surge
It varies depending on severity and engine load. At low rpm and moderate load, mild surge is sort of a fluttering sound, and a gentle fluctuation in engine power. As engine load goes up it gets more agressive.
Severe surge under high load can be an eye opener, it resemble repeated hard fuel cuts, or complete ignition cut outs. It can be very violent and at this level is not good for the turbo or the engine/transmission due to the violent power fluctuations.
Its not a fun experience when it is bad. One tip off that it is surge is that it gets worse in colder weather as the turbo gets to full boost sooner.
At least that's my experience.
Larry
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