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**Izo Azlion** · 09-04-2008, 03:01 PM

Its a Blow Off Value, or "Dump" valve.

This occurs as air builds up to be used by the Turbo, and as he changes gear its "blown off" or "dumped."

It can be done much more silently but some of them make a pretty nice sound.

That said, there are lame ass speakers you can get put inside the bonnet, which will make the same sound every time you shift gears.

What car is it, out of curiosity?

09-04-2008, 03:01 PM	#2 (permalink)
Izo Azlion Loyal Member Power tuner Car: Golf GT TDI Sport Join Date: Oct 2007 Location: Manchester Posts: 235	Re: What causes this sound?... Its a Blow Off Value, or "Dump" valve. This occurs as air builds up to be used by the Turbo, and as he changes gear its "blown off" or "dumped." It can be done much more silently but some of them make a pretty nice sound. That said, there are lame ass speakers you can get put inside the bonnet, which will make the same sound every time you shift gears. What car is it, out of curiosity?