Originally Posted by Call4God

Hey guys, hoping for some feedback on this noise my newly installed s/c is making. It's perfectly rhythmic, and speed increases with RPM to about 2k, above which it either disappears or is drowned out by other noises. It's coming directly from the V3 Si trim unit, and seems to get louder and quieter randomly. I've heard of gear lash, but the videos I found showing this didn't sound quite the same.

Here's two videos trying to capture audio from inside the car and from under the hood.

https://streamable.com/s/3x6zc/misnqz

https://streamable.com/s/u112n/ppcslr


Any thoughts: Just gear lash? Bad bearing? Loose Pulley? Thanks in advance!