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Old 09 Nov 2007, 08:16 am
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Default wiring help?

ok i just got an obd1 94 acura integra gsr (b18c1) and i was planning on pulling the motor and swapping it in a obd2 97 acura integra rs (b18b1). now the question is how should i wire it up? should i use my factory harness and use a jumper for the ecu, or will the obd1 engine harness hook into the obd2 shock tower connector? any help is appreciated thanks
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Old 09 Nov 2007, 08:31 am
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It is always the smartest move to use factory stuff. If it will fit.I hope you have schematics for both to make sure the wires in the connectors go to the same place.If you have to use a jumper refer to your schematic and make sure you wire it correctly.
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Old 09 Nov 2007, 08:46 am
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What you need is the B18C wiring harness. The RS motor doesn't have VTEC and without the harness from the B18C it will never engage. Your best bet is to convert the motor to OBD2. This is done by putting the OBD2 oil pump, crank position sensor, throttle position sensor and distributor on the OBD1 motor. This way you can get a OBD2 wiring harness and plug it into the motor, pull the B18A out, unplug the B18A wiring harness from the main fuse box, drop the B18C in, plug the harness from the OBD2 motor into the main fuse box, and your done. Remember you need the GSR shift linkage, the GSR axles, The GSR motor/tranny mounts, and the GSR ECU. The harness is kind of expensive, but believe me if you take the RS harness somewhere to get it re-wired to accept the B18C motor you will have spent just as much as opposed to getting the harness. Another bonus is that you know its NEW, and there is no chance for any electrical problems later. If a wire comes loose it could cause erratic driving, your car might not start, or even worse cause a fire. Apparantly the guy under me has no sense and has never done this swap. YOU HAVE TO CHANGE THE AXLES, SHIFT LLINKAGES, AND MOTOR/TRANNY MOUNTS.
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Old 09 Nov 2007, 09:16 am
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You can do it either way, they both plug into your shock tower plugs. The differences you need to watch out for are the injectors, alternator, & distributor plug(s). Use the injectors that match the engine harness you use, otherwise you'll need to rewire them in reverse (positive to negative, negative to positive). For the alternator, just use the one to match the engine harness. For the distributor, the OBD1 one has 2 plugs, where the OBD2A has 1 plug. You will also need thean OBD2A to OBD1 conversion harness to use the OBD1 B18C1 ecu. Adding wires to the OBD2 harness isn't a big deal at all, it's simply running a few wires from the connectors (don't forget about wiring the IAB) to the correct pins on the ecu. Here's a link to the ecu pinouts: Scroll down to the "ECU & Wiring Tech" section, pick the OBD, and check out those links.And don't listen to the guy who said to change mounts, axles, & the shiftlinkage; the ones from the RS will work fine.Also something no one else mentioned is the possible legal issues with that swap. Check with your local (State) laws about emissions testing & swapping in an older engine. Some states will only let you swap in an engine that is the same age as the car or newer. And if your state does emissions testing, the OBD1 ECU is going to make you fail instantly.
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