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Old 11-18-2001, 07:52 PM   #1
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BOV noises

Hello people,

I was just wondering how people get that multiple pssht pssht sound when just of throttle. Is it a sequential BOV or something else. Some guy told me that it is turbulance in the piping, but I think he's full of shite. Or is it the BOV bouncing?

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Old 11-18-2001, 08:03 PM   #2
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hi,

when i dont boost to max boost, and let off the throttle at about 3-5psi , i get the flutter sound, and so do most cars that dont hit full boost with a blowoff valve....

I think its because there is not enough pressure to completely open the valve and because oif that it just flutters a little bit...

also on rotors and other drag cars ive heard , they have external wastegates which i have been told (im reluctant to believe) that cause the same type of noise?

Rowan
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Old 11-18-2001, 08:32 PM   #3
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G'day unfamilia,

Do you have a after market BOV or are y ou using the factory. Cause all mine does is pshht when the throttle is released regardless of how much boost is pumping. I really want that pssht pssht pssht sound, and I want it now god dammit.

Doc
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Old 11-18-2001, 08:34 PM   #4
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sorry,

Forgot to mention i have a go fast bits aftermarket BOV - equivalent to turbosmart Type 2 bov i think..

Rowan
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Old 11-18-2001, 08:38 PM   #5
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Unfamillia,
How dare you leave such an important peice of info out.
The only problem is that my mates RX7 made the similiar noice when before he got his BOV, and its not air going back into the turbo.

I'm f**ked if I know what it is.

Cheers big ears,
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Old 11-18-2001, 08:42 PM   #6
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Quote:
Originally posted by Doctor
Unfamillia,
How dare you leave such an important peice of info out.
The only problem is that my mates RX7 made the similiar noice when before he got his BOV, and its not air going back into the turbo.

I'm f**ked if I know what it is.

Cheers big ears,
Doc
Hey,
Its a sequential BOV. Standard BOV's will make a similar sound at half throttle but not as loud (not sure why tho) I just installed a GReddy Super Sequential and it makes that sound when you drive normally... if you full throttle her and let the car pull to 6-7k rpm then it just goes pssht. Also my standard BOV made a similar noise when not boosting to full... but the noise could hardly be heard and was a rather pathetic sound. hope it helps man
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Old 11-18-2001, 08:42 PM   #7
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it also made the same noise with my stock BOV (although VERY quietly)

An R32 GTS4 i test drove at hill motorsports had a fluttering sound whenever i changed gears, regardless of the throttle/.boost position - maybe give them a call ?
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Old 11-18-2001, 08:47 PM   #8
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Thanks ladies,

I appreciate the answers that you have supplied me with.
Unfamilia, didn't you buy a Skyline?

Doc
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Old 11-18-2001, 08:52 PM   #9
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unfortunately not yet - the sale of my familia didnt go ahead, and im relying on that for the most part of my finance towards the skyline ..

soon to own r32.. soon
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Old 11-18-2001, 09:09 PM   #10
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Oh man that sucks ass.
Oh well, good things come to those you wait. Geez I hate that saying.
Hope it comes soon buddy.

Doc
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Old 11-18-2001, 09:11 PM   #11
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me too

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Old 11-18-2001, 09:52 PM   #12
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Lightbulb Pod Filter

Fellas,

The fluttering sound you talk about sounds like the noise most pod filters make when you back off before full throttle (ie before the BOV opens fully). I have a GFB BOV and I never heard that sound until I got the Pod filter installed. I have also heard cars with stock BOV and Pod filter making the flutter, and mine definately is the filter so maybe that's it.....


Brett
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Old 11-19-2001, 01:31 PM   #13
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SOmeone correct me if I'm wrong but the fluttering is actually compressor chatter,

eg all the air is backing when the throttle body shuts and slamming into the compressor wheel. U tend to get it in aftermarket BOVs because they dont open unless you really cane it.

Er.. oh and its also bad for the turbo.

But the blitz ones flutter.. I dunno why.
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Old 11-19-2001, 02:01 PM   #14
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ok if the fluttering noise isnt a sequential BOV then what is the difference between a Normal BOV and a sequential BOV (i always thought you got that noise coz the BOV let the pressure out in stages with a sequential BOV)
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Old 11-19-2001, 08:12 PM   #15
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A sequential BOV works diffrently to ya normal BOV. It has 2 cylinders in it for one, and I think correct me if I'm wrong (has happened before) that it pulls the valves instead of the traditional push type.

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