I have a 98 civic dx and I was wondering what I would need to do as far as wiring, to put and obd1 motor into it. I have tired to search but I can't really find anything.

thanks

 

Anybody?




Modified by 98EJ at 3:46 AM 4/10/2003

 

It would help to know what OBDI motor you are talking about possibly using in the 98 DX. To be general and brief, you'll need to swap over an OBDII oil pump for the Crank fluctuation sensor, then use the OBDII injectors and distributor.

 

Probably a jdm b18c (gsr) motor. Would I still need to switch all that stuff If i was using an obd1 ecu.


[Modified by 98EJ, 3:33 PM 4/2/2003]

 

First off you would be reworking your Civic's harness to fit the B18C... After adding in VTEC, VTM, KS, etc you would have to decide what you wanna do about the injector and distributor... Between OBD1 and OBD2 distributors and injectors there are no internal differences besides the connectors... I would just move your Civic's D16Y7 injectors over to the B18C (D series and B series all run the same 240cc injectors so there's nothing to worry about) As for the distributor you have a few choices... Either cut the connector off your JDM harness and solder it to your Civic's engine harness or cut your D16's and B18C's female distributor connectors off and solder on the Civic one... Moving your Civic's over is probably easier since all the colors should just match up but then again you're basically ruining your D16's distributor... I would prefer the second method but that's only because I am very very picky about wiring and it has to be perfect... The OBD2 single style connector just looks cleaner to me... Anyways if you did that much you would be set to run an OBD1-OBD2a harness convertor... If you're talkin about the B18C (as in like our USDM B18C1 but with the higher compression pistons) I would probably just run a GSR computer since you will need IAB control... I personally love the C1's manifold but I hate the IAB's so I always pull them out even tho you lose midrange power... Doing so for me, or running on the other B18C (JDM ITR) I would just run a chipped P05/06/07/28 (something along those lines) To me a stock GSR ECU just feels like it bogs the motor... The VTEC x-over (4400) is too low especially if you are running CTR/ITR cams... After VTEC the motor doesn't seem to pull till the IAB's open up at 5700... That's why those gotta go for me... hehe... Anyways my bad about rambling on but with everything said that's all you really gotta do... Good Luck

 

If the injectors for the D and B series are the same, would he be able to move over the fuel rail as well? From what I could see, the only diference is where the FPR mounts and the on/off set of the orifice for the fuel.

paul

 

The fuel rail from a D series will not fit on a b series manifold.

 

funny, about 3 people emailed me this same exact question at the beginning of this week and here's the info I relayed back to them:

"If you want to use an OBD1 B16A engine in an OBD2 equipped vehicle (such as yours), then you'll have to:

1) Reuse your existing OBD2 engine harness and add the respective VTEC wiring and Knock sensor if you own a non-vtec 96-00 civic...OR... find a 96-98 EX engine harness which already has the vtec wiring & knock sensor embedded into it.

2) Find a set of B-series OBD2 injectors...OR... or cut & splice the OBD1 injector plugs and adapt them to your OBD2 engine harness.

3) Find a 96-00/OBD2 B-series alternator ...OR... sell/trade the OBD1 B-series alternator for a 96-00/OBD2 B-series alternator. The plug is a square type on the 96-00 alternators and has 1-2 more wires leading to it, whereas the OBD1 alternator plug is a bigger round plug and has less wiring going to it. So there might be an issue if you try to rewire it...your best off fnding an OBD2 B-series alternator though.

4) Find a 96-98/OBD2 B-series distributor which will plug n' play w/your DX engine harness....OR...they say you can convert your OBD2 distributor plug to OBD1 spec by repin it to a dual OBD1 plugs and will accept & utilize an OBD1 distributor. I've never done this myself and I find a big pain in the *** (I personally hate rewiring stuff)....I suggest you find a 96-98 B-series distributor to make life easy on yourself.

