97civicgc

I currently have a civic with a d16y7 in the car. I want to put a D16Z6 in the car.

I purchased a d16z6, p28 ECU, obd2a to obd1 harness, z6 wire harness, and a d16y8 transmission.

I am wondering what I have left to purchase to swap this motor into my car?

Also, will it be just as simple as dropping the z6 in and plugging in the harness? Or will there be some re-wiring I'll need to do?

97civicgc

Okay, after doing some reading it seems I cannot use my OBD1 D16Z6 wire harness in my OBD2A car?

JDM_902

I haven't done a z6 swap into a obd-2 car but I did an obd-1 LS swap in my car (obd-2) and I didn't need a whole different harness. Just had to repin a few wires going into the ecu for IACV and changed a few plugs in the engine bay (alternator, dizzy, injectors, etc.) That obd-2 to obd-1 harness you have will save alot of time though.

97civicgc

Just finished reading the FAQ.

It seems I need to get an OBD2A 5 speed vtec harness.

Also it seems that I need to use OBD2A Injectors, Dizzy, and alternator.

If I get the OBD2 harness will I still need to convert the IACV from 3 wire to 2 wire?


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Or would it be eaiser / smarter to just drop a y8 in?

Xathine

iTrader: (2)

Um, I don't think you need to replace dizzy, injectors etc with OBD1 stuff. Think you just have to splice your harness to wire them up correctly?

Not sure on the IACV.

Anyone else? I'm curious as well.

94EG8

If you use a '96 - '98 5 speed EX engine harness, the only wiring you will need to do is to swap the connector the intake air tempertature sensor, and possibly extend that wiring (if you use a Y8 intake or cold air intake, or short ram you wont even have to do that provided you use an OBD2 style IAT in the intake piping.) And yes you need, or at least should use OBD2A distributor (you will need to swap the guts from your old Y7 distributor into the Z6 case, no stock distributor fits), injectors and alternator (only the distributor changed between OBD2A and OBD2B) otherwise you will need to hack up your harness. Overall better choice is the Y8 for ease of installation and passing emissions if that happens to be a concern for you.

97civicgc

Emissions isn't of concern here.

So I need a different harness, and the OBD2 vtec dizzy, injectors, and alternator.

I'm swapping in hopes of doing a small boost setup. I've been reading that the z6 is overall the best SOHC for boost. I've also read that the y8 has oil flow problems? - but didn't read much on it.

94EG8

You can reuse the Y7 alternator. The injectors as well, although if you're turboing I suspect you'll be using bigger injectors anyway (you can also remove the blue insert in the OBD2 injector clips and they will fit on the OBD1 injectors, but you will have to tywrap the clips on). The distributor has to be custom though, no OEM honda distributor both bolts to the head, and plugs into an OBD2A engine harness. You can simply take both distributor apart though and swap the CYP/CKP/TDC sensors to makes something that looks 100% OEM

From what i've read your right on both counts, the SOHC Vtec ZC should work about as well too, its basically a D16Z6. And yes the Y8s are supposed to have oil issues and are well known for spinning rod bearings.

97civicgc

Damn, looks like a HUGE pita.

Any idea on how difficult it would be for a novice like myself to take apart two dizzys and frankinstein them into one?

em Dot

iTrader: (1)

instead of opening up the distr. just re-pin the z6 one with the y7 plug. the IACV needs to be converted to a 2 wire plug if using your dx harness, and if you're going to drive it for a while NA, DO NOT use the y7 injectors. they are only 190cc, while the z6 is 235cc. so splice in obd-1 clips since you're going to need them anyway if you run DSMs, RCs, Precision, etc.

Like you said, from my experience, the y8 suffers from BAD oil starvation bc the pump fails. z6, ZC, or jdm D15b vtec is the way to go.

94EG8

I've personally tried that before and was never happy with the results, the actual pins are slightly different and don't lock into the connector shell properly. The distributors themselves are built like lego anyway, other than the 2 pronged cam on the end that you can 180 out when reassembling the distributor everything else is pretty much idiot proof.

that it does, although I had gotten the impression that the OP was planing to use a manual EX harness meaning that he wouldn't have to preform the IACV fix.

Has anyone ever confirmed the flow rates? I've heard that before, and the part numbers are different between Y7 and Y8 injectors.

em Dot

iTrader: (1)

yeah its been debated on D-series.org over and over lol. i do remember using them in my ek i had a few years back on a z6 motor and it ran lean and was quite noticeable on the spark plugs (completely white). ended up splicing the obd1 clips in and running the z6 injectors.

Ser1N

iTrader: (1)

The y7 injectors are a fact 190cc and the Y8 are 240CC
I failed smog using the Y8 injectors on my y7 (the y7 got messed up dont ask) so i got some from craigslist HEARING they were the same.

When i used the y8 injectors i got rich code plus it killed what cat i had left cause it was running far to rich ( but i had to get to work and back while y7 ones came in) once i put the y7 ones in , it ran smooth again. I also think theres some kinda color difference on some of the plastics on the y7 then y8 , i think one is green and one is red?

Xathine

iTrader: (2)

Could he use an OBD1 dizzy and just get a dizzy jumper harness from rywire.com?

NOman0608

I had a obd2 b16a2 in my EM1 and swapped it with a OBD1 b16a from Xsi. (Before you say why did I put a older motor in it this and that bullshit, It was because Piston rings were gone as well as few things.).

I only swapped oil pump (crank sensor) and dizzy.

Everything else plugged in just fine.

I assume you could do the same, unless d series is different.

Xathine- I would not see why he couldnt. I have heard people use rywire, and have no problems.

Xathine

iTrader: (2)

Hmm, I also have a OBD2A car, and plan on swaping an OBD1 motor into it.


Seems like a HUGE pita.

Deetz

My 96 CX hatch was obdIIA.....i got a jumper harness, and a pr4 ecu for my B20Z......was a plug and play swap, so easy

Xathine

iTrader: (2)

Hmm, I've come across a few people that didn't swap out alternator, dizzy, and injectors...

94EG8

Yes. But I don't know why anyone would bother, IMO the distributor harnesses look clunky and hacked together (i'm not saying they're a bad idea, but you can tell its not OEM honda at a glance) Especially when you can make something that looks 100% OEM, because its made with 100% OEM parts for free, AND has one less point of failure (distributor adapter harness is one more thing to fail, unlikely as it may be)

em Dot

iTrader: (1)

speaking from experience, thats the things i swapped out. you dont necessarily have to if you splice obd1 clips to the obd2 harness.