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As described by DTA in the manual:
Normal RPM Limit.
This limit introduces a cut on each cylinder in rotation which would be enough to constrain rpm rise in a driving situation. It has a fairly soft action and does not upset the car. Normally set to 250 rpm below the ultimate limit.
Ultimate RPM Limit.
The engine will not go through this limit no matter what the conditions i.e. off load and full throttle. It is, however, fairly brutal in operation and should be set slightly higher than the normal rpm limit above.
The last rocker breakage was absolutely the ultimate rpm limit described above, but earlier back-fires I had that broke boost reference lines and bend butterflies, was definately caused by the overboost function.
AFAIK, both the overboost and ultimate limit (hard cut) actions use fuel cut-off, but again, I am not exactly sure of that as it doesn't say anywhere for sure and I have no other evidence for fuel cut action and in what way it would do so. Ditto for the ignition cut 'map' (if there is one)...
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