This Is Why You Shouldn't Use a BOV On A Stock WRX/STI

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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[@alexm8406]

Jokes on you I don’t have cats

[@akidd2420]

Read this as I was thinking it🤣🤣🤣🤣🤣

[@noocann]

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.

[@benhurzewoldi8692]

Jesus christ ur good

[@yousefhamed]

You are 100% right a bov shouldnt affect idle unless its leaking

[@jonshuacaceres9828]

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 🤞🏻🤞🏻

[@CarlosMartinezMedina]

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.

[@lecoureurdesbois86]

Or they don't block the recirc hose that goes to the intake after MAF

[@JD-pm6wf]

Hello again! Thanks for the information in this video. I finally got my COBB titanium exhaust with j pipe, intake, and access port for my 2019 STi. Super excited to install this weekend. Thanks for all your videos. Next will be AOS... crazy install for that.

[@Smeedia]

Promise the AOS is not as bad as people make it out to be

[@JD-pm6wf]

I was told that having the j pipe I might need to add a boost control. Said sometimes with the j pipe the boost in 3 and 4th pulls can be too much. So might have to get that installed as well.

[@JD-pm6wf]

Another great video you could do is a very detailed video on how to properly jack up your 2015-2020 Subaru STi. Show all jacking points and where to place jack stands. No one really has a good video for this and some are too short. Just an idea.

[@Smeedia]

Yes I can add that into or make a video on it 😁

[@fixflickss]

I just installed the AEM chargepipe today and realized at the end that those suckers didn't include the recirculation hoses as the AEM relocates the BPV on top of the engine...same situation...car runs way rich with CEL P0170, car stalls when coming to a stop...smell of rotten eggs...waiting on delivery of the hose...thank for the video this clears things up...i swear you da best! And the only youtuber I came across that responds the same day lol....Bless you bro

[@Smeedia]

Hopefully you get it taken care of my man! Small problems will always be the issue 😖

[@bbbbbbbbbbbb27]

Great video! These videos are keeping me from ripping my hair out during this quarantine

[@Smeedia]

Glad that they're helping my friend!

[@MEEDO_]

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.

[@motochris26ify]

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.

[@panderalexander]

Good reply, the poster never replied to this because you mention facts.

[@CallOfBooty13]

Let me know when you start making videos so I can follow you instead. Your comment is common sense, literally entering the chat.

[@carlosquintana9165]

@@panderalexander exactly

[@braydennelson2498]

@Smeedia thanks this was really helpful!

[@MyVideossup]

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!

[@Smeedia]

Glad I can help! Congrats on the car as well!

[@MyVideossup]

@@Smeedia Thanks man appreciate it!!

[@AndresVDJ]

waiting for that fp blue install video !!! i have mines in the box waiting to be installed :) awesome channel keep up the great content tanner!

[@Smeedia]

Jealous I'm impatient and want to have mine 😅 should have it in a few days. Appreciate the support and feedback!

[@Manny_Fr3sh]

Just replaced my FP blue with a dom 2.5 xtr, similar but seems to spool louder and "hit" a little bit harder. Only replaced because mine had a hairline crack that made the car smell like burnt oil. The FP blue looked and felt like a stock turbo which is why I liked it.

[@Smeedia]

Excited to get mine, it will be. A kce bump over the VF48, I was eye balling the 2.5 XTR for a while

[@cassiejvance7496]

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 🇬🇧🤘🤘🤘🤘

[@Smeedia]

Always appreciate the support my friend ❤️

[@jadenw2985]

Now that you mentioned it, you gotta make a video explaining speed density

[@Smeedia]

Thats difficult, ill see what I can do to make it easily understandable 🔥

[@zacharywilburn7253]

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.

[@hahnmowermotorsports179]

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

[@lloydturner48]

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.

[@kurtis_mcewan]

@@Smeedia What about a HKS Super SQV4 Blow Off Valve would still need a full speed density tune?

[@samuelsmith4937]

This actually helped me a TON. Since buying my car it has not had the recirc hose and it has never idled right. Heading out to a place tomorrow to pick one up and see how it runs! Appreciate you!

[@Smeedia]

Should help with the idea issue a lot 😁 glad the video helped!

[@paulmarsdensr1095]

See great information about everything. I'm new to the channel and I'm really impressed with the knowledge but I'm impressed about everyone in the Subaru community doing these videos on our beautiful platform. Keep up the good work brother. Stay safe and have a good week.

