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Forced Induction Turbo, Supercharger, Methanol, Nitrous


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Old 09-12-2020, 01:17 AM   #1
j_ros94
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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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Old 09-12-2020, 01:18 AM   #2
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Was just hoping for someone to confirm or deny if the hissing noise is turbo spool

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Old 09-12-2020, 10:51 AM   #3
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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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Old 09-12-2020, 03:45 PM   #4
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Is your car SC'd?
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Old 09-12-2020, 04:09 PM   #5
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Is your car SC'd?
No Turbocharged

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Old 10-07-2020, 07:31 PM   #6
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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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Old 10-07-2020, 08:01 PM   #7
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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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Old 10-07-2020, 08:02 PM   #8
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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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