I ended up going with a 2008 RX8 S2 gearbox as it was stronger than the S1 gearbox and newer and cheaper than an RX7S5 turbo box. I considered the gearbox form an RX7 FD but they have a pull style clutch which would mean I couldn't use my existing clutch. The choice of the RX8 gearbox came down to availability, cost and the fact I could use my existing clutch. I think I'll need to change the Diff Ratio from 3.27 to 4.11 to make the gearbox more usable, below is a simulation with a 4.11 Diff and the RX8 Gear ratios shifting at 8000rpm with 15inch tyres. Some of the options Jatco 3 speed automatic box including torque converter $7,000 JK40C/CD transmission from 350/370Z Adapter kits: http://collinsadapters.com/index.php/adapter-plates/mazda-rotary-13b-20b-26b-to-nissan-6-speed-350z-370z-350zhr-370zhr-transmission-adaptation-kit.html https://www.rx7club.com/rotary-car-performance-77/jk40c-cd009-transmission-370z-13b-1090772/page9/ they all seem to need: Does Not include (but requi...
Messings around in the shed