So I have a 89 si hatchback that i am swapping my b18a1 motor in. Since it is multi port i dont have to wire that in but i have a few questions on the harness. Should i use the 89 si wiring harness and just swap the distributor plugs? If i go that route i will be depinning and repinning the ecu with the info from : https://honda-tech.com/forums/showth...d0+obd1+wiring

But what im confused on it about the o2 sensor, on the d16 si motor it is threaded in on the headers where it goes from 4 down to 2, but on my b18a1 it i after it goes down to 1 pipe. Should i just extent the wires on it to reach there? Or is there a way to use the b18 harness and just swap the plugs to connect it in the engine bay? Any info would be nice. thanks.

 

Use the 89 Si harness and repin the plugs. Absolutely the best, hands down, method.

Extend the wires to reach. I'm not sure which B18 motor you have. You should be able to just extend the wires and connect the O2 sensor.

 

so only the ecu and distributor plugs will need repinning right? and the b18 i am using is a b18a1 out of my 93 integra.

 

Cool got most of it wired in just stuck now on 2 plugs from my B18a1 which is what im putting on my 89 si hatch. There arent any plugs on the 89si harness where these are so im not sure what should be done really.

From the b18a1




And from the intake off the d16 si


any ideas? ive made a few posts in the last few days but no replies and cant find any forum threads on a similiar swap that goes over these any :/

 

Anyone?

 

First one is the fan switch, your Si's is in the back of the block so you can wire it from there to this location. The second one is EGR, ignore it. Third is not needed eliminate it.

 

Sweet the si fan switch is the one that is sort of souldered on the back of the block... So then on the back of the b18a1 block what is the two prong plug there?
Thanks for the info

 

The fan switch is the one on the right with two brass prongs

 

ok so the one on the right is the fan switch on the si harness so that would go to the green plug on the back of the b18 block right?

 

What connectors do you have on your block?

 

i have a single bin connector (just left of the oul filter) and a 2 prong green plug similar to the photo

 

https://honda-tech.com/forums/acura-integra-6/b18a1-what-back-block-3209654/
has a pic of my back of my block, cant find the original pic to repost it here