When compressed air has nowhere to go, the turbo’s rotational speed drops rapidly, and it tries to push against the wheel. Closed throttle flutter on modern turbochargers can cause premature wear, but it is unlikely to result in a significant reduction in turbocharger lifespan.
Stutututututututututututututututututut
These devices, sometimes known as diverter valves, have nothing to do with boost control. When you swiftly lift off the gas pedal, you’ll hear blow-off valves and diverter valves. When the throttle blade (the flap that rotates when you move the gas pedal) shuts, they release boost pressure. The swiftly moving air escapes through the blow-off valve because it has nowhere else to go. A basic valve with a spring to seal the valve and a vacuum reference from the intake manifold are used in these devices. The BOV opens when there is vacuum (no boost) in the intake manifold compared to the rest of the intake system.
Is there a sound made by wastegates?
Turbo flutter, also known as compressor surge, is commonly referred to as “wastegate chatter,” however it has nothing to do with the wastegate. Compressor surge occurs on the compressor side of the turbocharger, where outside air is sucked in and compressed for consumption by the engine before being used on the turbine side, where exhaust gases spin the turbine wheel to drive the compressor.
The fluttering sound you hear when you quickly close the throttle is the sound of the turbo trying but failing to force air into the engine, causing the compressor blades to ‘chop’ through the air. More information on this phenomenon can be found here.
What causes turbos to whistle?
The turbo whistle is the sound of the compressor inside the turbocharger accelerating up (also known as “spooling up”) as you drive up the rpm range, which is why it occurs at the boost threshold (when the turbo starts to kick in).
Is turbo flutter beneficial?
When you step off the gas pedal after reaching full boost, turbo flutter, also known as compressor surge, happens. While the engine’s airflow is cut off, the turbo’s pressure is still present and hunting for a way out.
Because the sole path of least resistance is directly back through the turbo, turbo flutter is caused by backpressure.
The blow-off valve is a component that most manufacturers use to eliminate turbo flutter (BOV). However, if you start tinkering with your setup, such as installing an aftermarket BOV with a firmer spring or removing your blow-off valve entirely, turbo flutter can occur when pressure forces its way back through the turbo.
Despite the fact that turbo flutter makes a lot of noise, it has no effect on performance! Backpressure after you release the throttle is the reason for this. In other words, turbo flutter occurs after the engine has completed its task.
The Role of a Blow-off Valve vs Wastegate
Many people mix up blow-off valves and wastegates, although while they look similar, they serve completely different purposes and are used for entirely different reasons.
Blower-off valves, as previously stated, are used to eliminate turbo-flutter. They’re located on the turbo’s intake side and are generally closed. When a BOV detects too much pressure in the intake past the turbo, it opens up and lets it out.
This pressure is either vented into the atmosphere or redirected back into your vehicle’s intake, depending on the type of BOV in question.
Meanwhile, wastegates on the turbo’s exhaust side prevent it from producing too much boost. Once the turbo reaches the desired boost level, they direct exhaust pressure around the turbine inside the turbo.
While both wastegates and blow-off valves channel excess pressure, the difference between the two is where the pressure is directed and why it is directed.
Wastegates keep the turbo from creating too much boost, while a BOV keeps the turbo safe from the pressure created by the boost.
What can I do to improve the sound of my diesel engine?
Fortunately, a sound enhancer can make a diesel car seem more athletic. A sound booster is an aftermarket device that duplicates the sound of a sports car’s engine and exhaust. This provides drivers with the sound and aesthetic they desire, regardless of the vehicle they are driving.
What is the sound of turbo flutter?
When people think about turbocharged cars, one of the first things that comes to mind is turbo flutter, or the fluttering/chattering sound that occurs when a driver quickly backs off the throttle, such as when changing gear. That noise may convey to the rest of the world that you have a turbo, but it also signifies a problem. Turbochargers are our allies, and we must not let them down!