[@baileybehzadi2308]

What are your thoughts on the HKS blow off valve with the recirculating kit to make it a bypass valve?

[@sskwan1]

your short trim/ long trim numbers will go crazy. When I had mine vent to atmosphere. When I let off the gas, it does -25 percent for like 1-2 seconds. Btw keep up the good content.

[@Smeedia]

Appreciate the added input! Appreciate the support and much more to come 🔥

[@MrGradeAHaze]

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

[@dynamicgarage4727]

Justin Geier same loool

[@Smeedia]

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.

[@enemen8]

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.

[@Black16STI]

@@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?"

[@mps024]

@@enemen8 no matter what it's not good for the car

[@Ohyaboon]

Great Video! A few years ago I purchased a RFL blow off valve, had it installed with the idea it was a plug and play, I was so wrong. No matter how many washers, ( how it said to adjust ) caused the car to stall at every stop, and turn the tail of my car black from running too rich. To make a long story short, it’s back in the box and sitting in my trunk. I wish I saw your video 3 years ago!

[@Smeedia]

Glad that you got it sorted out, and some cars react different than others from what I've seen most think that BKVs are plug and play but so much more to them than one thinks. Appreciate the added sorry and kind words!

[@popepourri7776]

just installed my hks on my stock wrx today. Keep the videos coming bro

[@Smeedia]

Just make sure to monitor fuel trims and set slring pressure on the BOV to help prevent it from leaking!

[@ralpheezy]

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.

[@Smeedia]

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 🔥

[@perziano6134]

@@Smeedia Is the BOV different when the car has MAP rather then a MAF? 2018 Hyundai Elantra Sport to be exact. thanks

[@christiangoyer]

@@perziano6134MAP and MAF are not interchangeable unfortunately

[@jrod0216]

Thanks for clarification! This is my first Subie, and I have often wondered what would happen if you put a blow off valve on a stock car. As soon as you turned the ignition on I could tell she wasn’t happy at all lol. Thanks for everything you do for the channel!

[@mybrokengoldwing]

Gave the video a thumbs up before it started because I KNEW it was gonna be good!

[@Smeedia]

Eyyyy, appreciate the support 🔥🙌😁

[@tristanmerrill7563]

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

[@MrJames6891]

I like how he "smelt fuel" when afrs were stoich

[@blairmiller3113]

"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

[@BlazeOn88]

Great video. Nice info in there. Can't wait for the disassembly.

[@Smeedia]

Same, so many parts will be everywhere 😅

[@BlazeOn88]

@@Smeedia at least you have a nice shelving unit to 'organize' them. Hopefully it will be controlled chaos.

[@Smeedia]

It will be some type of chaos alright 😅

[@taylorklassen1787]

Love all the content man! Just recently got myself a 17' wrx and these videos are awesome! Lots of great knowledge

[@Smeedia]

Eyyyy, appreciate the support and glad the videos are helping my friend! 🔥😁

[@clintmurdock119]

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).

[@kolyclips3772]

how much you pay for it?

[@jeprodigalson792]

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

[@clintmurdock119]

@@jeprodigalson792 Im at 72k miles now everythings still great. Still no tune.

[@oneSMALLgarage]

Thanks for this video!

[@Smeedia]

Anytime! 🙏🙏🙏

[@Don0van5100]

I recommend using your AP to reset ECU learned values before/ after swapping bovs

[@Smeedia]

The cars not going to be driven for a month and will be returned before driven but not a bad idea, also can let the ECU relearn by driving normally for a bit

[@Don0van5100]

Smeedia yeah 15 minutes is about what it needs to relearn. Your setup was def not happy with the hks bov I’m surprised it affected idle, wouldn’t it be closed at idle I tried to run a GFB fully adjustable bov but it works differently to Evo x oem bov (not sure how) Even though spring pressure and venting is adjustable I didn’t like how it felt or sounded GFB can be set to fully recirc, but still to different to what car is expecting Definitely need to tune for these Aftermarket bovs Check this out, kzbin.info/www/bejne/mKTcapuAnshqmbM

[@Smeedia]

It was odd, if only effected idle under load, if I was strongly and not moving it did not change anything. The cars getting torn apart tomorrow until the pro tune, if I was driving it again soon then I would go through the relearning process. Car def did not enjoy that 😅

[@sheridancowling6257]

What about blocking the BPV so the turbo flutters on a stock or tuned car?

