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Stick with 12a or 13b swap?


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The plan for my FB after getting her sitting pretty was to get to work on the engine and see how much power I can get out of it. There's two options really. One would be to stick with the 12a. I don't need huge power and it's well capable of what I want. The only issue I see is that production of the 12a housings has stopped. So that would leave me pretty screwed for the inevitable rebuild. I haven't heard of anyone refurbing the used housings, so I presume thats a no-go. The second would be to drop in a 13b. A 13B-REW set up would probably be the easiest to get my hands on, and seems mechanically relatively simple to swap in. But then I would have to deal with the electrics, which I presume isn't so straighforward. I've got visions of the FB lying up for eternity because of some botched wiring. But if it did go right, then what a sweet set up that would be. Any one have any advice? I think I'd prefer to stick with the carb'd 12a set up and not have to deal with the hassle of the electrics. But then again I don't want to pour a rake of cash into the 12a only for it to go pop and not being able to find the parts to rebuild it!

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Re: Stick with 12a or 13b swap? get it on the road first with the 12A, then modify it in stages, otherwise it might never be on the road seen too many cars over years not get on the road because of too many mods/ideas done at once personally 13B, i have a FC 13B 6-port in a S3, FC 13BT in a S3, FD 13BTT in a S3 and RX8 13B in a S3, all different and good power if you want all the work done contact Rotorworks Automotive in n.i can fit any 13B engine (ported or turbo) into the FB and all the wiring etc also upgrades to suspension/brakes etc

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Re: Stick with 12a or 13b swap? I'm not concerned at all about keeping it original, just as long as its rotary. That's pretty much the only condition. Injection/carb, turbo/NA - they're both achievable with either engine so that doesn't really come into it. I probably would only want to go turbo if I was going for power that couldn't be achieved N/A, so I wouldn't be slapping on a turbo just to make ~160bhp when it could be done naturally aspirated. I guess the idea behind the original question was essentially, would I be wasting my time modifying a 12a as new or good parts needed to rebuild them will inevitably become extinct in the near future? From what I've gathered on here and on the 1st gen owners club, common sense dictates moving to some class of a 13b would be the wisest choice. So, I think I'll put off the weber carb set up for awhile, get some cash together over the next few months and get onto Glen about what the best options are!

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  • 1 month later...

Re: Stick with 12a or 13b swap? Stick with 12a until you need a new motor. You can then swap in the renesis 13b which will make awesome power and get better fuel consumption than the earlier 13b's with port work to make same power. Of course a bridge port sounds awesome. So it really depends on what you want from the car but if going NA and 200+ HP I think Renesis all the way 9000rpm is amazing he he.

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  • 2 years later...
  • 3 years later...

well i dig this post up again lol, i read through the whole thing but didnt really find my answer. i bought a 1982 fb gx and am looking to swap a 12bt into it. i just have no idea where to start with the swap. is there some where that would have a full list of everything im going to need to make it work? or is there a better swap option to go with? i was also thinking of a 1jzvvti but from what i have found out so far is that no one has done that swap before.  i am very new to this so i dont know alot and it will be the first swap i have ever done. Thank you for any help you can give me!

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