first off, i might be able to get a great deal on a d16y8 from a friend who is in the process of swapping to a gsr. so i was wondering what is involved in swapping his stock engine (sohc vtec d16y8) into my crx dx. i've been digging in the archives for the past hour and found nothing but conflicting info. so i was wondering if anyone out there who has done this swap could help me out. and on to the questions:

<u>w i r i n g</u>
i've read that i can either leave it obd0 or obd1. with obd0, i will have to do a dpfi-&gt;mpfi conversion and use a vtec controller. with the obd1, i could use the y8 distibutor and injectors, i would also need to get an obd1 ecu and then use an obd0-&gt;obd1 conversion harness. is this all correct? and from your experience, is there anything else i should know about the wiring?

<u>t r a n s m i s s i o n</u>
again, with the tranny, i have two options, either cable or hydro. since this is my budget project, what i have to work with is either the crx dx tranny or the y8 tranny. with the crx dx, i've read that it is a direct bolt on to the y8 block, is this true? if so, this seems to be the easier choice, but would the y8 tranny give me better performance? and with the y8 tranny, what is involved in converting to a hydro tranny? i couldnt find much on this.

and as for dropping the motor in, it is a direct bolt-on using a combination of the y8 and crx mounts, correct? and i think that is all for now, thanks for taking the time to get this far. if you can help, lemme know, thanks.


<u>cliff notes</u>
- d16y8 swap into crx dx
- wiring - obd0 or obd1
- tranny - crx or y8

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cornhusker &raquo;</TD></TR><TR><TD CLASS="quote">i've read that i can either leave it obd0 or obd1. with obd0, i will have to do a dpfi-&gt;mpfi conversion and use a vtec controller. with the obd1, i could use the y8 distibutor and injectors, i would also need to get an obd1 ecu and then use an obd0-&gt;obd1 conversion harness. is this all correct? and from your experience, is there anything else i should know about the wiring?</TD></TR></TABLE>

There's no way around the DPFI wiring not matter what OBD you choose to go with. That is unless you were to reuse the DPFI intake manifold, but I would really avoid that at all costs. The benefits of changing to OBD1 would be that you could use a P28 ECU which would control the VTEC function and provide proper air, fuel, timing, etc.
If you choose OBD0, then you will need a VTEC controller, MSD or some type of RPM activated switch to engage the VTEC. An Apex-i or Field's VTEC controller would be better since you can do some minor fine tuning with it.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">again, with the tranny, i have two options, either cable or hydro. since this is my budget project, what i have to work with is either the crx dx tranny or the y8 tranny. with the crx dx, i've read that it is a direct bolt on to the y8 block, is this true? if so, this seems to be the easier choice, but would the y8 tranny give me better performance? and with the y8 tranny, what is involved in converting to a hydro tranny? i couldnt find much on this.</TD></TR></TABLE>

The Y8 tranny would be better but it will not fit your car. There are no mount kits available to put a D series hydro tranny into an EF. You would have to make a custom upper tranny mount and rear bracket. Then you would either need to get part of the HASport EF hydro kit to activate the engagement fork or install the hydro setup from a 92+ Civic. All in all it's really not worth all the work. An Si cable tranny would be a good solution although it's just slightly better than a DX tranny's gearing.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">and as for dropping the motor in, it is a direct bolt-on using a combination of the y8 and crx mounts, correct?</TD></TR></TABLE>

You will reuse the driver's side mount bracket and mount from your stock motor on the Y8. Then of course reuse the stock upper, front and rear tranny mounts.

 

thanks for the quick response! with the tranny, i am prolly gonna stick with the crx dx, from the info on these two sites, it looks like the dx tranny and si tranny are almost exactly the same except for the final drive (but i dont know how reliable this site is). with the dpfi-&gt;mpfi, i am a little confused. i thought that if i am going to use the y8 manifold, distributor, and injectors, and using an obd1 ecu and conversion harness that i would not need to do a typical dpfi-&gt;mpfi conversion (as seen here). lemme know if i am still missing something here.


Modified by cornhusker at 1:07 AM 1/26/2004

 

Well a "typical" DPFI to MPFI swap would include using a resistor box with the injectors. If you are going OBD1, then you would eliminate that but you will still need to run the 2 wires for the extra injectors, switch the outer TPS wires, etc. You will also have some extra wiring to do by going OBD1 like converting to a 4 wire O2 sensor, distributor wiring, etc.

 

ohic, is possible to use a custom obd0-&gt;obd1 conversion harness get get rid of some of the wiring issues?

*edit*
another question, which wiring harness would i use for this swap? the y8 harness or the dx harness? if i have the option, which is easier?




