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      08-30-2012, 06:40 PM   #1
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Does anyone hear a whistle sound when letting off the gas? xDrive 35i

Hi all,

I realize I have a turbo car and that a spooling sound is expected, but I'm hearing a repeatable whistling sound almost every single time I let off the gas. This is not a spooling sound really, and doesn't happen during acceleration. Only after. Is this considered normal?

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      08-30-2012, 08:09 PM   #2
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When you let off the gas, the bypass valve closes and boost is evacuated out the intake. The N55 has some fairly nice turbo noises, although I'm sure some people don't like it.
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      08-30-2012, 08:13 PM   #3
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That's the bypass valve. Similar to a blowoff valve but it gets recirculated. If you tune the car you'll hear it more
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