So far on my 12a rx7 I've done the following
Weber 45 carb w/Mazdatrix intake, RB header and presilencer, aluminum radiator, Exedy stage 1 clutch, GSL-SE 5spd, Vibrant resonator, dual loop muffler, and msd blaster 2 coils. Plus the plug wires. Im about to have an msd come in (with a 2 step) but im lost after that. Maybe a turbo but idk what size turbo to get thatll only give up to 10psi with my set up. Im gonna have a blow off valve either way but idk jack about forced induction other than more gas more power

 

Air/fuel, spark, compression, exhaust. Sounds like you're on the right track having done the carb/intake, ignition and exhaust. What engine are you running now? The nice thing about the GSL-SE is that you can build a 13b from the best 2nd Gen, 3rd Gen, and some Rx8 parts and you can use your front cover and oil pan to make it fit. Street port 13b with S5 NA rotors (9.7/1), 4-port side housings, rx8 rotating assembly, FD high pressure oil pressure regulator...

But that's big and expensive and might require replacing the intake manifold (or making adapter plates) so... What about suspension and brakes? What are you running there? I've got RB springs and KYB shocks, Hawk HPS pads and slotted/cross-drilled rotors.

Have you taken the car for dyno tuning? That will help squeeze the most power out of your current setup.

​​​​E-fan? Upgraded alt?

I think once you get the MSD installed you can get on the dyno to play with ignition timing and carb jetting and really dial it in.

 

I'm axtually about to buy a rx8 that I'm putting an ls in, just for the 13b. I'm not gonna do much suspension wise I'm mostly looking for power since rotary power isn't the greatest. Gonna throw a gt35 turbo on the 14b but im gonna have to find out what I'm gonna do for fuel since I don't know much when it comes to boost and what I can do with the rx8 13b, seems to be a newer rx8 so I'm guessing it has fuel injection instead of a carb which would be nice with bigger injectors? I'm still super new to the engine platform, will the 12a front plate fit the 13b?

 

Unfortunately the RENESIS engine swap into the FB is crazy complicated and involves a lot of fabrication skills. Almost any other rotary engine would have been easier.

The mounts are very different. It doesn't use a Crank Angle Sensor of the same type as previous generations so you'll have to figure out something for ignition. The exhaust comes out the irons instead of the rotor housings so you'll need a different header. It has a pull type clutch instead of a push-type one so you'll have to swap that. I don't remember if it bolts to the same transmission with the same starter as previous generations - most people I've seen have tried to swap engine, transmission, and ECU/wiring harness all at once.

I don't really know much about the swap, but there are definitely build threads around here with folks who've done it. It's doable, just not simple. Go search around for those RENESIS swap threads and see what you can learn from the folks who've done it before.

If you manage it, you'll be in a pretty exclusive group of folks who've pulled it off. Good luck!

 

All 13B rotary engines from '84 on up (RX7 and RX8) are fuel injected.

Yes .. the 12A front cover will fit a 13B or a Renesis 13B .. however both engines are physically longer than your 12A engine so you will have to be a little creative with the front mount. You may run into issues with a stock 13B Renesis oil pan interfering with the rear steering system of your RX7.


You may compromise the reliability of a 13B Renesis when adding a turbo due to the unique design of the exhaust ports.

As others have mentioned, a Renesis 13B swap is more complicated than a 13B swap from an RX7. You can simplify the install if use a side draft carburetor vs. the advanced intake and fuel injection system used on the Renesis 13B.

If your ultimate goal is to go turbo .. then try to start with a 13B from an RX7.