i was woundering if i had to convert the obd1 harness to obd2 and if i did where could i find the information on doing so. i was also woundering what i would need to get the vtec working? i searched but couldnt really find anything...

 

it depends on u whether u want to stay obd1 or obd2...most ppl go obd1 bcuzz they can play around with the tuning..with obd2 u cant do that...i suppose u would want the vtec to work otherwise u wouldnt be doing a swap...use ur stock d series harness

 

wouldnt i need to convert to obd2 tho since the b18c5 is obd2?and u have any links that would be helpful to me?

 

bumb

 

please do a search, this exact swap has been convered in detail a few times. How to on wiring and mechanically.

if you remain OBD1 (which you should unless your in cali) simply plug in the teg harness into the shock towers and you will be close. Again the walk throughs on here detail what you need to do.

 

You can use your wiring harness you'll just have to swap a few things over and add a couple of wires.

-swap the distributor plugs over from your DX to the GSR's or use an OBD1-2 distributor adaptor

-use the DX injectors

-add VTEC solenoid, VTEC pressure switch, Knock sensor, and IAB wiring

-use an OBD1 GSR ECU

-swap the plug housing off your DX's alternator onto the GSR's alternator

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaPartsHero &raquo;</TD></TR><TR><TD CLASS="quote">You can use your wiring harness you'll just have to swap a few things over and add a couple of wires.

-swap the distributor plugs over from your DX to the GSR's or use an OBD1-2 distributor adaptor

-use the DX injectors

-add VTEC solenoid, VTEC pressure switch, Knock sensor, and IAB wiring

-use an OBD1 GSR ECU

-swap the plug housing off your DX's alternator onto the GSR's alternator</TD></TR></TABLE>
first off he said it's a B18C5 not a B18C1.
second the OBD2 injectors, alternator and distributor plugs will work fine. As long as you use the OBD2 engine harness to the shock towers.

JDM B18C5 does not exist though... B18C5 is USDM.

OP do you mean B18C from an ITR or a GSR? Or USDM B18C5?

 

i mean the b18c. so i should just use the obd2 engine harness that comes wit hthe motor instead of my dx harness?

 

Oops sorry missed the 5 part. If the motor is the USDM one you can use the engine harness and plug it right in, if its the JDM harness it won't plug in without extending the wires as its for RHD. You will still have to either run the knock sensor wiring from the knock sensor to the ECU or run it from the shock tower plug to the ECU. You will still need to decide which ECU to run, I think most people use a chipped P28 and in that case you won't have to run the knock sensor as the P28 won't look for it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">
first off he said it's a B18C5 not a B18C1.
second the OBD2 injectors, alternator and distributor plugs will work fine. As long as you use the OBD2 engine harness to the shock towers.

JDM B18C5 does not exist though... B18C5 is USDM.

OP do you mean B18C from an ITR or a GSR? Or USDM B18C5?</TD></TR></TABLE>

Don't mean to steal your thread but if I stick with the OBD2 engine harness with my GSR engine will I have to use the OBD2 ecu or is the P72 usable or is the chipped P28 the only way to go?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaPartsHero &raquo;</TD></TR><TR><TD CLASS="quote">Oops sorry missed the 5 part. If the motor is the USDM one you can use the engine harness and plug it right in, if its the JDM harness it won't plug in without extending the wires as its for RHD. You will still have to either run the knock sensor wiring from the knock sensor to the ECU or run it from the shock tower plug to the ECU. You will still need to decide which ECU to run, I think most people use a chipped P28 and in that case you won't have to run the knock sensor as the P28 won't look for it.</TD></TR></TABLE>

Like HondaPartsHero said the JDM harness isn't going to run to the correct side of the car. So either pick up a USDM harness and simply plug it in or pull apart your existing harness and run the wires to the right place.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Slow93egg &raquo;</TD></TR><TR><TD CLASS="quote">Don't mean to steal your thread but if I stick with the OBD2 engine harness with my GSR engine will I have to use the OBD2 ecu or is the P72 usable or is the chipped P28 the only way to go?</TD></TR></TABLE>
with an OBD1 chassis and OBD2 engine harness the ECU will plug into the OBD1 side of the harness and will run everything fine. Just pick up an OBD1 P72. The chipped P28 will work also but you will not have IAB control. swap in a Skunk2 intake manifold and that isn't a problem.

 

Great Thanks!

 

One last thing Relic 1, will the "JDM" OBD1 P72 ecu work okay or is it a totally different animal?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Slow93egg &raquo;</TD></TR><TR><TD CLASS="quote">One last thing Relic 1, will the "JDM" OBD1 P72 ecu work okay or is it a totally different animal?</TD></TR></TABLE>
A true JDM P72 will work fine as well.

 

ive been searching for like the past two days but couldnt really find anything...maybe im just using the wrong key words..but could u give me some links that would help me? im new to this kinda of stuff....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by on-the-line &raquo;</TD></TR><TR><TD CLASS="quote">ive been searching for like the past two days but couldnt really find anything...maybe im just using the wrong key words..but could u give me some links that would help me? im new to this kinda of stuff....</TD></TR></TABLE>

mechanically - http://www.c-speedracing.com/h...p.php

electrically - there area a load of links in here... https://honda-tech.com/zerothread/642479

USDM ITR in VX chassis (very close to what you need to do, only difference in the O2 sensor and that you need to add the VTEC lines) - https://honda-tech.com/zerothread?id=635782

USDM GSR in VX (again very close to what you need to do) - https://honda-tech.com/zerothread?id=644434

adding VTEC control - https://honda-tech.com/zerothread?id=724252


hopefully those get you started.

 

thank you for the links

 

use your factory dx harness. Its simple. it shouldnt take longer than an hour to add the extra wires you need. You buy a kit from whoever sells the kit i believe its like 20 bux and most people dont connect the knock sensor so if i were you i would run a p28.

VERY VERY SIMPLE. KISS ( KEEP IT SIMPLE STUPID) .

And if you use your factory dx injectors you dont even need to change the injector clips. THe only thing you have to change is the plug on the alternator from obd2 to obd1 and convert your obd2 distributer to obd1 ( they have instructions how to do this here on honda-tech) VERY VERY SIMPLE.

i learned the hard way and bought a place racing 300 harness. THen that harness was giving me issues so i bought a dx harness and converted it myself. it took me 1/12 hours.

 

so im better off going obd1 instead of going obd2 right? if i do this i cant use the jdm ecu right? i would need to purchase a p28...do i need to chip it?

 

if you have a p72 you can just chip it. AND YES YOUR ARE 100 times better off going obd1 in my opinion. Less hassles.