JDM CRX

i may just be overthinking this subject way too much, but anyhow.
im getting an ITR enigne for my 99 EK, ill get the 99-00Si wiring harness like everyone says to get. some people say to get a chipped p28(ITR computer) and run the skunk2 converter harness. WTF if the engine is meant for OBDII how can you use a OBDII ECU and yet convert it to OBDI when thats not what the engine is??????? are some plugs just not used after its converted? im sure the 99-00 si harness has two plugs for two O2 sensors as well as some other plugs for OBDII.(which should all plug up to the ITR engine)
hopefully this is making sense to someone, cuz im just not getting the picture here, but if anyone can settle this once and for all, ill be a happy camper
---also instead of any chipped ECU, if i ran MSD SCI ignition,,at which you can set your rev-limit on that and if i got a V-AFC which controls everything,, that would eliminate the use of getting a chipped ECU. Correct?
thanks


[Modified by JDM CRX, 5:59 PM 3/21/2002]

GokuSSJ4

j-spec R engines ,
just use your harness and run a jumper from skunk2 to convert to obd1 and run a chip p28 and your set . besides you are able to tuned the engine a lot better.

Apex i ITR

A P28 is a civic SI (92-95) computer. You'll need a jumper harness that will convert your OBD2 car to OBD1

fowler!

Don't even worry about it. The harness takes care of everything. The signals that the ECU send to the motor are just re-routed. Works fine and all..

I guess the only thing that you might have to worry abou is the vtec pressure sensor (I think that's the one...it has something to do with vtec). JDM ITR motors don't come equipped with this sensor, and when the USDM ecu that you have looks for it, it'll throw a code because it can't locate the actual sensor. Best bet would be to run the 00 JDM ITR ecu. Might be a little hard to find, but would be well worth it.

Get that tuned with a VAFC and you'd be good to go.

kenji

I can make you a OBD2 to OBD1 ECU conversion harness.

If you need any references just ask around on these boards.

Email me if you are interested.

-kenji

B18C5-EH2

kenji kicks ***! I ran his jumper harness at first with a JDM-spec ITR P73 ECU, then I ditched that ECU in favor of a kenji-spec P28 ECU...

His ECU is the bomb.

TodaSi

Kenji is the man. I'm running his harness. Great work!

Halo

Kenji is awesome

Bleed Black

Kenji

B18C5-EH2

EDIT!!! The following only applies for 1992-1995 Civics - I just noticed that this guy has a 1999 Civic, so please disregard this post unless you have a 1992-1995 Civic - only then should you take the following advise!!!

Okay, let me spell out how to convert it, okay?

First of all, KEEP the Type R engine harness on the car. It will PLUG right into the underhood harness on your Civic (1992-1995). The place where it plugs in will be on the passenger side strut tower area. Even though the motor is "OBDII" the engine harness still plugs right in. This allows you to keep the Type R injectors and distributor without rewiring any of that ****.

How would I know this?

Bevcause I've done 2 of these Type R into 1992 hatch swaps, and I own one too. It will work the same for any 1992-1995 Civic.

After you plug in the harness, you will need to decide on 2 different options:

1. Run the P73 ECU and a jumper harness from kenji. This will require the wiring of extra OBDII sensors though, so you WILL be OBDII then.

2. Run a re-chipped P28 and no jumper harness. Get the P28 done from kenji and make more power then the P73 ECU, but more importantly you will be OBDI and will have NO additional OBDII wiring **** like extra 02 sensor, or crank fluctuation sensor, etc.

I tried #1, but #2 made more power and simplified things.

Good luck, and depending on what year your car is, you may have to wire up VTEC, but no knock sensor if you run the P28 ECU - it doesn't read for one



[Modified by B18C5-EH2, 2:43 PM 3/23/2002]

W.O.T.

b18c5-EH2,

How much more power does a re-chipped P28 make compared to a P73?

I'm in the process of swapping the complete OBDII harness from a ITR to an 92-95 civic (Have a wrecked ITR, currently looking for a good Civic). I am planning on swapping the complete harness because (1) I have the harness (2) I'd prefer to not spend money on a harness adaptor and a re-chipped P28 (3) I'm a glutton for punishment

The OBDII harness also will allow me to swap over the ABS system (I know, more work) as well as the guage cluster and fuel pump without re-wiring.

