| You should notice a drop in power from just off-idle up to the mid-range. Upper RPM range should be normal power. Nissan designed the Z32 engines the right way, for the upper RPM range. The VTC in our cars actually changes the intake cam timing to optimize for the lower RPM range. When the RPM reaches the upper range, the VTC returns to the "un-modified" setting where the engine is optimized without any cam timing changes. Exception to the rule is at idle, the VTC's aren't engaged. FSM page where this is described (EF & EC-29 and 30) includes a torque vs. RPM graph to illustrate the point.
that is what i found and from my knowledge sounds about right idk if this helps at all but might give you a better understanding of how the system works.
p.s. i dont remember who i got that info from so i cant cite it but it was on this site so a quick search might yield an author if you have more questions.
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