I know I have my left CV boot cut a little and it causes the normal sound when pulling in-out of parking spaces, but...

When I'm on a "clover-leaf" style on ramp/off ramp regardless of turning direction the car makes a sort of "on/off" rubbing/grinding sound. It's about every other second (not a constant sound) that I hear it, almost perfectly timed.

It happens whether I'm coasting or braking, but goes away once I straighten out the car at the end of the ramp again.

Any ideas at all?