Well, I have an 88 rex very clean , and its got a d16y7 with the great and wonderful DPFI This is my second CRX but it was an si.I have searched for all of the parts that I will need for the swap. (d16y7 mani, OBD-0 injectors, resistor box, and that stuff, but I have a few questions before I dig into it. Also, I have searched for about 8-10 of the best write ups on this and have printed and studied them for a few weeks now.


1. -Will all the d16y7 mani sensors work properly as OBD-0? ex. EACV, MAP, others?)

2. -Will I need a shorter throttle cable? or will the longer DX one work?

3. -Will a "PM6" ECU work without problems?

4. -Can I use some OBD 2 injectors on this setup somehow? Is there any benefit to this?

5. -Is there any extra special d16y7 things I should know about this specific swap? As apposed to a CRX\civic based d15, or other d16


Any help for any one of these questions would be very helpful, Please give me any info about this.. Also I would like to post some pics of my setup, but im not sure how to do that on this board as im somewhat new to posting. (not to searching though )

Thanks for <U>any</U> input or help offered.

-Jeff


Modified by CRX+MaAN at 9:05 PM 10/23/2005


Modified by CRX+MaAN at 3:14 AM 10/24/2005

 

if you are using obd1 injectors, you dont need a resistor box. and the pm6 ecu is obd0. you can use the manual trans from your rex or from the other engine, but use the crx shift linkage.

1. they will work right as obd1, but not with an obd0 computer. either convert the plugs to obd0, or convert your chassis harness to obd1.

2. use the dx shift linkage.

3.no. as stated in the above paragraph. obd0 ecu not = obd1 engine.. unless you chip it.

4. if oyu go obd1, then yes, otherwise, no. and you will still have some wiring to go from dpfi -mpfi anyway to run the extra 2 injectors.

5. not particularly. you just need to pic an obd and go with it. i would suggest getting a obd1 computer to run the engine, because in the long run it is better to tune with. but that also means converting your distributor plugs to obd1, converting your engine harness to run 4 injectors instead of 2, and setting up the wiring for a 4 wire o2.

basically what you should search for is mini me swap.. because that is basically what you are doing, even though you are also swapping the block.

 

My bad I said I had OBD-1 injectors when I actually have a set of OBD-0 and a set of OBD-2's Please let me know of any advise even though I explained it wrong the first time

 

there is no benefit in using obd-2 injectors (same fuel output)240cc i believe... from experience the only thing that you dont use wid that setup is you loss the resistor box... but you will get the electric overload cel...hopefully it will be gone when i use obd-0 injectors...
that is why i will be using for my z6 swap obd-0 injectors w/ resistor box...

 

So let me clarify...
You've got a DX or DPFI and you're wanting to put in D16y7 block while doing a MPFI conversion?

If this is the case, just use the D16y7 block/head but all the MPFI/Intake stuff from a obd-0 D16a6.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by davens &raquo;</TD></TR><TR><TD CLASS="quote">So let me clarify...
You've got a DX or DPFI and you're wanting to put in D16y7 block while doing a MPFI conversion?

If this is the case, just use the D16y7 block/head but all the MPFI/Intake stuff from a obd-0 D16a6.

</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by davens &raquo;</TD></TR><TR><TD CLASS="quote">So let me clarify...
You've got a DX or DPFI and you're wanting to put in D16y7 block while doing a MPFI conversion?

If this is the case, just use the D16y7 block/head but all the MPFI/Intake stuff from a obd-0 D16a6. </TD></TR></TABLE>

- Checkout http://www.rywire.com for the wiring.
It can be a bit tricky for some.

 

Thank you for the input, im just worried about all the wiring, but basicaly the d16y7 will be just like doing the swap on any other d16? and it will all run fine on OBD-0? The d16y7 is already in my car, and has been on the DPFI for a while now Thanks 92integra_gs, I will go with the OBD-0 injectors. So will I need a shorter throttle cable since my current DX one streches most of the way across the whole engine bay?
Thanks again guys!

 

So the previous owner did the swap like we're talking, except they chose the DPFI. They bolted all the obd-0 DPFI parts to the y7 block/head. So you're just doing a DPFI to MPFI swap.

 

Correct, so theres nothing special I should have to worry about? all the sensors will perform just fine with ODB-0?

 

If there were sensors on the y7 block/head that had to be modified, whoever did your previous y7 install took care of it because you're already running DPFI obd-0.
Wiring and plugs on the MPFI obd-0 isn't that different then the DPFI.

 

Thanks I hope so. Am I going to need to find a DX throttle cable, and how hard are they to rip out and replace? I am pretty sure the one im running right now is way too long.. it goes over the block and then some, while the DX comes out of the firewall and right where it needs to go.

 

BUMP for unanswered questions please

 

anyone else have any suggestions?

 

i have this swap in my crx ecpt i used a6 intake manifold to keep it obd0, the only prob you will run into is the temp sensor that is normally on the back of the a6 block but on the y7 you will need a y8 thermo housing with a brown plug and you will need to run the wires for your temp sensor to the brown plug insted of the back of the block.

 

Thank you uselesslabel, I thought about this and wondered what I was going to do. So with this y8 thermo housing, I will not need the IAT(S) anymore? Is that some type of sensor that only comes with the y8 mani.? Where do I plug in this brown plug at? The back of my y7 block? Are there any other modifications I will need to make for this y7 MPFI swap to go smoothly?
Thanks for any help!

 

Jeez...
Since the y7 is already in the car and running, why don't you go look and see where the IAT and coolant temp sensor are plugged into?

I would assume the step uselesslabel in talking about was done when the y7 was installed.

You will need to move the IAT to the MPFI manifold. The coolant temp switch should be on the thermostat housing...it stays there. Or even if its on the back of the block, it stays there.

Quit getting tied up in y7 install problems and start thinking dpfi to mpfi conversion.

 

Whats does the thero housing look like?

 

Okay, if you don't know...or better yet, lack the skills or means to find out where the thermostat housing is, maybe you should rethink doing a MPFI swap yourself. It's not that easy.

 

Well it does look pretty easy judging by the 8 or 9 writups I have printed out and studied, but they are not for the y7, which has no IAT.. So its just a little confusing so please stay with me on this as I am planning on doing it this or next weekend, and I just want it to start up when I finish

 

For the last frickin time...the y7 block has nothing to do with the swap you are asking about.


You think the mpfi is easy...great. You shouldn't have any problems than.

 

Well I think it does since my y7 mani has no IAT on it, so what do I do with that plug? let it hang?

 

Time out.
Are you, or are you not, running a obd-0 DPFI intake on a D16y7 engine?


Better yet, go read the ID code off the side of your ecu so we can get to the bottom of this(PM6, PM5, P28 etc)

 

Well thank you for the help first off.. I am running a pm5(CRX DX manual) with an ODB-0 DPFI d16y7 setup. Also I have a y7 mani setup with OBD-0 injectors and a resistor box, but the mani has all of its stock sensors ect.

 

Okay, if you're running the obd-0 DPFI, it has the IAT sensor in the manifold.
If you use an obd-0 MPFI manifold from a D16a6, it has a place for a the IAT Sensor. This is just one of the reasons I said to use the entire obd-0 MPFI setup. Manifold and all..
You're thinking about running the y7 manifold? Why on Earth would you want to do that? It doesn't offer any performance gains and it makes the swap harder.
If the only reason that you're not using an A6 manifold is that you don't have one, I'll sell you one real cheap. I've got like six. PM me.


Modified by davens at 5:27 PM 10/28/2005