RX-5 question...
 

I own a '93 Miata and I intend to swap a 13b I just purchased for $200 into it. I plan on buying the Lucky7Racing subframe kit (Miata 13B Rotary Mount Kit – Lucky 7 Racing Inc.) so mounting will be no issue. I'm not sure how to run the motor. it is a '91 13b N/A motor that I am having rebuilt. When I am ready to drop it in what will be the easiest way to run this in the Miata? Will running an standalone FMU be the fix-all solution? Also I would like to run a single turbo setup if that makes any difference on how I should run the engine. I also know I shouldn't run boost with the high-compression rotors in my '91 N/A 13b and my idea was to buy and install some T2 rotors (if that's even at all possible) but that's for another post after some research. Hopefully I didn't miss any similar post after using the search function, if i did and you want to link me to it I would very much appreciate it. Also I hope I picked the proper board to post on. The motor is from a 2nd gen RX-7 so I figured this would be the place. Thanks for any and all help.

Well sorry to say but you should have bought a turbo engine and not a NA if you wanted a turbo. The ports are totally different between the two. Turbo having 4, NA having 6. If you want to turbo an NA engine it will take alot of fabrication. Check out aaroncake's project tiina. As for the ecu I would think standalone would be best for such an application.

You can boost a 6 port S5 engine, you need a standalone and either do the fine tuning yourself (the high compression rotors are not as forgiving) or just stay with NA.

Shit, an S5 13b NA in a tiny little light weight car like the miata? I'd be happy with that. You already have a weight advantage and with the 13b S5 NA engine you now have a HP advantage too.

I dont consider my S5 vert slow...it isnt fast but it isnt slow, but I have driven both a miata with a 13b NA and also a miata with a an LS1. Both where HOLY SHIT compared to the much more heavy RX7. If I had my way, I'd have a miata with a 13b NA, but my feet are too big and I am too tall to use the tiny pedals in the little creature.

It's not just the ports which are different between the turbo and NA engine. Almost everything is different between the turbo and NA engine. Off hand, the only parts common between the two are eccentric shaft, water pump, alternator and oil pan. And a few bits of hardware and a few other small parts.

They are, essentially, two completely different engines.

That's not to say you can't turbocharge the NA engine but based on the questions you are asking, I'd suggest sticking with a turbo engine if you want something turbocharged, or stick with the NA if you want to stay NA.

Since you have the NA, why not install it and work out all the kinks in the build. Then upgrade to a 13BT once you have everything running?

this is what i believe to be your best option right now. you're already having the engine built, there's no sense in bailing on it at this point so you've kind of painted yourself in the corner already. chin up though, this way might actually be a blessing for you in terms of learning to tune the engine and chassis.