some good news, more bad news...

[Dave]

The pressure sucking in all that piping, and then making it collapse, and the sudden stall of air directly relates to the pressure on the thrust bearing. All turbos are designed in equilibrium so the axial tension on the shaft should be within a tolerance and designed to be close to equilibrium (both wheels try to pull away from the turbo housing but the shaft keeps them in). If you have a sudden restriction on one side it massively upsets that balance in the turbo and causes much quicker failure because that equilibrium isn't maintained and its all transferred onto the turbo bushes. This is why turbo stalling/chatter kills turbos too, alongside damaging the compressor wheel fins. Regardless of application, moving something very fast and then stopping it quickly will cause damage, this is exactly what happens with turbo stall, the same as throwing an egg at the wall. Grrr I miss mechanics