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Discussion Starter #1
Hey guys, once again i'm looking for a bit of help. I have a similar thread to this asking what kind of BOV was good for a Genesis and i appreciate all your help for choosing it. Now i want to address the fact that i believe the stock turbo is too small to actually benefit from a BOV. Will it be a lower sound because of a small turbo and big BOV? Any tips/facts that help prove or disprove my theory? Please post and thank you again! The BOV i am singling out would be the HKS BOV.
 

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Honda Hunter
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not sure about sound between the size of turbos, i would think it would be the more boost the louder the sound but i am just guessing. as for if it is beneficial, i know this has been addressed before. the stock bypass valve it is equipped with from the factory is crap, and cars that are turbo in the US at least use these instead of atmospheric style BOVs like HKS etc. aren't used due to emissions related issues. any BOV that is not stock will hold boost better therefore improving performance, no matter what sized turbo it is. so in short, yes it is beneficial to replace the stock BPV with pretty much any choice BOV
 

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301 whp
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If you have done the silencer delete, it are running a aftermarket intake the sound is just as loud as a aftermarket bov. Much louder than my Synapse. If you are still stock without a flash you do not need a aftermarket BOV.
 

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Discussion Starter #4
I am still stock no flash. But i want that BOV noise. I dont want to try an intake first. I figure get right to the point.
 

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I am still stock no flash. But i want that BOV noise. I dont want to try an intake first. I figure get right to the point.


Do the delete.... ( 2 3/4" Pipe about 2" long. )

Remove the stock air box and connect a Spectra filter to your stock
air hose....

Then see how you feel about it.
 

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Island Coupe
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I am still stock no flash. But i want that BOV noise. I dont want to try an intake first. I figure get right to the point.

Then just buy an BOV. You said you just want the sound. :dunno: Either way, swapping out the stock BPV won't do any harm.
 

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301 whp
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It is loud enough with the silencer delete. Easy to hear but not obnoxious
 

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Island Coupe
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It is loud enough with the silencer delete. Easy to hear but not obnoxious
I agree that it was loud with the silencer delete. But you also sound like a big rig releasing your air brakes. :rofl:

The Darth Vader references are dead on also!
 

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in terms of just pure sound, I think the HKS SSQV is the best.

The CP-e intake also sounds great.
 

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Gooood! GOOOOOD!
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LoL! A cone filter on the oem intake tube = fail. Don't use Spectra filters either. They are not good quality.

If anything, use a K&N drop-in. You'll get the same sound increase, same tiny power boost, but a much more efficient filter.
 

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I keep it dirty and nerdy
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LoL! A cone filter on the oem intake tube = fail. Don't use Spectra filters either. They are not good quality.

If anything, use a K&N drop-in. You'll get the same sound increase, same tiny power boost, but a much more efficient filter.
It's funny... my friend is in the VW scene and one of the local build shops has a 1000 horsepower VW R32 (it actually won the euro-tuner shoot out last month) and at the front of the power maker is a spectre air filter... :dunno:
 

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LoL! A cone filter on the oem intake tube = fail. Don't use Spectra filters either. They are not good quality.

If anything, use a K&N drop-in. You'll get the same sound increase, same tiny power boost, but a much more efficient filter.
Of course thats only a temporary thing.... If he wants the sound like yesterday thats the way to go. lol
Id either get the k&n kit when it comes out or just stick with a AEM CAI Kit... Not to mention youll be able to get rid of the stupid silencer delete mod.
 

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I think the sound of the blow off valve is more related to the amount of boost your pushing and not the size of the turbo. The HKS BOV in particular will definitely sound different based on the amount of boost your pushing. The HKS has 2 valves one that goes off in low boost conditions and one that goes off in high boost conditions (which is why you don't need to adjust anything on this particular bov). The low boost valve will sound different than the high boost valve. You might not even get enough pressure without a reflash to open the high boost valve (which sounds awesome). The sound can also be altered by the type of sound insert you have in your HKS BOV (silver/gold are high pitch, where as the purple is lower in pitch) I use the purple insert, it gives off a nice mechanical release of air sound instead of the tweety bird sounds people usually assosiate with this BOV.
 

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Knows some stuff...
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the fact that i believe the stock turbo is too small to actually benefit from a BOV.
This kind of makes me think you don't know what a BOV is or does, or maybe you just wrote that wrong?

Any turbo needs a bov or a form of pressure release, and our car comes with one, just it recirculates and is called a CBV. So our turbo even though it is small will benifit from a BOV in that any turbo will as it will extend it's life, that is the purpose of a venting valve (no matter what you call it).

It really has nothing to do with performance (which it sounds like you are gettinga t when you seay benefit?). Though when you do go aftermarket, they generally have stronger springs or higher boost holding capabilities.

So if that is what you meant.... there is no reason to get a BOV on this car stock, as it doesn't produce enough boost to make the OEM CBV in-effective, then I would agree with you. As havinga CBV, there is no reason at all to have a BOV and there is no benefit at all. But if you get rid of the CBV, then a BOV is not only beneficial, but a must on this car.


As far as the noise level, the higher the boost, the louder it will be, the smaller the vent, the higher pitched, the larger the vent, the lower pitched and just like any musical instrument you can make it louder by making a bell type housing on the end. It has little to do with turbo size, and more to do with boost pressure.... which is kind of related to size, but more spool time than size untill you go really big.
 
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