I have recently gotten ahold of a complete B18C1 and wanna know the best way to install it into my rex. Before I got the GSR engine (at a sweet price), I was planning on installing a B16a1 into my car. Now, I have to re-think everything. I am not sure whether to stay non-obd or go obd-1. I have a 91 CRX DX. But, I also have the complete wiring harness from the engine bay of my 88 CRX SI parts car. I was planning on using the SI harness on my the B16a1 when I got it. Here are my options now.

I could stay OBD-0, and get a chipped ecu from Zdyne. Supposedly, I only have to add 2 wires (for Vtec and Air Intake Bypass). I know that I have to use the stock injectors (also from the SI parts car), and the injector resistor box. I have also heard that the only other distributor I can use is from a B16a1. I would rather not do this due to the lack of any U.S. substitute (except for that crappy hack-job LS distributor modification).

My other option is to try to find a complete OBD1 wiring harness and use it on my car. What I want to know is how hard is it to substitute this? What about my speedo and tach (cable vs. VSS)? The good thing is that I won't have to use a different distributor or fuel injectors. I also won't have to worry about the injector resistor. I also can use the stock ecu for the car, which usually makes the engine run best.

Now, the reason why I don't go OBD1 without asking is b/c of my future plans. I do want to turbo the motor, and with such a mod I was planning on getting a Zdyne Gold ECU. The only cores they use are from nonOBD cars. So, what would be the point of converting to OBD1, only to have to convert back again in the future? It would just be a wiring mess.

Does anyone else have a GSR in their rex? How did it run? What did you do (wiring)? Thanks for your help.