Since the temperature has started dropping now I've noticed a difference in the sounds my turbos are making in the cold. I've got used to the usual whistling noise made by no1 under even the slightest of boost, but recently there seems to be at least another 2 whistles joining in
It's really hard to explain but the other noise seems to be coming more from the passenger side area of the engine side than from no1 itself, and is a slightly higher pitch.
Being an auto it's hard to check exactly where it's coming from as I don't believe the tubbies will spool at a standstill.
It ONLY does this in very cold weather.
There certainly seems to be nothing wrong with the car, both turbos spool quickly, boost is slightly higher due to the colder air, and the car goes like a rocket
Any ideas?