does your FM bov sound like a turkey
#1
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does your FM bov sound like a turkey
i have a flyin miata bov, and it sounds silly? it is recirculated. any where from 1/2psi and up it sounds like a turkey gobble:gay: . is this normal for this bov? are these known to be not good. since it is recirculated i expected it to be silent. other than the noise it seems to work fine.
#13
It flutters because when the throttle closes the valve opens, relieves some pressure, closes, turbo is still spooling down because it's ball bearing, pressure builds even as it slows, BOV opens again and etc. until the turbo is spooled down. A really good BOV for a street application, where boost is "low" (like less than 20psi), will have a multi-chamber design and lower port that you run another vacuum line to, this alleviates this problem. Don't know if the FM BOV has this but if it doesn't, it should.
#14
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It could be as simple as the adjustment screw is just too tight....
"fluttering" is best described as the piston opening and closing rapidly...when the piston has too much preload, the vacuum in the chamber allows it to open, but the boost pressure is not enough to keep it open, so it rapidly opens and closes, and it sounds like fluttering...
this is flutter: http://www.youtube.com/watch?v=Y4bZHpT-L38
"turkey gooble" or compressor surge is caused when the boost pressure is not released out of the valve. It instead is released out of the intake, but first causes the compressor wheel to spin in the opposite direction....this is the noise you hear, it's bad for the turbo and why you have a valve to begin with.
this is surge: http://www.youtube.com/watch?v=nTnUaBWXm88
"fluttering" is best described as the piston opening and closing rapidly...when the piston has too much preload, the vacuum in the chamber allows it to open, but the boost pressure is not enough to keep it open, so it rapidly opens and closes, and it sounds like fluttering...
this is flutter: http://www.youtube.com/watch?v=Y4bZHpT-L38
"turkey gooble" or compressor surge is caused when the boost pressure is not released out of the valve. It instead is released out of the intake, but first causes the compressor wheel to spin in the opposite direction....this is the noise you hear, it's bad for the turbo and why you have a valve to begin with.
this is surge: http://www.youtube.com/watch?v=nTnUaBWXm88
#16
It could be as simple as the adjustment screw is just too tight....
"fluttering" is best described as the piston opening and closing rapidly...when the piston has too much preload, the vacuum in the chamber allows it to open, but the boost pressure is not enough to keep it open, so it rapidly opens and closes, and it sounds like fluttering...
this is flutter: http://www.youtube.com/watch?v=Y4bZHpT-L38
"turkey gooble" or compressor surge is caused when the boost pressure is not released out of the valve. It instead is released out of the intake, but first causes the compressor wheel to spin in the opposite direction....this is the noise you hear, it's bad for the turbo and why you have a valve to begin with.
"fluttering" is best described as the piston opening and closing rapidly...when the piston has too much preload, the vacuum in the chamber allows it to open, but the boost pressure is not enough to keep it open, so it rapidly opens and closes, and it sounds like fluttering...
this is flutter: http://www.youtube.com/watch?v=Y4bZHpT-L38
"turkey gooble" or compressor surge is caused when the boost pressure is not released out of the valve. It instead is released out of the intake, but first causes the compressor wheel to spin in the opposite direction....this is the noise you hear, it's bad for the turbo and why you have a valve to begin with.
I loosened and tightened mine and it is the same either way. Mine sounds more like the surge video out of the two that braineack posted.
#17
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