turbo flutter

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onlinejames

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old d40 06 had a turbo flutter you can hear, now with the 06 hilux turbo diesel there is no turbo flutter at all
what causes this flutter noise
both have snorkels and 3 inch exhausts
 
Turbo flutter is usually heard on a petrol engine when you close the throttle on boost; eg. on gear changes, or when the turbo is trying to supply more air than the engine can ingest. Pretty weird to hear it on a diesel as there is no throttle unless there was something wrong with it?
 
Flutter might not be the correct word
Once you take your foot off the accelerator it makes a noise
 

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