What causes turbo to whine?
What causes turbo to whine? What causes turbo whistle? Turbo whistle is the sound of the compressor inside the turbocharger speeding up (also known as 'spooling up', which is why it kicks in at the boost threshold (when the turbo starts to kick in) as you accelerate up the rev range. Should my turbo whistle? As a general rule Turbo D's dont have dump valves and with almost all standard cars you won't have a dump valve anyway, you MAY have a recirc valve but you won't normally be able to hear it. It's normal to whistle, if it whines...