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Old 15-12-2006, 07:54 AM   #1
-dc-
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BOV's

hi guys, i was just trying to find out which blowoff makes a fluttering noise when it opens, i had a feeling that it was a GReddy style one but im unsure and just thought id put a post up incase there was someone here that knew.
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Old 15-12-2006, 08:20 AM   #2
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Pretty much any one does, if the spring is not tightened enough.
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Old 15-12-2006, 08:37 AM   #3
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Hey its not the blow off valve that makes the noise.

The fluttering is the bov not opening , and forcing the air back through the blades of the turbo. Apparently sounds 'cool', but not a good for the turbo.

As Dan said - if you don't adjust the spring properly any BOV will make this noise.
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Old 15-12-2006, 08:52 AM   #4
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yeah i knew it would do that if the spring was not adjusted properly, but i was sure i had heard of one that is meant to do it. i thought it was the GReddy but maybe not then....
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Old 15-12-2006, 10:48 AM   #5
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Get a BOV that is ducted back into the system, the noisy ducted to atmosphere ones are inefficient and can cause lag/decrease performance.
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Old 15-12-2006, 10:59 AM   #6
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Even the stock style Bosch BOVs will make a good loud whoohsing when plumbed back into the intake and the best bit is you instantly remove one reason to get defected!

I find that the Bosch (not great for high boost but good enough for the 14psi Stinky runs) has given better performance than the Turbosmart Type II Vee-Port it replaced. Probably could have adjusted it better but at least it worked.

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Old 16-12-2006, 06:46 AM   #7
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Quote:
Originally Posted by Dogo
The fluttering is the bov not opening , and forcing the air back through the blades of the turbo. Apparently sounds 'cool', but not a good for the turbo.

As Dan said - if you don't adjust the spring properly any BOV will make this noise.
True - alot of old-skool style rally cars in the 80s never had BOVs. The pressure just reverses back into the blades of the compressor when the power is decreased. And only a few types of turbos will accually do this because of the design of the turbo blades. KKR is one of those brands. And it can damage the compressor if the system is not desgin properly.

I have a Mitsubishi Starion fitted with a T3 turbo that makes the flutter. It is currently running 276KW at the wheels and it's not hurting the turbo.

Ryan
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