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.
Is turbo flutter harmful?
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.
Why does my turbo makes a fluttering sound?
Essentially, the noise is caused by what is known as “reversion”. When a turbocharged vehicle builds up boost, and the driver backs off the throttle, the throttle body snaps shut, but the turbo is still spinning, trying to compress air.
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Why does my turbo flutter when I accelerate?
That fluttering noise is the sound of a turbo operating in compressor surge, as the compressor ‘chops’ through the air rather than pushing the air into the engine. Love it or hate it, it’s doing nothing good for your turbocharger performance or reliability. This is where a blow-off valve comes into its own.
What makes a car go Stustustu?
This could mean one of two things, either your wastegate or blow-off valve isn’t releasing a sufficient amount of pressure or you are running too much boost on the stock turbo. Tuning down the boost or fitting a higher pressure BOV can remedy the situation and return the ‘whoosh’ sound.
What BOV makes the flutter sound?
In short, flutter is the sound of a turbocharger trying to push air. However, failing due to closed throttle. Therefore, it dramatically increases the load on the bearings of the turbo. If it occurs at higher engine loads or boost levels, it can cause premature wear to your turbo.
Do Wastegates make a sound?
External Wastegates are responsible for turbo flutter.
That fluttering sound, which typically occurs when the throttle is suddenly closed, is the sound of the turbo trying to push air into the engine but failing, so the compressor blades ‘chop’ through the air. You can read more about this phenomenon here.
What does turbo surge sound like?
To the driver, compressor surge is apparent as a fluttering or repeated “choofing” sound, typically when closing the throttle.
What makes a turbo surge?
Whenever the breakdown of gas flow takes place in the turbocharger, a reversal of scavenging air occurs through diffuser and impeller blades into the blower side which causes surging.
What does a BOV sound like?
If a car is making a fluttering noise when venting at high rpm and boost, then the BOV isn’t doing its job. Contrary to popular belief the noise is actually emitted from the turbo, not the BOV itself.
How do you make a turbo whistle with your mouth?
With your mouth slightly open, place your tongue on the roof of your mouth, just behind your two front teeth. You should hear a high-pitched sound. The more you pucker and the harder you blow, the louder the tone. Puckering and widening your mouth as if in a narrow smile will produce different tones.
What’s a wastegate do?
What does a wastegate do? The wastegate’s job is to divert excess exhaust gases away from the turbine – controlling the speed of the turbine and preventing it from spinning too fast. By controlling and limiting the speed of the turbine, the wastegate regulates the boost pressure provided by the turbocharger.
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What is turbo wastegate?
A wastegate is a valve that controls the flow of exhaust gases to the turbine wheel in a turbocharged engine system. Diversion of exhaust gases regulates the turbine speed, which in turn regulates the rotating speed of the compressor.
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What is turbo stall?
A compressor stall is a local disruption of the airflow in the compressor of a gas turbine or turbocharger. A stall that results in the complete disruption of the airflow through the compressor is referred to as a compressor surge.
Why do superchargers whine?
Superchargers are driven by a belt connected to the engine crankshaft. This means that they spin at a high rate of speed, which can create a whining noise. Another reason for the characteristic supercharger whine is because of the way air moves through them.
What makes the Sutututu sound?
When there is vacuum (no boost) in the intake manifold relative to the rest of the intake system, the BOV opens. It’s the BOV that makes the signature turbo sound (“pssst”; “sutututu”), not the wastegate.
Does a BOV add HP?
The MS3’s bov leaks at stock boost levels. Going aftermarket does not add any more power, but stops the loss of power due to the leak. This is not the case on our cars.
What does harder and softer mean on a BOV?
It is for the spring stiffness. Softer = less vaccum to actuate the valve; Harder = more vaccum to actuate the valve. So in essence the more boost you are running the harder the spring needs to be set at. In some BOV’s you have to just swap out the spring to a different stiffness spring to control it.
Can you put a BOV on an automatic?
The purpose of a BOV is to hold boost pressure better during WOT applications because the stock system when tuned can be prone to leak. On an automatic car you wont hear the BOV as much because an automatic car holds boost between shifts.
What is a screamer pipe turbo?
A screamer pipe is a type of exhaust configuration fitted to some automotive turbocharged petrol engines with an external wastegate set-up, which vents the waste exhaust to the atmosphere through a separate un-muffled pipe, rather than back into the main exhaust track. This exhaust setup is known for its loud noise.
Can you run a turbo without a wastegate?
While in theory you could run a turbo system without a wastegate by carefully choosing a turbo that will only reach its maximum turbine speed and desired boost pressure at the engine’s max RPM, it’s really not practical in the real world.
What the difference between a BOV and wastegate?
A blowoff valve (BOV) is similar to a wastegate, except it works on the intake side of the turbocharger. Once a certain level of pressure is reached, the inlet air opens a spring, allowing for the intake air downstream of the turbocharger to either vent to the atmosphere or be redirected back into the turbo.
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Does BOV increase performance?
Performance-wise, BOVs can have a slight negative affect in applications such as drifting. When you’re on and off the throttle all the time, releasing all the charged air can hurt throttle response and give some lag. But as a general rule, you’re better off having one.
Is it normal for turbo to whistle?
All turbochargers make some amount of noise – and most people don’t even notice it. However, if the whistling sound gets louder, more noticeable, or changes in any way, it could be symptomatic of a number of different problems, that all warrant further investigation.
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Why use a supercharger over a turbo?
Supercharging Pros: Produces significantly more horsepower than turbocharging. A quick solution to boosting power in larger displacement engines with more cylinders. No power lag as is seen with turbocharging; power delivery is instantaneous.
What controls boost in turbo?
Ultimately, the boost pressure is determined by the wastegate, which on most factory turbos, is integrated into the exhaust (turbine) housing.