Okay guys, I'm picking up a 1991 CRX HF and I'm wanting to ls swap it. Not ls vtec, just ls, eventually I'm going to build and turbo the ls.
Long story short, I need to know what ECU to run, and what exactly I'll need to do to make the car OBD1. I understand the car itself is OBD0, but I'm mostly only finding OBD1 LS motors. Any reply is helpful.
Thanks.
BD

 

you can buy the OBD0-OBD1 conversion harness for the ecu plugs and distributor plugs.
it's plug and play.

 

AHAH oh, well now I feel stupid. Thank you for that piece of information.

 

Get your conversion harness from Rywire.com. They are the best there is imo. Used many of their jumpers and never had one problem plus the give your great instructions with it. For an ecu get a pr4. Your crx is allready mpfi you wont need worry about doing the conversion. One thing you will need to do is get rid of the resistor box. When you get your motor is *should* come with a wiring harness(depending were you get your motor). Your dizzy plug will be on that harness. Just depin and repin into your harness.
OBD1 OBD0
orange - orange
white - white
orange/blue - orange/blue
white/blue - white/blue
blue/green - blue/green
blue/yellow - blue/yellow
yellow/green - large white
black/yellow - black/yellow
blue - blue
If your motor comes with the exhaust manifold you will probly allready have the 4 wire o2 sensor. The harness will have that plug as well and wiring instructions are provided with the jumper harness.