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Message: [QUOTE="CCRICE, post: 475417, member: 5514"] Pretty good description I found. When you get on it hard, drive pressure comes up and boost comes up. Then you let off and the engine drops RPM, there's no more demand for all that air. The boost tries to go back out the turbo, but the drive pressure (usually higher, and thus stronger) still needs to escape. The barking sound you hear is the turbo speeding up and slowing down as air tries to spin the compressor and turbine in opposite directions, trying to find an equalized pressure. This is hardest on the turbo shaft and thrust bearings.(You can actually snap the turbo shaft when the turbo does this). [/QUOTE]

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