This may be something very obvious and turn into a "doh" moment, however, being unfamiliar with anything turbo, thought i had better ask.

Had a 55 plate vRS for 6 months now, very happy so far.

I have noticed recently, that after accelerating moderately, and with foot of the gas, there is a very faint high pitch whistling noise coming from engine. It can last anything up to 5 -8 seconds.

This is about 3-4k revs with foot totally off the gas.

Is there any explanation for this? any ideas much appreciated.

Its boredom; with your foot off the loud pedal, the engine isn't doing anything exciting, so it whistles to keep itself amused.

Ok thanks for that,

Anyone else any thoughts? any new noises from engine do concern me!

thanks