I got the Tilton Rally Clutch and 8 lb. Flywheel today at Performance Nissan in Duarte, Calif. It revs really fast now. Very hard to launch from a dead stop in 1st gear, but I have only driven it for less than an hour, I am sure I will get the hang of it. Once you are rolling, it bites hard, and allows very free revving. A definite improvement over the JWT 14 lb. Aluminum Flywheel and stock clutch I have had for the last 5 months. BTW the stock flywheel weighs 31 lbs.
If the Z is your daily driver and you have to commute in heavy traffic, you definitely don't want the Tilton clutch and flywheel. Once you are rolling, it's great. But from a dead stop, it is very hard to launch the car smoothly, and easy to kill the engine. I need more practice and I'm sure I will get the hang of it better, but it will never be as smooth as the stock clutch.
You might try JWT flywheel and stock clutch, which I had for several months.
I commute in my Audi S4, which is smooth as silk, most of the time.
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