If the P28 makes substantially more power then I may reconsider. Once I'm OBDII, I'm stuck with the P73.

Opinions / comments?

Aaron.

B18C5-EH2

If you run the P28, then there is NO need for a jumper harness. You can have a P28 re-chiped for $150.00 from kenji here on H-T.

I put down 175whp with only kenji's P28 ECU anf an intake and exhaust. Stock ITR exhaust manifold and all.

Why go through all that OBDII wiring and bullshit? Like i stated above, the ITR engine harness still plugs right into the Civic harness, and then the P28 plugs right into the Civic harness because it came in the 1992-1995 Civic Si/EX and Del Sol Si.

You can find a P28 for like $75.00 if you look hard enough, and then you can sell that P73 ECU for whatever you want for it - $200-$400 is what i've seen them sell for.

OBDII is not worth the trouble - it has an extra 02 sensor, crank fluctuation sensor, gas cap CEL bullshit, etc. and those are all things that could end up costing more monet later on.

One 02 sensor going bad is bad enough, but try replacing 2 when they both go bad.

Good luck man.

W.O.T.

Thanks for you reply.

Oops, my mistake, of course the P28 plugs right in - Duh! Both are OBDI.

So with a re-chipped P28 you put down 175whp, compared to about 167whp with a P73?

What about the guage cluster and fuel pump? I'd have to re-wire the harness to use them...

And the ABS system, it functions on it's own computer box that was mounted beside the right B-pillar in the ITR. It is independent from the ECU correct? If I still wanted to use the ABS system, I'd have to make my own ABS harness then...

Hmm...

Aaron.

B18C5-EH2

Guage cluster?

Are you running the Integra dash too? The TEg cluster won't go right into the Civic dash. You could always just get a 1992-1995 Si/EX cluster - tach goes to 9000rpms

Fuel pump? Type R and GS-R share the same fuel pump - I called Acura myself to confirm this. The 1994-1995 GS-R fuel pump plugs right up in the 1992-1995 Civic, so unless the OBDII cars changed their fuel pump plugs then you should be able to just drop that in too - no rewiring.

ABS? Why? Just curious. I'll do almost anything to REMOVE weight from my 1992 Civic


[Modified by B18C5-EH2, 2:46 PM 3/26/2002]

W.O.T.

No, at this point I'm thinking of NOT using the ITR dash as it won't fit right with the door skins - Plus it weighs a ton! I've seen a pic of an ITR cluster in an EG and it doesn't look that bad, but yes, the fuel and temp are cut off a bit from view. I'll have to modify the housing a bit and make brakets to get it to sit right.

The 94-95 GSR pump bolts in cause it's OBDI. The OBDII pumps are different I'm told. I'll know for sure when I get my civic. Or I could send you a pic and you could see.

And as for ABS, well it weighs about 10-12 lbs I figure for the pump, computer, fuse box and wiring. I live in Vancouver BC Canada and we get LOTS of rain. Just like in Texas I'm sure AC is worth it's weight in gold. So I'm planning on NO AC, but Yes on ABS. On a high powered, lighweight car it's pretty important - I'm sure you know that ABS is always gonna stop shorter that a professional race driver thresh hold braking. And anyone saying otherwise is wrong.

I agree 100% with weight reduction. In fact my friends make fun of me and make jokes like "You better go pee before you leave so you'll be 3 lbs lighter!" As I am/was planning on replacing the entire wiring harness, I am going to have a good opportunity to find parts I don't need as much as Honda engineers thought

Any more thoughts about which harness / ECU to use? You've got me questioning my options...

Aaron.

B18C5-EH2

So which harness are you debating?

Engine or body?

W.O.T.

I'm debating if I should convert the car totally to OBDII (replace body wiring) because of the points listed above, or to get a chipped P28 and hack the ABS wiring and cluster wiring...

tc

Would any of this apply to a 96 civic cx? I've got the swap in and running, using a p73 chip. I'm running with a check engine light. The person that helped me install told me it's on because of some sensor in the gas tank from OBDII. If I used a chipped p28 ecu would that get rid of the problem?