Are you sure this is not just the turbo noise of the diesel engine.
We have an FRV 2.2cdti and i remember someone posting about a whistling noise on acceleration which is a characteristic of the way the Honda turbo works. Unlike other turbos that only kick in at certain revs the Honda's is designed to give a far smoother boost across the rev range so i assume it runs a lot longer and you notice it at lower revs when the engine is running more quietly.


