I've allready used the search function, and I have either not found what I was looking for, or I want more current information. Thanks in advance guys.

I am putting a 97 jdm h22a obd2 + 5 spd trans. into a 97 usdm prelude. I am allready replacing the plugs, wires, clutch, flywheel, timing belt, water pump, auto to manual timing belt conversion. I have all the accessories/wiring from the h22a4 usdm motor previously in the prelude.

Should I use the JDM ECU I was sent with the motor from hmotors, or use my USDM ECU? Should I purchase a completely different ECU?

The wire harness to the jdm engine is located on the drivers side whereas the usdm wire harness is located on the passenger side of the vehicle. I have heard some guys say take the usdm harness off your old motor and use it with the jdm motor rather than extending the wires. However I think extending the wires will be easier. Are there any kits available online to do this?

I have read that I need to replace the distributor, cap, and rotor. Are these going to differ from usdm to jdm in any way?

I have read that you need to use the usdm oil pump because of a sensor or something, is this true?

Is there anything else that I should be doing/will have to do to make my swap run?

Also, I will not be running A/C. What should I do about the belt that will need to be shorter in length to accomidate for the missing A/C compressor pulley? Take a trip to my local pepboys or autozone with the correct measurements and get one or?

I would really appreciate any insight from anyone who has either done this swap or just has the knowledge. I couldnt find a write-up or anything does anyone know of any available? Thanks alot guys. - Mark

 

I wish I could answer all of your questions, but I did a swap with the 94 JDM motor.

I would use the ECU sent with the motor.

Use whichever harness is easier to you.

I had to get an older distributor with my swap because the old ones had the TDC and some other sensor in it. They should be the same for the 97s, though. I doubt you'd have to buy a new one....but I would check with someone more know-how.

The belt I have for the alternator without the a/c has part number 5060360. I think it's a belt for a hyundai elantra or something....I forget.

What are you planning on doing with your car? If you're going to track it, I recommend taking off the power steering, too. It really sucks when you're going less than 5 mph, but when you're on the track, you get a much better feel for the road and your car. If you don't mind having a little more vibration in your car, I would either get some motor mount inserts or fill in your motor mounts yourself. It cuts down on wheel hop and also keeps your motor from shifting as much during acceleration...you'll go faster, quicker. If you haven't already put in the motor, I would paint the whole inside of your engine bay. It seemed like such a nuisance to me when I did it, but I am SO glad that I did it now. I just bought some flat black spray paint and evened out all the paint in mine.

 

I'm planning to use my car as a daily drive with alot of spirited driving thrown in there. I also bought energy suspension motor mount inserts and the ingalls stiffy. I will also probably paint the inside of my engine bay as the new motor is not in the car as of yet. Thanks for your help 1gplussh.

 

this is what i did:

swapped the following parts from my USDM motor to the JDM motor
complete intake manifold with USDM wiring harness
exhaust manifold
distributor and coil
oil pump
oil pan and baffles
timing cover
intermediate shaft
ps pump and bracket
alt and bracket
ac compressor and bracket

I essentially made the external mechanics of the engine OBDII.

I am using a p28 ecu tuned with crome with a boomslang OBDIIA - OBDI conversion harness.
Tuning this motor brings it out of its shell that is locked with the p13 ecu so i would highly suggest doing so, but i am very bias to tuning motors that dont even have much done.

 

98vtec:

Is your motor originally a JDM h22a OBDI? Since mine is obdII, will what I have to do be drastically different than what you described in your post?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mlow634 &raquo;</TD></TR><TR><TD CLASS="quote">98vtec:

Is your motor originally a JDM h22a OBDI? Since mine is obdII, will what I have to do be drastically different than what you described in your post?</TD></TR></TABLE>

yes, it was originally the JDM OBDI H22. I have a 1998 prelude as well and in order for things to work correctly, you have to do what i did in order to not have things ghetto rigged.

On the JDM OBDI motor, the crank angle sensors are in the distrbutor. On the USDM OBDII motor, they are on the oil pump. Thus in order to PROPERLY do this setup by the book it would require swapping the OBDII oil pump and distributor onto the OBDI motor.

There are things that are just simply different from the JDM motor and the USDM motor that have to be swapped in order to work in an OBDII USDM prelude.

Do the things that i listed and you will ahve a JDM h22 in a OBDII prelude that drives like the original motor.

 

if you want to use the jdm dizzy its the same as a b16 dizzy cap you have to use the jdm ecu otherwise you have to switch the oil pump and the cdc from your usdm motor over to the jdm motor u can use the usdm harness the dizzy plugs just have to switched and you can convert the jdm dizzy to external coil if you want following the faq that is written up on it.

 

the shop that did my swap did some kind of voodoo with rewiring the JDM distributor to work with the USDM harness. From what I understand (and i'll find out more) is that they ran a wire from the crank sensor into the USDM harness, and they also used the stock coil as a "bridge" for some wiring. They used the stock coil for the triggering, i believe.

It got kind of complicated as he explained it. He ended up using some ODB1 harnesses to keep everything VERY clean. an average person wouldnt be able to see the re-wiring.

 

in other words it is ghetto rigged to work. future electrical issue from hell

 

98vtec:

Sorry if I was unclear, and maybe I have not been and you know full well what I'm talking about. If not, to clear things up, the motor I purchased is out of a 97 Jdm Prelude, so it is allready obdII. It sounds like by doing what your telling me, I would be running an obd1 ecu and be running obdI in my prelude. Maybe I am incorrect, but if not, I dont want to run my obdII engine as obdI for many reasons.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mlow634 &raquo;</TD></TR><TR><TD CLASS="quote">98vtec:

Sorry if I was unclear, and maybe I have not been and you know full well what I'm talking about. If not, to clear things up, the motor I purchased is out of a 97 Jdm Prelude, so it is allready obdII. It sounds like by doing what your telling me, I would be running an obd1 ecu and be running obdI in my prelude. Maybe I am incorrect, but if not, I dont want to run my obdII engine as obdI for many reasons.</TD></TR></TABLE>

oh, well then you shouldnt have any problems then. Did you state that it was a 97 JDM h22 in your original post or did you just edit it?

 

Well, I didnt edit my original post, but I'm not even sure if i did mention that information. If I did, I could see how it was easily looked over as that post was a very long winded one.

However, I am still unsure as to what ecu I should run. I am pretty sure the one that I recieved from hmotors with my engine has a speed limiter at 118. What can I do about that?