LOUD BOV on a Supercharger EXPLAINED!

In this video we discuss LOUD blow off valves BOV on a supercharger and why it is annoying to have a loud one on a street application. The loud hissing sound is constant on a supercharged setup and will quickly become annoying listening to the loud HISS sound while cruising.

[@Riveraharry75]

Great video. Perfectly explained.👍🏽👍🏽👍🏽

[@wavyybased1820]

Man I could listen to a loud blowoff valve all day long my man.

[@BoostedMotorsports]

Except for when its constantly hissing and sounds like a boost leak on a supercharged vehicle 😂

[@Mcfly0856]

You say that now but it gets old quick...

[@jamespuckett1770]

I can to but supercharger BOVs give a constant hiss while not on the gas whereas turbos dont do that because of the mechanical differences in how they operate and its extremely irritating trust and believe

[@chester82gtstang]

I had a paxton BOV that whistled and it sounded AWESOME but it got old REAL fast.

[@Mr_DiEnd]

For someone who just started learning about engines and stuff I gotta say your video is super duper easy to understand than most. thank you so much for your explanation! subscribed!

[@JohnnyCTSV]

My Zo6 is so flipping loud because of my exhaust anyway. And my blower is noisy too. I’m gonna add a louder BOV to add to the horsepower orchestra 😂.

[@kerimkocak9447]

WOW I am amazed I always loved supercharger but the noise of the blow-off valve made me lean more towards turbo. I did not even imagine a pov on superchargers. Your video is awesome and explains adequately the pros and cons. Thank you so much for this educative video.

[@jeffgood6441]

Yea two bovs and a 5th gen eaton m45 sound pretty wicked paired together on a lil 2.0 liter

[@elvilx3262]

Tbh the hiss doesn't bother me. Just a reminded of how fast your vehicle is >:}

[@Danny-ow7hl]

OMG. Dude! I was wondering if that was normal. Thanks so much for clarifying that. When I was cruising around, all I would hear is the "hissing sound". I thought I was going to break something.

[@BoostedMotorsports]

No worries Jose! Glad you found the explanation helpful! 👍👍👍

[@PiterStreak]

Yup. Experiencing this with a centirfugal supercharger set up on my honda. It's fun for a little then it gets annoying. The other way to remedy this is by running 2 blown off valves. That way, instead of one diverting , say 10 units of air and being loud af, 2 can divert that same air but at 5 units each drastically cutting down the sound however you have to spend on yet another BOV

[@Mizzle07]

I have the same Tial Q BOV on my HKS Supercharged S2000. (Similar to a pro charger) Between 3-4000 RPM’s cruising has a loud ass whistle! It was cool at first but it’s just deafening at this point. I’m gonna change it to a Tial QR today to get rid of that loud banshee scream. Thanks for making this video.

[@tropicalshadetinting8224]

Video was so well explained. Great job! Thanks!

[@albertomartinez2855]

As always, great video, great content. My solution to all annoying sounds, turn up the volume

[@anthony.martinezmartinez2923]

Always enjoy your videos

[@MiGujack3]

Thank you for the explanation.

[@Nashness]

TiAL actually makes a "2psi spring for supercharged applications" that I believe eliminates this issue.

[@driftx2]

Wrong, a lower PSI spring makes it louder.

[@muhammadamirhasyim3460]

Great explanation 👍

[@MrMarkpark]

Good job I run a blow off valve with a novi 2000 on my 97 cobra. I’m using a blow through meter so I don’t need to recycle the air. Same deal loud as hell when cruising. It makes 21lbs of boost, so when you lay into it then back off it sounds awesome. It sounds like a blow off valve to the tenth power. I realized that the supercharger is always spinning, The thing that you brought up is; its always spinning even when you are not using it. Even when decelerating. So yes, it’s always blowing which gets annoying. It sounds like an airplane. I’m tempted to put the bypass valve back on but then no whoosh sound ever. To whoosh or not to whoosh. That is the question. It’s a toss up.

