Quote:
Originally posted by D.Blake
Lets see, a spring hold s the wastegate closed - they have been known to break or the shaft to temporary bind. As far as what opens it, I am at this point unsure.
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Bleed air pressure from the compressor side of the turbo opens the wastegate against the wastegate spring pressure. A hole or compromise in the wastegate hose allows the pressure to be vented to the atmosphere, effectively preventing the bleed pressure from forcing the wastegage open as designed and consequently resulting in an unintended increase in boost.