RX-7 was a fine car! Except, it tended to be difficult to find anyone that could work on the engine.
Did you ever have problems with finding mechanics with the proper knowledge?
It's not that complicated but I know someone who was a Mazda tech and a friend from school had one and he knows that engine inside-out. Mine had a sticky deceleration rod and it sounded like an exhaust leak- we both learned something on that one but I don't think the gasket cost more than ten bucks and a little of my time. The Mazda tech fixed it when I took it to the dealer. Other than that, I replaced the starter, brakes and tune-up parts.
The friend from school had a '79 GS model with the 4-speed and he started reading 'Rotary Rocket' magazine, which put all kinds of crazy idea in his head. He found a front clip with the engine and trans from a GSL-SE, which had the 13B engine (1.3Liter injected) and 5 speed, so he went to work making all of that fit- needed new transmission and motor mounts and he installed a 13lb flywheel to make it MUCH more responsive. He removed the injection and sold it to a company called 'Rotary Engineering' in California, replacing it with (IIRC) dual Weber side-draft carbs, and he added a fuel pressure regulator to the electric fuel pump from the injection system. He then lowered it a bit and installed better shocks, Pirelli P6 tires, air dam and rear wing before his brother painted it with Imron in Porche Garnet like the 944 in the photo.
https://cdn.bringatrailer.com/wp-content/uploads/2016/11/s-l720-527-620x412.jpg
That car hauled ass! He was on the freeway and went up against a Camaro I had worked on (stereo system) which had a Paxton low rise blower on an Edelbrock intake and some other work done to it, to give it 468 HP. The guy in the Camaro was impressed.
I went to see someone play at a local club and at one point, my friend & I started talking about insurance and what a scam it is. At some point, I said "Now watch- I'll walk outside and my car will be gone".
I'll never do that again.
I really liked that car.