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Old 01-24-2009, 10:22 PM   #1
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Default How to Make a Loud BOV Quiet.

Wrap that bitch in foam.

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It's a lot quieter now. Just easing around town without boosting, I don't hear it. Before you'd hear it no matter what. If I get on it some and make a few PSI, I sometimes here it, but barely. Probably not audible from outside the car. Full boost, you hear it, but it's not much louder than at a few PSI. I'm gonna try wrapping a little piece of metal around the foam where the BOV vents tomorrow. This may make it quieter and will help keep from blowing all the foam out. Currently have 3 zip ties holding the foam.

The intake is now 10x louder than the BOV. Working on a solution there too.
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Old 01-24-2009, 10:46 PM   #2
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I have to assume you like your cars quiet. I don't think you would enjoy my car!
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Old 01-24-2009, 10:51 PM   #3
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why didn't you just recirc. it?
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Old 01-24-2009, 10:55 PM   #4
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Quote:
Originally Posted by Rafa View Post
I have to assume you like your cars quiet. I don't think you would enjoy my car!
ditto
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Old 01-24-2009, 10:55 PM   #5
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LOL pat and his never ending quest for all things quiet
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Old 01-24-2009, 10:59 PM   #6
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Hahaha Someone wants a sleeper...
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Old 01-24-2009, 10:59 PM   #7
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How to Make a Loud BOV Quiet.

Wrap that bitch in foam.


NOT...you probably reduced the flow by a good amount. BOVs or BPVs need to be fast-acting in order to shift huge quantities of air before the charge line between the compressor and throttle body shoots up in pressure, thus causing a reversal of flow and the resultant turkey gobble.

Use a bypass valve if you want a quiet BOV. If its good enough for Formula 1 and every single OEM or factory racecar ever made, its good enough for you. subaru has the best OEM bypass valve and you can have one for $20 if you look.
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Old 01-24-2009, 11:02 PM   #8
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with his intake consisting of a 6" (just a guess) pipe I seriously doubt recirculating the air back there will make it any quieter...that is unless he'd extend the intake and install the stock airbox or something.


is that a heat shield you are working on in the first picture Pat?
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Old 01-24-2009, 11:04 PM   #9
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Anything is quieter than a blowoff valve. I have a 6" pipe too and I can barely hear my bypass valve.
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Old 01-24-2009, 11:06 PM   #10
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Quote:
Originally Posted by the_pipefather View Post
anything is quieter than a blowoff valve. I have a 6" pipe too and i can barely hear my bypass valve.
+1
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Old 01-24-2009, 11:08 PM   #11
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Basically I couldn't recirculate it. At least, not easily. The intake is basically a filter on the turbo, with no room for anything else.

Yes I'm going for the sleeper look, and sound matters too.

Whether it hurt flow or not... I really don't care. This turbo surges/flutters (whatever it's called) when I shift below 3500. That is, until the BOV finally stops dragging it's *** and opens. Still does the same thing as before with the foam, only now I hear "flutter-flutter-silence...". I should probably get a softer spring for the BOV so it will open sooner.

I'm gonna wrap the air filter in foam too after I build enough heat shields to feel safe doing it. Don't care if that hurts performance either. I want a quiet, reliable, fast car. In that order.
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Old 01-24-2009, 11:09 PM   #12
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Quote:
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is that a heat shield you are working on in the first picture Pat?
Maybe.
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Old 01-25-2009, 12:29 AM   #13
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Quote:
Originally Posted by patsmx5 View Post
Basically I couldn't recirculate it. At least, not easily. The intake is basically a filter on the turbo, with no room for anything else.
I now understand

Quote:
Originally Posted by patsmx5 View Post
This turbo surges/flutters (whatever it's called) when I shift below 3500.
if "some" users had let lazzer finish his electronic BOV this could have be remedied
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Old 01-25-2009, 12:46 AM   #14
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Quote:
Originally Posted by mazda/nissan View Post
I now understand



if "some" users had let lazzer finish his electronic BOV this could have be remedied
Sigh. I agree. I PM'd Philip after he banned him and philip said drop it or I was banned. I know he's back now that philip is gown, but he doesn't post much.
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Old 01-25-2009, 12:47 AM   #15
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Side note- I keep looking on google for info on how to make an intake quiet, and all I'm getting is "how do I make my intake louder"....
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Old 01-25-2009, 12:54 AM   #16
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Quote:
Originally Posted by patsmx5 View Post
Side note- I keep looking on google for info on how to make an intake quiet, and all I'm getting is "how do I make my intake louder"....
I think while browsing through FM's 700 some-odd (probably more now) pictures they have in their album, I saw a few of a car with what looked to be a large chunk of foam that was carved hollow with holes cut into it for air flow placed over the filter, and that it did a great deal in quieting the intake.....At least I think it was in FM's photos...
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Old 01-25-2009, 12:55 AM   #17
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There are electric BOV's out there.. I've heard interesting good things about them.
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Old 01-25-2009, 01:08 AM   #18
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Quote:
Originally Posted by mazda/nissan View Post
I think while browsing through FM's 700 some-odd (probably more now) pictures they have in their album, I saw a few of a car with what looked to be a large chunk of foam that was carved hollow with holes cut into it for air flow placed over the filter, and that it did a great deal in quieting the intake.....At least I think it was in FM's photos...
Indeed, I've seen those pics. They even dyno'd a car with a FM cold air intake w/ and w/o the foam, and said the foam made no difference in HP. Someone else on m.net also did with and w/o the foam on a dyno and got the same results. Only thing is all these people that put foam on them have badass cold air intakes. I can't do anything like that.
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Old 01-25-2009, 01:59 AM   #19
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Quote:
Originally Posted by patsmx5 View Post
Side note- I keep looking on google for info on how to make an intake quiet, and all I'm getting is "how do I make my intake louder"....
that is what you get when you try to go against the flow in a world filled with ricers
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Old 01-25-2009, 02:12 AM   #20
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Hang in there Pat. I like my intake and BOV quiet too. I might even go to a *gasp* recirculating setup.
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