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What's this "clacking" noise?

Under hard acceleration and under boost, I hear a brief ratcheting or clacking noise in the engine or drivetrain when I abruptly take my foot off the pedal. I can

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Old 11-20-2012, 12:54 PM   #1 (permalink)
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Question What's this "clacking" noise?

Under hard acceleration and under boost, I hear a brief ratcheting or clacking noise in the engine or drivetrain when I abruptly take my foot off the pedal. I can easily reproduce this when I accelerate hard to about 4-5k RPM and quickly take my foot off the pedal.

It is similar to the brief clacking noise heard on some of the VQ37s on an engine start, which I also hear sometimes.
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