I've suddenly developed a new noise when the car is under load (ie - not at idle) at around 1500-2300 rpm.
Where I used to get a hint of turbo whistle, I now get a noise which can only be described as a whirring/whooshing noise. It sounds like something spinning and it only does it when accelerating, and stops as gradually as it starts.
It's only started in the last day and the performance doesn't appear to have altered much, although (and it may just be my imagination) the turbo doesn't seem to be following itself through on gear changes as much as it used to and the engine appears to last a fraction of a second longer after I flick the key off.
What could it be? I'm almost certain it's something in the turbo area, but I'm not well versed on the workings of turbos, so I don't really know what to look for.
It's a 2002 S40 1.9 TDCi which has done 61000 miles with a remap at 60000 (if that makes any difference).