5) ECU.
If youd like to go OBD1 ecu, purchase a 96-98/OBD2-->OBD1 ecu jumper and simply use an OBD1 ecu. JDM OBD2 ecu's programming is similiar to OBD1 programming as far as looking at sensors. It looks at the same exact sensors an OBD1 ecu does.......but for the US version of OBD2 ecu's programming, they look for a few more sensors which makes OBD2 a hassle.
US OBD2 ecu's look for these additional sensors:
- CKP (an integrated crank sensor thats found & embedded on the oil pump)
- 2nd 02 sensor

The CKP sensor is the big downer, since OBD1 and JDM OBD2 engines do not have this sensor. If you want to add this sensor, you need to change your oil pump to a US spec 96+ B-series oil pump. Again, you can easily avoid all this frustration & wasted $$$ if you go with a JDM 96-98 ecu or the OBD1 route.




[Modified by Katman, 2:43 PM 4/2/2003]

 

Katman, you covered it all once AGAIN... Sorry I totally forgot to mention the alternator... but yea finding an OBD2 one is probably the easiest... Peace

 

 

Katman - yet another reason I'm proud to be a honda-tech member!

 

Wow! thanks for all of the information.
So my d-series injectors actually won't work?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98EJ &raquo;</TD></TR><TR><TD CLASS="quote">Wow! thanks for all of the information.
So my d-series injectors actually won't work?</TD></TR></TABLE>Why do you say that??? Yes they will... they are the exact same as OBD2 B series and they are both 240cc's... Latez

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kataku2K3 &raquo;</TD></TR><TR><TD CLASS="quote">Why do you say that??? Yes they will... they are the exact same as OBD2 B series and they are both 240cc's... Latez</TD></TR></TABLE>

Oh, okay I just got a bit confused when Katman said to find a set of obd2 b-series injectors above.

 

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

Oh, okay I just got a bit confused when Katman said to find a set of obd2 b-series injectors above.</TD></TR></TABLE>

I say that to be on the safe side for the **** engine swapper who feel they need to tottally make sure that everything is 100% B-series on their B-engine. You can use your D-series injectors though.

 

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

"If you want to use an OBD1 B16A engine in an OBD2 equipped vehicle (such as yours), then you'll have to:

1) Reuse your existing OBD2 engine harness and add the respective VTEC wiring and Knock sensor if you own a non-vtec 96-00 civic...OR... find a 96-98 EX engine harness which already has the vtec wiring & knock sensor embedded into it.

2) Find a set of B-series OBD2 injectors...OR... or cut & splice the OBD1 injector plugs and adapt them to your OBD2 engine harness.

3) Find a 96-00/OBD2 B-series alternator ...OR... sell/trade the OBD1 B-series alternator for a 96-00/OBD2 B-series alternator. The plug is a square type on the 96-00 alternators and has 1-2 more wires leading to it, whereas the OBD1 alternator plug is a bigger round plug and has less wiring going to it. So there might be an issue if you try to rewire it...your best off fnding an OBD2 B-series alternator though.

4) Find a 96-98/OBD2 B-series distributor which will plug n' play w/your DX engine harness....OR...they say you can convert your OBD2 distributor plug to OBD1 spec by repin it to a dual OBD1 plugs and will accept & utilize an OBD1 distributor. I've never done this myself and I find a big pain in the *** (I personally hate rewiring stuff)....I suggest you find a 96-98 B-series distributor to make life easy on yourself.

5) ECU.
If youd like to go OBD1 ecu, purchase a 96-98/OBD2--&gt;OBD1 ecu jumper and simply use an OBD1 ecu. JDM OBD2 ecu's programming is similiar to OBD1 programming as far as looking at sensors. It looks at the same exact sensors an OBD1 ecu does.......but for the US version of OBD2 ecu's programming, they look for a few more sensors which makes OBD2 a hassle.
US OBD2 ecu's look for these additional sensors:
- CKP (an integrated crank sensor thats found & embedded on the oil pump)
- 2nd 02 sensor

The CKP sensor is the big downer, since OBD1 and JDM OBD2 engines do not have this sensor. If you want to add this sensor, you need to change your oil pump to a US spec 96+ B-series oil pump. Again, you can easily avoid all this frustration & wasted $$$ if you go with a JDM 96-98 ecu or the OBD1 route.</TD></TR></TABLE>

OK...so here's our situation.
Recently swapped an OBD1 JDM GSR motor into my buddy's OBD2 99 Dx coupe. Motor turns over...but does NOT start.

