I got the motor and trany for 1k from a buddy. Its a 2000 motor with aprox 48k miles, LSD trany and all the needed bits and parts. I have the engine harness also. Im gonna swap it into a 91 CRX Si. I searched and I found out that its better to down grade the motor to OBD1 to make the swap much easier and to be able to use a Rywire jumper harness. Everything else is the same as any B-series swap. Since this motor is Obd2 I was wondering what I have to do to convert the motor to OBD1. If im not mistaking the injectors and fuel rail are involved.

Thank for the help


Modified by PuroMotor at 8:03 AM 4/8/2008

 

The injectors and fuel rail can stay. Just cut the injector resistor box plug off and connect all the wires together. After that you just need the said rywire ecu jumper harness and an obd1 ecu and distributor,and 4 wire o2 sensor. And you have to repin your dizzy plug using either the obd0 plugs or obd1 plugs. The wires match color for color except for one. Here's the diagram. (The thick white wire is by itself in the harness. The rest of the dizzy wires are inside the loom)

Obd0 to obd1 conversion at dizzy plug
Obd0------------obd1

Thickwhite--yellow/green
Thin white-- white
Orange------ orange
White/blu--- white/blu
Blu/yellow-- blu/yellow
Blu/green--- blu/green
Orange/blue-orange/blue

When you buy your rywire ecu jumper harness it will come with complete instructions anybody could use along with pictures to help you. Any more questions


Modified by thevtecnician at 2:03 PM 4/8/2008

 

no you can use the obd2 dizzy, jut get a obd0-obd2 dizzy jumper harness, all you do is plug and play

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PuroMotor &raquo;</TD></TR><TR><TD CLASS="quote">I got the motor and trany for 1k from a buddy. Its a 2000 motor with aprox 48k miles, LSD trany and all the needed bits and parts. I have the engine harness also. Im gonna swap it into a 91 CRX Si. I searched and I found out that its better to down grade the motor to OBD1 to make the swap much easier and to be able to use a Rywire jumper harness. Everything else is the same as any B-series swap. Since this motor is Obd2 I was wondering what I have to do to convert the motor to OBD1. If im not mistaking the injectors and fuel rail are involved.

Thank for the help


Modified by PuroMotor at 8:03 AM 4/8/2008</TD></TR></TABLE>

 

could you use a stock obd0 b16 distributor... or would he have to use a obd1 distributor with an obd0-1 conversion harness? ok just repin the plug and saves some money.

 

You can use a obd2 dizzy with a obd1 computer, thats why you would get the obd2 to obdo dizzy jumper harness why would you want him to buy a new dizzy when all he needs is a $20 jumper, also just use the stock obd0 injectors and the box can stay, they are all 240cc whether obd0,1 or 2, so if you have stock injectors use them or cut up your harness and solder just to use the obd2 injectrs which wont plug into your injector clips anyway so you need to attach obd2 injectors clips in your harness as well. I would just pop on all 4 obd0 injectors and be done with it

 

i agree with jimmy he's got it dead on. took me a second to get what you were saying.

oh and no one has addressed the tranny issue. you have a hydro tranny. your crx takes a cable.. definetly keep that ctr one and just convert to hydro. haspot sells the conversion piece.

 

I didn't know he could use any dizzy lol! learn somethin new everyday anyway, why buy a jumper? Here is the wiring for the obd0-0bd2 conversion at the dizzy. Just use the obd2 plugs.

Obd0-0bd2 conversion at dizzy

Obd0---------------obd2
Thick white-------yellow/green
Thin white--------thin white
Orange------------darkblue
White/blue--------red
Blue/yellow-------black
Blue/green---------yellow
Orange/blue-------green

 

to save even more money. do what i did, i just wired in the obd2 dist and injector plugs so i can just use my whole obd2 motor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .Grimace &raquo;</TD></TR><TR><TD CLASS="quote">i agree with jimmy he's got it dead on. took me a second to get what you were saying.

oh and no one has addressed the tranny issue. you have a hydro tranny. your crx takes a cable.. definetly keep that ctr one and just convert to hydro. haspot sells the conversion piece. </TD></TR></TABLE>

Yea Im gonna use the Hasport cable to hydro kit. So I guess everyone agrees that I can stay with my obd0 injectors and dizzy. Everything else is plug and play.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civickiller &raquo;</TD></TR><TR><TD CLASS="quote">to save even more money. do what i did, i just wired in the obd2 dist and injector plugs so i can just use my whole obd2 motor</TD></TR></TABLE>

The reason why I don't wanna run Obd2 is so that I don't go through the hassle of getting more conversion harnesses in case I wanna run Hondata since it only runs in obd1. But I do understand this would be the more simple and cheap way to go.

As for the obd-1 ecu...am I ok with a P28?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PuroMotor &raquo;</TD></TR><TR><TD CLASS="quote">Yea Im gonna use the Hasport cable to hydro kit. So I guess everyone agrees that I can stay with my obd0 injectors and dizzy. Everything else is plug and play.

The reason why I don't wanna run Obd2 is so that I don't go through the hassle of getting more conversion harnesses in case I wanna run Hondata since it only runs in obd1. But I do understand this would be the more simple and cheap way to go.

As for the obd-1 ecu...am I ok with a P28?</TD></TR></TABLE>

Yah you can definately stay with your obd0 dizzy and injectors. The p28 is a perfect candidate you can run the obd2 injectors and dizzy and still use an obd1 ecu for hondata. This is what civickiller meant

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thevtecnician &raquo;</TD></TR><TR><TD CLASS="quote">

The p28 is a perfect candidate you can run the obd2 injectors and dizzy and still use an obd1 ecu for hondata. This is what civickiller meant</TD></TR></TABLE>



although i run uberdata

 

Sounds good. Thanks for the info guys.

Also I took the crank to the machine shop and i found out its bad. Im gonna use a GSR crank and rods. Is there a difference in bearings from B16 to GSR?