[@SimonPhoenix2022]

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.

[@Smeedia]

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.

[@SimonPhoenix2022]

@@Smeedia it was the first mod I put on my car and I ran it for over a year before getting a protune.

[@Enerix87]

I just bought a side project car and its a used 2013 WRX STI Sedan Sporttech usualy they go for around 17K + I got it for 10K 1.has very small body work to do (only minor rust spots) 2. needs a new paint job 3. The car runs but dosn't run well. Coming from the dealer that I bought it from every time I hit the stop sign or light that choking issue 9:01 happened. I stalled at 3 stop signs.... Got home opened up the hood and the air circlation hose is cut and plugged... stock BOV... So I got on to watch videos on Bypass valves and blow out valves and I want to say thank you! Easy fix just need to get another hose! Thanks for the info @Smeedia

[@DylanMorehouse]

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

[@crystaldaeya012]

If it’s running great than fuck this guy 😂 listen to your car don’t listen to this twit spreading misinformation lmao

[@omgtrey]

Made it to the tuner today! Hopefully I'll get it back this week 😬😬😬 Its been down for 2 months, it was so nice driving it again... even though I had to take it super easy Iol

[@Smeedia]

Mine will be down for a month before getting to drive it again 😫 hopefully all goes well with the tuner!

[@estebangonzalez4224]

Watched your vids... Amazing... Got a 2019 wrx stock, i did put the gfb bov and have it at full recurc. I feel the car jerky at times. Should i go back to stock bpv or upgrade to aftermarket bpv and take the loss. 😬

[@christianrios7037]

So, my 2020 WRX is still stock. I intend to get an accessport or protune after getting the Cobb Big SF intake, EGR/TGV delete as well as an AOS. I know the car comes stock with a BPV and I would love to get a BOV. I’ve heard mixed things between this or an aftermarket BPV as turbo flutter and compression surge are not good for the car. Which do you recommend that would least likely compromise the lifespan of the car? Also, do I need an aftermarket FMIC or do I have to changing any piping before switching to an aftermarket BOV or BPV?

[@redone8341]

This made me proud of choosing the Perrin Bypass :)

[@Smeedia]

Perrin is a good option to use! 🔥😁

[@ytdweller23]

@@Smeedia Excuse me but what's the purpose of replacing a bypass with another bypass?

[@Smeedia]

Spring pressure, the OEM valve can hold around 20lbs of boost but once you start to exceed it you need a stronger valve

[@ytdweller23]

@@Smeedia So it's a must in highly modified turbo engines?

[@Smeedia]

Yessir 🙏

[@Scattmann619]

SO MANY VIDEOS! SO GOOD!

[@Smeedia]

🔥🙌🔥😁 appreciate the support 🙌

[@surrealinabox5220]

Good god that train. 😂 You have been educating me sooo much about Subarus. Gonna lease one soon. At least i know what to do and not do. I feel like more people who are into BOV need to know this or those who are going from a BPV to BOV. To each its own right? Great content.

[@Smeedia]

Exactly, people are totally free to so as the please with their mods, but agreed I at least want people to be aware of the potential issues of using one. And glad the videos are helping my friend!

[@jesusgonzalez516]

Great work and super informative video. Do you think is possible to run a Go Fast Bits GFB for on my 2019 STI. TMS Respons Blow Off Valve BOV Kit

[@Smeedia]

I've used the GFB before and it worked but it leaked also if your wanting to run one with a noise, I would get a 50/50 at minimum to send some air back into the intake track

[@braiyangarcia974]

Dope!! Thanks for actually showing it n seeing what happens.

[@Smeedia]

Figured the best way to present the information would be to actually show it 😁 appreciate the support and feedback!

[@dougl4253]

I have a GFB bov but I believe it set up to recycle back like a bypass valve and it has the tube. It was on the sti before I bought it

[@PhuckyMcPhuck]

Sounds like the good ole Marysville train. I don't miss that.

[@adamswartz7670]

Is that brass fitting a drain line for your AOS?? Remember we talked about that recently.. I got a few cheap amazon catch cans I’m going to test out. Trying to keep the comp AOS on, and not allow the schmoo from going back into my crankcase . Thanks Tanner!

[@Smeedia]

The brass line is the oil pressure sensor relocation kit 😅 need to clean it up when we get going in the engine bay lol let me know how the set up works!

