![]() ![]() We can make our turbos flutter by simply removing the BoV and blocking the pipe, or you can take a slice of coke can and slip it between the BoV and the pipe. I have zero clue what is true, not true, half truth, or any other choice on the spectrum. So there are a couple of public thoughts on this ĭebate ranges from "air battling on your blades bad mmkay" (which does make sense), to "turbos built today are structurally superior to those of the past", to "wont hurt smaller turbos, but bad for big boy turbos". I recently noticed that if Im in a high gear and I give it a bit of throttle and let off as it starts getting into boost, I hear a bit of quiet fluttering. It is the sound of the returning air being forced back through your turbo and chopping against the blades. Yup - reverse course all the way back out your intake. When the unused pressurized air has no exit point, well, it just goes back to whence it came from. ![]() Upon changing gears in the vehicle, they can hear a flutter in between the gear shifts, which. This is caused on a turbocharged system without any blow off valve type present. When installed with a turbocharger, players can hear a decent turbo flutter coming through the car. ![]() You've heard it in movies and some of you may not have realized what it was, or mistook it for a BoV sound. Yea this made me laugh too, never heard it called that, I was like "The what sound?" It actually kind of makes sense I guess. However, failing due to the closed throttle. Then we have the "flutter" or as the internet coins it, the "stustustustu" sound. The flutter is a turbocharger’s sound as it attempts to push air. If the BOV cannot flow enough air, the pressure increase in the intercooler piping when the throttle is closed can still be high enough to cause compressor surge.Turbocharged cars make two distinct iconic sounds.Ītmospheric Blow Off-Valve this creates the iconic sound of a single sharp release of pressurized air. Flow is another important specification of a BOV. told me they had something like this and he said it was real bad turbo flutter and he had to adjust the linkeage arm from the wastegate. This will also reduce the deceleration of the turbocharger as the turbo does not need to work against a closed throttle. This will vent the excess pressure build up and allow the turbocharger to continue to flow air. During a gear change the BOV will open up due to vacuum and boost pressure. This deceleration will also reduce the boost response of the turbocharger when the throttle is reopened as the engine will need to work harder to increase the turbo speed back up to operating RPM.Ī BOV is designed to maximize boost response and eliminate the problems associated with compressor surge. a small amount of fluttering at low engine speeds and throttle movements is negligible.Īt high turbo speeds and high pressures, compressor surge during a gear change can be damaging to the bearings of the turbocharger as the deceleration rate of the turbocharger is high and the reversal airflow through the compressor is high. At low turbo speeds and low pressures, the deceleration of the turbo and the load on the bearings is low, i.e. The result of this reversal flow of air is the immediate deceleration of the turbocharger and a high load on the bearings which support the compressor/turbine shaft. When it reaches this limit, it cannot flow the air anymore and the built up air pressure inside the intercooler and pipe begins to flow backwards through the compressor which is trying to flow air forwards. The pressure within the intercooler piping continues to increase until the compressor reaches its pressure limit. This results in a large pressure spike as the turbocharger is still trying to flow air due to the inertia of the compressor and turbine but there is nowhere for the air to go as the throttle is closed. When a gear change occurs, the throttle which allows air to flow into the engine is closed. Started getting worse fuel economy and making a funny fluttering sound from the turbo when shifting or letting off the throttle after being under load. Under acceleration, the turbocharger is flowing air and the engine is ingesting the air which means the air that the turbocharger is pushing is going somewhere at a certain pressure. Car has been running fine for at least 100k now and nothing has been changed other than normal maintenance stuff. The most common time which compressor surge occurs is during gear changes on a manual transmission car. The fluttering noise is the sound of the compressor “chopping” through the air rather than pushing the air. Compressor surge is a phenomenon where the compressor cannot increase the pressure of the air it is pushing and results in the reversal flow of air through the compressor. ![]()
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