Here's a simple test: press the clutch pedal all the way down then suddenly pull your foot back quickly, as if you were doing a clutch kick. Does the pedal almost chase the sole of your shoe or does it lag behind and slowly reunite with your sole?
The Z has a restriction orifice in the clutch fluid circuit. There is at least one that i know of but there might be a second, in the master cyl but i've never inspected our masters to be sure. google clutch delay valves and you will find heaps of disgruntled owners of other sports or non sports oriented cars. Pretty much the same problem.
Simple braided replacement lines wont fix or eliminate it. To get rid of it you need to remove the restrictor which is in the left fender well and get a custom 4mm braided line made up. Most braided lines for our cars are only -3AN. You'll understand the need for -4 inner diameter hose when you take out the restrictor piece and have a look at the hard line that goes INTO the restrictor. It will make you wonder whyyyyyyyyy Nissan, whyyy? Get the line made long enough to reach the slave cylinder port directly and terminate it with a union fitting rather than a banjo because the inlet to the banjo will probably be 3mm or 2.5mm.
Downside is a slightly heavier feel in the pedal but oh man, it makes a massive difference with quick shifts. Slow shifts will take a tad more concentration
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