From your list above Katman

1) Using a 99-00 Si engine harness

2) Re-using his stock OBD2 injectors from the D16Y7 motor.

3) We swapped the OBD2 alt plug wires over to the OBD1 green plug. (4 wires total...all had matching colors)

4) Purchased an OBD2 B16A2 dizzy didn't work, and have also tried rewiring the OBD1 dizzy wiring still no luck.

5) Using the P72 jdm ecu that came with the motor, (hmotorsonline.com) and OBD1 - OBD2 conv/jumper harness for the OBD2 Si engine harness.

Please help...this has turned into a six week project...and he needs this thing running.

Thank you.

 

If he uses the DX harness won't he have to also have convert over to a 2 wire IACV plug also? Katman is the bomb

 

We're using the 99-00 Si harness.

 

also if you want to use the OBD1 alternator

 

oops just read your above post

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaPartsHero &raquo;</TD></TR><TR><TD CLASS="quote">also if you want to use the OBD1 alternator</TD></TR></TABLE>

Whoa...didn't know you could do it that way...I swapped the plugs...the four wires had the same colors.

 

what if....... i wanna go obd 1. use my stock d16y7 car harness and just get the obd1&gt;obd2a ecu converter? then wire up vtec.... or is there no hope there? im sooo confused right now... first time swap. wiring is the only part im confused with though..

 

1) Reuse your existing OBD2 engine harness and add the respective VTEC wiring and Knock sensor if you own a non-vtec 96-00 civic...OR... find a 96-98 EX engine harness which already has the vtec wiring & knock sensor embedded into it.

2) Find a set of B-series OBD2 injectors...OR... or cut & splice the OBD1 injector plugs and adapt them to your OBD2 engine harness.

3) Find a 96-00/OBD2 B-series alternator ...OR... sell/trade the OBD1 B-series alternator for a 96-00/OBD2 B-series alternator. The plug is a square type on the 96-00 alternators and has 1-2 more wires leading to it, whereas the OBD1 alternator plug is a bigger round plug and has less wiring going to it. So there might be an issue if you try to rewire it...your best off fnding an OBD2 B-series alternator though.

4) Find a 96-98/OBD2 B-series distributor which will plug n' play w/your DX engine harness....OR...they say you can convert your OBD2 distributor plug to OBD1 spec by repin it to a dual OBD1 plugs and will accept & utilize an OBD1 distributor. I've never done this myself and I find a big pain in the *** (I personally hate rewiring stuff)....I suggest you find a 96-98 B-series distributor to make life easy on yourself.

5) ECU.
If youd like to go OBD1 ecu, purchase a 96-98/OBD2--&gt;OBD1 ecu jumper and simply use an OBD1 ecu. JDM OBD2 ecu's programming is similiar to OBD1 programming as far as looking at sensors. It looks at the same exact sensors an OBD1 ecu does.......but for the US version of OBD2 ecu's programming, they look for a few more sensors which makes OBD2 a hassle.
US OBD2 ecu's look for these additional sensors:
- CKP (an integrated crank sensor thats found & embedded on the oil pump)
- 2nd 02 sensor

The CKP sensor is the big downer, since OBD1 and JDM OBD2 engines do not have this sensor. If you want to add this sensor, you need to change your oil pump to a US spec 96+ B-series oil pump. Again, you can easily avoid all this frustration & wasted $$$ if you go with a JDM 96-98 ecu or the OBD1 route.


If you use the Y7 harness you'll have to convert it to a 2 wire IACV in addition to the above.

 

ok...... and i have a JDM p73 ecu.... what steps does that delets now? lol... sry... im easily confused when it comes to wiring.... it has to be perfect or no work

 

i have a 94 gsr motor in a 97 civic, and it was a headache at first. this info is great though