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C4RBON · 08-30-2016, 07:36 PM

My 2015 BRZ makes this noise occasionally. The first time I heard it was the day after I bought the car (new). After two years, it has become more frequent (or at least I notice it more).

The condition it happens most repeatably is after I've been cruising on the highway for a long time (like an hour or longer). If I exit the highway, the next several times I accelerate (at a light or stop sign) under moderate load, it makes this noise. The noise starts between 3000 and 3500 rpm and goes away above 4500 rpm.

- It does it with 91 or 93 octane, regardless of brand.
- As someone else said, it sounds like it is coming directly in front of the driver but not inside the cabin.
- I don't notice a loss of power, but I lift off the throttle when I hear this.
- After the car cools down (like overnight) it won't do it again for a long time (until I'm on the highway for a long time again).
- Ambient temperature doesn't seems to matter, it happens in the summer and winter.

[ame="https://www.youtube.com/watch?v=aeVtZQNu_Ss"]BRZ Engine Noise 3500-4500 rpm - YouTube[/ame]

I remember searching on here two years ago after this happened the first time. It appears there are a few of us now with this issue. I brought my car to the dealer today to look at it, and they couldn't reproduce the noise (no surprise).

08-30-2016, 07:36 PM	#30
C4RBON Senior Member Join Date: Mar 2011 Drives: '15 BRZ, '19 GTI Location: USA/Iowa Posts: 204 Thanks: 79 Thanked 163 Times in 79 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Me Too... My 2015 BRZ makes this noise occasionally. The first time I heard it was the day after I bought the car (new). After two years, it has become more frequent (or at least I notice it more). The condition it happens most repeatably is after I've been cruising on the highway for a long time (like an hour or longer). If I exit the highway, the next several times I accelerate (at a light or stop sign) under moderate load, it makes this noise. The noise starts between 3000 and 3500 rpm and goes away above 4500 rpm. - It does it with 91 or 93 octane, regardless of brand. - As someone else said, it sounds like it is coming directly in front of the driver but not inside the cabin. - I don't notice a loss of power, but I lift off the throttle when I hear this. - After the car cools down (like overnight) it won't do it again for a long time (until I'm on the highway for a long time again). - Ambient temperature doesn't seems to matter, it happens in the summer and winter. [ame="https://www.youtube.com/watch?v=aeVtZQNu_Ss"]BRZ Engine Noise 3500-4500 rpm - YouTube[/ame] I remember searching on here two years ago after this happened the first time. It appears there are a few of us now with this issue. I brought my car to the dealer today to look at it, and they couldn't reproduce the noise (no surprise).