I'm planning to do a OBD0-OBD1 Conversion on my 91 Si with a B16A. I want to know what parts are required? Do I still need to use the fuel injector resistor box?

 

Conversion harness, 4 wire O2 sensor, OBD-1 ECU, and OBD-1 distributor. The legend has it that you can use your injectors and resistor box with your setup. If you choose to use the high impedance OBD-1 injectors you will need to remove your injector resistor box and hack off the green plug that went to it. There should be 5 wires that went to that plug and you will need to solder them all together. You will also need to replace your injector plugs with OBD-1 style ones.

 

OBD HARNESS FOR YOU

If you run the obd0 injectors, keep the resistor box. If you run the OBd1 injectors, solder the 5 wires together at the resistor box and remove the resistor box. My harnesses come with detailed instructions for an easy installation.

Jason

 

Does anyone know the best way to replace the injector plugs without destroying the crimps on the end of the wires. I have already taken off the injector plugs from what was left of an OBD1 harness, and want to just replace the ones on my stock harness without having to splice or solder connections. I "practiced" on the remnants of the OBD1 harness and ended up killing the tips of the wires, but the plugs are fine.


Oh and Jason, is there any way you could E-mail me your conversion instructions, I lost them when I moved out of my old shop. Thanks

 

Sorry if this has been covered time and time again however I did a search and this is one of the first threads that poped up on this. I have done obd 1 to obd 1 swaps before but to be honest the obd conversion thing has me a little worried. Any way my question.

In the previous swaps I have done I have always used the stock harness for the swap. However doing obd 0 to obd 1 (specificly a b18c into an 89 HF) I am thinking it would be easiest to use the b18c wiring harness would it not? Mainly due to the fact that it has all the plugs (4 wire 02, ITB's ect...) already there. Or would I need to move these over to the HF harness? Sorry if this question has been answered time and time again however I just want to be sure before I go and drop all of this cash on my rex.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KCHybrid &raquo;</TD></TR><TR><TD CLASS="quote">
In the previous swaps I have done I have always used the stock harness for the swap. However doing obd 0 to obd 1 (specificly a b18c into an 89 HF) I am thinking it would be easiest to use the b18c wiring harness would it not? Mainly due to the fact that it has all the plugs (4 wire 02, ITB's ect...) already there. Or would I need to move these over to the HF harness? Sorry if this question has been answered time and time again however I just want to be sure before I go and drop all of this cash on my rex. </TD></TR></TABLE>
Bump for info.
Jason are you out there?
I would like to know more about using the OBD1 engine harness as well.
Why hack it, If everything is already wired correctly?
I saw my swap running before they cut the car in 2. LOL

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KCHybrid &raquo;</TD></TR><TR><TD CLASS="quote">In the previous swaps I have done I have always used the stock harness for the swap. However doing obd 0 to obd 1 (specificly a b18c into an 89 HF) I am thinking it would be easiest to use the b18c wiring harness would it not? Mainly due to the fact that it has all the plugs (4 wire 02, ITB's ect...) already there. Or would I need to move these over to the HF harness? Sorry if this question has been answered time and time again however I just want to be sure before I go and drop all of this cash on my rex. </TD></TR></TABLE>

Use the stock HF harness. The B18c engine harness may plug up to all the sensors on the engine correctly, BUT the harness will not plug into your firewall connectors. Basically you will be left with an engine that is all wired up, but you can't plug it in.

I guess you could hack off your firewall connector, get the B18 plug from the donor car, and rewire it all up to fit. Screw that.... just add what you need to the HF harness.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4drEF &raquo;</TD></TR><TR><TD CLASS="quote">
I guess you could hack off your firewall connector, get the B18 plug from the donor car, and rewire it all up to fit. </TD></TR></TABLE>
This is what I'd like to try. LOL
Has anyone done this?
AND has it worked.
It seems SOOOO much eaiser than adding the extra dizzy, VTEC, and 4 wire 02 wires.

 

Jason has great customer service, he dealt with all of the situations as professional as you can be. Buy a harness from him!

 

One, why are you converting to Obd1? If its for C.A. smog then you will need to wire the car and make it look exactly like a '94 or '95 Del sol. Those are the only USDM cars that came with the b16 obd-1. Also you will need the ECU,P30, for the corresponding year. I done took my car to the ref. ,but my '90 JDM motor has some bad vavles, so my HC's are hella hi. Altough. I have a '95 b16 with low baby miles in good shape. I need to pop him in this weekend, and back to the sniffer!!! Holla at me for any info regrading this swap, for I done it ,and Ill try to help in any way. BEE16adokta@aol.com

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by azroth &raquo;</TD></TR><TR><TD CLASS="quote">
Oh and Jason, is there any way you could E-mail me your conversion instructions, I lost them when I moved out of my old shop. Thanks
</TD></TR></TABLE>

