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

[@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 🤞🏻🤞🏻

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

[@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

[@dylanboyance3682]

I blew up my 2011 wrx because i added a bov on my cobb OTS map. ran lean and threw a rod

[@alexm8406]

Jokes on you I don’t have cats

[@akidd2420]

Read this as I was thinking it🤣🤣🤣🤣🤣

[@alesana4546]

What do you mean is a bov better for catless

[@alesana4546]

What do you mean are the bov better for catless

[@Tick25]

Same lol

[@marshallmatthews5224]

Same

[@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?

[@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

[@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

[@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.

[@bbehzadi413]

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

[@sssnake2332]

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.

[@sssnake2332]

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 ;(

[@DifferentColt]

@@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 😢

[@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.

[@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

[@blairmiller311]

"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

[@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!

[@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

[@tbas8741]

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.

[@sebastian4383]

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

[@cloudgaming3043]

Why would smell change with a bov install while idling. 🤔

[@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?

[@tristanmerrill7563]

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

[@joshuasilva8073]

Will I be okay if I install a grimspeed bpv on my stock 2020 wrx?

[@Smeedia]

Yes 🤝

[@joshuasilva8073]

@@Smeedia thanks dad I can always rely on you ❤️ 👍🏼

[@joshuasilva8073]

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?

[@Smeedia]

An intake will definitely help you get some of the sound 🙏 turbo inlet will help to increase it as well 🤝

[@joshuasilva8073]

@@Smeedia thanks what would the world do without our subi dad 👨 😢 🙏 ❤️

[@E90_335xi]

I got a 16 sti with the same hks bov and when I rev it the car wants to stall out and I failed nj inspection cuz the evap and oxygen sensor wasn’t ready

[@SGQ12]

So in my understanding here, it is much better to use BVP booba?

[@Smeedia]

Yessir the boomba one is a great one to use as well

[@pejosergioperez1659]

mine got same problem,,,,,on evo2 4g63....rpm drop under idle point and stalling,,.....need recirculate it..

[@Smeedia]

Easy fix though, just to swap them out 🙏

[@pejosergioperez1659]

@@Smeedia most problem.. After boosting or accelerate... Off throttle n put Neutral.. Rpm will drop under idle m stalling.... Afr reading around 10.5.....

[@anotherstar8125]

...so what about the HKS SQV4 with recirculation kit?

[@anotherstar8125]

would it not function like a BPV?

[@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 😖

[@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

[@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!!

[@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.

[@Soobas]

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

[@cybernutjr2]

So having a COBB tune doesn't mitigate the problem?

[@Smeedia]

Like an OTS Tune?

[@cybernutjr2]

@@Smeedia the stage 1 tune that you download with the cobb.

[@Smeedia]

No it will not, I would suggest a pro tune

[@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 🙏

[@rickylah69]

i do wonder is 50/50 bov will keep the richness in check?

[@kurtis_mcewan]

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

[@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

[@Grim-STi]

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

[@Grim-STi]

@@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 🙌

[@gdtbsr3370]

what kind of bolt did you use to block off the iat sensor on the intercooler piping?

[@Smeedia]

It came with one 🙏

[@gdtbsr3370]

@@Smeedia mine didnt come with one 😩 i wonder what size is the plug ?

[@Smeedia]

I think it's 3/8 NPT 🙏

[@RT-xj3of]

So what you’re saying is before I buy an aftermarket BOV, I should do my full exhaust, tune and involve the bov all in one no? I’m bome stock. Just trying to add some pep. Try working for the railroad … trains give me nightmares lol

[@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

[@ilijawankel8759]

What if you just put a block-off plate at the BPV? Except stalling the turbo compressor (and getting a nice stu tu tu sound), will there be any rich/lean conditions?

[@lukequeen3112]

This will decrease the life of your turbo and will increase lag. I would get a blowoff valve that has both recirculating and atmospheric release. You will still get the Pshhh and it won’t mess anything up as long as it is set to 50/50.

[@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

[@jacksonr1337]

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

[@nes3382]

@@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

[@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%

[@luckaskarver9106]

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?

[@Smeedia]

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 🔥

[@luckaskarver9106]

@@Smeedia alrighty thank you very much i dont know much about these cars yet and dont wanna hurt it tryns make the turbo louder

[@sheridancowling6257]

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

[@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!

[@joeplescia2145]

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

[@Smeedia]

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

[@joeplescia2145]

Smeedia stock turbo is maxed out that quick ?

[@Smeedia]

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

[@joeplescia2145]

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!