[@BoostedMotorsports]

Yeah exactly! Love the sound when you are on it but when just cruising or trying to drive normal its constantly hissing loud AF lol

[@jadz684z]

I missread novi for nokia (idk how) and was like well that phone was awsome

[@sariahreigns3666]

@@BoostedMotorsports stupid question but my deisel buddy came up with an idea to use a deisel electric turbo blowoff valve any thoughts or possibilities on it? It would keep it closed on cruise but when completely off the gas open a bit and not wide open.

[@qrs3658]

Thanks for this good video. btw what brand BOV is this one?

[@FroztiProductions]

So I should re-route the outlet of the BOV to the intake to turn it into a diverter/bypass? I actually have a turbo and was curious how much that helps with lag, even if turbos don't have the problem you're mentioning.

[@horsepoweraddiction808]

blow off valve can also be routed to recirculate also most good bov can be adjusted between harder and softer so that leaking boost pressure doesn’t happen

[@markroadking]

So, I have a P1SC procharger, using the BOV supplied with their kit and it is set up for 12# boost. I have about 120 miles on the 331 SBC with blow through carb- I have yet to hear the hissing sound of the BOV.... would like to know if there is a problem. Thanks- Nice video btw.

[@HARLEM430]

Great video

[@jakskelington666]

WELL DONE!

[@hikarisakishima6982]

My Tial blow off valve was having trouble releasing pressure and would make a clicking noise every time it opened. I switched to a 3psi supercharger spring and it helped with releasing the pressure more consistently, but it still make a loud click sound when it opens. Did you experience this with your Bov?

[@nicaragua5057]

Good video my friend

[@BoostedMotorsports]

Thank you! 👍

[@audimanvideos153]

Awesome video 🍺👍🏻🙏🏻 is it ok to us on Audi A7?

[@karlbigmore7949]

Thanks for the info fitting supercharger and did not fit valve will get one b4 a start

[@user-dd2wo5oi2y]

Hey. I installed a supercharger on the 370 z. And I suffer from this noise in my vehicle that came with this bov. Would I be happy if you could tell me which model you recommend instead, which can be the quietest?

[@CarbonLexus]

I’ve seen a BOV that dose both recirculating and a slight Stu tu tu tu. You can adjust it to your liking I’ll have to look at what brand it was but it looked cool.

[@markhowson3582]

just for some fun im fitting a AMR500 Supercharger to a 1500cc pre crossflow ford cortina engine can i just cut or stretch the spring to reliese when i want it

[@1moderntalking1]

Would I still need one for automatic cvt transmission at 7psi?

[@StyleOverPolitics]

Hey bro on your supercharger do yoh have the standard gear set or the quiet gear set?

[@patrickchristison2216]

What about a clutched supercharger? Is the bov gonna be closed while cruising or same situation?

[@yolofullsend]

Put a heavier spring in the bov.. it's usually vacuum that opens it anyways.. on my bov there is a screw adjustment on the top that let's you not run into this issue.

[@yoshiz3396]

a stiffer spring will help to load more boost ?

[@hoonage5]

@@yoshiz3396 you cant put a heavy spring in the BOV on a supercharger. The BOV has to be open on light vacuum

[@PM_Anthony_Albanese]

You can't just "put a heavier spring in the bov or tighten the adjustment screw down so it doesn't leak" on a supercharger setup. If there's nowhere for excess belt-driven boost to go during partial throttle or no-throttle+high revs, you'll blow the intake piping off. Stop thinking that superchargers work like turbos. They don't. They are belt driven, making boost even when you don't need it. If you "tighten down" a bov in this case, where is that 3psi of pressure in the intake going to go while your foot is barely or not on the throttle during light cruising or downhill engine braking? It's going to blow the charge pipes off if it can't vent because you stupidily put a bov on there and tightened the adjustment down. Re watch his video. He is trying to explain this to you, but you cavemen are like "Derr... Just tighten dat bov down..."

