Horrible Buzzing Sound past 45 MPH
 

Looking for help: Horrible buzzing sound coming from the turbo side of the car. It happens when I go above around 50 mph. Even when I let off the turbo/gas and go into neutral, the sound continues until I slow down. What is causing this problem?

Background: About a month ago I overheated pretty badly into the red due to an upper rad hose. Coolant level sens or was disabled by a previous owner, so that didn't help me catch it sooner. Had the car towed home and since then replaced all the coolant hoses, added a second oil cooler, and removed emissions and added a pulley kit. I also blocked off the double throttle and other sensors on the UIM, replaced the radiator, and installed Widefoot Swaybar Brackets. I don't know if any of these things could cause the problems I'm experiencing.

Please help, thanks!

No vibration associated with it? Possibly something along the wheel hub?

I know it's strange, but it doesn't make sense to me either. The car was running fine before the month it sat. I'm not sure if the wheel hub is the case.

sounds like just something is loose and vibrating. Just check for loose screws or anything of that nature.

This car is a pia...

wheel bearing, that's what i would check. is it kinda like a humming like your tires are worn or flat?

Not like a humming, almost sounds like a duck screaming, haha.

I'll test it out more today. Yesterday I had bubbles in the system so I wasn't able to run it for any period of time. So far it does sound like a wheel bearing.

maybe the air hose? Could be a vac leak as well.

Yea it was a vacuum leak. I was rechecking all the couplings due to the strain I put on them with the new geometry and there were a couple clamps that had sliden off.

Thanks for the help everyone I appreciate it!

Glad you figured it out!