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Why do performance turbos make that sound?

Old 05-09-2007, 03:42 PM
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Why do performance turbos make that sound?

I have noticed from watching a few videos that the high end turbos make a noise when the boost drops, why??
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Old 05-14-2007, 12:51 PM
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Does no one know??
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Old 05-22-2007, 12:58 PM
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do you mean the sound of the blow-off valve? that is the pressure being released to prevent the turbo from overboosting. this often happens between gear changes as the RPMs drop from gear to gear. you don't want to keep the turbine boosting and boosting and boosting else it will blow up.
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Old 05-22-2007, 09:06 PM
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OOOOOHHH, ok thanks for the info.
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Old 06-26-2007, 09:07 PM
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there is a difference between a diverter and blowoff value.

Last edited by k4site; 06-26-2007 at 09:14 PM.
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Old 10-25-2007, 09:49 PM
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yes, a diverter re-routes the air after the compressor usually back into the inlet of the compressor. Blowoff valve is blown into the atmosphere
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Old 12-05-2007, 03:59 PM
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is one better than the other?
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Old 01-16-2008, 01:52 PM
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Originally Posted by *Chris* View Post
is one better than the other?
Depends on the application...
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Old 02-19-2008, 01:19 PM
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there are two basic types of Blow off Valves (BOV's

Vent to Atmosphere (VTA)

and

Vent to Intake (Sometimes VTI)


VTA gets that ricey sound often found in movies. VTI is not very good with stock intakes and stock air metering devices. They tend to work better with stand alone ecu's or a properly functioning speed density air sensor

All blow off valves make a sound, usually with stock intakes it is masked, but even a VTI will make a noise that is audible in the cockpit if there is a CAI or ram air intake fitted to the car.

I hope that helps
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Old 03-19-2008, 02:38 PM
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Some of the cool sounding cars are running with out a BOV or recirc valves. That gives that chatter sound or the compressor surge of air being forced backwards through the intake system.
Like in this video.
http://www.youtube.com/watch?v=SX0Z9...eature=related
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