Can I install a S5 13B t (engine,ecu,tranny,wiring harness)into a 1988 FC?

 

Easier to stay within series.

 

I agree, but with money of course anything is possible. You really only have two options. One is to get the complete wiring with all sensors from a S5 or go standalone.

 

Yes it can be done, there are plenty of threads on how to rewire S5 into S4 but it is ALOT of work. Now would be the time to go standalone if you ever have plans for it.

You can also run S4 Accesories on the S5 block and avoid rewiring it.

 

I've read somewhere that you gotta strip both engines down to bare block, just leave the flywheel alone, and swap things around. The manifolds, turbos are the good ones too from S5, oh yeh, i think you gotta swap the front cover too, etc. haha
Look for Kevin at rotarycarclub and talk to him. He specializes in rotary engines/cars.