Bad wheel bearing or outer CV joint I bet. I'm replacing a wheel bearing ATM after getting a vibration through the brake pedal. I thought it was a warped rotor but I can shake the tire a bit. Here's a quote from the bearing replacement how-to. It sounds similar to your problem.
quote=Ray] whirring, buzzing, or metallic grinding noise on one side of the car.. predominant when turning the vehicle, to shift the weight on to THAT BAD bearing (ex. left turns will make the right one sound louder, or appear... and vice versa.. if you make a right turn and hear what some people call "an airplane engine" sound, then your LEFT bearing is probably gone.
To test.. jack the car up enough to take the tire off the ground, and see if there is any play in the tire (up and down, etc.. if you can wiggle the tire.. EVEN A LITTLE, it is a bad bearing.)
Ray
