_brandon

Yeah thats what I was going to say. My car makes a simular sound but not supercharger whine.. Its a blow off valve sound and I am stock. Checked my lines and everything, it does it like 4-6k when I am shifting. Its not as loud as an actual blow off valve but still audible. Keeps me entertained though..

realblag

Pull the serpentine belt off and check your pullys.

NFR_AP2

For the guys saying noise from speakers...just turn your radio off and see if the noise is still there. Easy way to rule that one out...

gregor_konstantin

my old civic used to have the belt slip when the a/c was on and shifting at higher RPM, sounded like some shitty BOV and kept me entertained. now to a real forced set up... hmmmm

Brndon

I believe its the air flowing over the throttle bodies, My S whistles (actually sounds similar to a supercharger) when you give it a little extra gas than normal. From research thats what people have told me.

CoolGuy094

I just did a amp/speaker install on my car and have the same exact issue, a high pitched whine starting above 3-4k RPM and increasing in pitch/intensity as RPM increases. From the research I have done this morning it sounds like the main cause is a bad ground in the system. Did the shop ONLY install a head unit? Or did they install an amp, sub, speakers, or anything else? If its just the head unit, its possible that the head unit required a ground and they attached this ground to a bad spot. They would need to slide the head unit back out and get this ground running to a better location; a clean, paint-free metal surface on the chassis.

I am fairly certain this is my problem as well, as my amp ground is currently connecting to an existing bolt into the chassis, but I did not scrape the paint/coating off the chassis before securing the ground to it. I will report back after I correct this to let you know if it fixes my problem.

Sylvain2000

Dont just turn the volume down. Turn off your amp to check if the noise goes away.

sro_alvaro

its your diff!

JMChristopher

I did exactly that. I turned the radio volume all the way down and it doesn't make the sound. Even with the volume up it doesn't always do it. It seems to do it mainly the firs time I past 4k-5k rpm. I always wait until the engine is at temp before going over 4k, so I don't know if it is temperature related.

I would post a video, but I need some one to sit in my car and hold my phone and record while i drive it or it doesn't turn out well enough.

Duyx817

lol.. its electrical distortion. i dont think the radio is properly grounded.