I have a '99 Civic Ex 5-Speed with an OBD2 ECU and I am looking for an OBD1 ECU, I have found a couple of P28 ECU's on Ebay that came straight from 5-Speed 92-95 Civic Ex's. I was wondering if that is all I need except for the OBD2 to OBD1 harness? I am also planning on getting a Turbo for my car and I was wondering if that is the right ECU? The reason I am asking is that I have seen OBD1 ECU's that come with different chips to change the Vtec point and the Rev Limiter.

 

i think all you need is the conversion harness but i think the fuel curve is different, so no point in changing the vtec crossover without changing fuel, unless the chip does that too

 

What do you mean the Fuel curve is different? Are you talking about there is a difference between a 92-95 and a 99?

 

Well an auto ecu does you no good, cause it'll throw a CEL for missing auto transmission lockup solenoid, and refuse to run, I believe.

Fuel curve probably is different, but better.

99 civic is an OBD2B harness, very important.

No honda ecu will run boost by itself (well, short answer, heeheh) but the P28 OBD1 is a great platform to start from, and then have a fuel managment system.

-PHiZ