So this is going to be my first ever non stock swap (have done a few stock to stock swaps) but I have a few questions. Before we get to the questions here is a list of the parts I have right now
1) 91 Crx Dx (Automatic)
2) B20b with a b16 cable trans
3)Hasport B series EF motor mounts
4) I have the correct post mount and t bracket for the swap
5)A mangled up wiring harness from a 90 integra ls
6)Still need my axles, jumper harnesses if applicable, and a proper ecu.

The guide I looked at for CRX Auto to Manual's pictures are no longer loading on the thread

1) Car was automatic, already have the new pedals installed, the starter switch wire is grounded so no clutch needs to be pushed in order to turn over the motor.
The guide I looked at for the swap says the rear mount on an auto is different from a manual, since I have a manual b series hasport mount I just bolt it up and no issues here correct? it says i have to bolt them to different holes on the subframe? Cant find good pictures.
2) I have not done the DPFI to MPFI conversion yet, can I just use some of this 90 integra harness to achieve that?
3) When reading about how to swap it said that my obd's have to match, I'm confused as to why this matters as long as I have everything jumper harnessed to the correct thing and whatever extra sensors wired up to make the ECU happy.


First question is really my priority because I want the motor sitting inside of the engine bay ASAP, dont plan on having it running for another month or so because I know my fuel pump is out and I have to mess with the wiring which I hate. Thanks in advance for helping a noob out

 

Here is a great thread with lots of info:

https://honda-tech.com/forums/honda-...-more-2769325/

To answer your first question, I believe as long as the T bracket came from a manual, you should be alright.

 

Okay so re reading that what I have gathered is when I run a p28 obd1 ECU I am going to have to have an obd 1 dizzy no matter what. And that the integra harness I have is going to be helpful in converting mine over

Also got the motor all mounted in the car today, the hasport mount connects to the 2 farther right (when looking at the front of the car) holes. Anyone have a good picture of how I wire up the 2 reverse light wires from the tranny to the car?

 

You don't necessarily have to run an obd1 distributor. I run an obd2 dizzy in my swap (which is obd1 p28 based) since I already happened to own one, then made an adaptor to my existing obd0 plugs. Needs to be the "large" plug or you won't have the tach output.

 

What injectors are you going to be running? If you want to use that 90 integra wiring for the injectors you will need to make sure you have obd0 injectors. If you run obd0 injectors you will need to wire in a resistor box tho. You can run obd0 injectors with an obd1 ecu the afrs just won't be 100% on the money.

 

the b20 in the car right now currently has an obd2a dizzy, so can I just convert the plug on the dizzy to obd1 and then jump the car from obd0 to obd1 is what it sounds like youre saying I can do? This is why im confused because the post for the b swap said i HAVE TO run obd matching ecu and dizzy

 

It currently has obd2a injectors on the b20b, and then eventually once I rebuild the h22a its going to be an h2b swap with a turbo in the future which is a whole other clusterfuckery of what I will need to be running. While doing some more google searches I found a much better guide for the dpfi to mpfi conversion with extra pictures so i will read into this a bit more and come back with any complications/questions DX,STD (DPFI) -> Si,HX (MPFI) wiring only thing is can I use the integra harness instead of an a si harness?

 

For the sake of just doing a dpfi to mpfi conversion it wouldn't matter if you used the injector clips/wires from your 90 integra harness or an si harness. Both of them run obd0 injectors so the clips are the same. If you want to run those obd2 injectors, you'll need obd2 injector clips/wires.

 

ive tried to look online but i cant find a difference in obd0 and obd1 injector clips. all i keep finding is "the only difference is obd0 needs a resistor box" are they the same clip i just need to wire/unwire a resistor box depending n what i have?

edit: dug a little deeper and found a slight difference in the injectors so there should be a difference in the clips! will have to swap clips or find jumpers depending on what i use

 

If you're dropping the B20B in complete, you shouldn't have any problem making an adapter for the distributor it came with. If you were for example changing the cylinder head to like a B16A then you'd have to find a different one.


Now if your b20b dizzy doesn't have the RPM lead, you will have a problem.

 

thanks for the diagram! i just checked and i have an obd2 big plug dizzy. so all i need to do now is get the plugs off an obd1 dizzy and repin the obd2 dizzy to have the 2 obd1 plugs?

 

The clips themselves are physically different between obd0 and obd1 injectors. Since you are already adding in the injector clips, it would look better and be a good idea to start off with the proper injector clips instead of soldering the injector clips on and then also having to buy jumpers.

 

If your engine harness is obd1 then yes that should be all you need to do. My car is an Si and I kept my obd0 harness, so my obd2 dizzy was adapted down to the obd0 plugs with an obd1 ECU.

 

on the injector clips you can run run both the obd1 and obd0 the difference is inside the clips there a little peace of plastic that you just cut out with a razor blade and then you can connect obd0 injectors with obd1 clips

if you want pictures check out my thread on here
Marcos new work car 90 sedan
i did the swap your doing ish
so all the problems you may have
i have already solved and took care of them
check out my thread and if you have any questions ask away

 

Okay so here is where I'm at right now:

The swap is completely finished as far as hardware goes; motor trans axles shift linkage are all in.

I have the harness side of the dizzy plug for my dizzy so I can wire it up to the harness, the passenger side is nice and tucked through the fender, about to pull the driver side into the car, and I found a nice labeled obd0 dx harness so I can easily separate each strand for when I tuck the engine wiring itself. After reading a few threads I actually understand the dpfi to mpfi conversion so no more questions there, but when looking at the labeled harness I am wondering if I can delete these plugs here:
I know I can delete the 2 blue ones since my mpfi injector wiring will be separate from the rest of the harness already, but "useless sensor" doesnt sound like the accurate name of the sensor so I'd like to know what it really is and if I can delete it!

 

Also how do I wire up the reverse lights on the auto to manual swap? The guide I looked at is missing half its pictures

 

im pissed haha
i went to my build thread to see if i had something that could help you out
and this is what i found
before i removed my harness i marked every plug

but look at this

haha talk about useless
if only the tape was facing the other way

 

well the only 2 green ones are labeled iacv and injector. i know the 1 injector is 100% useless but iacv doesnt sound useless to me. but also the labeled harness i have pictured has one labeled as the eavc are they the same thing and your harness is labeled wrong or what? I'm still lost here

 

i was trying to find out what your useless sensor is
the brown and green plugs that are together are your two injectors
to the left of those is your iat
to the right of that is your iacv plug or yes its also your eavc plug
and on top of that is your tps
that useless sensor is missing in the pic
my harness was a auto harness
the only thing that comes to mind is that its cruise control

 

my car doesnt have cruise control so that is out, the only 2 green i see on the diagram is useless and injector. the iacv/eacv is a cream colored plug.

 

i mean only real way to tell is to leave it unplugged and see what happens or find a wiring diagram and figure out what they are through that