The 8 engines a lot more reliable than the 7
there isnt anything unreliable on the 13b (rx7 fd engine) the problem people have is that they dont treat them right, the engines use oil to run, as well as lubrication its burned its injected in to the block in to the same path as the fuel, people run them low on oil and dont do oil changes! there are 13b lumps over 100k miles on mrc and fduk, also you run them on mineral oil, not semi or fully synth! that clogs up the rotors and wears them quick! so 12 quid for 5l of oil which will do a change and leave you loads to top it up over the next 3k miles isnt really much tbh...
the renesis engine from the rx8 is basically the same engine, still burns oil, (people who dont know about wankels seem to think this is a problem but its not) doesnt have 2 turbos strapped to it so less to go wrong but not as much power...
the 22b with a single turbo and massive ports is where its at! from the mazda cosmo, tripple rotor goodness!
and see with a wankel, if you put a bigger turbo on it, and its to laggy, you split the engine (you have 3 plates, 2 housings and 2 rotors) you then port the exhaust ports in the housings and it will spin up a massive turbo by 2k rpm! will be loud as hell and sound sexy as f**k and will be quicker than you can s**t when you had a dodgy curry!