I'm sure this has probably been asked many times before, but here goes.......
How damaging is compressor stall (referred to incorrectly as waste gate chatter, BOV chatter or compressor surge by many) to a modern large BB turbo from a reputable manufacturer?
I ask because I love the 'chattering' noise created when you let off the throttle, but when you think about what's actually causing the noise - charge air 'bouncing' back off of the closed throttle butterfly plate, if the BOV can't then flow enough charge air to atomsphere quick enough, it then backs up, stalling the compressor wheel before reverse flowing out of the intake. That surely can't be good for a turbo, as there must be large levels of mechanical stress involved (to bearings, shaft and compressor wheel / blades)? Question is, are newer aftermarket turbos strong enough now to cope easily with these stresses and thus make their consideration irrelevant?