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obd0 to obd1

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Old Apr 18, 2007 | 05:45 PM
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Thumbs down obd0 to obd1

im doing b18a1 (obd0) swap into a 95 ex (obd1) . if i use an obd1 dohc ecu what do i need to change in the wire harnes on the engine?
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Old Apr 18, 2007 | 06:40 PM
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you will need to convert your motor to obd1, which is pretty simple. You will just need OBD1 b18b1 Dizzy, injectors, possibly header/cat, and you will need to remove your resistor box. If im forgetting something you will need to convert please list. Im not sure but you might need obd1 intake mani/throttle body.

OR, Some company might sell obd1 -> 0 conversion harness, which would be your easiest bet, if they sell them.
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Old Apr 18, 2007 | 07:07 PM
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Originally Posted by itsslow
you will need to convert your motor to obd1, which is pretty simple. You will just need OBD1 b18b1 Dizzy, injectors, possibly header/cat, and you will need to remove your resistor box. If im forgetting something you will need to convert please list. Im not sure but you might need obd1 intake mani/throttle body.

OR, Some company might sell obd1 -> 0 conversion harness, which would be your easiest bet, if they sell them.
+1 on the dizzy and injectors and o2(got one) ......you will also need a obd1 altenator, it would be a lot easier to use a newer intake manny( igot one with all the sensors fuel rail and obd1 injectors $40) you should be able to use the obd0 TB (i got 2 newer ones if you need ) that should be all you need

steve
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Old Apr 19, 2007 | 12:26 AM
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not all you said is tru...it depends on what you convert,i still run obd0 injectors ,altenator and sensors.
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Old Apr 19, 2007 | 01:01 AM
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You will need to do the following:

Use the 95 civic wiring harness, extend some wires if needed (injector wires).
Change the plug on the civic harness so that it has an obd0 alternator plug or get an obd1 alternator.

Concerning injectors, run obd1 sohc/dohc 240cc high impedance injectors so you dont have to wire in a resistor box.

If you only have the obd0 low impedance injectors, then wire in a resistor box to run those injectors.

You will need an obd1 distributor along with a 4 wire oxygen sensor if you want to use o2 feedback.
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Last edited by mtber; Apr 19, 2007 at 10:40 AM.
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Old Apr 19, 2007 | 10:31 AM
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Originally Posted by mtber
If you don't know exactly what your talking about, don't reply to a thread with false information.

You do not need to change your alternator, injectors etc.

All that is REQUIRED/Different is:
Obd0 to obd1 jumper harness
Ecu
Distributor needs to be obd1 or obd2a/b
Oxygen sensor is 4 wire instead of one, however on chipped obd1 ecus you can disable the o2 sensor, hence you dont need an o2.

The only time you would need different injectors is if you wanted to remove the resistor box. Stock obd0 injectors are low impedance 2-3 ohms, all low impedance injectors require a resistor box.
High impedance 12-13 ohm injectors do not.

if he is using a obd1 DOHC ecu in a obd1 car like stated in the post,why would he need a jumper harness? also plz correct me if i am wrong but i thought all odb1 cars dont have resistor boxes....which is why i thought he could not run the obd0 injectors


Originally Posted by SPOONCIVIC
not all you said is tru...it depends on what you convert,i still run obd0 injectors ,altenator and sensors.
you CAN run the obd0 alt. if you have the plug and you splice it into the wires. and you DONT need a newer manni but i use one just cuz its cleaner and not as clutered as the old style....but thats just me
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Last edited by luvsracin87; Apr 19, 2007 at 10:35 AM.
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Old Apr 19, 2007 | 10:37 AM
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Originally Posted by luvsracin87
if he is using a obd1 DOHC ecu in a obd1 car like stated in the post,why would he need a jumper harness? also plz correct me if i am wrong but i thought all odb1 cars dont have resistor boxes....which is why i thought he could not run the obd0 injectors




you CAN run the obd0 alt. if you have the plug and you splice it into the wires. and you DONT need a newer manni but i use one just cuz its cleaner and not as clutered as the old style....but thats just me
4:30 am reply owned me.
I mixed up his thread with one I was replying to on honda-tech.com

I will modify my original reply.
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Last edited by mtber; Apr 19, 2007 at 10:43 AM.
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Old Apr 20, 2007 | 11:43 AM
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youll need 94 up integra mounts or hasport, change injectors, and a hydro tranny, a 4 wire o2 sensor and a 92 up b18 distributor
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