Hey guys, how's it goin

- Here's the break down, the y7 blew and this most likely gives me the chance to swap in a y8. Since I'm really on a budget, literally, and that can be a little nice upgrade for daily driving.

Anyways, here are my questions -

When swapping in the y8, I can still use the DX tranny right? Can I use mostly everything from what I had onto the y8?

Why I'm asking is simply because I want to know more info and gather the things I need before jumping the gun on something I don't know about.

- Thanks.

 

Up for answers.

 

ttt

 

yes that D series trans will bolt up to the Y8, I think you may have to mess with the ecu due to the non vtec to vtec.

Im sure someone will enlighten you a lil more on that though.

 

Thanks for that input, anyone else?

 

 

you would need to run a EX ecu

 

Your gonna need the d16y8 (P2P) ecu along with the D16y8 (Civic EX) wiring harness in order to have no CEL's and vtec to work

 

Like stated above, you will need an EX ECU . what year is the y8 motor? Only reason im asking is because 96-98 is OBD2a and 99-00 is OBD2b. If the motor is older than 98 you will need a jumper harness. (thats only if youre getting the ECU with the motor)

No you will not need an EX wiring harness.
You only have to add wires for Vtec.
whos going to change the whole harness for that swap?

and yes the DX transmission will work.
Is the car auto or manual?
i believe the gears are longer on the DX transmission in a 5speed but the same between EX and DX with an auto.

 

The year of the y8 motor, I don't know yet simply because I haven't purchased one yet. I'm still trying to find one, I thought everyone had them laying around everywhere for sale, guess not.

And my car is manual.

So I'll need the following -

EX ECU
Jumper Harness if older then 98 [No JHarness if newer then 98?]

 

You can Skim through the marketplace for a y8
or craigslist.
The only reason you will need a jumper harness is if the Motor you find is out of a 99-00 and youre getting an ECU with the motor.
If no ECU comes with the motor you can simply buy an EX ECU for 96-98

 

Yea, I've been looking through the Marketplace and Craigslist thoroughly. Nothing has came up so far, I've spread the word for friends to help as well.

Thanks for your guys' inputs, especially ifIexplode.

 

ya good swap. u need the y8 ecu to tho. if i were u i would do a z6 but y8 is alright too

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lasty K &raquo;</TD></TR><TR><TD CLASS="quote">The year of the y8 motor, I don't know yet simply because I haven't purchased one yet. I'm still trying to find one, I thought everyone had them laying around everywhere for sale, guess not.

And my car is manual.

So I'll need the following -

EX ECU
Jumper Harness if older then 98 [No JHarness if newer then 98?]

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

You need the P2P ECU either way, regardless of the year ('96-'00)

You DO NOT NEED a jumper harness.

A '96-'98 P2P ECU is the same as a '99-'00 ECU with the exception of the plugs on the back - the fuel trim and ignition tables are exactly the same.

Just get yourself a '96-'98 P2P ECU and it'll plug right in. Get a '99/'00 and you'll have to spend 100+ bux on the conversion harness. Since they're exactly the same except for the plugs, I'd go with the '96-'98.

Also, the dizzy plug is diff from a '96-'98 to a '99/00 - so you'll either have to use a '96-'98 dizzy or if your motor is a 99/00 chop the plug end off the dizzy and crimp/solder on one from a '96-'98.

I'm not sure if there's a difference in the injectors plugs too.

Basically: Get all your parts from a '96-'98 and it'll save you from having to dick with conversion harnesses and solder on different plugs 'n such.

Also, I personally wouldn't buy a '96-'98 EX wiring harness, but if that's what you wanna do, go for it. I personally would just wire in VTEC, it's one wire for the solenoid + 1 wire for the oil pressure check.

A4 and D6 on an OBD-I ECU, dunno offhand what the connection #'s are for a OBD-II. Just wire up VTEC, it's two wires, if you swap harnesses you'll have to swap BOTH harnesses b/c you'll need the engine harness to go from the oil pressure and VTEC solenoid to the strut tower, then you'll need the entire dash harness to get the plug that comes from there that goes to the ECU (I'm pretty sure).

Unless they made the same dash harness for EX/DX's, I think you'll need a new dash harness too.

It's not worth it, wire up the TWO wires for VTEC independently of the harness and just wrap them in heat-shrink wrap or something of the sort and zip-tie them to a main engine harness lead.

 

Jumper harness/conversion harness.
same thing Syndacrap

 

I found a y8 someone is selling finally. I just need a P28 and a jumper harness is all.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ifIexplode &raquo;</TD></TR><TR><TD CLASS="quote">Jumper harness/conversion harness.
same thing Syndacrap</TD></TR></TABLE>

Call it what you want - you don't need one if it's a '96-'98.

 

Ummm I am having a similar issue here - I put a 97 civic ex y8 engine and transmission from a coupe into an lx 4door. Now I have seen so many wiring threads but am uncertain what to do. I have both entire cars but the wirings are different as well as the exhaust which I will address later.

My q: to make the engine run correctly I need the P2P ecu from the EX from what I understand, but if I use the EX engine harness there are two main problems I see both connected to the cabin harness 1.) the LX cabin harness has an ECU connector but the EX engine harness already has all the ECU connectors on it! 2.) There's an extra EX engine harness connector (c136-8pin,4wire, white/red - interlock sys, white, blue, green/black - A/T controls) looking for a cabin harness connector (c305) which isnt present on the LX cabin harness.
So do I use the LX harness and change every plug thats different and manually wire the vTech and second 02 when I install it? Will I have to change the ecu pinouts to make my LX harnesses communicate correctly with the EX EcU?? Or is there a workaround so that I can use the 97 coupe EX engine, harness and EcU in my 98 sedan LX body??
Thanks in advance!

 

Are both cars manual or auto?

 

BOth auto

 

Automatic ecu needs 4 plugs

 

yah im way passed that question. Both ecu had all pins, but the ecu connectors are all on the EX coupe engine harness whereas the LX sedan cabin harness has one ecu connector on it and the other three on it's engine harness.... so what are the wiring solutions? From the other side of the Ex harness going into the cabin there is a plug missing (c305 on the ex body)

 

confirm that the green plug has additional wires not going anywhere.

have you started the car with the way it is?

 

Im not sure what you mean. The green plugs both have their respective connectors present tho they may be wired differently... and I assume that is the cabin wiring on both

 

The engine harness has a green plug as well.