I'm not surprised, everyone agrees Datsun/Nissan made a mistakes with the amount of weight they put on the s130 chassis and keeping an engine that was first produced in 1968. The RX7 was a response to the Z, not the other way around.
That was the downfall - weight. If they had kept making the old 260, it would have been more competitive. The 280 was the downfall, and the 280ZX was the nail in the coffin.
"Racing is life. Anything before or after is just waiting." - Steve McQueen