I took my vehicle in for the cam-belt service drove back home and noticed this whine/supercharger noise which increases in loudness when I press down on the throttle.
I suspect the cam-belt is too tight but the mechanic says that can't be because the tensioner is self tensioning.
What could the problem be ?
I took a video of the sound see video
Update: The vehicle is a 2010 model with 67000 odd KM on the clock. Also, as others have stated, the vehicle is turbo charged.
Update 2: Looks like it may be a bad belt tensioner. New one is being ordered.