Hello everyone! Long time lurker but have never gotten around to post that much.
I have a 2012 370Z automatic with 32,000 miles on it. Car has never been tracked and is completely stock. I have noticed this noise coming from under the hood for the last 5,000 miles. I have been told by some people it is normal and others it is not normal. I finally decided to take it in to the dealer last week to have them look at it. I was thinking the worst, like something wrong with the transmission. I got the car back the same day and they told me the transmission was fine but the Power Steering was the source of the noise. Gave me a quote of 1500 to replace the power steering pump and hoses since the cars 36000 mile warranty ran out exactly one month ago. However, the guy told me it wasn't really a big deal and the Power Steering didn't really need to be replaced right away. It is just noisy. He said later down the road it probably would need to be replaced. In my opinion I do not believe the Power Steering is the source of the noise. You can take my opinion with a grain of salt though because I am not mechanically sound. I don't think it is the source of the noise because I was told that if it was the Power Steering it would make the same noise when I turn the steering wheel while the car is on and in park, which it does not make that noise.
So anyway, that is the background. As for as the noise, it is in synch with the RPM's. So maybe this noise is normal, I don't know. I am hoping for some of you guys to chime in and take a listen to the videos I posted below.
Any help would be much appreciated! Thanks, Cameron.
In this video you can hear the noise pretty well from the time 16-30. You can hear it the best at the 28-30 second mark.
370Z Noise Part 1 Video
In this video you can hear the noise pretty well from the time 24-35.
370Z Noise Part 2 Video
In this video you can hear the noise pretty well from the time 34-51.
370Z Noise Part 3 Video