@ Phil. The turbo is that thing just behind the radiator with the big hoses coming out of it .. right?
.. Or have I been looking at the waterpump?
Time for a Haynes manual methinks.
Thing is, the car won't make the noise when revved up standing still .. the motor has to be under some kind of load. I'm sure it's load related as it's definitely louder when you're trying to go uphill.
@ Ratdogfink. Not a screech deffo a hissing. If you've ever sat at a drum kit, imagine rotating the two high hat cymbals against each other ..
Ta
CC