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Does anyone have any sound clips of any? When it comes to these I'm a virgin. Anyone have any recommendations?

 
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hks ssqv or greddy type-s

 
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im going to be using the HKS SSQV when my kit comes in... it sounds great on my friend's eclipse

 
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I remember reading somewhere about how it doesn't matter how "loud" your BOV is - rather how effecient it is at bleeding off the excess pressure. From what I have been reading in here, the turbo XS is supposed to be the loudest. Does anyone know which one is supposed to be the most EFFECIENT?

 
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Ok - I'll throw another question on the table....I've read a few articles about venting the BOV to atmosphere or recirculating it back to the intake. Most said that that if your car relied on a MAF sensor, than you should (for best performance) recirculate back. If a MAP sensor was the only thing that the car used vs the MAF sensor, than you COULD vent to atmosphere (which is what everyone likes). As far as I know, our car utilizes the MAP sensor vs the MAF sensor, am I correct? So venting the BOV shouldn't going to hurt performance? Can anyone verify this?

 
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wwww.blowoffvalves.com

 
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our cars don't use mass air flow sensor... i think it uses a MAP setup... so venting out into the atmosphere won't be a problem...

i think the problem with venting air into the atmosphere with MAF is that the car sense a lot of air coming into the intake tube but as soon as it blows off, a lot of that air is released and the air/fuel and the timing of the car is all screwed up... when this happens, the car tends to stall...

correct me if i'm wrong...

 
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Yeah, I've checked out that site - some of the clips work, others are down. I like the HKS clips. But one of them doesn't work.

I believe the one that works is stock? From what I hear, you can get the purple insert which is supposed to lower the pitch of the blow off.

I'll probably go HKS SSQV, but wouldn't mind peoples opinions on other manufacturers, since I've heard that the HKS might not be the most effecient at preventing compressor surge, when compared to Greddy, Blitz, etc...

 
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2 of my friends have WRX's, 1 has a Blitz BOV and 1 has a HKS SSQV, the HKS sounds loud and would definetly put fear into whoever your about to own. sounds almost like to swords clashing together. as for the blitz, its pretty quite and gives the classic "PSSSSHHH" sound.

 
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ALL i can say is TURBOXS RFL.. 147db.. sounds SOOOOO sweet.. and does a GREAT job.. very reliable .. SOOOO glad i got it with my kit!

 
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Damn, I made a big post then the server locked... here we go again...

Our cars use the MAP setup. Turbo DSMs use a MAF sensor. When you run through a gear at high boost on those cars, then let off and disengage the clutch, it stalls. It will even stall once and a while running through half of first, which is a pain in the parking lots. Our cars use MAP sensor which eliminates this issue. Atmospheric BOVs are fine on our cars.

 
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The actual problem with MAF sensors... is that they read the airflow through the intake before the turbocharger. So the air that is vented into the atmosphere, is air that has already been metered, and the ECU has already adjusted fuel for it and has no way of telling that air has been discharged. So the injectors open up, deliver more fuel, but the air isn't there to support it so you run rich.

On the opposite end of the spectrum, you have the MAP which monitors air in the manifold. Since it's after the turbocharger, the pressure can be blown off at the same time the ECU monitors it. So you have no problem with MAP sensors because it knows how much air at all times is in the pipes and can make the adjustment.

 
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Another issue - some BOV's remain open at idle (from what I have read). Thus bypassing ther air filter and its main purpose - to filter the incoming air charge to the engine. I know some have filters built in, others remain closed at idle (HKS is supposed to). Anyone know what the story is with some of the other popular BOVs?

 
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if it remains open what makes it close, this is news to me on any type of BOV

 
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the spring inside the BOV makes it close. The boost pressure pushing it open, along with the vaccume inside the manifold (after you let off the throttle) is what makes it open. The vaccume + boost pressure is a great enough force to open the BOV and release that pressure.

 
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Most BOV's, as Cat said, use a spring plus vacuum source to actuate the internal check valve. When there is boost present, the boost is pushing on the spring side of the check valve, thus holding the BOV closed. When at idle, or when you let off of the throttle, the engine will be at vacuum - thus releasing pressure from the spring and allowing the BOV to open.

Some BOV's are open at idle due to the combination of their spring pressure and the vacuum present, which is why you would need a small aif filter of some sort (ie nylon or something) to cover the ports - otherwise there is the possibility of sucking some crap into the engine.

I am not sure what BOV's remain open and which ones close. I believe someone was saying that HKS' closes due to the spring pressure, BUT - I am not 100% positive.

Go to google and type in BOV filter, and see what comes up!

 
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I wanna hear the bov sounds in d17's considering the fact that we have them I dont want to hear the wrx or anything else because that turbo setup is way different.

 
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so will any bovs is good for our cars (not including sound) or does it matter?