I am putting my Z6 into a 90 EF hatch, which currently has the DPFI D15B1 engine in it. Since the engine is coming out, would it be better to go ahead and take the EF harness out and put in a 92-95 VTEC wiring harness, or is it better to get an OBD0 to OBD1 conversion harness?

I just figured since the engine was going to be out, and a few other things are coming out (A/C, and whatever else not needed), I figured it might just be easier to use the VTEC wiring harness. Any comments/ideas?

 

ill be doing the exact same swap soon and i think it would be better to go with OBD1, staying OBD0 is kinda ghetto cause you gotta hack up your dizzy, and have a ghetto vtec switch. just go to http://www.rywire.com and get their OBD1 VTEC conversion harness and you are done.

altho i think you will need a A6 Si harness for that cause your stock harness is only DPFI. i was under the impression that you dont have to use the Z6 harness at all. someone correct me if im wrong.

sorry not sure if i answered your question.....

 

^^Yeah you did a little. I was just figuring that since I have the Z6 full wiring harness/ECU/everything, that it would just be better for me to put the Z6 harness (from ECU into engine bay) into the EF. I'm just wondering how that would work with all the other wires coming from the ECU. Maybe I need the conversion kit??

The EF is going to end up getting stripped eventually

 

Ok, so I've read around a bit, and sounds like you need to convert from DPFI to MPFI, then get the OBD1 conversion harness, then add wires for VTEC, and probably 4 wire o2 sensor.

With all that said, wouldnt it just be easier for me to rip the EF DX engine harness out, and replace it with the Z6 wire harness?

 

ripping out the dash harness is a pita , atleast i thought so, i just added the 4 or w/e wires for mpfi, and bought the obd0-obd1 conversion harness. DONE DEALl

 

^^What engine did you put in though? B/c I'd still have to wire VTEC, and I think something for the dizzy too. Bah, I need to sleep, then read more. My head hurts.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboGoKart &raquo;</TD></TR><TR><TD CLASS="quote">Ok, so I've read around a bit, and sounds like you need to convert from DPFI to MPFI, then get the OBD1 conversion harness, then add wires for VTEC, and probably 4 wire o2 sensor.

With all that said, wouldnt it just be easier for me to rip the EF DX engine harness out, and replace it with the Z6 wire harness? </TD></TR></TABLE>

Dude trust me (and loads of others will agree) converting to MPFI and running Vtec wires is SOOOOO much easier than switching out an entire harness, I have done both so I am not just guessing. So much stuff has to be messed with to remove the harness not too mention the Z6 harness is very likely to not match up w/ alot of things in the cabin.

The main reason people think switching harnesses is easier is because they are afraid of messing up the wiring doing the conversion, there is more to mess up switching harness's IMO. The simplest way is to convert to MPFI (4 wires to run) get a rywire OBD0 to OBD1 conversion harness for a p28 ECU (plug and play and works with all other OBD1 vtec ECUs). and that's all the wiring you'll have to worry about, piece of cake.

 

http://www.angelfire.com/d20/h....html

if you want to attempt it yourself, then you can just buy the obd0-1 harness and add the extra sensors (vtec pressure switch and vtec solenoid). You don't have to hack up your dizzy harness just swap the plugs over or use an adaptor.

 

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

Dude trust me (and loads of others will agree) converting to MPFI and running Vtec wires is SOOOOO much easier than switching out an entire harness, I have done both so I am not just guessing. So much stuff has to be messed with to remove the harness not too mention the Z6 harness is very likely to not match up w/ alot of things in the cabin.