Yeah, I will get the instructions to you. The injector pins are a pain to me. I would just prefer to solder them on all day long.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">In the previous swaps I have done I have always used the stock harness for the swap. However doing obd 0 to obd 1 (specificly a b18c into an 89 HF) I am thinking it would be easiest to use the b18c wiring harness would it not? Mainly due to the fact that it has all the plugs (4 wire 02, ITB's ect...) already there. Or would I need to move these over to the HF harness? Sorry if this question has been answered time and time again however I just want to be sure before I go and drop all of this cash on my rex. </TD></TR></TABLE>

I personally would just solder in the extra wires. Look at it this way. If you do the OBD1 engine harness, you have over 20 wires of depinning and trying to figure out where everything goes. If you solder in the extra wires from my harness, you have 10 wires and you know where they go.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">This is what I'd like to try. LOL
Has anyone done this?
AND has it worked.
It seems SOOOO much eaiser than adding the extra dizzy, VTEC, and 4 wire 02 wires.</TD></TR></TABLE>

If you have the service manual for both cars, go for it. Trust me. It will be a pita, but can be done with the correct schematics. Get the OBd1 gsr harness and try and examine on how it would plug into the stock crx harness at the shock tower. You will see what I mean.

MY harnesses come with instructions so you dont have to guess what and where you are putting things.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Jason has great customer service, he dealt with all of the situations as professional as you can be. Buy a harness from him!</TD></TR></TABLE>

 

Yeah I am planing on the conversion harness either way just wasnt sure which would be the best way to do this. I am a neat freak so I supose I need to yank the harness well in advance of doing this to assist in this. Also is the hasport vtec conversion harness worth anything with this swap (and your conversion harness) since I am going to an obd 1 ecu?

As far as the person questioning why I am going to obd 1 (being that I live in the midwest smog? what smog? Inspections? nah) I just want it to run damn near stock (aka code free). I already have a p72 (obd 1) laying around, have my cable tranny now I just need the b18c and I am off to the races if you will. Well actually need more than the motor (mounts, wiring stuff ect...) but I am getting closer all the time. OBD 1 seems the best way to go with an obd 1 motor.

EDIT: Huge thanks for the help all

 

If you have the gsr harness, or a harness that you can get the vtec plugs from, then you do not need to get the hasport harness. if you are a neat freak, do it yourself with cutting the plugs from the gsr harness.

Jason

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CimorelliCRX &raquo;</TD></TR><TR><TD CLASS="quote">Jason has great customer service, he dealt with all of the situations as professional as you can be. Buy a harness from him! </TD></TR></TABLE>
I DID And the above is true. Thanks Jason, for all the help. B17 insertion moving slowly, but it is moving.
Jason, I'll PM or email, if I have more ???'s OK?

 

No problem man. I am here for your EF guys!

Jason

 

when you say conversion harness, is it the harnes for the engine? or the harnes to the ecu? the dizzy has different connectors from obd0-obd1 just wondering, i want to do obd-1 also, i have a greddy 18g kit but was not rigged for 2 o2 sensors

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spooned out &raquo;</TD></TR><TR><TD CLASS="quote">when you say conversion harness, is it the harnes for the engine? or the harnes to the ecu? the dizzy has different connectors from obd0-obd1 just wondering, i want to do obd-1 also, i have a greddy 18g kit but was not rigged for 2 o2 sensors</TD></TR></TABLE>
The harness' we are talking about here are used to patch in the OBDwhatever ECU to the OBDwhatever of the car you want to swap to. The dizzy wiring you got to do yourself(bad grammer )
HTH
PM or email Jason above (blown90hatch) He will answer all of your OBD* swap your ???s
The way my JK OBD0- OBD1 harness works is you unplug OBD0 ECU from car and the underdash harness. Plug one end of Jason's harness into underdash harness and the other end into OBD1 ECU. But, like Jason says,
there are 10 or so unconnected wires that YOU must connect or add to the engine harness in some way (4wire O2, VTEC wires,dizzywires) Molex connector, hard wire solder, butt connector?
That's up to you.


Modified by 4crx4me at 2:04 PM 9/6/2003

 

Hey Blown90hatch, I'll be ordering your OBD0-OBD1 harness soon, but money is kinda tight right now for me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMCivicEF9 &raquo;</TD></TR><TR><TD CLASS="quote">Hey Blown90hatch, I'll be ordering your OBD0-OBD1 harness soon, but money is kinda tight right now for me. </TD></TR></TABLE>
Wait for one of Jasons' "Sales" or "group buys".
He does them quite frequently in fact. That's what I should've done. I should've just waited,I'm not anywhere near done yet, AND I could've waited for a "Group Buy" and saved some money.

 

Yeah, if you guys have any more questions, let me know and I will try and answer them. I will be doing a GB prolly around Christmas time or so.

Jason