[@adamswartz7670]

Tanner, I bought the hoses to reconnect my filler tank from Subaru, and I’m removing my AOS. My oil is just not lasting long enough running flex fuel. I ordered the radium dual catch can kit, and am going to utilize the intake to pull a vacuum. The oil return line on my AOS, sure didn’t look like fresh oil.. total schmoo yellow goo. Some people said to me it’s normal, and will be burned off.. but I’m gonna try the closed ccv setup with the radium cans.

[@Smeedia]

Let me know how you like it compared to the AOS

[@db2546]

I am brand new to the gas car society, got a 2017 STI and I love the sound of your exhaust. First question, what kind of exhaust and what do I need to run that exhaust like a tuner? I had to have a tuner on my diesel to run a straight pipe. Second question, what do need to do to the engine to install a BPV or BOV. Thank you so much.

[@Smeedia]

The exhaust was a Cobb catted downpipe and an ETS Extreme catback, all you need to run those is an accessport. You can install a BPV without needed to tune but a BOV will require at minimum a protune 🙏

[@db2546]

@@Smeedia thanks brotha I appreciate the feedback!!

[@OzarkOutdoorss]

I have a 2004 sti with forged internals and a flex fuel systems( along with all the other supporting mods) the car is basically fbo besides turbo and headers. And I was wanting a turbo that could get me to around 400whp on 93 and 430whp+ on ethanol. I was wondering if the fp blue could support that on a front mount or even a top mount

[@Smeedia]

Advertised the FP Blue said it was capable of around 475WHP should he capable of hitting your goals!

[@MSRtillery]

Hey Smeedia, love your vids. So a 100% recirculating BOV is perfectly fine, even with OTS tunes?

[@Smeedia]

Thank you! And Yes, and OTS tune is fine to use with a bypass valve 🙏

[@MSRtillery]

@@Smeedia dang, much appreciation for the prompt response. I'm going to pair the Boomba BOV with the Cobb intake and Stage 1+ tune on a 2015 WRX. Again, thanks. Last weekend I installed the IAG AOS, per your recommendation. Can already tell a difference, the car runs more smooth.

[@Smeedia]

Glad to hear! And sounds like it will be a fun set up to daily! 🔥

[@sadler]

@@Smeedia is the Perrin BOV ok as well? i have a Cobb stage 1 tune with Air Filter only no special j pipe or exhuast

[@Smeedia]

Yes it is 🙏

[@edpertimos5329]

hey men i just got a question, im planning on buying DOWNPIPE with catalytic, air intake and a blowoff valve for my sti 2019, and does all of this can just be re map with Cobb accessport v3? or does this build need to be dyno tune?

[@RicciDrums]

Great video - what mod's are needed to comfortably use a BOV?

[@Smeedia]

A remote IAT sensor and the proper tune and you can use them without issue 🙏😁

[@penisenlargement2319]

@@Smeedia whats an IAT sensor

[@hanichiyamamototuong4872]

Thanks for that honest assessment on the blow off valve mate.

[@swishyboi7444]

Nice video bro What if I'm running both SD and MAF running BOV should be good with pro tune? 400whp

[@lance_the_avocado9492]

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?

[@bfunky7517]

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.

[@11Xshadowolf]

Just curious you said "backfire" sorry I am newer to the Tuner world i'm use to carb's and "backfire" is ignition in the intake so is that what happens ? or is it "afterflare" ?

[@jbuckley21]

Good video, thx for the experiment. Curious if you can expand upon the comment that the FP Blue safer for engine? Just in terms of not as much boost or something else? Look forward to the videos and stay safe!!

[@Smeedia]

Will be putting less stress on the turbo, the VF48 would be getting a lot of stress due to the higher HP I will.be shooting for, safer meaning the FP blue will not have to work as hard as the VF48 just reliving some stress off of the car 😁

[@iSmashBoxes]

Can you get a tune for a bov? Or do you recommend bpv instead? Love the stututu noises would love a bov

[@Smeedia]

I would suggest a BPV, but depends on what your tuner is comfortable doing with you car

[@7ate7]

No, you cannot get tuned for a BOV. The only option ig changing the MAF system, to a Speed Density (MAP Based) system. Which, in a relatively stock car, is pointless.

[@wilfk8664]

What kind of camera you using to film? The quality looks really really good

[@Smeedia]

Thank you, I use the Canon EOS R 😁

[@wilfk8664]

@@Smeedia Nice, I am still poor for that hahaha but it makes sense how good it looks

[@artisticvelocityjr7810]

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?