[@GenFreak.]

the "bypass" valve is a BOV that is recirculated, its not a "bypass valve" its just a BOV that's been designed to recirculate the air back into the system there are also BOV's designed to do both at the same time like the Turbosmart BOV's .. in Australia its illegal to run a BOV Vent to atmosphere..

[@GenFreak.]

kzbin.info/www/bejne/mKTcapuAnshqmbM

[@asaplucifer7866]

I have never had any issues with bov on subarus and I did run a go fast bits bov but still not a problem

[@JoesREX]

How urgent is it that I get it professionally tuned right now I’m running a stage 2 + BIg SF 93 ots I have cold air intake, MA performance J pipe, nameless catback exhaust system

[@hondaconverter]

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

[@shakennotstirred3607]

Can you run a boomba bypass valve on a stock 2021 wrx without a tune?

[@groovyferny9061]

Yes you can

[@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

[@XxCrAzY509xX]

What if you delete the bpv with a bock off plate ? For cool turbo noises ?

[@Smeedia]

Would make cool turbo noises, did that on my old skyline but the car would always stall out

[@chrism1106]

B is for build unplugged the maf and said its now running speed density... does it even work like that? I dont know much at all about it or how to set up a maf'd car to run speed density

[@Smeedia]

I don't know what else was done to the car but no it does not lol you need to have an independent sensor for the car to read off of and a tune to go with it

[@chrism1106]

@@Smeedia that's what I thought. He makes me shake my head more often than not lol

[@artusicam3]

I ran a BOV on a stock STI 2018 and had 0 issues. Currently I’m no longer stock and have a Stage 1 OTS tune and it shows no issues I’m not rich or lean, just yesterday I got a -1.40 knock and -1.40 knock learn

[@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

[@markdavidterrado7727]

Question , for example you get a BOV that is recirculating like the (HKS Recirculating BOV) would you still have the same problem ?

[@Smeedia]

No you would not 🤙

[@markdavidterrado7727]

@@Smeedia SICK!! I was thinking of getting it but was worried that it will hurt my engine

[@jensenliu9457]

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 ?

[@Smeedia]

Ideally you'd want to keep it at full recirc if your not tuned for the 50/50

[@jensenliu9457]

@@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 ?

[@E85_STI]

Hey man so the other day you we were talking about the Barometric pressure sensor but what is the reading supposed to be while the vehicle is on mine is reading 14.36 at idle.

[@Smeedia]

It will be different for everyone, all depends on air pressure for where you are. Altitude is a big factor that plays into it. Mine reads around 14.69. But yours sounds fairly accurate for where you are

[@E85_STI]

@@Smeedia true hey man i forgot to ask ive done tuning soo many times but i feel like a newbie since my pistons cracked but are there any monitors that i can dispaly on the AP that i can check prior to my datalog im almost at 800 miles with my IAG block. I got the AFR and all that. I just checked the baro but i want to make sure the car is healthy and im not missing any sensors that may be oit of tolerance.

[@Smeedia]

Knock, fine knock learn, DAM are the ones I always suggest monitoring 🔥

[@E85_STI]

@@Smeedia yup I got those already

[@Smeedia]

I would stick with those primarily outside of those your choice. Have a video covering what I suggest monitoeting, what values to look for and why to monitor them as well

[@echomike1charlie387]

Hi. Im about to get an AP. Only got cat back exhaust and a aftermarket airfilter for stock airbox. Only goin on stage 1 cobb ots map. Planning to get a boomba bpv. Would that be bad for stock?

[@Smeedia]

Nopw, that should work just fine 😁😁😁

[@jpoltv9708]

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.

[@popepourri7776]

why not just run the recirc adapter and run it into your turbo inlet with the HKS?

[@Smeedia]

Totally fine to do so, but no one ever does it 😅

[@CCGDude]

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

[@brokehondas4520]

A friend of mine has a 2018 WRX and he has an his bov with Cobb tuner access port, he also has an inlet pipe? I’m not a Subaru guy but hoping to get some info to help him out but he explains everything that’s happening with my friends car is it okay to just swap back the original recirculating valve?

[@brokehondas4520]

& also there’s not much information online with the newer model WRX’s as to there’s different sensors?

[@Smeedia]

Yes swapping back to either a OEM BPV or after market BPV will help, as long as the air is recirculated back into the system it will run smoother. The ECU has no idea where the metered air is going so it can freak out, or if his BIV is leaking it will also cause idle issues

[@ricardoescobar2861]

I got a 2021 STI . It’s possible to use a Boomba BPV on my stock engine?

