To the best of my knowledge, a rev limiter and a fuel cut-off are the same thing. Your stock 350Z redlines at 6600 rpm, and the fuel cut-off interjects at that point (or very shortly thereafter). Hitting it is a little abrupt, but it won't hurt anything. I have my rev limiter / fuel cut-off set at 7100 rpm, using the TechnoSquare ECU flash.
here's my assumption of a rev limiter, it prevents going past a certain rpm. i know in my old prelude i had an msd ignition that would let me hit the limits and you can just hear the rpms bounce back and forth hitting the limit. prior to this the prelude had a fuel cutoff when you hit it, it almost completely shut's down for a brief moment (loss of power).
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