I am swapping a 91 JDM S5 turbo into my 85 GSL, using the S5 turbo ECU, and having trouble getting started on the wiring. I have done alot of searching, but unable to find what i need to successfully wire everything up. Is there a guide or write up for wiring a s5 turbo to a 85 gsl body using the stock s5 turbo ecu? Any help would be fantastic.

 

Life got too busy so my 88 TII conversion is on hold again. You need to download the wiring diagram and familiarize yourself with the parts, wire color code and pin # on the two ECU plugs. Basic for S4 tii, similar to S5.

For dirt cheap, buy some zip tie with labels/tabs and a set of small picks from harbor freight as you will need to group the wires and de-pin any wire that you dont need. Also, buy some colored pen (fine point) and some graphing paper so you can make your own diagram for simplicity.

Theyre group as they share a common wire or somewhat connected to each other.

Main, circuit opening and fuel pump relays
fuel pump, Cas
Trailing and leading coils, injectors
Afm, Tps, fuel pump, Var, boost, atp, water temp, iat and O2 sensors.
OMP