I didn't drive it mate. I was only passenger. The Z for what it was performed very well. Considering stock engine, open scroll... Realistically a basic setup. The Z was cracking gates at 4500 rpm in second gear, to be doing that at 3700... I doubt it.
This car had -5's removed and 8374 1.05 bolted in place. I can try and explain how it was. Put all the theories and "I believes" out of your mind and drive it. It's the popping around, doodling around and gear changes that was most impressive. "Big laggy single", think again.