Flutter all the way!!! Great comparison, so many people demonize no BOV like "you're gonna blow the turbo instantly", but you weren't biased, thanks for that.

I did oil analysis after running BOV vs no BOV on a journal bearing turbo and saw copper wear levels after the no BOV and return to normal after running the BOV again. I'd be concerned about the axial wear on bearings if you're on a journal bearing turbo, if you're running a ball bearing turbo, I believe the bearings are more tolerant to axial forces. Otherwise have fun with the cool flutter! Now, I will mention this is on a 480whp STI running about 28 psi on speed density. On lower boost applications it's not going to affect it as much.

I have an atmospheric diverter valve and i get the BOV sound at certain rpms and a flutter at other rpms, best of both worlds sound wise.

sweet video. “blow off valve” was said 358 times

Good explanation! I weld, fab and tune right out of my home garage, I cannot stress this stuff enough to "car guys" with big egos. They always think what Joe Schmoe said on a forum 20 years ago is total truth. I'll start using this video for them. I ran without one for quite some time, loved the flutter and it was tuned for it. Added a TurboXS RFL for a change up. Beyond noises, I did have issues with high boost and couplers coming off without the BOV, but that was only a couple van-gen clamps of a problem. Great video!

I rarely ever like videos, but this was exactly what I was looking for, appreciate the video👍 I swapped from 1 50mm BOV to 2 forge diverters & haven’t done the vacuum lines for them yet, I like this because you showed what it does without vacuum to the BOV & justified my decrease in boost pressure for now👍

How are you not at a million subscribers. I havnt been here since the beginning but I’ve been here since 10k and I’m amazed at how much your video quality has increased. Your awesome please keep at it

Thanks for explaining what a BOV does and how it works

I’ve been running mine with blow off valve disconnected for around 6 months. Haven’t noticed any leakage out of the flyin Miata/turbo smart bov with just line disconnected

it sounds so cool without the vacuum line disconnected

I ran a BOV on my 93 XR-2 (a front wheel drive MX-5) and I had no problems. That car had the old school barn door MAF and I had no problems.

I really like both sounds, but I think I'd pick w/BOV hissing/breath sounds over flutter personally.

Have no bov on my car and it loves it sounds so good, been playing with some different length intake tubes to tune the flutter sound 🙃

Hey. I have almost identical surge sound as you when you have no vacuum line connected. Only problem is, I don't have a BOV. I'm on diesel, so only wastegate. It doesn't happen every time, but there are periods when almost full ride is stututuing or long scraping. Could it be that my wastegate has vacuum leak, since is not constant?

Great explanations.

Great video. Very informative 🤙

Love the video. Building a twin turbo 347 in my mustang and still learning alot as this is my first turbo build. Thanks man.

The information provided about everything with a bov on is correct, however some of the information with the BOV disconnected is just a bit off and car specific. Id recommend revisiting or relooking into this with a different style bov or possibly a more modern vehicle.

So I have a Honda accord with a k24z3 I plan on throwing a turbo on it and I want the no bov option for the louder turbo noises what would I need to not blow the turbo and keep it reliable or is there no diffrence just don’t run a bov ?

Honest question! A urgent matter is at task in a few days I’m going stage 3 on Audi s3 with ots tune is it cool if I use a blow off valve ? Or it is dangerous

What if my car has a Stock Diverter Valve, but I just disconnect the hose so it releases to the atmosphere ? My car is a 2016 Veloster Turbo

New to your channel mate! You have explained so well with perfect examples! I was mad in love with hissing sound of turbos, during my childhood I watched Hotwheels aes driving with that swet decent hissing sound..since then I am a praiser of hissings!! No offense my stutu sounds like rats under the hood! Ugly sound... I enjoyed your video...subsed too! Keep up the work mate!

So question. I have a 2016 Audi A3 2.0 that originally came with a diverter valve. I switched it out for a TurboSmart 50/50 Bov. Will that make the car run rich, or is it perfectly fine?

My friends wanted me to get one for my Audi A3 but I found out the recirculatory valve it has factory is actually better and will make my turbo last longer so no blow off valve for me 😅

BOV sounds sick

Why your BOV leaking boost when vacuum line is disconnected? The pressure should be holding that BOV closed. Did you not plug the disconnected vaccum line? I'm also using an hks SQV4, I'm not losing boost when my vacuum line to the BOV is disconnected.

