RuffRhyno

I have searched this site and found several suggestions for this setup, I just want to clarify the best route. This is regarding a B18C5 into a 93 CX. What would be the best harness to use, a OBD1 EX/SI harness, or an OBD2/2.5 Type R harness? I will be running a chipped P28 ecu and OBD1 distributor on this setup.

Someone told me that I can actually use the OBD2 Type R engine bay harness on my car, it basically plugs right up to every sensor on the B18C5 (USDM) and the harness on the strut tower. If I stay OBD1 with the motor, I know I can change out the distributor plug from the OBD2 distributor for my OBD1 distributor plug.

Anybody have the CORRECT answer?

B18C5-EH2

From personal experience, and this is gosphel:

B18C5 engine wiring into a 1992-1995 Civic:

IMO the USDM ITR swap is easier to swap in. I've done this swap 3 times already and it is 100% easy especially if you run a re-chipped P28 and even more so if you have a 1992 Civic or any 1992-1995 Si, VX, or EX with VTEC wires.

Here's what you'd need too do if you have a USDM ITR swap:

KEEP the ITR engine harness. Regardless of what others say the plugs all plug right in. This way you get to keep the newer ITR distributor and injectors, and there is no need to rewire anything. Again this is from experience, not hearsay.

You'll have a few extra plugs left over on the ITR harness because the ITR has a few extras that our Civics don't have, like ABS, etc. You vcan just hide the extra plugs.

Now there's a few different ways to get an ECU to work, and I'll list them from easiest to hardest:

1. Re-chipped P28. This will simply plug in. No need to wire up for a knock sensor because the P28 doesn't read for one. Better fuel, timing, VTEC x-over, and rev limiter = more power. OBD1 so no need at all to run any sort of extra sensors.

2. Kenji OBD2 jumper harness and JDM P73 ECU. I ran this on my motor for a while before the kenji ECU. You'll have to wire up a knock sensor wire and that's about it. Drawbacks are that this ECU has a 113-115 speed limiter and it doesn't make the power that the kenji-spec P28 does. ThisECU has OBD2 type plugs but IT RUNS AN OBD1 PROGRAM AND IT IS ONLY OBD2 IN PLUGS!!! I ran this ECU with no extra o2 sensor, no crank fluctuation bullshit, etc.

3. Jumper harness with USDM P73 ECU. Why? I wouldn't do this unless I was in Cali and it was necessary for smog bullshit. You'd have to wire up all the extra OBD2 bullshit and the ECU sucks compared to a re-chipped P28.

Pics coming...

B18C5-EH2

Pics.

1998 B18C5 into 1992 CX Civic - stock B18C5 "OBD2" engine harness.

jumpmann23

is it the same with the obd2b integra harnesses?

B18C5-EH2

Bump. Just got two IMs about this same subject.

B18C5-EH2

Refer to this here:

https://honda-tech.com/zerothread?id=595648

B18C5-EH2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ruthlessbucket &raquo;</TD></TR><TR><TD CLASS="quote">is it the same with the obd2b integra harnesses?</TD></TR></TABLE>

Yes.

00-01 ITR swaps can keep the ITR engine harness and remain plug-in in terms of the 1992-1995 Civic chassis harness.

Ausmith

Everything mentioned here is true. I'll be doing a 98 USDM ITR into a 95 CX. If anyone needs specific pictures or how-to's please let me know and I'll be glad to document. I'll be doing the swap in the next 3 weeks.

markaria

very true... I use the b18c5 harness/93 civic si/ chipped p28 - plugs right in

hybridhatch18

how about if it was a jdm type R into a 94 civic cx? would i have to use a usdm engine harness and is it ok to use an obd 1 p72 ecu instead of a p-28?

hybridhatch18

anybody know?

hybridhatch18

anybody?

