CM871 Engine cycle...

[Rig Wrench]

What does the higher boost (40+psi) do that causes the damage to the engine? Particularly the Isx. What is the few extra pounds of air pressure doing to cause damage. I understand overspeeding the turbo, but other brands of engines survive at higher pressures, and competition engines often much higher. I've heard of cm870, 871 and 2250s running upwards of 46 psi for hundreds of thousands of miles, although most of them have fixed vane turbos. I'm in no way endorsing it, just tryin to understand.