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sorry didn't know where to put this post. though id place it here because it normally happens after a truck pulls at the truck pulls. But what is turbo back spooling? does the turbo actually spin back the other way?
 

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you are probably refering to some "chatter" when you go from full load full boost to no load. Very similar to turbo surge. All that turbo rpm while making boost takes a second to bleed off and the compressor side of the turbo is still trying to pump as it slows down. It doesn't turn backwards. Just makes odd noises as it slows.
 
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