have looked for this problem on other threads but none sound similar?
Have recently bought an astra H 1.9 cdti (150) and noticed at about 2000 revs as the turbo starts to spool it sounds as though what i can only describe as fluttering and then as I floor it at about 2500 turbo whistle normal and loads of boost. This noise combined with the fact that the fuel economy seems really bad at these cruising revs wondered if anyone has any thoughts???