Nerv2g

The reason people suggest you to use the p28 ecu insted of the P72 because it is 100% plug and play. You can use the JDM one. If you are using the JDM motor it is best to use the JDM ecu.
Why?
Well on the JDM motors (96 and up) the vtec pressure is controlled by the ECU. I had the same issue I was using a p28 ecu with my swap and had to buy the USDM vtec pressure assembly ($260). So if you can try to use the JDM ecu. Hope that helps.

hybridhatch18

would there be anything wrong with using the p72 though? like will it run like ****? or do i have to buy a conversion harness to use the jdm p73?

B18C5-EH2

P72 will run a B18C5 like ****.

The VTEC X-over on the P72 is way too low at 4500, whereas the ITR likes a nice 5200rpm X-over.

Lower rev limiter, timing and fuel curves aren't optimal, etc.

TedR719

I'm interested in swapping in a JDM ITR motor in a 92-95 hatch, will the harness work the same way? Cause all this is from a USDM spec motor and harness, any major difference if you swap a JDM ITR motor?

Ausmith

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by futuresi &raquo;</TD></TR><TR><TD CLASS="quote">I'm interested in swapping in a JDM ITR motor in a 92-95 hatch, will the harness work the same way? Cause all this is from a USDM spec motor and harness, any major difference if you swap a JDM ITR motor?</TD></TR></TABLE>

Few things on the JDM Swap:
1)Depending on ECU (JDM or USDM) you may need to switch VTEC solenoids. The JDM ECU will work with either a JDM solenoid or a USDM. The US ECU will only work with US ECU.
2)The wire harness is a bit different due to right hand drive. You will need a compatible USDM engine harness. I suggest the 98 USDM ITR engine harness.

d15Beta

ey tom, i gots a question, im too planning a swap for my 94 Eg hatch, but il be dropping in a b16 only,

my main question is that down here in south east asia, the production of the hatch back EG doesnt have or show if its a vx or so..

we all got the same eg hatch here, and the other thin is that, we have a 1200cc carbed engine, which i think was derived from the d series engines, how will i go about the wiring to this? since its a carbed engine, and the b16a is efi, i know id have to change fuel tanks and all that, but my main thing is the wiring,

the b16 im planning on getting comes with axles ecu and harness,

im still gatherin info for he swap,

and ur posts have bin helpful tnx B18c5-eh2

1.8t

I noticed that for the Si, EX, and VX this swap is said to be easier. Is it because they have vtec already pre-wired? I plan on doing a swap into my 94dx, would I just have to wire for vtec or are there more things involved?

Ausmith

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1.8t &raquo;</TD></TR><TR><TD CLASS="quote">I noticed that for the Si, EX, and VX this swap is said to be easier. Is it because they have vtec already pre-wired? I plan on doing a swap into my 94dx, would I just have to wire for vtec or are there more things involved?</TD></TR></TABLE>

That is true. On a CX/DX you will need to add the appropriate wiring to the cabin/engine bay harness.

1.8t

I did a search, but couldn't find anything. Maybe I am searching under the wrong terms. But, what wires would need to be run to make a Type R swap work in a 94DX hatch? Just a vtec wire or what? Sorry about all the newb questions.


Modified by 1.8t at 6:59 PM 8/21/2003

TedR719

Well I plan on buying the swap from Steve @ HMO since thats where I got my b16 from http://www.hmotorsonline.com/s...30010

So if I'm not mistaken the ecu is obd2 P73, but I wanna keep the car obd1. I plan on running a Hondata when I get the swap. So as far as the alternator and vtec soleniod what would I need to do?

I think the waring harness he gives you is the jdm one, so I would need to buy a 98 USDM harness from what I understand now.

PHiZ

This is a nice time to remind everyone that all of the 1992 civics came pre-wired for vtec regardless of trim level.

92 was the first year of OBD1, and for some reason, all the trims are wired the same.

-PHiZ

hybridhatch18

bump for how 2 do a 96 jdm itr swap in a 94 cx

Ausmith

You got IM....

We did one this past winter.