[@jamiegarrison4746]

Can this issue be fixed by a stiffer spring or stacking spring to keep it closed?

[@AtticAZ]

The stock Procharger BPV.... are you talking about the bullet or the Proflow? Bullet has piston, ProFlow has a butterfly valve, like a throttle body.

[@valiantredneck]

Interesting topic. Thank you.🇨🇦

[@luiiiiiiiiiiiiighgh7]

I have the exact same one on my supercharger vortech on a srt8 Charger and it doesn’t open enough unless I absolutely floor it hard. Should I tune the car? Change the spring? I want more sound out of it

[@BoostedMotorsports]

Yeah sounds like the spring you have is too stiff. You usually need to put a softer spring in for supercharger applications. Also make sure your vacuum line is connected and working properly 👍

[@alexquek92]

Attached a hose from the blow off valve to the oil cooler , cooling down oil temperature while cruising the speed 😂

[@shawnwilliams1446]

Change the spring i have a tial 50mm and a bypass valve works great and does sound like a jet ysi blower

[@jimbrow83]

Why did you do it in the first place?

[@afrakes4510]

informative, but so little content. you keep repeating the same info.

[@TheTexasjsz24]

I bought this bov just for this reason. I drive a jeep on 40s. Noise is the least of my concern haha.

[@Mcfly0856]

I tried the Tial bov with my Procharged F-150 and experienced the same thing, sounds like a street sweeper coming down the road.

[@Nashness]

Did you put the supercharger spring in it or did you leave the default spring in the TiAL? It comes with a 2psi spring for this very reason.

[@Mcfly0856]

@@Nashness Yeah, I bought it with the 2lb spring. It was fun for a few weeks, but then it starts to get annoying...

[@Tewthpaste]

*i want my car to sound like a jet engine i want an even bigger and louder BOV.*

[@monsterram6617]

Seems like the diverter valve is a better design for your application.

[@coreyparker9177]

Why carnt you adjust the BOV??? It should be adjustable with a dial on the top saying hard or soft, therefore eliminating the hising under low rpm driving !

[@supras7]

When you're explaining the loud pshhhh noise while cruising my tial bov on my supercharged z34 mine sounds like it's surging , more of a shh shh shshh shh noise. What should I do?

[@BoostedMotorsports]

Not much you can do on a supercharged vehicle except get a diverter valve and send it back into the intake if you don't want to listen to the hissing. Different BOV will change the sound but regardless it needs to get rid of the excess air somewhere

[@supras7]

@@BoostedMotorsports ya the. Constant boost at 3k is a bit annoying sounds like a train chu chi chi chi chi

[@TunedRAMS]

Do you have a D1 or F1 head unit?

[@BoostedMotorsports]

D1SC 👍

[@firstchancetryingboy4198]

Nice video with some good info can I take off my bypass valve and put on a bov on my roterex supercharged?

[@BoostedMotorsports]

Yeah depending on your vehicle there should be a kit or you can make your own to make it happen 👍

[@brandonmarinez3940]

its more of like a diagnostic tool instead of sounding cool to people, easy to tell when there is a boost like on a supercharged application when i can't hear the bov, and i have it on my 1991 fox and it never gets annoying.

[@cory0702]

Did you find a BOV you like. I'm going to install my procharger on my challenger next week

[@PM_Anthony_Albanese]

Did it work?

[@cory0702]

@@PM_Anthony_Albanese yes works great

[@elevatedperformance]

It’s cool on a corvette which u drive like 2 times a week man, I would never install it on a truck

[@stringsattached67]

I turn up the volume on my stereo 😊

[@hakansundstrombmwsweden7645]

How about a cluched drive ....pedal sensor activated

[@hershellumiere]

I want supercharger whine AND blow off valve.