[@ernieghanayem6498]

Hey bro! Any word on speed density explanation? Have a GFB fully adjustable blow off on my STI and my tuner seems to have worked out any “unhappiness” with the motor... just curious what exactly speed density is exactly... thanks in advance! Keep doing what you do bro!

[@Smeedia]

I'm going to put a video together on it, will need to figure out how to do the video but I will make one. And a tuner can work out most of the issues with a BOV from what I've seen

[@BuckingFeast]

Thanks for this vid, was looking at a super nice 04 wrx wagon with 0 rust but it's running a BOV and OTS tune so I guess I'm skipping that buy.

[@DeweyWRX]

Well done sir. Hope a lot of newbies see this video.

[@Smeedia]

Trying to save people from putting a BOV on a car with a OTS or OE tune. Hopefully it helps some 🙏

[@DeweyWRX]

@@Smeedia this is a daily question I get from customers. I'm happy someone made a modern video explaining it. Well done.

[@XBexGone]

Fr I was going to install a BOV that I got from a friend for my wrx 15 with a OTS tune but after this ima return it to him 😞

[@GoddessOfMisfortune]

So I'm curious, would the HKS sqv4 with the recirculation kit be comparable to a BPV in function?

[@itshanrogers8977]

Yes, it turns the bov into a bpv.

[@unsafetadpole3351]

Great vid bro, I’m newbie I got a 2017 wrx stage 2 plus big sf intake 93 oct of a Cobb tune, just bought a Perrin recirculating bov u think I should install it and get it pro tuned? From what i heard recirculating bov doesn’t need tuning thanks bro

[@Smeedia]

You will be fine installing an fully recirculating BOV, performs the same as OEM 😁

[@unsafetadpole3351]

Smeedia good to know bro, woooooooooo!!!!!!!!!🤣

[@lloydturner48]

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.

[@omgitsajedi]

What exhaust do you have on your Subie? It sounds amazing!

[@Smeedia]

At this time it was a Cobb down pipe, killer H header and ETS Extreme 🙏

[@omgitsajedi]

@@Smeedia awesome! I really appreciate it! Great content! I’m looking forward to seeing more!

[@kris_blurry]

Is there a Cobb tune that lets you run a BOV? I’m looking to get one but there’s no videos really explaining how to tune for it just a bunch of people saying don’t do it with a stock tune but obviously there is a way to tune it

[@stephenhaynes603]

glad i saw this video i was going to buy a hks for my hatchback . think i will leave it standard.

[@killeminati173]

I’ve always question this but everyone gives me mixed questions. Thank god you appeared on my TL lol I subscribe!

[@Smeedia]

Appreciate the support and figured the best way would to be able to show what happens for everyone. 🔥😁

[@streetcarmedia]

I had my wrx tuned by my tuner with the gfb response bov it was tuned with it open to atmo before tune ran so bad but I agree it does cause knock and idled so bad now it runs perfect now after tune

[@Smeedia]

As long as you at least pair it with a produce you will be fine, glad that it's running better now! 🔥😁

[@machinesrus9212]

good info man, thanks !

[@kademotycka3716]

Haha I'm new to the subie community so excuse the newbie question haha but what mods would you have to do to the engine to get a bypass valve running good?

[@Smeedia]

No worries! And I am guessing you mean BOV, the car comes from the factory with a bypass valve. But to run a BOV properly you would need to get set up with a speed density tune. It essentially eliminated the MAF and used airflow volume to determine airflow. Its a more complex tuning method and only really used in higher HP applications

[@kademotycka3716]

@@Smeedia oh haha yeah that's what I mean, sweet thanks it's nice to have a KZbinr actually reply to my comments for one haha keep up the great content!

[@Smeedia]

I reply to everyone, your time is just as important as mine!

