I had a jdm d15b in my old eg and I love the motor and the swap was cake since it was already same obd etc. but i've never done an obd1 motor into an obd0 car before.

I checked out rywire's site that has the harness conversions but it only shows for 88-91 civic dx and I don't know if lx are the same process.

So could anyone tell me exactly what parts/mods I need to do to get an 0bd1 jdm d15b vtec into my '90 civic lx 4dr. thanks.

Edit: Well after a bit of searching it doesn't seem *too* much more difficult that swapping it into an eg. This is what I've come up with so far for parts list:


JDM d15b Motor
SI trans (optional but of course i'm gonna do it)
z6 or y8 Intake Mani
OBD1 Fuel Injectors
4-Wire O2 Sensor
P28 ECU

and the last this is the conversion harness which is basically what I need help with. Does the 88-91 crx/civic dx harness conversion from Rywire work for lx sedans as well?

 

it's the same as any dpfi

for swapping the 4dr

 

Ok so this seems pretty simple...the only difference from swapping it in an EF instead of EG is I need to purchase an additional conversion harness from Rywire and a 4-wire o2 sensor to plug into the harness and i'm good to go?

 

yeah you would have to send them both harness's then you would need a 4 wire o2 sensor and a p28 ecu.. you also have to reuse you drivers side mount and fuel pressure regulator..oh and you have to extend the wires for the fan switch.. you also have to swap over crank pulleys and alternators you might not have to but i did anyways

 

Why would u have to use the old fpr?

 

The return line hose fits loose on the 92+ FPRs so you have to use the 91' and older styler FPR.

 

I see , now that i remember, I cut off some hose from the eacv on the old engine and used it on the d15b fpr with new hose clamps.