Turbo use to flutter but now doesnt

[ItwasVTEC]

Hi fellas, I have a 2008 ford focus 1.6 TDCI (110), when I use to come off the throttle my turbo use to flutter a lot, and it was quite loud, but all of a sudden my turbo no longer flutters, all I hear is a whooshing sound when I come off the throttle, the car feels fine, no lack or drop in power, so was wondering if anyone had any ideas ?

 

[ItwasVTEC]

Your wastegate was not working hence the flutter, now its either failed to the point it venting externally hence the woosh or working as intended (depending on how its suppose to sound!) either way best to have a look for any split boost pipes / investigate the wastegate

Hi there, thanks for this, I suspected it had something to do with that as sometimes it wouldn't flutter at all and sometimes it would flutter all the time,