OBD2 to OBD1 conversion

2kCivic_GSR · 05-14-2005, 08:09 PM

I was wondering what would be needed to convert a 99 GSR OBD2 to an OBD1? Thanks. Late.

Greenblurr93 · 05-14-2005, 08:48 PM

an ODBI ECU, and thats it (if the motor is going into a 92-95 civic) and youll need the upper drivers side motor mount from the Teg, and u may need to add a couple of wires to the civics sub harness depending on the trim you have

CivicSpoon · 05-14-2005, 09:23 PM

Depends on what car it's going in to (you're talking about a '99 GS-R engine, not a '99 Integra car right?). If you're talking about an OBD1 car (ie Civic or Integra), then check out this link [6th post down]: http://www.honda-tech.com/zerothread?id=550976

2kCivic_GSR · 05-14-2005, 10:01 PM

Sorry I guess I wasnt giving out enough information. But I already swapped a 99 Gsr motor into a 2000 Civic Ex. Everything works fine its just I just got some DC 4-2-1 headers but its an OBD1. I heard that you could convert to an OBD1 somehow so thats why I was wondering how to do it. Also I heard that ODB1 engines were better than OBD2 is that true? Thanks for the replies. Late.

CivicSpoon · 05-14-2005, 10:21 PM

Wait, you're header is for an OBD1? Do you mean it only has 1 O2 sensor bung or something? You're engine is OBD2 and your car is OBD2, so... I have no clue what you're trying to say, please explain more.

But I've also heard that OBD1 responds better to modifications. Whether that's true or not, I don't know, maybe someone else has some insite on that. The easiest way for going about that is buying an OBD2b to OBD1 conversion harness and buying an OBD1 GS-R (or chipped OBD1) ECU.

2kCivic_GSR · 05-15-2005, 10:31 AM

Yes, the headers are meant for an OBD1...My GSR motor is an OBD2...on my stock headers theres an 02 sensor at the end of the header kind of like the second picture I have below. The first picture is the headers I have now. I was hoping to possibly just make my own hole so I could place the sensor in it..but i didnt want to take the risk and ruin the headers. Also I was thinking about just putting the headers on and using it without the 02 sensor in it. But I heard that without that 02 sensor in the headers itll run rough is that true? Sorry if this is all confusing hopefully this is much better. Thanks for your help. Late.

Greenblurr93 · 05-15-2005, 11:28 AM

It will run like rectum without an O2 sensor, just buy an O2 sensor bung and weld it on and then convert to ODBI. or keep it ODBII

2kCivic_GSR · 05-15-2005, 11:08 PM

Where could I find an O2 sensor bung that I could weld to the headers I have now? Home Depot? AutoZone?

Greenblurr93 · 05-16-2005, 07:30 AM

that im not sure about, just call around and ask

Gohan Ryu · 05-18-2005, 02:44 PM

I didn't check to see if they have the exact harness you need, but try this link...

http://www.boomslang.us/obd2to1.htm

You're still going to have to deal with the O2 sensor, so this probably won't help you.

2kCivic_GSR · 05-18-2005, 06:38 PM

Thats a very cool link..I've never seen a setup like that. I'll be sure to look into it alot more. Thanks for the link. Late.

bill-the-ba$tard · 05-23-2005, 03:40 AM

obd1 and obd0 are better than obd2 because you can chip them, and if you have the right software and knowhow, you can write your one fuel maps and burn them on a chip. obd2 is designed to be more emissions friendly... it requires two o2 sensors -- one before the cat, and one after, just to compare the results and make sure that the cat is doing its job. I think one o2 sensor is plenty, and who cares about the cat?

-John

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