What is needed for SOHC VTEC Swap...

I was going to do a B16 or B18 but I don't really feel like dealing with all the mounts, linkage, axels and all that crap. So now I rather just stay D-series. Which the most powerful USDM ones would be the D16Y8 and D16Z6 I think? I really would only need the engine and everything attached to it right? I can still use my tranny? And out of the Y8 and Z6 which one is better?

Use the Y8...it is newer. You also need to convert to either OBD1 or OBD0.

Y8 is a little better due to higher compression and better designed intake manifold. To do the swap you should use your tranny, newer engine, your ecu, distributor, im not sure about plug wires, your axles, and somehow hook up vtec either via and rpm activator or zdyne product. The swap seems so straight forward, I will be starting on mine after I grab my engine on the 20th of oct.

Is there any tutorials about how to do all the wiring exactly?

Originally posted by Bleebdat
Y8 is a little better due to higher compression and better designed intake manifold. To do the swap you should use your tranny, newer engine, your ecu, distributor, im not sure about plug wires, your axles, and somehow hook up vtec either via and rpm activator or zdyne product. The swap seems so straight forward, I will be starting on mine after I grab my engine on the 20th of oct.

sorry Bleebdat..i have to correct you a little. you only use your parts if you have a SI..if you have a DX you will need d16a6 (si) parts. you can use a dx tranny but, if you have an extra $1-200 it is very worth it to get a better geared Si tranny.

there are 2 ways.

-use a6 ecu, distro, and rpm activated switch
-use z6/y8 parts and p28 (92-95 Si/EX) ECU. you can rewire 50 wire (i hope you have patience) or get a wire conversion harness for $150

the p28 route is much better. you can lose a couple of ponies going with the 88-91 Si ecu. i also hear you lose a little gas mileage (but i doubt much). the p28 ecu will engage vtec, no rpm switch needed. another i noticed is that with the p28 your check engine light flashes the error code rather than pulling up your carpet to read the ecu.

http://www.geocities.com/bing_bong916/vtec.html

http://hybrid2.honda-perf.org/tech/sohcvtec.html

http://www.geocities.com/kurtsi_on/page7.html

http://www.geocities.com/crx288/d16z6swap.html

http://www.angelfire.com/ca/DrOhm/hybrid.html

http://integra.vtec.net/engine/vcontrol.html

this post is exactly why i have been asking people for informational and engine source links in that other post (http://www.automotiveforums.com/vbulletin/t66163.html) wouldn't it be great to have all the engine/swap info at the site? :D

Originally posted by LadyNRedSi



this post is exactly why i have been asking people for informational and engine source links in that other post (http://www.automotiveforums.com/vbulletin/t66163.html) wouldn't it be great to have all the engine/swap info at the site? :D


genious.. purely genious

Ami, you are right about the dx part, I was assuming Si =].

I had the patience and resoldered all 50 or so wires, i would rather have done the wire harness route if i had a chance to do it again.


gunnmen01

Originally posted by Bleebdat
Ami, you are right about the dx part, I was assuming Si =].

in a perfect world...Si would be the (usdm) base model ;)

Yo, I don't remember where I read it, but I know I did.... isn't there an issue with the DX throttle cable being too long also? If so, the required one would be an Si throttle cable?
Anyone know where to get a DX - D16Z6/Y8 conversion wiring harness at?

thedropshop.tv, or go to Amis page and check the links section.

the guy who did my install did it for 20 bucks and a 12 pack.....lol...i dropped the engine, he did all the electrical shit, he is also is a good friend...so thats why it was so cheap, all it all my total cost was 600 plus the price of a d16a6 dizzy

Originally posted by gunnmen01
thedropshop.tv, or go to Amis page and check the links section.

dropshop or you can e-mail jason ([email protected]) he did mine and a couple of other people's. either place is going to be $150

oh, so by wiring harness you mean instead of having the wires resoddered, putting together two connecting ends with which to plug the DX and the sohc vtec ECU together?

isn't there an issue with the DX throttle cable being too long also? If so, the required one would be an Si throttle cable?


You can use the throttle cable of off any 4th gen model that has multi point fuel injection stock. I used the cable off of a CRX HF and it works fine.

One thing also when you do the swap you'll notice that some of the hoses and wires wont have the same mounting brackets so you might have to fabricate them.