[@markd1199]

Smart dude but put a set of “Who’s Ears” racing slicks in front of him and hear what he has to say!😂 JK, thanks for the content John!

[@BoostedMotorsports]

🤣

[@user-jw2jm1jr5p]

Yeah I could easily live with that lol

[@Jaime7188]

I dont know man, i used to have a tuned veloster turbo, and i never got tired of the atmospheric bov i had on it.

[@dealertag]

Because Your supercharger isn’t as big as his

[@jonf2009]

​@@dealertagit's because he's a Veloster... Turbo it's not building boost at cruising speeds 😂

[@adds8254]

Couldn’t you just get a heavier spring on the BOV?

[@jadrinue8085]

Wanna sell It if u still have it I am going to run novi2000 on ls 6.0l

[@Telexic]

Funny, that’s exactly why I want a vent to atmosphere bov, so it wooshes all the time hahaha

[@yobringitondown5565]

So run a pipe from the blow off valve to the exhaust system 👍🏼

[@northwestsuburbs20]

Same issue sbf 302 vortech v1 10psi with a2a intercooler and tial bov with ms3 goldbox. Blows air like a mf when letting off around 70mph with 4.10 gears and a t5. Bout to put another bov to help let the air out better when running 70mph and crusing. Shit is annoying as fuck after awhile

[@Bounc3backhoodie]

I’ve got a c230k supercharger comes with a bpv and I’m gonna put a bov on it if anyones wanting to see that just lmk I’ll be makin a video it’s a badass car

[@highseaspaul7905]

I got a novi 2200 on my 3v mustang with 410 gears and have stock blow off . It’s always blowing off air kinda annoying I guess it would be worse with after market one . Thinking of going 373 gears now that I’m boosted for cruising.

[@BoostedMotorsports]

Yeah some people like it but a constant hiss just sounds like a boost leak to me lol

[@95Sn95]

Rig up an Electric exhaust cutout on blowoff so you can choose where the air goes... Huh huh yeahhh lol

[@PM_Anthony_Albanese]

You can't just "put a heavier spring in the BOV or tighten the adjustment screw down so it doesn't leak" on a supercharger setup. If there's nowhere for excess belt-driven boost to go during extended partial throttle or no-throttle+high rev engine braking periods, you'll blow the intake piping off. Stop thinking that superchargers work like turbos. They don't. They are belt driven, making boost even when you don't need it. You don't need to "tighten down the BOV to build boost quicker". It's belt driven. It does not spool up. There is not lag from low exhaust pressure. It builds the boost instantly from belt rpm. You can't help it "build boost faster" because it's mechanically linked to the engine and building it no matter what you do. If you "tighten down" a BOV in this case, where is that 3psi of pressure in the intake going to go while your foot is barely or not on the throttle during extended light cruising or downhill engine braking periods? It's going to blow the charge pipes off if it can't vent because you stupidily put a BOV on there and tightened the adjustment down. Re watch his video. He is trying to explain this to you, but you cavemen are like "Derr... Just tighten dat bov down... It's a turbo..."

[@deadsetmoto2699]

Bro all you have to do is get a stiffer blow off valve spring so that it requires more pressure to constantly hold that valve open

[@sspeedy43]

Well then where would the pressure go when throttle body is closed? Wouldn't that be bad on the SC? Noob here

[@driftx2]

A higher psi spring lowers the noise. I understand you need to bypass air off throttle but there's a balance point where the spring is soft enough to bypass air at idle and also not open too wide to cause annoying hiss.

[@TunedRAMS]

🐌

[@Marc_Wolfe]

"Hopefully I can explain this without it getting to confusing for you guys." hopefully you can explain it without confusing yourself.