The main reason people think switching harnesses is easier is because they are afraid of messing up the wiring doing the conversion, there is more to mess up switching harness's IMO. The simplest way is to convert to MPFI (4 wires to run) get a rywire OBD0 to OBD1 conversion harness for a p28 ECU (plug and play and works with all other OBD1 vtec ECUs). and that's all the wiring you'll have to worry about, piece of cake.</TD></TR></TABLE>

Thank you! The more I read, the more I realized how it's just easier to do what you said. One thing - even if I get the rywire conversion harness, I will still need to wire in VTEC, right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaPartsHero &raquo;</TD></TR><TR><TD CLASS="quote">http://www.angelfire.com/d20/h....html

if you want to attempt it yourself, then you can just buy the obd0-1 harness and add the extra sensors (vtec pressure switch and vtec solenoid). You don't have to hack up your dizzy harness just swap the plugs over or use an adaptor.</TD></TR></TABLE>

Great link! Thanks!

About the dizzy, you're saying I can just cut the DX plugs off and wire the Z6 plugs on? A Z6 is going in this DX.

 

what ever floats your guyz boats me personally i hate splicing and cutting wires and routing wires from ecu's to engine bays and **** i would put in the extra elbow grease and pull out old harness and put in the z6 harness thats just me

 

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

Thank you! The more I read, the more I realized how it's just easier to do what you said. One thing - even if I get the rywire conversion harness, I will still need to wire in VTEC, right? </TD></TR></TABLE>

The vtec wires would be in the OBD harness already, rywire prewires it for you.
and as far as the dizzy goes, I would repin your hanress, not cut of the plugs. it's just alot cleaner this way and looks OEM. or you can get a harness, I say no way to cutting dizzy wires unless there is NO other way (usually there is though)

 

Question about the crank angle sensor wiring:

I know to move C1 to B10, and C2 to B12, then run C1 and C2 to distributor. One write-up said there are 2 unused pins on the Si distributor, and C1 and C2 go there. Is that the same on the Z6 distributor? Or where should C1 and C2 go if I'm going straight to a Z6 distributor.

Or do I need to run the whole mess of dizzy wires for the Z6 distributor into the ECU?

 

I used this and just ran all my wires to my ecu because i felt more comfortable (dont ask why) , then i just ran vtec wires , and reversed tps outer wires, ran wires for new four wire o2 sensor, and kabaaaam done. MY motor was a d15bvtec,


OBD0......OBD1
------------------
[b10].......[b11] --&gt; cyp P aka cylinder position
[b12].......[b12] --&gt; cyp M aka cylinder position
[c3].........[b13] --&gt; tdc P aka top dead center
[c4].........[b14] --&gt; tdc M aka top dead center
[c1].........[b15] --&gt; ckp P aka crank position
[c2].........[b16] --&gt; ckp M aka crank position
[b15].......[a21] --&gt; Ignitor signal

 

So those 2 plugs pictured are the DPFI plugs? Or the Z6 plugs?

Or is that how my Z6 plugs should be wired? I think that's it.

I'm sorry, I know I sound like a total noob, this part is just confusing me.

 

Nevermind, I'm pretty sure I've got the distributor wiring now.

http://www.rywire.com/store/im...r.gif

At the very bottom of that picture it explains how to wire on the OBD1 distributor plugs. Probably the same thing that you posted Jonkee, it just makes more sense on this link.

 

Okay, I've been confused on this too. I have:

'91 Si hatch
D16Z6 (just the engine)

if I get a P28 and the rywire ODB0-to-ODBI conversion harness, and an ODBI distributor, can I just use the A6 harness, p-n-p with the rywire harness? Or will I need to hack up a Z6 harness for the plugs?

Peace
policy

 

How about some easier questions, lol.

1. Most write-ups say it's good to have an extra MPFI harness laying around to take parts from. I have an extra Z6 harness laying around. Can I use that?

2. Do I need OBD0 injector clips, or can I cut those off of the old Z6 harness since I'm going OBD1 anyways? Or would MPFI injector clips (OBD0) be better to use since I'm using peak and hold injectors in the end? Because my resistor box is already connected to the OBD1 injector clips.




Modified by TurboGoKart at 6:59 PM 3/30/2007

 

obd0 mpfi and obd1 uses the same injector clips