p28 help??? - Honda Prelude Forum

blkludeH22 · 05-07-2008, 10:28 AM

im going to be putting a p28 ecu in my 2000 lude. i ve read a bunch of **** about chipping it and other stuff to control the iab valves but nothing has givin me a good direction on how to do it. the chipping is no problem. can somebody give me a write up on how to manipulate the ecu for the iab valves cause every link i have clicked on for it does not come up for some reason. is there anything else im gonna need to do besides this for it to run in my car? i have the harness and a tune will be done as well...thanx

Artifex · 05-07-2008, 02:30 PM

I am moving this to the N/A forum.

A p28 cannot natively drive the IAB wire. p28s were originally designed for b16 engines, which have a single stage runner IM with no IAB mechanism. I believe there is space on the PCB to solder in the transistors to drive this signal. I believe the pin on the connector is unused by default, which means you can connect it to the IAB transistors if you add them yourself.

All the information to do all this used to be on PGMFI.org. I have learned that PGMFI is now down, and I have no idea if/when it is ever coming back. I would suggest you try doing a Google search and a Honda-Tech search for the terms p28 and IAB and you might find the directions to do this.

Good luck.