redcrxsi

alright heres the thing.. I'm going to put a B18a into my crx, have wanted to for awhile... got everything you really need for it, my only question is can I use my stock 91 si wiring harness for it, and a pm6 with a pr3 map from turboedit? or with I need the stock ls harness obd-0, and a pr4 ecu, which would you guys recommend??

Geoff

beater

Stock harness will work. You don't need PR3 maps unless you are running a vtec head. You can run a PM6 with PR4 maps and you will run like a champ.

-Nick

redcrxsi

yeah i know that a pr3 is a vtec ecu, sorry about the type-o, so a stock si harness will work and the ecu if rechip with do fine..cool thanks for the input but I can use a pr4 acura ls ecu..it will hook up to the harness right??

geoff

88dx

a 90-92 LS PR4 will plug right in to your car, anything newer is OBD-1 and wont directly plug into your car.

redcrxsi

it would be a lot easier to go vtec like I planned, with obd1. I don't want to go through the hassle with wiring it up I just want a plug/play type deal, plus I have seen some pretty quick LS Turbos, and just b18's in general

91civicZ6

everything will plug right up. B18A1's have some sort of plug on the back of the block which i have no idea what it does, so be aware you will have a plug thats not hooked to anything.

If memory serves me correctly, it is a green, 2 prong plug. There are the single banana plug type oil pressure switch and dual banana plug fan switch, and then the extra plug.

I ran my LS swap for months on a PR4 ECU with that plug not plugged in with my factory DX-to-Si converted harness and it never faltered or ran bad. it must not be that important.

does anybody happen to know what the plug is though?

88crxSi

90-91 = obd-0
92-93 = obd-1

turboguy84

yeah, it's called a knock sensor, and LS motors usually don't have them

91civicZ6

uh, no. Its not a knock sensor. every B18A i've seen has this same plug.

yellowcrx6

i never used that plug either. not sure what it was, and i wasnt to concerned either