One other thing, if you're not using the p28 ECU, you have to use a distributor from a car that came stock with multi point because those have the cylinder position censor inside and the DX distributor does not.

yo, 91civicDXdude we should meet up next time im up in kc, thats like a 45 min drive from where you are.....i wanna race! hhehe we have the same engine so it would be a pretty close race, it would prolly depend soley on the driver

Originally posted by Killa_CRX
oh, so by wiring harness you mean instead of having the wires resoddered, putting together two connecting ends with which to plug the DX and the sohc vtec ECU together?

yes, one end goes to your dx harness and the other end into the p28 ecu.

the pics are too big...so here are 2 thumbnail pics
http://www.4thgenerationcivic.com/Staff/LadynredSi/pics/wiring_harness_001_small.jpg

http://www.4thgenerationcivic.com/Staff/LadynredSi/pics/wiring_harness_003_small.jpg

you can find the full size at my swap page (http://www.4thgenerationcivic.com/Staff/LadynredSi/SOHC%20v-tec.htm)

on the big pics you will see 8 wires wrapped in tape. those are the 8 wires to be extended...the rest is plug n' play. as you can see, much easier than 50 wires.

the 8 wires go to:
(4) go to 4 wire o2 sensor
(1) to knock sensor
(1) to vtec solenoid
(1) to check engine light
(1) ? dang it i forgot

:( i can't remember the last one off the top of my head...maybe gunnmen does :confused:

ami

(4) go to 4 wire o2 sensor
+
(1) to knock sensor
+
(1) to vtec solenoid
+
(1) to check engine light
+
(1) ? dang it i forgot
________________
8 wires :p although is dang it i forgot a tech term?

Originally posted by LadyNRedSi

on the big pics you will see 8 wires wrapped in tape. those are the 8 wires to be extended...the rest is plug n' play. as you can see, much easier than 50 wires.

the 8 wires go to:
(4) go to 4 wire o2 sensor
(1) to knock sensor
(1) to vtec solenoid
(1) to check engine light
(1) ? dang it i forgot

:( i can't remember the last one off the top of my head...maybe gunnmen does :confused:

ami

Ok, so the 8 wires are extra wires from the p28 ecu that the DX harness wouldn't normally have, right? Just need to be extended from the wiring harness to thier proper places?
Wiring harness looks most worth the money now looking at it! Wouldn't want to try that myself :)
But that doesn't take care of the fact that the DX has dual point fuel injection does it? Would I still have to add anything for that, or does using the p28 ecu take care of that lil' problem?

Sorry so many questions, but I think I am going to try and do this swap on my own, so I'm trying to get everything pretty exact, as far as what I know and cannot understand from all the "how to do" websites you've provided.

And I'm still unsure about the DX throttle cable... cause I know I read somewhere (can no longer remember nor find where) that the DX has an abnormally long throttle cable, and one from an Si or HF has to be used... is this true, or does anyone know for sure?

I dont remember the 8th wire either, i have only talked to Ami about it, never seen one.The p28 ecu will run everything else with that adapter from Jon.As for the dx throttle cable you can use it, i used mine, just takes a little creative looping to get it to lay right.


gunnmen01

You can use the throttle cable of off any 4th gen model that has multi point fuel injection stock. I used the cable off of a CRX HF and it works fine.


already been answered bro

yo, 91civicDXdude we should meet up next time im up in kc, thats like a 45 min drive from where you are.....i wanna race! hhehe we have the same engine so it would be a pretty close race, it would prolly depend soley on the driver



yeah i go to KC on a regular basis. are you still using the DX tranny? we just might have to do that heh:frog:

Originally posted by 91civicDXdude


already been answered bro

Due to what I said I've read, I didn't find your answer informative enough. :(

But I understand now, thanks to gunnmen01. :D

nah, im using the a6 tranny, u still on a dx?

P28 ECUs don't require a knock sensor. Only 92+ B-series VTEC,98+ CRV,and 96+ EX (possibly HX) ECUs do.
Also,if you do use the fuel injectors off that newer engine,you will need to bypass the fuel injector resistor on Si models.
Your firewall will also be free of that MAP sensor and EVAP purge solenoid (one near the throttle body)

http://home.att.net/~edhybridog/dirty01.jpg
Z6 block/Y8 head.Pardon the mess,it hasn't been driven over 4 years now


http://home.att.net/~edhybridog/dirty03.jpg
where the injector resistor box used to sit

slammed....

yeah im still using the DX tranny.. sucks for accelerating man. when you hit 4th or 5th gear its like hitting a wall. it just dont accelerate any faster than that. i have to hope i can pick up enough speed by shifting at like 7100 rpm :bloated:

I like the DX Tranny. It doesn't accelerated as fast but when you are on the highway and after you hit 70 it rolls damn well.

Since my Si Tranny got fucked up, i'm on a Hybrid Tranny :) its a ZC tranny and a Si final Drive :) I got all brand new gears also :) I love this baby! Its so sweet :) Plus, i only got it for 200 bucks cause there is a guy who had a ZC in his CRX, but put in a b20...... and he sold the ZC, but the tranny was sittin in his garage for a month, so i got it off his hands :) YAY!