Modified by cornhusker at 6:20 PM 12/17/2003

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cornhusker &raquo;</TD></TR><TR><TD CLASS="quote">ohic, is possible to use a custom obd0-&gt;obd1 conversion harness get get rid of some of the wiring issues?

*edit*
another question, which wiring harness would i use for this swap? the y8 harness or the dx harness? if i have the option, which is easier?</TD></TR></TABLE>

I think the only benefit of using a custom conversion harness would be that you could cut that and not the stock wiring harness. But I could be wrong, anyone confirm?

As for which wiring harness to use, I want to know also.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cornhusker &raquo;</TD></TR><TR><TD CLASS="quote">another question, which wiring harness would i use for this swap? the y8 harness or the dx harness? if i have the option, which is easier?</TD></TR></TABLE>

With a DPFI car, you have no choice, you MUST reuse the DPFI engine harness and rewire it to MPFI. The Y8 harness will definitely not work, even the MPFI 88-91 Si or HF harness won't. The DPFI cars have their own chassis harness plugs at the shock towers that only matches to a DPFI engine harness. You will need to reuse the stock harness and rewire it to MPFI and add any other necessary wiring as well.

 

What is the difference in engine mounts between the 89-91 EFs and 92-00 Civics?

I saw the front mount is totally different....so to swap in say a 92-00 d16 you just have to use the original EF tranny?

If this is true I wish I had known this before. I had a low milage d16y5 just sitting around that I could have dropped inplace of my tired d16a6.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HXMan &raquo;</TD></TR><TR><TD CLASS="quote">What is the difference in engine mounts between the 89-91 EFs and 92-00 Civics?</TD></TR></TABLE>

If you swap in any 92-00 D series motor into an EF Civic/CRX chassis, you simply reuse the driver's side mount bracket and mount from the EF motor. Then you'll use the cable tranny with EF tranny upper, rear and front mount. It's really easy.

 

Damn, it sucks to hear that now. I couldn't GIVE my old d16y5 away about a year ago so I took it apart and recycled it.

My A6 is pretty beat...rear main seal leaks, burns oil...I really could use a fresh engine.

Guess I will keep my eyes peeled this summer for an engine.

I am thinking get my hands on a low milage d16 short block, and throw my A6 head on there, after getting it fixed if needed.

 

I have 2 EF's both with D16Y7's. My daily beater which is an 89 DX hatch has a 99 Y7 with MPFI swap and then my new winter beater a 1990 4WD wagon which I installed a 00 Y7. It was already MPFI so it was almost a direct swap, just had an issue with the oil pan because of the 4WD transfer case. The motors are plentiful and cheap, they don't run that bad either.

 

warning: my opinion

if your gonna do all this work why not just save for a bseries motor sohc vtec is not much to brag about

 

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

if your gonna do all this work why not just save for a bseries motor sohc vtec is not much to brag about</TD></TR></TABLE>

Neither is a first gen B16A, just my opinion

 

The only reason I would put a different d series in my 90 Si is because its cheap, and easy.

Its my beater, I don't want it to be fast.

 

yup, its my beater too. and the y8 would be a whole lot better that the d15. and the best part, the motor might be dayam near free ninety free.

 

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

With a DPFI car, you have no choice, you MUST reuse the DPFI engine harness and rewire it to MPFI.

You will need to reuse the stock harness and rewire it to MPFI and add any other necessary wiring as well.</TD></TR></TABLE>

dpfi -&gt; mpfi, here i come. parts clarification (from here) mpfi manifold -&gt; y8, mpfi dizzy -&gt; y8, resistor box -&gt; not needed, injectors -&gt; y8, ecu -&gt; p28 with obd0-&gt;obd1 conversion. is this all correct? also, aside from vtec, what other wiring will i have to add to get the y8 running? last, will i have to repin or splice/solder any connectors, or are they plug and play? thanks for all your help.

 

okay, so to re-cap...

engine mounts
- stock crx mounts

transmission
- crx transmission

wiring
- dpfi-&gt;mpfi (obd1 - injectors, tps, 4-wire o2, distributor, anything else?)
- link1,link2,link3,link4,link5


*edit*
is this the correct wiring for converting to a 4-wire o2 sensor?
WHT wire -&gt; D14 which is o2 sensor input (shielded wire with ground)
BLK wire -&gt; A6 which is heater control
GRN wire -&gt; D22 which is sensor ground
BLK wire -&gt; B1 or A25 which is sensor voltage

what wiring needs to be done for the distributor? i spent the last hour or so searching and havent found anything. i guess i am confused because it is an obd2 dizzy going into an obd0 car and on the ecu end i am using an obd0-obd1 conversion harness. ugh, maybe i am thinking to hard on this one, hurting my head.


Modified by cornhusker at 11:26 PM 1/13/2004


Modified by cornhusker at 11:35 PM 1/13/2004