[@Smeedia]

Yes you can use a BPV, won't cause any issues 🙏

[@cassiejvance7496]

Hey Tanner. I did exactly the same with a clone HKS and got same problems. even started making my hill start alarm go off everything I let off the gass. Worst thing it blew my charge pipe off the throttle body and ripped the stability bolt off the intercooler. It must have been holding at least 30 psi to do that. Put my stock recirculation back on and all problems went away

[@Smeedia]

Holy hell, was this with the KE Turbo or a larger one?!

[@cassiejvance7496]

@@Smeedia no, this was,, as far as I know, my total stock everything wrx uk. I've done nothing but go full catless with a japspeed 2.75 turbo back, with a 4 pipe Sti style rear muffler that's been cut open and all the crap removed. That's it

[@calebroper4826]

Okay, so no matter what you are running the car is tuned for that part right? If you are running a BPV the car is tuned FOR a BPV in which case the car isn’t happy when you takeoff the BPV and put on a BOV. I don’t know if I’m understanding this correctly, but if you have your car tuned while it has a BOV then it will be fine right? You just don’t want the car tuned for a part it doesn’t have

[@Smeedia]

To an extant you will be alright the major issue that I was teying ti get across is using a BOV on a OEM or OTS tune (one that is not intended for a BOV) Will cause issues

[@barrykoob5477]

Not sure if asked but why not just run the hks in recirc

[@Smeedia]

You can run it full recirculation and it will be okay 🙏

[@jordanhawthorne7636]

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

[@swishyboi7444]

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

[@PuertoRicanThor]

So I actually did exactly this. I installed the HKS BOV for a day and then I just put back the Cobb BPV. However, the rough idle happens now and again... does it take the ECU a bit to read normal idle again?

[@Smeedia]

The ECU will have to re learn once you swap the valves, you can either reset ECU learning or you can drive the car around as normal for a bit to get the ECU to relearn

[@giovannimateo-ramos1406]

Would a boomba bpv be bad for my stock wrx ?😭

[@Smeedia]

Should be totally fine 🙏

[@imletinhuynh]

What about a recirculating blow off valve? Is that safe on a stock wrx (base)

[@Smeedia]

As long as it recers back into the i take track, you shouldn't have an issue 🔥🙏

[@NorthofNiflheim]

Wait so what about your older BOV video saying it’s not that bad

[@Smeedia]

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

[@2Razor7]

Doesn't the Cobb bpv make the splush sound??

[@Smeedia]

The intake does, I've never really heard any audible noise from it before

[@genadinecariaga810]

Can you disconnect BOV and not use it?

[@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" ?

[@johnsullivan937]

You were saying cars with a MAF shouldnt have a bov right? I've got a genesis coupe and it has a MAP, seems to run perfectly fine with a RFL bov, full bolt ons and a reflash tune, I remember doing a bunch of research beforehand and the consensus was it seemed fine, but I guess my ocd has me compulsively checking random things on the internet again to make sure I'm not damaging the car lol

[@GrandeurBetta]

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

[@liamdrysdale4473]

Hi man. Ive got a block off plate for my stock bypass valve on my 08 hatchback. So it makes turbo flutter, compressor surge whatever you want to call it. My car seems to idle and drive completely fine although I dont have an Accessport so i cant monitor knock etc. I know its running slightly more rich due to the few extra pops on downshifts but apart from that it seems to drive fine. Any reccomendations? I know I should probably take it off but that stustustu is addicting.

[@Smeedia]

From a performance standpoint I would remove it, but if you want it and you haven't had issues, its you can so if you like it keep it going.

[@liamdrysdale4473]

@@Smeedia Good video idea maybe? Hahahaha. Just a metal plate you put behind the recirc valve between the valve and the intercooler. I'll keep it out for now and see if I notice any differences, thanks man.

[@j.armando1852]

Is a go fast bit response blow off valve bad? I have it about 25% open But I wanna hear what u gotta day Supposedly it’s a recirculating bov Should I have it closed all the way?

[@Smeedia]

Ideally yes it should be closed. I used one a few years ago and had it about 30% open and never had an issue. You should be okay

[@buudasubuwu]

I'm running a cobb stage 1+ tune on my 21wrx ,could I possibly put a hks bov on if it's recirculating?

[@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.

[@Makeeverydaycount24]

I've seen that happen when the spring preload on the bov isn't correct spending on the valve you're running.. It doesn't shut quick enough therefore rough idle.. I've seen it, I've had it happen. Apart from the spring issue... Never had an issue and have had 2 different wrxs and currently 2018 sti.

