My current motor setup is a 97 JDM ITR motor, completely stock internals, with jdm header, custom box/shortram intake, ctr b-pipe to spoon N1 axleback, carsound high flow cat, and stock JDM itr ecu.

Its in a 1996 civic hatch which is only relevent for my reasons of doing this ecu swap. Basicly, my car is obd2a and therefore must be emissions tested as an obd2a car and pass to... pass. Therefore I am adding all the things that will make a usdm itr ecu run on my car without throwing a cell.

If you care (I have added a second o2 sensor, switched to a pressure activated vtec sol., 1997 usdm itr ecu is on the way, and the crank sensor parts will be installed soon.)

So, to complete the conversion (for emissions purposes only) I will have to run a 1997 usdm itr ecu on my 97 jdm itr. I was told that it takes the ecu a full week almost to completely reset so my plan is to install the usdm itr ecu 1 week before I get it tested, run it as my daily driver as usual while it resets, then go to emissions and hopefully pass.

My question is, Is this ecu harmfull to my engine? I as because the jdm itr ecu has fuel curves for my engine which runs about about 11 compression which is higher than a stock usdm itr ecu which is about 10 something I believe. Does this mean that my engine (which is already probably a little lean do to only 93max octane being available in the us) will be running very lean as it will be run with 10 something compression fuel maps on an 11 compression engine?

I'm trying to do this and have almost finished putting all the parts on but wanted to make sure before I actually install the ecu.

I baby this engine and don't want to do something thats harmful to it, even for one week.

lazy readers: 97 usdm itr ecu bad on 97 jdm itr engine?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kay_animation &raquo;</TD></TR><TR><TD CLASS="quote">lazy readers: 97 usdm itr ecu bad on 97 jdm itr engine?</TD></TR></TABLE>

You don't need a week. One car I always had problems with CEL's and ****, it would run stoich after the first warmup after resetting the ECU. To be safe, let it have 3 warmups before heading over to emissions.

Lots of people have lots of mods with stock ECU's on USDM motors. I seriously doubt the differences between the JDM and USDM B18C/B18C5 will make any difference as far as safety. The stock ECU is dumping fuel at high RPM's anyway, and the stock ignition timing is pretty safe.

-Chris

 

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

You don't need a week. One car I always had problems with CEL's and ****, it would run stoich after the first warmup after resetting the ECU. To be safe, let it have 3 warmups before heading over to emissions.

Lots of people have lots of mods with stock ECU's on USDM motors. I seriously doubt the differences between the JDM and USDM B18C/B18C5 will make any difference as far as safety. The stock ECU is dumping fuel at high RPM's anyway, and the stock ignition timing is pretty safe.

-Chris
</TD></TR></TABLE>

Alright, thats what I wanted to know. So basicly, 3 warmups with I guess 20 mins of highway/city driving after each one should work?

Thanks a lot btw.

 

I am pretty sure this is the difference...(stock that is)

USDM ITR - 10.6:1

JDM ITR - 10.8:1

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmitr &raquo;</TD></TR><TR><TD CLASS="quote">I am pretty sure this is the difference...(stock that is)

USDM ITR - 10.6:1

JDM ITR - 10.8:1

</TD></TR></TABLE>

If thats true, its not that bad I guess. Thanks for the numbers.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmitr &raquo;</TD></TR><TR><TD CLASS="quote">I am pretty sure this is the difference...(stock that is)

USDM ITR - 10.6:1

JDM ITR - 10.8:1

</TD></TR></TABLE>

JDM ITR has 11:1 compression ratio

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slammed_93_hatch &raquo;</TD></TR><TR><TD CLASS="quote">

JDM ITR has 11:1 compression ratio</TD></TR></TABLE>

Yea, thats what I have read everywhere else. Thats why I was concerned about the ecu's compatibility.

 

i have a OBDIIA ITR ECU for sale if you want one

 

I ran a '98 USDM ITR ecu on my JDM ITR engine with no problems whatsoever. I also dyno'd the two back to back and there was a slight power gain with the JDM R ecu with only a 2whp peak difference above the US ecu. I was not running lean or anything like that either with the US ecu.

You should be fine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Gee3 &raquo;</TD></TR><TR><TD CLASS="quote">I ran a '98 USDM ITR ecu on my JDM ITR engine with no problems whatsoever. I also dyno'd the two back to back and there was a slight power gain with the JDM R ecu with only a 2whp peak difference above the US ecu. I was not running lean or anything like that either with the US ecu.

You should be fine.</TD></TR></TABLE>

Yay, thanks, thats what I wanted to hear

 

Hello this has to deal with the above mentioned statements. I recently purchased a 2000 civic HX with a 98 spec Jdm itr. I went to get it emissioned at the local firestone, they informed me that the car failed emissions due to their computer not being able to read my rpms. I am definitely new to the Jdm itr so I just trying to figure out if there is anything inexpensive I can do to fix the problem. Like just taking to another place like the honda dealership or something. Any info would be great. thanx.

 

Just some advice from experience here...

Sounds like you know exactly what you need to do, with one exception.

Buy a cheap OBD scan tool that can check sensor "readiness", just install the usdm ecu and drive the car for like 15 minutes and check to see if any of the readiness monitors are not yet "ok"... then just keep reapeating the process until they are all "ok".. then head directly over to emisions and collect your reward lol.

You car should also run just fine on that usdm ecu... and when you are trying to get the monitors to set, take the car on the hwy and some in city stop and go driving, plus turn the car on and off a few times.

jason

 

the scan tool will do more than a ready check. the LT and ST fuel trims are what take time to set. generally driving a tank of gas in mixed city / highway will have the ecu pretty dialed. all stock itr ecus are a tad rich and you will have no problem with the usdm ecu on a jdm itr engine. they are identical motors other than the pistons which are what change the compression. the jdm ecus have a tad more timing in them from what i;ve heard which is why they commonly make 1-3hp over the usdm model.

 

so does anyone have a usdm itr ecu i can buy.

 

they come up on ebay from time to time. a02 is the 97, a03 98 and a04 has the immobilizer and is obd2b

 

So the a04 is the one I want to get to have the car pass emissions in Missouri? I looked the ECU's up on ebay already and would this work?

http://cgi.ebay.com/ebaymotors/HONDA...item2c52249830




OR would it give me more problems?

 

a 96 civic with a 97 jdm itr engine needs the ultra rare a02 ecu. even a03 will work but it has the gas tank sensor. a04 is obd2b, did i miss something in your first post?

what you listed is an obd1 ecu with some type of type r map. the redline is also too high for a stock R, if you take one to 9200 it's not going to live as long as it should and the car isn't even going to be faster. a stock R peaks around 8000 +10% is 8800 which is as high as you want to take one.

if you go obd1 get your own ecu and a hondata s100, then have a real shop tune it to your specific car.

pherable.net will sell you the same thing you have posted for 175 btw