in my friends car (89 turbo supra) i know its not a honda, but it relates to the turbo... at full throttle and full boost, the turbo makes a weird noise, kinda sounds like a mouse, like a squelling noise. Does anyone know what could make this sound? if its not at full throttle, it doesnt make the noise, and its just started recently. any info would be greatly appriciated

 

check for shaft play.