[@halaxzeus350]

Hey bro i just got a ‘19 wrx and in a nutshell ..... don’t run a blow off valve stock ? And you said if you do , to get a tune? But I thought the Cobb AP was for that ? And if I don’t get a blow off valve what can I run that’s healthier for the motor? Is the hybrid valve better ? Sorry for buggin, I came from a static 96’ LS400 so I’m in a whole new world now with a Subaru lol

[@LymaxVisuals]

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

[@Smeedia]

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

[@LymaxVisuals]

@@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

[@Smeedia]

Nope, getting mine tuned here soon with 132K on it 🙌

[@pab1it05]

Interesting Vid... i was running the same BOV on my 06 STI, didn't tune it... ran it for a month then took it off... on that day that i replaced the recirculating stock unit i blew a piston. Do you think it could have had something to do with the BOV? Also, i see that you have the same STI oil cap on both STI's... does it do anything special? What are plans for the stock turbo that you're taking off? Another weird thing is happening with my rebuilt STI, i was braking in the new pistons so i wasn't taking the revs more than 3k, now that i go over 3k it seems like the car is starving of fuel where it almost feels like its going to shut off, then it comes back at around the 4k mark, but it keeps feeling like its going to shut off intermittently gradually as i accelerate...issue starts around 3rd gear... on the other hand, fuel to mileage ratio has never been better?!? i'm thinking it may either be the fuel pump or injectors i also have a grimspeed fuel management solenoid, when i bought it, it came with an exhaust which i changed back to stock once i rebuild it, never have i run it with the aftermarket exhaust before the rebuild, nor have i run it with the stock exhaust before the rebuild - could i be that the previous owner tuned it to the other exhaust?? Hoping to hear your thoughts. Sorry for all the questions... haha. have a good day, mate.

[@Smeedia]

No worries and it's possible, the ECU may have relearned after the install of thr BOV creating either too lean or too rich of conditions that could have been afreibuted to the issue. The oil cap is honestly just for decor lol 🙏 If there is no adjustment made to the tune the fuleing issue could be related, hard to tell without actually seeing the car 😖

[@oOomadboyoOO]

Thanks for the video because I was about to buy it… Whig kind of dumbvalve I should buy for a stock WRX 2006? Thank you man 👍🏻👍🏻👍🏻

[@jordanwolf95]

Would adding the recirculation adapter hks offers with the super sqv eliminate issues of having a BOV making it essentially a BPV? or would there still be problems compared to having the stock bpv?

[@Smeedia]

It would help to eliminate the issues, it's sending the air back I to the system so its still accounted for

[@danjjr]

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. 👍

[@daviduarte1523]

I have added the HKS on my forestr s-edition and happened the same to me. Tried twice but I was not comfortable using the car that reach and the RPM was not sweet and this subaru is an automatic one. I prefer not taking the risk - but would be nice having the "tchuuuu" noise from the blow off valve.

[@Smeedia]

Don't blame you at all 🙏 if you go to get tuned later on they can make the proper adjustments to allow you to use it

[@Wonderwoody1]

The Ecu does take a little minute to calibrate it...... If you have the accurate back pressure it should be OK. Does make some good or bad depending on you. At super high revs. That's a good thing to monitor. But... Put anything on it.... Go get it tuned. I'm not smart enough but there's always a dude that is 😅 love the vids man.

[@jimhiscott2918]

This is a great video!!!👍

[@Smeedia]

Thank you 🙌🔥

[@jakeselvius6502]

Whenever I google a question, you’re the first video. I appreciate all the help bro!

[@Smeedia]

Glaf the videos are helping my man! 🙏😁

[@channelgreen5949]

Question here….will i pass smog emissions test in California if i put catted downpipe on my Sti? Thanks

[@Smeedia]

If it is a CARB legal downpipe yes you will

[@channelgreen5949]

@@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!

[@rubenduran86]

Well, I have seeing some stock STI graph and everything time you switch gears and go WOT the car is really lean abs then starts running rich as you get in the rpm. Maybe a VOB might not be that bad on a stock tune as you dump some of that air that would have made the initial WOT lean. I don’t know just my two cents

[@mahdiahsansharod9744]

Hi brother, im fan of this page. I have some questions regarding BOV n BPV. I don't have any tuners in my country who can tune my engine for BOV. can you suggest me something that doesnt need a tune and will make BOV noises. I have tried HKS SSQV4 but my engine starts showing mood swings :p Suggest me something please which won't require any tune. My setup is from 2005 ej20y JDM legacy gt. Thanks Love and respect from Bangladesh

[@CaptainHoldenian]

My dream is to do no bpv or bov on a speed density tune just for the turbo flutter and slight weight savings lol. I agree on not using one on maf, but at least you'll shoot some flames!

[@jeffery1909]

Holdenian everybody wants flames lol

[@Smeedia]

My old skyline was like that and the car ran awful, was not set up for it though 😅

[@s1rk0rcracer]

cant wait to see the new snail :)

[@Smeedia]

Same 😍

[@danielmimm795]

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!!

