I did a search and came up with a ton of useful info... I do have a few questions left though. I am installing a obd1 jdm b16a motor in a 90 dx obd0 hatch, so the obd0 to obd1 wiring conversion comes up... I have the wire harness for the obd1 motor already and i was wondering if i should buy the obd0 to obd1 conversion harness or can i save some money and just solder on extension lines for a few of the wires and make it work with the harness i already have?
A really good link is...
http://www.geocities.com/kurtsi_on/page8.html
If i do get the conversion harness, does it just simply plug up and everything is ready to run? I saw this one guy took 15 hrs to wire everything up, but like i said i have the obd1 harness and just 7 wires that need to be ran somewhere, anyways im gonna look at his car tomorrow so any info is very helpful.

 

get a hold of me bud. i ll help ya out

 

Use that website you have to build your own harness....it is so much easier and cost effective.....

The time involved to rewire everything is pretty bad if you cut your ECU plugs and resolder everything right there, however, if you build a conversion harness it is a simple plug and play. Yes, you'll need to run 7 wires to your engine compartment (VTEC solenoid, VTEC oil pressure, o2 heater wire, injector #2, injector #4, and two sensors for the distributor) AS WELL AS making the necessary changes to your existing engine harness such as repining the distributor plug using the obd1 plug, using the obd1 injector plugs, and some sensor relocations.......but other than that it is easy. I strongly encourage you to try it, if you have any questions just let me know.

Lester

 

The conversion is really not as hard as everyone says. As for making an adaptor vs changing the plugs, each has its advantages and disadvantages. The main advantages of making an adaptor are (1) simplicity of changing back to the original ECU, and (2) not having to solder in cramped quarters. But changing the plugs gives you a more secure and cleaner setup.

 

going from Si to obd1 is somewhat easier.. I went from obd0 to Si, then converter to obd1. Needless to say its a web in there. Before my next swap, Im gonna tear the harness out, and just do it all over to make sure its all in one piece. The adapter harness was a bitch, but it might have just been my working conditions.