 150,000kms, do you think it would of had to be tuned for the bov to get that kind of mileage?
I can’t get in contact with the previous owner and the place I got it from said it was tuned but I honestly just think they were saying what they think I wanted to hear because I haven’t got any receipts for it.
I get a few pops but only when I really floor it then change gear, other than that I can make the exhaust pop on command every-time I rev match when down shifting but I assumed that’s because I got an axle back muffler delete
I would probably get it in for a tune, just running that BPV/BOV alone won't cause any major harm. But to run optimally I would suggest tuning if you done have any evidence showing thr car had one prior
@@Smeedia okay I’ll be doing that soon then, thank you!, last question I have is would you say 120,000 miles is too high to get tuned?
I’m at 119,000 now
Nope, getting mine tuned here soon with 132K on it 🙌
I got a 2021 STI . It’s possible to use a Boomba BPV on my stock engine?
Yes you can use a BPV, won't cause any issues 🙏
Hey Tanna, it's UK Subie guy. Waw, it's been a long time from this video, & You buying my dream car for the next chapter of the channel. I really like seeing the influence you give out in every video, no matter how hard the next part instal/removal. There are so many Great car covered ytube channels adopting your style & weeding out the fake weekend mechanic. Gracias mi amigo 🇬🇧🤘🤘🤘🤘
Always appreciate the support my friend ❤️
Can you put Both a BPV and a BOV then get it tuned . Would it run good with both of them on there .
I mean you could, but no reason why you should 😅
Can you run a boomba bypass valve on a stock 2021 wrx without a tune?
Yes you can
Hopefully you see this i just picked up a 2021 wrx and was about to get a catback exhaust on it was just wondering if theres any simple way that wont hurt the car to make the turbo any louder?
Oh I see it Luckas 👀 congrats on the car!
Normally with exhausts catless J pipes will give it more sound. But I'd suggest staying catted and just snagging a catback for now 🔥
@@Smeedia alrighty thank you very much i dont know much about these cars yet and dont wanna hurt it tryns make the turbo louder
Come for a subi video. Stayed for the train asmr
🤣🤣🤣🤣🤣
I ve got a 50/50 hybrid BOV on my WRX would that be ok ? The car is running rich sometimes and spitting carbon out of exhaust. Should I take it off ?
Ideally you'd want to keep it at full recirc if your not tuned for the 50/50
@@Smeedia Guess it's not tuned properly, otherwise it wouldnt run that rich. My tail is covered with those black unburnt fuel dirt all the time. should I just get a BPV or just tune it right ?
I have a stock 2010 STI with an hks bov and my car drives perfect.
As long as it is working for ya 🔥
So can you run a BOV on a stock WRX if it’s tuned properly?
If its properly tuned yes
Quick question and note, if I get a GFB Hybrid BOV would I need to get a pro tune to run it with the BOV? The GFB is a hybrid between BPV and BOV and you can change it from BPV to BOV by twisting the head of the unit, you can also run it 50/50. Any ideas on this?
Won't need a tune with 100% recirculation. You'll get little noise, but not worth causing issues to the engine for big 'Psh' noises. I'm getting the GFB Hybrid Bov for my 04 Wrx Wagon, it's Stock except Turboback exhaust (which was tuned for) and STI Downpipe. Once I get it I'll share my experience.
...so what about the HKS SQV4 with recirculation kit?
would it not function like a BPV?
Wait so what about your older BOV video saying it’s not that bad
Its manageable as long as you have a tune to go with it, the main issue stems from OTS Tunes and OEM tunes. If your pro tuned with a BKV on MAF you'll be alright, just need to let the ECU know whats going on with the Air
For the 50th time, tell us why you might not take car out again?
A BOV isn’t going to destroy your engine bro. Relax
Ya totally fkn wrong champ
lol first thing i like is the title. you shouldn't use bov on stock sti he is going to prove to us but his car aint stock. you got front mount intercooler, thats not stock. you have tuned your car, thats not stock. you have many mods on your car. you need to rename this video to why you shouldn't use bov on a modded sti tuned to run rich. i have a bov on a 2019 sti and i have put over 32k km on it and no issues.
The car is still tuned for a MAF set up which would emulate similar problems with the car. Mine may have been extastrabated but still similar. The rich condition thr BOV creates is not so much thr issue, however the lean one following it is.
Smeedia your absolutely far from stock is my point though and just saying that opinions are opinions your and mine but in reality I clicked on your link to see why bov is no good for stock sti and your sti wasn’t stock so your opinion for bovs on stock sti are invalid to me. I have bone stock Sti and I have my opinion to viewers that may be wondering. If you tune your car it will change how your car performs but just bov installation ain’t going to make a big differences there then sound
I dont mean to be annoying, but this doesn't make much sense to me. Installing a Blow Off Valve instead of a Bypass Valve SHOULD NOT RESULT IN THESE EFFECTS. Especially not during idle, where there is no boost pressure in the intake manifold or the entire system. A Blow Off Valve is naturally closed, so should not effect your idle in any way. However, this BOV in the video looks like a HKS SSQV BOV or a knock off. They are a "pull type " BOV instead of most others that are " push types ". The valve gets pulled open by inletmanifold vacuum behind the throttlebody. So my explanation here, it looks like the set screw, (if there was one)or the spring inside, was not set up right or broken and the BOV opened slightly during idle causing a little vacuum leak. Or he forgot to tighten a hose or something but everything in this video screams vacuum leak.
As soon as he got on the pedal, a tiny bit of boost was created closing the valve again, so it was reving fine, but as soon as he let off the gas, so boost was gone and you switch from positive inlet manifold pressure to negative, the engine wanted to stall. That would also explain the knocking when initially stepping on the gas paddle. As for him smelling gas.... no clue. His AFM read a decent ratio, especilly concidering the car was warming up.
But most important of all, he is actually right with what he wanted to say. Installing a BOV on a Turbo car with no Tuning that addresses the BOV or that sits behind the MAF is a bad idea and can cause the problems he addressed. But I have actually installed these BOV on many cars before, mostly Mitsubishi Evos and never had any issues except cars running rich when coming off boost.
So long story short: This guy is completely right in what he says, but I highly doubt that when you put a BOV on your car correctly, it will have any of these effects.
No worries, totally open for corrected information! The video came out a little different than I had invisioned it. I believe the valve was leaking which was causing the idle to jump around. Could have been the seal to the piping or the valve itself which resulted in the funky idle. But appreciated the additional input and clarification!
@@Smeedia Yes, I also think it was probably the valve itself that acted up a bit funny. I am glad I did not come across as preachy or anything, just wanted to give my thoughts on it. I am glad that you did not take it as critisism. And you know what, I love your Subaru and your vids are great, so I'm a subscriber now. Keep up the good work.
Appreciate the support! And my goal for the channel is always to have the correct information presented, qell as correct as I can make them so anytime information is added in am always game to have it Included!