[@UT2K6]

Hi so question I am getting a p0103 code I have already replaced my maf sensor when I punch it I get to about 5k rpm and it feels like my car losses power so would my next step be to replace the wiring or connectors

[@brannonatkinson]

Been running HKS bov on my STI for 30k miles have had no problems but I did have it tuned when I installed that after

[@Smeedia]

Your at least tuned for it, the real issue is stock cars at ones using OTS maps that install it. OTS maps already have their own set of issues but pairing a BOV with an OTS Map and OE map its bound to not have a good time 😅

[@brannonatkinson]

Smeedia ya I remember I put it on without a tune it ran ok but some revving it bright the rpms down to almost stalling the motor it was bad

[@Smeedia]

Thats what I was noticing as well, but it was only under load when it would try to stall out

[@MrJoepeps]

@@brannonatkinson the issue is the bov is staying open when your hitting the limp rpm mode. You have to adjust the bov so it doesn't open easy and closes before you hit limp rpm mode. Gfb dvx has this option.

[@Milkpower2125]

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

[@jacksonramboldt4449]

im in the same boat!!! I want the sounds!!

[@nes3382]

@@jacksonramboldt4449 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

[@jukebox9175]

@@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!

[@nes3382]

@@jukebox9175 100%

[@trevsmoove]

I was hoping you woulda proved yourself wrong. I've been fighting off the urge to do an HKS SSQBOV, since I bought the STi a year, and a half ago. I did the research, and found that would really hurt my ride. I'm not planning on a big HP build. Just a couple of bolt ons, maybe 320...330. Not really sure how much sense speed density tune would make for me. Definitely will dyno soon though.

[@Smeedia]

You wouldn't need a speed density tune at that interval, an intake should give you some solid intake noises should satisfy that want for some noise 😁

[@mattixmatusiak5618]

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

[@JorgeGarcia-pq2xi]

What do i need to do in order to install a bov if i was to really want one

[@bagged_couple_customs1088]

hey man so I've seen some people with older model Subarus make block off plates for the BPV/BOV to create compressor surge, just wondering if you have any insight into this and weather you would say its okay or if you would say don't do it, pros and cons?

[@Smeedia]

It will put more wear on the tubo and mess with your AFRs, the older subarus are pretty forgiving if its something you want to do then you can but aside from the sound there are really no pros to it

[@bagged_couple_customs1088]

@@Smeedia I have a 2017 wrx, would you say its just more beneficial in the long run to just keep everything "stock" and what I mean is just run a bpv and intake? I have the boomba bpv and had the Cobb intake at one time but took it off and sold it regrettably because I thought It was causing my CEL. turned out to be my studs from the j pipe to the turbo outlet had snapped and caused a leak causing the cel. but thanks for the insight and I will definitely make sure not to hurt the car. was just curious and seen it done but hadn't seen anything about the FA20 motors.

[@justinharrison5517]

Do I need a tune if I went with a Perrin Recirculation valve? Engine, intake and turbo are all stock

[@Smeedia]

No you don't 🙏

[@derekvela746]

So you recommend a tune with the bov? I just got a wrx but I want my car to live long and not run any problems. I want a healthy tune and build.

[@Smeedia]

I'd suggest at minimum an Etune so the ecu had somewhat of an idea for what is going on

[@GrandeurBetta]

So when can you get a BOV? What supporting parts do you get?

[@hondaconverter]

so tldr if u want bfbfbfb stututu comfortably you just have to tune for it?

[@kurtis_mcewan]

What about a HKS Super SQV4 Blow Off Valve would still need a full speed density tune?

[@rbeall7527]

Hey, I am currently running intake,catted dp,ebcs, and plan on getting some headers along with hks bov, would I be able to run this bov safely with a speed density tune

[@frankiecastillo7016]

On my 04 wrx with an ej20 I had an hks bov and the car ran fine up til 170,000 miles and the only reason the car died was because it was crashed and totalled. Never had to replace a cat and the car never left me stranded once and I had no idle problems. I did have a turboback exhaust, intake and a ots ecu flash tune. Now with my 2022 wrx I don't need to do it for the sound because the stock bpv makes a lot of whistles and whooshes and some nice turbo flutter by just replacing the intake.

[@jordanhawthorne7636]

So if you get it tuned for the bov it is alright?