Blow Off Valves 101: What they do, and why you need them! Tech Tip Tuesday

Рет қаралды 95,116

4 жыл бұрын

Blow Off Valves (or BOV for short) are a topic we get a lot of questions about. They are actually very simple, and way easier to size than a wastegate. Simply put, you cannot OVER blow off valve a combo, you can't put too big of one on (that we have every been aware of, someone will prove us wrong with a 160mm bov on a 4 cylinder some day).
For our full list of Blow Off Valves click below. We stock and carry PTE Precision Turbo, JGS, & Turbosmart
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Got a question? Give us a call at (800) 878-9274 or email us at sales@motionraceworks.com

Пікірлер: 47

@Trialnerror 4 жыл бұрын

I developed shaft play at an early age.

@darrentylor5473 3 жыл бұрын

Eww tmi

@Parkway808 3 жыл бұрын

Definitely suffering from premature shaft wear

@LoneStarStinger 3 жыл бұрын

😶

@jamisonderek1607 3 жыл бұрын

You probably dont care but if you guys are bored like me atm you can watch all the new movies and series on InstaFlixxer. I've been binge watching with my brother during the lockdown :)

@tuckerlangston8528 3 жыл бұрын

@Jamison Derek Definitely, been using instaflixxer for since november myself =)

@tim6913 7 ай бұрын

Thank you, after watching mini different videos, you’re the only one that has mentioned anything about superchargers and how to regulate boost

@jonathan7744 4 жыл бұрын

I agree that you need a BOV. But I feel like you only need the BOV near your throttle bodies. If you think about it closing the throttle creates a pressure wave starting there, if you have the BOV right there it kills the wave there. That means there should be no pressure build up in the intercooler or elsewhere. I may be wrong on this but it's what makes sense to me.

@abundantcat7448 3 жыл бұрын

noob

@mattsiev1 2 жыл бұрын

Turbo Buicks never had them and plenty of stock turbos and even upgraded ones last 100k plus like that. It's an old argument but I agree they help in the right application. Larger ones need them more. I run a 6465 at 30+psi without one but that's still tiny compared to what y'all are doin'. You loose that signature turbo Buick sneeze when you go to a bov too. ;) Keep up the great videos! I love 'em.

@bobby_hills_outdoors5227 4 жыл бұрын

Great Informative video ! 👍

@shawng7902 4 жыл бұрын

still undecided on a blow-off valve for mine. Heard so many arguments both ways. This does sound reasonable though. What I don't like is it being open at idle. I watched a kid install one on his turbo mustang and they were all so pumped. Then I watched it as they drove. They put theirs right down at the intercooler. Driving around at normal speed with vacuum they had a 2" open valve right down at street level in the dirt. Then I heard that they spring them to engine vacuum. I thought that would keep it closed until boost overcomes the spring pressure. No here you say that they are open and floating back and forth at idle. So once again I'm lost and don't know what to do. I think I will still go ahead and run one at the TB just to save the intake and intercooler just in case.

@JeLifeCoach 3 жыл бұрын

This was awesome. Thank you so much. Could you do a video over BOV w/ cars that are MAP Sensored and not MAF sensored? I dont think there is any problem in a MAP sensored car w venting full to amtmosphere, but some people stay recirculating/atmosphere BOV on a MAP car will help will throttle response. I feel like it is being argued both way and Im not so sure. Thanks

@JWP1990 4 жыл бұрын

Can you explain the spring pressures on bov’s?

@jonathanmoore5112 2 жыл бұрын

I’d like to see more information on how to select the correct blow off valve for your vehicle (-6,-8,-10)

@adrianberryhill 4 жыл бұрын

@3:01 My new Freedom Motion Raceworks hat has been a major contributor to this issue 🇺🇸

@MotionRaceworksOfficial 4 жыл бұрын

🤣🤣🤣🇺🇸🇺🇸🇺🇸

@davepalmer4125 3 жыл бұрын

Have you done a video on plumbing the oiling system for a turbo?

@UnknownDevice. 3 жыл бұрын

Can you explain the purpose of soft & hard on a blow off valve.

@ImTheBOSSRoundHere 3 жыл бұрын

Well my boost gauge goes down when I slam the throttle shut as you also unload the turbine wheel. Ill take my chances for that sound thoooo. 1700 miles currently with no bov but granted I'm not running a 1000+ dollar turbo

@Nstyle46 18 күн бұрын

We need a new one with the icon!

@mcssmostwanted 4 жыл бұрын

Some GTO love ❤❤❤❤

@roscoadventures2194 3 жыл бұрын

Hi Doug got question I hooked up Yamaha blow up valve V2 works I'm confident I did it right hooked vacuum line to map senser do U no why my blow up valve will not open and close at all brand new in box can I ajust aleen key and screw nut on top maybe?

@jasperpipes4222 4 жыл бұрын

2:00 Pulling boost into cylinders ? You should change from Tech Tuesday to Fabricated info Friday !

@tammypapa1 4 жыл бұрын

What size would you need for a 80mm turbo on a sbc . New build

@BOSS-jf7on 4 жыл бұрын

Would you explain how and why of springs , CO2. Also the strategies of their use. Thanks for sharing!

@BOSS-jf7on 4 жыл бұрын

Ok, I got it. I watched it again.

@adamkelleyrealestate6976 3 ай бұрын

Looking for advice on tuning a single cylinder motor cycle with a blow in carburetor setup

@jonathanmoore5112 Жыл бұрын

Should the bov be closed at idle?

@freddyrosenberg9288 10 ай бұрын

5:15 And that's how you know the blow off valve is not adjusted to suit the engine. A properly adjusted working blow off valve is shut at idle and it should take very little force to open it.

@attzelonvenus Жыл бұрын

if the car has 900-1000 hp is it okay to put on a low budget blow off valve ?

@1moderntalking1 4 жыл бұрын

Can u please do a video on superchargers and blow off valves? On say 9 to 12psi boost , would I still need that?

@NoferTrunions 3 жыл бұрын

Yes, maybe be completely different strategy since supercharger is always 100% connected to crankshaft, not like turbo with turbine waste gate.

@snuggleseal 3 жыл бұрын

Might sound like a dumb question, but I want a BOV that is loud, is there one that is the loudest? I am looking at the PRECISION TURBO PB64MM but the price is almost double others like the TurboSmart or HKS BOVs and I dont know why it costs so much more... :-\ thx!

@LoneStarStinger 3 жыл бұрын

Don’t get a trumpet 🎺 with your BOV... imo those are trying to hard.

@markgrayson8101 14 күн бұрын

@motionraceworksofficial Quick question, my car plays up if a atmospheric bov is used so have had to fit an uprated recirc valve, but I'm after some flutter, is there a way around this? I've heard a Turbosmart recirc do it on a video, but cant work out how? Any ideas?