i plan to swap out my lil 12a for a 13b in my 1st gen 7.....i need to noe what all i will need. will tranny bolt up from 12a motor and will rear end be able to handle the power? also going from carb to fuel injection i noe i will need a new ecu. i just need to noe the basics. so if u would holla at me a hit me up with some info i would really thank ya.

 

you need the front cover from a 12a or gsl-se 13b, the oil pan from a gsl-se, and either slot the holes or buy the racing beat 13b mount bar thing

 

Not sure what parts you have on hand by your initial post, but if you're swapping in the whole motor, you just need the front crossmember from a GSL-SE...or slot and move the motor mounts. It should bolt right up to the 12a transmission. The trans and rear will hold, but know that they are weaker and will break down sooner than the GSL-SE gear. If you are just piecing this together from a 13 short block, all the stuff that came on the 13B is necessary: exhaust, oil pan, front cover, front mount oil cooler, ECU and entire intake setup (injectors etc). I have an ECU out of a GSL-SE if you're interested. Also, if you're piecing this together, I'd use the intake/Throttle body from a 2nd gen instead...it's worth a few horses.



Good luck!

 

And if you want a simpler swap you can convert the 13b to a carb setup and save a wiring mess.

 

available from mazdatrix as well..

 

From what I've heard, the GSL ring and pinions are stronger than the GSL-SEs. The only real difference in strength I know of has to do with '83-earlier axles vs. '84-85 axles. The later axles are thicker. Realistically a FI 13B doesn't even come close to being able to shred a 12A rearend, so don't worry about it too much.

 

Yeah it's only a difference of +/-35 horses stock, so it can't be that huge of a difference in strength... I meant to be more clear about it not really mattering, but came off like it did.

 

Will the gsl-se's wiring harness plug into a 2nd gen's tps, alt., and other electrical components without trouble?

 

the s4 stuff, yes. s5 pretty much works the same, but the connectors are different

 

I think so.I know 79rx7 was running a SE efi setup then went S4 efi.You could pm him to confirm it.