Great info thank you

how can in intake be more air near the maf when having a blow off, this doesnt make sense to me

Building a boosted RHD Accord wagon!! Thinking flutter for me 😊

How do u feel about putting a blow off valve on a CX9?

i do not have a car

Hey man is that thing one of those 40psi 79whp inline 2 cylinder that rev 15k rpms? Things are mean buggers, you know like those Hondas.

I have a Kia Forte gt 2020. Still OEM with the BOV and turbo but I will like to hear the turbo also but also the BOV. Right know I just hear the BOV

does this reduce the turbo lag?

Question: do diesel engines have blow off valve? I mean they dont have throttle plates. But i do here trucks make the blow off valve release sound between gear changes. But i dont here it in SUVs or small diesel engines.

I have a touran 1.4 Tsi 140 hp and my turbo was broken, should i use a bow off valve or not , and which one you suggest

I like the mx5 bro nice one, now make it a drift build

Well guess I am going no BOV This summer for the Miata. Thanks lol

But doesn't the recirculating air pressure escape out the intake filter past the MAF anyways.

the issue with my car is it idles at 2k rpm’s. do you think this could be the issue? i have a BOV and it flutters like there isn’t a bov.

A BOV can be "tuned" to open half way so there's both a little tss and flutter right?

Nice video, I would like to understand if a valve with recirculation or one that discharges into the atmosphere is preferable to have the maximum performance from the engine, clearly tuning the ecu correctly and if there would be a way to have the valve discharging externally with a map for track use and bypass to another recirculation for use on the road. Thank you

I've always ran compressor surge on my drift car.

Not running a blowoff valve won't damage your turbo in any way shape or form. Building boost with a closed throttle body will ruin your turbo however, this is the same with or without a bov.

Cool video. I have a BOV on my FD, but don't have it plumbed in as I love the flutter. The car isn't used a great deal, so turbo life expectancy isn't a high worry for me.

Link to the bov?

Anyone know that this dude talks ALOT with his hands? Lol! Very good video & very well explained in detail.

Is it normal for a blow off valve to make that whoosh sound when just taking off slowly or driving normally? It doesnt work every time i boost i can just hear the turbo flutter. Does that mean the blow off valve is broken?

whats difference blow off and wastegate?

Where do i get this blow off

That little pod on your valve cover might be messing with things. When I put one on my car ran rough

I got a 2015 sonata 2.0t automatic that I have a blowoff valve but not getting the flutter

Im driving a lexus is200 turbo on 0.7 bars of boost and running NO BOV, no issues whatsoever (with the turbo :D)

ftssss vs stutututu

Nice video, man! Wow, the blow-off valve you have is just as meaty sounding as the one on my old '05 Legacy GT! Sounds awesome! How much boost pressure are you running?

Quick question Dump valve = blow off valve ? And I thought BOV made a stutututu sound?

How you finding the eBay special BOV? Any issues with it? Keep up the good work! Cheers

mini cooper S F series make turbo flutter sound all the time, it does not have diverter valve or BOV from the factory.

You have a gaurdian design wheel too??

Question, what about yes to the BOV & no to a waste gate?

Diesels run no bov, do to no throttle plate to close. And also run 20-30 psi factory depending on the make and model. The issue that comes from compressor purge is it wears out the thrust bearing. Thats the bearing keep the rotating assembly in the center of the turbo. Just like the crankshaft thrust bearing. The reason it wears it out is the imbalance between boost and drive pressure. It'll live just not as long.

I like the BOV sound more than the fluttering.

Wow! If I had to choose between that BOV or no blow off valve, I'd definitely chance my reliability and never purchase whatever you did. If you "pssh" for more than 2 seconds than you're just playing with it. Flutter all day.

Have all the parts and am building a 30k mile 1997 Import Honda Integra sedan type r B18C engine/tranny with a go auto works turbo kit no BOV flange and a GTX3071R aiming for 400hp can’t wait to hear it flutter

sound is science

What about VW and their Diverter Valve? How Does that Work

I drive a 10th gen Civic 1.5 turbo with recirculating bov from the factory. Do you think running a vent to air bov will run rich and do harm the engine in the future? I was reading forums and some says yes some says they’re running those kind of bov with no issues. Appreciate for the answers. More power to your channel dude.

