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What is creating this sound?

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Old 01-12-22, 10:47 PM
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What is creating this sound?
I was watching this Japanese rotary meet video and this FC had a very unique sound to it. Would anyone know what it could be? I put a timestamped link to the video.
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Old 01-12-22, 11:28 PM
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Blow off valve.
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Old 01-13-22, 09:39 PM
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Perhaps the intake?
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Old 01-14-22, 05:54 AM
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Nope, its only the blow off valve making that shuddering noise on deceleration. It's definitely an aftermarket blow off valve.
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Old 01-14-22, 07:48 PM
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just to be clear, at 17:00 mark where the fc takes off, its lack of blow off valve, what you hear is compressor surge
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