Hissing noise
 

Maybe i just didnt notice it before but i started hearing hissing noise when I accelerate at least at 4th gear up. I'm not sure if that's turbo spool but i never noticed it before. It goes away when i take my foot off the gas and i hear the bov go off.

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Was just hoping for someone to confirm or deny if the hissing noise is turbo spool

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If you are at max boost it is probably relieving excess pressure. I have a twin scroll in my JDM STi swap (not a BRZ) and it makes all kinds of noises at many different throttle pressures/rpms. The only time it's not dumping pressure is on the inital acceleration but as soon as the first stage spools up it hisses a little and then when the second stage kicks in it makes a fluttering sound and the when I back out of the gas to shift it dumps even louder. So yeah it's probably normal. If you have a boost gauge you probably notice the noise starts around your max boost point (although there are many varibles).

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Is your car SC'd?

No Turbocharged

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Can you describe the "hiss"

Does it vary in pitch or constant
Could be a minor boost leak
Could be surge


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Constant pitch only when flooring the car above 4k rpm

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If you could take a video it would help, still could be surge or boost leak *minor

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