I don't even have a car but cool video though xD

My inner child is screaming BWAPPPP BWAAAAAAPPPP BWAAAAAAAAAPPPPPPPP

good video, I just want to sneak in quick a couple small things. the new VW MK7s don't have diverter valve on the Jetta S models, but they do have small boost pipes that run from the charge pipe, and manifold and pump them back into the turbo inlet for boost pressure relief ( to an extent ) I built my own charge pipe with a Turbo smart duel port valve and its been great, far faster spool up, but a small lag between shifts. setting up an adjustable BOV is key to a good running engine, and turbo response time. also one last thing, not running BOV isn't totally bad for the turbo, yes it can cause damage to the compressor but the sound you're actually hearing is the hair breaking surface tension from the compressor blades themselves. but yes, any turbo vehicle should run a BOV, and or a plumb back valve for longer service life of the turbo, and engine. but a again, good video, and its nice to watch a video with good audio.

Great information, just which I had a car like that

This really makes me curious how the turbo can “blow off” during free revving. I also have a turbo 1.6, and it never does it. I wonder if the turbo is too big (t3) and it just doesn’t spool enough for there to be an audible noise.

If u thought about it you could have capped the bov with a rubber line and a screw ;)

1:28 its only for gasoline engines, not diesel :)

bov or bust imo, that pssssh sound just sparks a special neuron in my brain

What is your turbo name ?

I’m trying to make my Jaguar e-pace faster but also make the bov sound we love. Any comments

You know how lots of cars pump fake engine sound into the cabin now? I wonder how one would go about micing up your own intake and pipe that into your cabin for that little extra sound clarity

depends if you worried about turbo lifespan

Why go too all the trouble putting boost in just then it’s gone wasted / Might as well balance lighten parts bigger ITB or better tyres

I just don't have a TIG welder to weld my BOV flange to my intake pipe. Single 98/88 cheap turbo on a gen 4 5.3 with forged pistons. The flutter it makes sounds awesome, but I don't want to damage my turbo. I made a new friend a few days ago, who has a working TIG setup and offered to weld it. I will be doing that. I have a TIG welder, but the welding gas shops won't fill my gas bottle with 100% argon since it's already had 75/25 argon/CO2. Bottles are expensive. $300+ for a new, empty bottle. Bleh

Always wondered how the older 90s audis didn't use them on their turbo cars.

Just so everyone knows, they make turbo for this application. It’s the ones with all the fancy holes around the turbo inlet side. Those control flutter for non BOV applications. However most modern day cars have internal wastegate s now and there is no need for a bov as the exhaust pressure is regulated to in tern regulate boost pressure.

With BOV Sounds cooler and we can’t argue

The best option is a recirc valve.

good explanation. I'm running a diverter valve iso a Bov. Works good and makes less noise

The disc's are rubbing not only because they're under pressure.

I didn't realize without-BOV has become a thing, one doesn't care the unnecessary wear on the bearings and the longevity of a turbo, would've at least concerned the massive amount of pressurized air piped into the opposite direction of a highspeed spinning turbine to literally force it to a halt. Who wants to wait for the turbos to spin up from a halt all over again between every shift?

And now for the no blow off valve comparison = $$$$$$$

Bov for reliability

I don't want flutter. It sounds basic and annoying and I'd just prefer a BOV at that point (especially a loud one like a turbosmart RFL. No, what I really want is that CHOOOOOOO-CHOOCHOOCHOOCHOOCHOO when I let off the throttle like in those stereotypical Skyline and Supra clips.

my 22 civic si has a BOV and it’s kind of a shitty OEM one but it sounds great. I want to run a waste gate when warranty is up

I run turbo engine it had recirculation to the air intake but I have seen remove that so it vents to atmosphere is safe for long term use

This is an old car with obsolete turbocharger technology. Modern forced induction engines are based on variable-geometry turbocharger where BOV is completely redundant.

install turbo behind throttle body and then you do not need bov

Air doesn't go back through the turbo without a BOV. Its a common misconception. The turbo is operating at hundreds of thousands of RPMs and the air can't force the turbo to start having negative RPMs and allow it to flow backwards. Compressor surge occurs because the air pressure in the intake tract becomes so high that the compressor physically can't compress the air anymore. Instead of compressing, the air at the turbo detaches from the blades of the compressor causes the stutter sound.

Zuuuuuuuu Stututututu~

It's time for alignement to set the steering wheel straight. So annoying and it's not even my own car😉😇

4:59 angry horse

I'm sorry but that fucking bov sounds so good ugh shhhhhhhhhh