BOV making too much noise (Watch bryantaylor turn into a douche bag before your eyes) - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 11-18-2007, 10:47 PM   #41
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oh you mean you just fell for your own douche joke?
DAMN!
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Old 11-19-2007, 04:45 AM   #42
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Hey guys,
Thanks again for the replies. I am serious in my question. It's not funny having a Turbo Miata in a Country that takes illegal modification seriously. Last thing I want is for a copper to pull me over cause he heard my BOV venting. Besides, i don't really personally care too much for the sound and if i could soften it without compromising too many things, I would.
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Old 11-19-2007, 04:27 PM   #43
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thats what i was talking about one of the mods has a SENSE of humor. my sig was changed to what it is now and i had that huge avatar.
look here ************. I'm tired of ------s like you, coming in here acting like your a bad *** or some ****. I don't really appreciate your clandestine homo-erotic, hand-balling lust for black leatherdaddies. Next time you decide to post, you should think, "if I make this totally queer comment, is this childish comment going to **** off Sir. Hustler Esq, et al. and motivate him to reference my IP (which he just recorded), come to my house, and throw me face-first through a wall while my girlfriend rusty-trombone's him."

If the answer is yes, then I hope you're wardriving on someone's network. Tone down the disrespect...you do not want to **** me off. You've been warned.
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Old 11-19-2007, 04:41 PM   #44
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Hey guys,
Thanks again for the replies. I am serious in my question. It's not funny having a Turbo Miata in a Country that takes illegal modification seriously. Last thing I want is for a copper to pull me over cause he heard my BOV venting. Besides, i don't really personally care too much for the sound and if i could soften it without compromising too many things, I would.

Your best bet is ditching the cone filter and trying to rig something up with the factory airbox. Failing that you will have to experiment with adding some sort of baffling either in the intake or to the discharge from the DV.

If you have a length of hose from your DV to the intake tract adding some sort of chamber to it might do the trick. Or increasing its size to decrease the air velocity.
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Old 11-19-2007, 04:53 PM   #45
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look here ************. I'm tired of ------s like you, coming in here acting like your a bad *** or some ****. I don't really appreciate your clandestine homo-erotic, hand-balling lust for black leatherdaddies. Next time you decide to post, you should think, "if I make this totally queer comment, is this childish comment going to **** off Sir. Hustler Esq, et al. and motivate him to reference my IP (which he just recorded), come to my house, and throw me face-first through a wall while my girlfriend rusty-trombone's him."
If the answer is yes, then I hope you're wardriving on someone's network. Tone down the disrespect...you do not want to **** me off. You've been warned.
EEWWW! Yer sooo scary.. I think I peed my pants.....:gay:
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Old 11-19-2007, 04:57 PM   #46
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look here ************. [etc., etc...]
<- Hustler.
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Old 11-19-2007, 05:01 PM   #47
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EEWWW! Yer sooo scary.. I think I peed my pants.....:gay:
I'm into water sports.
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Old 11-19-2007, 06:30 PM   #48
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<- Hustler.
This thread is full of
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Old 11-19-2007, 07:04 PM   #49
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Hey, no fair stealing my avatar!
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Old 11-20-2007, 04:07 AM   #50
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Your best bet is ditching the cone filter and trying to rig something up with the factory airbox. Failing that you will have to experiment with adding some sort of baffling either in the intake or to the discharge from the DV.

If you have a length of hose from your DV to the intake tract adding some sort of chamber to it might do the trick. Or increasing its size to decrease the air velocity.
Thanks! That was on my mind as well. Appreciate it
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Old 11-21-2007, 02:41 AM   #51
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No, that means it's working properly. When it's adjusted juuuuust right, you should get a little *pssht* on almost every shift, even if you're not in boost.
actually, i just remembered that i used to have the bov venting everytime i changed gear or liften my foot off the loud pedal, even though there was no positive boost being made yet. But i couldnt take the noise and tightened the spring so that it vented only when the turbo is pushing.

why would it be just right if it vents on every shift? shouldnt it vent only on making boost?
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Old 11-21-2007, 07:31 AM   #52
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actually, i just remembered that i used to have the bov venting everytime i changed gear or liften my foot off the loud pedal, even though there was no positive boost being made yet. But i couldnt take the noise and tightened the spring so that it vented only when the turbo is pushing.

why would it be just right if it vents on every shift? shouldnt it vent only on making boost?
Your engine is consuming air and even though you may not see boost in the manifold that doesn't mean your turbo isn't pushing air and when you close the throttle plate the inertia in the wheels in the turbo keeps them spinning thus creating a little positive pressure differential.

Mine will vent even at 8 inHG of vacuum while accelerating.
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Old 11-21-2007, 12:12 PM   #53
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His Bryceness is right on the money.

The whole concept of boost vs. vacuum tends to confuse. It's a convenient measurement since most of us have a handy reference point available at all times (the earth's atmosphere) but it's not the whole story.

Air has mass. And therefore it also has inertia. When air is flowing through the pipes at a certain velocity it wishes to continue doing so, and when it's not moving it tends to resist efforts to the contrary.

The turbo is spinning pretty much all the time, even at idle. It may not be spinning fast enough to produce a relative pressure gain, but it's spinning none the less. Say you're cruising along at 3,000 RPM at 10" of vacuum. A certain volume of air is passing through the system, and the compressor is just freewheeling happily along at a certain speed.

You close the throttle plate to shift.

If the BOV does not open, the suddenly the volume of air passing drops to zero, its velocity drops to zero, and now the compressor, which was happily freewheeling along, faces resistance. It begins to create a slight pressure differential, then stalls and drops rapidly in speed.

Now, all of this is such a minor point as to be academic. I grant you that.

But the whole point of adjusting the BOV so that it vents at idle is not so much the venting at idle bit itself- it's an indicator of the fact that when it comes time to vent under boost it will open sooner, vent more quietly, remain open longer, and generally do the job of being a BOV better.
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Old 11-22-2007, 03:50 AM   #54
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alrighty! Thanks again guys.
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