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02-06-2018, 11:53 AM | #1 |
Brett
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Escaping/ Compressed Air Noise
Hey guys. I wanted to revisit this. I've been looking to figure this out for months now and haven't been able to find anything. Since about late October I've been hearing a noise like compressed or escaping air whenever I'm in motion. Also, when shifting above 3.5K RPM you can hear a blow off valve or release of air type noise. Funny, because the car is completely stock and has no turbo. I've checked the intake and even went as far as deleting the sound tube to see if it made a difference, and it did not. No exhaust leaks either..
Bad vacuum line, maybe? Maybe drivetrain related? |
02-06-2018, 12:15 PM | #2 | |
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02-06-2018, 02:01 PM | #4 |
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I hear it in my 2017 BRZ MT. It's totally stock.
I can only hear the noise when loading the engine, not at steady state. I had my rear seats down and it sounds like it coming from the rear of the car, so I was thinking it was from the exhaust. Try driving with your rear seats down and see if the noise is more pronounced. |
02-06-2018, 02:04 PM | #5 | |
Brett
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02-06-2018, 04:33 PM | #6 |
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I hear the same noise from the front of the car, but I noticed it after I installed headers. It happens at WOT and when I rev it. I don't hear it at idle. I also have removed the sound generator tube. At first I thought it was a install problem with the headers and I had a leak, but after a rather lengthy inspection I couldn't find any exhaust leaks.
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02-06-2018, 04:35 PM | #7 |
Brett
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02-06-2018, 07:06 PM | #8 | |
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I can't imagine the driveline making a sound like that ..... I might suggest you re-check the intake for a lose clamp, lose hose, split hose or something else wonky. Maybe your NOS is leaking ...... humfrz |
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The Following User Says Thank You to humfrz For This Useful Post: | DaBoBo21 (02-06-2018) |
02-06-2018, 07:16 PM | #9 |
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I have an air like sound under load but that’s because I have a leak between my header and over pipe. Took a while to isolate it but it looks as if the flange is bent a little. Spray it with soap and it bubbles on the bottom end of the flange and you can see a gap at the bottom of this flange.
I’ve never noticed a BOV sound on shifts. The only sound I’ve noticed on shifts was a little ingnition knock (sounded more like a click) when doing very quick shifts were I would go back to the throttle very quickly and aggressively. I wouldn’t describe the sound as a BOVish sound though. I solved this problem by taking the transient ignition retard table from the 2017 rom and applying it to my 2013 rom. The 2017 TIR table pulls a lot more timing on transients then past roms. The sound is gone now. |
The Following 2 Users Say Thank You to ermax For This Useful Post: | DaBoBo21 (02-06-2018), gravitylover (02-07-2018) |
02-06-2018, 08:43 PM | #10 | |
Brett
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Yeah, I don’t usually hear the knock these things have, I do know what you’re talking about though. It really is a head scratcher, though. It’s like compressed air being released when I shift above 3.5k. |
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The Following User Says Thank You to DaBoBo21 For This Useful Post: | humfrz (02-06-2018) |
02-06-2018, 11:31 PM | #12 | |
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02-07-2018, 03:26 AM | #13 |
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I've noticed a similar sound when I installed my k n air filter
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The Following User Says Thank You to Jajanken86 For This Useful Post: | DaBoBo21 (02-07-2018) |
02-07-2018, 06:24 AM | #14 |
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I farted once when shifting.
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