Is it possible to put a BOV on a D/A Supercharger?

[Pouya]

Originally posted by Agaponi


HKS makes the SSQ BOV that work like a 2 stage BOV, so you can work on the low boost release (idle) and high boost release (shifting)...

The SSQV is actuated by pressure alterations only, not by the rate of pressure or vacuum in the line, which ensures a quick valve response and complete closure during idle. On typical blow-off valve designs, a large valve is utilized in order to accommodate high boost / high horsepower applications. However, these large valves tend to react slowly and require high activation pressure to open, therefore are not able to activate and prevent compressor surge at light-load conditions. On the other hand, smaller, fast reacting valves do not discharge the airflow capacity required for high horsepower applications and tend to creep open and leak as the boost pressure overpowers the spring on these push type valves. For maximum performance, the HKS SSQV incorporates both a small primary valve for ultra quick activation, along with a larger secondary valve for additional discharge capacity. The SSQV is engineered to initially open the small primary valve at light throttle and load conditions, then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions.

[Pouya]

Originally posted by kumanchu


the turbo equivalent of this bypass valve is actually the wastegate; which reroutes air going to the compressor from the intake side of the turbo manifold.

I think you are confusing your terms! A wastegate has nothing to do with the compressor stage of the turbo! An external wastegate gas is either dumped into the atmosphere (loud!) or rerouted back into the exhaust path (not as loud, but can cause turbulence and backpressure if not dumped about 18 inches away from the turbo). A turbo manifold is the equivalent of a exhaust manifold or a header. There is no such thing as an intake side of an exhaust manifold! That's like me saying the "air filter side of my muffler." Turbocharged cars also have bypass valves. In fact, a lot of turbocharged cars stock come with these valves.

[Pouya]

Originally posted by kumanchu
the blitz super siren bov is loud cause it was designed to be. the hks ssbov gets the sound closest to when you actually say psssh so people are atracted to it.

BlitZ super siren? I think you mean the BlitZ Super Sound or Dual Drive blow off valve.

The HKS blow off valve you are referring to actually sounds nothing like the typical blow off valve. Since it is super sequential it sounds different depending on how much boost is vented. It has more of a high pitch tweet, like a rush of air mixed with a bird. Click here to here it go off on a Supra.

[uberpanzer]

Is that HKS one the type that is used on the WRC cars? I'm at work w/out speakers and can't hear the sound FXs. Also saves me from getting it later (when I get home).

[Solokron]

Gawd damn the blitz super siren bov is loud!

[jagsm3]

where can I get one and how much?

[kumanchu]

no there at least WAS a super siren; i'm positive. i should have an ad for it in one of my older ricer magazines somewhere. and the the sound that i was talking about out of the hks unit was from the high pressure release.

[nickl382]

Originally posted by kumanchu


yes i'm aware of what a BOV is for; you are somewhat correct in what you are saying. a bov allows excess boost to be released in a turbo charged system. why? because if you don't dump that extra boost; you put MAJOR stress on the turbo

Just wondering how many people here have their knowledge from hands on experience, word of mouth, research, ???

I think that is a necessary credential to list when spreading your devine omniscience here on the board.

[mgd]

Well the answer to title of the thread is Yes, it is possible. But does it run with only a bov? No. I went to pick up my car today with the HKS SSQ BOV installed with my supercharger, and it runs well on open throttle, but any steady rpm and it studders and runs like crap. Doesn't stall though. The guy at the shop recommended installing the recirculating bypass in addition to the bov. That way it will still recirc and be able to blow off. The supra's he works on use two bov's, so he said it should still be audible.

Is anyone familiar with the HKS SSQ? When it blows off it sounds like a series of chirps. Could that be because it's not tuned for it? Or is that how it's supposed to sound? Thanks

[E30stain]

its susposed to sound like a series of chirps... as u all hopefully know by now its the pressure of the air pushing the BOV open... when it pushes open it doesnt do it exactly smoothly or open a great deal... since it only opens as a small gap the sound it high pitched and as the pressure is released the BOV closes, while its closed the pressure builds up again causing another release... as it operates on whatever psi you set it then the pressure(depending on which brand/model BOV) in the manifold fluctuates (from memory) about 0.2psi (please correct me if you know the proper value)... hope that clears things up... and they theoretcally should work on a SC as when you take your foot off the accelerator, yes the supercharger slows down(faster than a turbo) but the throttle body is still closed... so there should still be enough pressure there to use a BOV, i personally like bypass style because its more stealth... but then again i dont like people knowing my car is more powerful then theirs until i strip them of victory.

[E30stain]

oh and the fluctuations may be the factor that causes your idle to be off... using 2 BOV as u mentioned sounds like a good idea as it will smooth it out (like an engine, 2cyl exhaust flow is smoother than 1)

[E30stain]

oh lol bump... yeah its an old thread :P

[Highboosted]

Yes....it's an old thread.


And one thats SOOOO full of misinformation and people who don't know crap about supercharger and turbocharger systems it's unbelievable.

BTW, the SSQV is not supposed to sound like a series of chirps. I have a couple of them on my car, and if they are overtightened they will chirp repededly, but not intended to do that because of the stress your doing to the compressor.

Funny thing is, throughout this thread I didn't read ONE post that had correct information in it.

[E30stain]

lol i meant atmospheric BOV in general... hmm maybe im wrong but thats what a mechanic told me and being a physics(sorta) student i looked at it and it seems to work out :P.

[Stealth]

wow....