I have a 1988 Honda CRX Si with a 1st gen B16a swap. It's running a PR3 ECU via a conversion harness I bought off of Ebay which allows me to run the VTEC solonoid, oil pressure, dual O2 sensors and Knock Sensor.

I want to go ODB 1 so I can run a Hondata 4b. I've tried researching the internet on what's actually needed for this conversion but haven't found one good write up with everything included.

This is what I've come up with:

1) ODB1 ECU (P28 seems to be the most recommended)
2) ODB0 to ODB1 Conversion Harness
3) ODB1 Grey plug distributor
4) 4 wire O2 sensor
5) Something on injectors - wither ODB1 injectors or a wiring change
6) Engine Conversion harness which allows connecting ODB1 distributor, O2 sensor and injectors to ODB0 harness

There might be other items or points I'm missing...

Blurex contributed a good write up recently on the Hondata forum but pictures are desperately needed for clarification:

http://hondata.com/bb/viewtopic.php?t=177&highlight=

Come on guys...I know a bunch of you have gone through this. Help out a fellow user with no where to get an experienced person (I'm in Puerto Rico). I'm sure a lot of us will benefit. If I can't do this than I'll probably skip ODB 1 and get a ZDYNE Gold ECU.

Thanks!
Raul

 

One forum please.
https://honda-tech.com/zerothread?id=334477