[@cal63look]

Not a problem with an HKS bov by its design..HKS use a different design

[@Makeeverydaycount24]

@@cal63look yes that is correct... I probably should of mentioned just the adjustable ones... More the cheaper ones... I had one work fine then got stuck open while putting my foot down.. Haven't had any actual big problem running one though with or without tuning on 3 different wrxs and 1 sti.

[@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.

[@GoodBoysMTB]

What do you think about the Turbosmart dual port BOV? On a 18 STI.

[@Smeedia]

Looks like a 50/50 valve, I would still suggest sticking with a BPV but if you want the noises a 50/50 would be better than a full VTA

[@GoodBoysMTB]

Smeedia my tuner recommended it since I’m going stage 3 plus flex fuel. He said to get it now if I want to upgrade my turbo later down the road. Still unsure if I should pull the trigger on it or not.

[@Smeedia]

I would listen to your tuner, I'm swapping to an FP Blue and going E85 with a hybrid SD tune and I was told to stay with the bypass valve because I am still using the MAF

[@GoodBoysMTB]

Smeedia okay makes sense. Thanks for the input. Great video btw!

[@somith2329]

Dont use full vent to atmosphere like hks or greddy use a gfb or turbosmart adjustable bov.

[@jeffery1909]

What if we have one, but the car is tuned? Also with a burble tune.

[@Smeedia]

I would suggest getting off the burble tune and swap back to a BPV, the bubble tune pushed extra fuel through the system as the BOV would my guess is that your car is running very very rich

[@AustinKloud]

Washington State resident - Type RA owner, so you think the bpv is the way to go?

[@Smeedia]

Yes I do, shouldn't need a BOV unless your full speed density or making higher HP. You can Run a BOV if you want to just make sure you get protuned with it on. Would highly advise against using it with an OTS Tune.

[@alldatwhooblah6868]

If you put an aftermarket bypass valve on a stock STI would you hear any noises?

[@DJmanila]

Question? I have a 16 wrx and just had invidia R400 installed. Is it OK to install bov ? If so, would it be safe to go with turbosmart hybrid bov? I don't have an accessport.

[@Smeedia]

No, a BOV should only be used with a speed density tune. Highly auggest using a bypass valve

[@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

[@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!!

[@Jaydomize7]

I have the perrin recirculator bov is this bad to run this on a stage1+ Cobb tune? The previous owner had it on there just wondering if I should take it out and swap it with the oem one?

[@Smeedia]

You should be fine, theyre both recir valves so won't make a difference 🔥😁

[@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

[@typical8th]

i have the hybrid one but its not going in the car until i have all my parts for stage 3. any thoughts?

[@Smeedia]

I've used the hybrid in the past and the car ran alright ideally wait until the produce but if you wanted to youd most Lilley be alright

[@typical8th]

Smeedia yea thats what im gonna do. im literally just gonna sit here n wait till i get all my parts ready for stage 3 then thats where im gonna install everything

[@johnreyes7209]

i just did the 93 oct map, just ordered from MAperformance downpipe w/ intake combo comes with a stage 2 map , wanted to ask if i can install the HKS bov , i know a few people with a bov on a stock sti , but their cars run normal no fine knock

[@Smeedia]

The ECU can make some adjustments to compensate for it but theose OTS tunes done always communicate well with a BOV, also keep an eye on that OTS Tune, seen a handful of cars with awful readings from that tune

[@johnreyes7209]

Smeedia oh ok , yea im on the 93 ots map its nothing crazy just untill i install the MAperformance stage 2 map. so i should be good with the hks bov? thanks alot man

[@johnreyes7209]

Smeedia i wont have it on a ots map when i install the BOV tho, i was planning to install the BOV after i installed the stage 2 map with the intake & downpipe

[@Smeedia]

Just keep an eye on thr AP, if values really start dropping i would pull ot off. If everything looks okay you should be fine to keep running it

[@johnreyes7209]

Smeedia just got the car few months ago , dnt know how to read it TOO good yet lol, maybe its smarter to not even install a bov if ima do all tht other stuff right? dnt want to ruin the car either lol for a sound

[@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.

[@Chabot1801]

You installed a atmosphérique bov when hybrid ajustable bov exist. Would be cool if you mentioned it.

[@Smeedia]

I've touched on thrm, depending in thr brand they seem to be very hit or miss with leaking or sealing

[@dylanc6585]

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

[@OFFICIALRAPTORTHERAPPER]

Is it possible to have a tune for a bov??

[@OFFICIALRAPTORTHERAPPER]

Well you answered that 3/4 of the way lol

[@Smeedia]

Lol a tune will mitigate pretty much all of the issues