So the story is that I have a 94 gsr engine, trany, ECU and all the wires i'm trying to put it into my 98 CX hatch, don't know what I will need in wiring. I have the harness and ecu from the grs motor, what else do I need other than a 99 SI front motor mount? How will I wire up the ECU?? Any help would be great.

 

you'll need to either convert the motor to OBD2 so that you can plug it into your car's plugs and then use an OBD2A - OBD1 jumper harness for your ECU, or use the entire OBD1 harness thing and put it into your car along with the motor. convert to obd2 is better.

 

how and what is all needed for me to convert the motor to OBDII?

 

distributor I know...not sure what else...

 

You need to use a 96-99 gsr ecu, distributer, and injecters. With that stuff everything thing should be plug and play. If you use the cx harness you need to add all the vtec wires and the Iab for the dual butterflies. The Iacv if it needs to modded the pinouts are 12, 13 is neg, 14 is power on connecter A. The Iab is 26 on A. The secondary o2 sensor is 5. Primary o2 is 6. Vtec solenid is 8. On connecter C pin 15 is vtec pressure switch (vtec oil psi). Connecter D pin 6 knock sensor. Looking at the wire side just look left to right and a count the wires 1-whatever and you should be go to go. Connecter A is the biggest, B Medium, C smallest. this link might help http://www.b20vtec.com/forums/...=3357

 

you will need to use your stock harness from 98 hatch or get a 96-98 vtec harness from civic ex.
Get dist, alternator to obd2. injectors you can use the obd1 if you rewire the injector plugs on your 98 civic harness.