What causes fluttering sound?

When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. This can cause premature wear on your turbo, however closed throttle flutter on modern turbochargers is unlikely to cause a noticeable drop in turbocharger lifespan .2 Eki 2017

If this is the noise that you associate as turbo flutter, then you’re in luck. Blow off release isn’t harmful to your engine or turbocharger in any way . This satisfying, turbocharger-specific noise should dispel any lingering doubts your friends had about what you have under your hood.18 Eki 2021

Turbo flutter, also known as compressor surge, occurs when you step off the accelerator after achieving peak boost . While the engine shuts off airflow, all the pressure from the turbo is still there — looking for somewhere to escape.