[@stanglifemike]

Exactly! Blow off valves may sound cool, but they're not as functional on a supercharger as a bypass valve is. I've always ran the Vortech bypass valve that Vortech supplied with the supercharger. I rarely see/hear a BOV on a supercharged vehicle, but when I do I immediately know it's one of two types of people. It's either a track car that rarely gets driven on the street, which has a legit reason for a BOV Or it's a young kid who thinks they're super cool, when in reality their build doesn't make sense(and doesn't make much power either).

[@FJTabb]

Did you ever experice any flutter? I'm having my kit installed on my Mustang, and I have the standard bov and also had purchased the upgraded one bc I heard the standard one can only handle 6 to 8 lbs of boost. I should be running somewhere around 10 or 11.

[@cameroncurtis8271]

It prob wouldn’t do that if it was 50/50 instead of 100

[@RBRM3]

Superchargers constantly build pressure but not slow like a compressor and if it's a daily driver and it has a loose spring it's going to be like you took the super charger off and you really need a bypass. Lol it just sounds like you turned your AC on and off!

[@mr34]

Does a superchanrged vehicle run a mass air flow sensor? It would be measuring the airflow coming in, but with that BOV all the air is venting. Otherwise the MAF would have to be after the BOV, but before the throttle body.

[@luiiiiiiiiiiiiighgh7]

And everyone tells me that it would never sound as much as it would on a turbo car. But you are saying otherwise. I’m confused as fuck

[@BoostedMotorsports]

Here is what it sounded like when I had it on . Let me know if yours sounds similar👍 kzbin.info/www/bejne/i53Lq3-Ofp6ekM0

[@stevenpo1963]

Can a broken bypass valve in your supercharger blow your Engine

[@BoostedMotorsports]

Probably won't blow the engine but might damage the throttle body by bending the flap into a taco if you get off the throttle and the air has nowhere to go lol

[@stevenpo1963]

@@BoostedMotorsports Thanks I bought my 2003 Ford F-150 HD Super Charged and it engine spun a bearing and had broken bypass valve so our guess that what happen ? but got cheap I just got another Engine and it's fine. but in back mind if that what happen

[@95Sn95]

Well there's 2 solutions get the subs bumping or install your cool mad max blower activator switch duhh😛

[@burntchickennugget191]

Maybe the blow off valve needs a resonator.

[@mikalarrington8112]

The easiest way would of been changing the spring

[@fusestation2839]

😂😂😂

[@jeffgood6441]

Idk buddy my whole custom m45 front mount and two bov set up works like magic for me I get 8 psi right off idle

[@MicDropBBQ]

I was understanding everything until you said BOOST at the very end of the video. What's boost mean? LMAOOOOOOOOOOO!! I'm kidding!

[@BoostedMotorsports]

haha 🤘

[@MicDropBBQ]

@@BoostedMotorsports I just picked up a Procharger system for my 2011 Wrangler JK. It came off of a 2020 Gladiator. This is gonna be interesting. The system came with the Procharger blowoff valve, but I've got an aftermarket one sitting on the table trying to decide which one to go with. Your video broke down a lot regarding the possibility of the valve sounding like crap while just cruising. I like the look of my aftermarket "red" one, but I may have to go with the Procharger valve, as it's just like you said it is: has the little lever on the side that's operated by the diaphragm. I'll do a video of the install/sound test and do it on my channel hopefully within the next couple of weeks. Hoping for the best. I had to watch your video, tho.

[@Marc_Wolfe]

"I can hear it working like it should, oh my god, so terrible." A whole lot of filler bullshit to get to the point, and more filler bullshit after.

[@JoseOrtiz_1416]

Ill take that blow off valve off your hands !!

[@JROC734]

IMO if you go centrifugal then go with a BPV/Wastegated setup. You've got a V8. Who needs all that ricer pssshhh noise? To me if you're looking for performance, then a wastegate is a better mod than a BOV on a centrifugal setup. With that said I've always personally just had positive displacement blower setups since 06.

[@tuwhelzreally741]

Can u add it without a super charger lol