89 engine/tranny/ECU into 87

rays87turbo · 11-22-2005, 04:12 AM

The 89 ECU is a beast of its own. Its not totally compatible with the pre 89 or the post 89. If you swap the 89 body harness into the 87, you can use the 89 ecu, and engine harness. I would reccomend just using the 87 engine harness and ecu. I believe the only differences are some of the sensors on the thermostat housing. Also the HAC sensor is in the ECU on the 89+ whereas its mounted under the glove box on the pre 89. Beyond that the 89 ECU is no more advanced or with better fuel maps or anything. You shouldn't notice a performance decrease or any thing else like that from using the 87 ecu.
Also note that the pre 89 front cross member is different, so are the motor mounts. If you are putting the 89 motor in an 87 you will need to use the 87 motor mounts.

DevinWolfe · 11-23-2005, 02:54 AM

I have heard that the injector plugs/harnesses are different as well on the 89 but i dont know how i would use the 87 harness on the 89 motor if this was the case. I am pretty sure that swapping the body harness would be very difficult as i have been into the dash only deep enough to swap to the 89 guages.

rays87turbo · 11-23-2005, 04:42 AM

You could use the harness and injectors from the 87. You could rewire the 87 harness with the 89 connectors and use the 89 injectors. Swapping the injectors would be the easiest way. 87 or 89 they're both 440cc injectors, as long as they work it doesn't matter which ones you use.

11-22-2005, 04:12 AM	#1
rays87turbo Stock Join Date: Nov 2005 Posts: 17	The 89 ECU is a beast of its own. Its not totally compatible with the pre 89 or the post 89. If you swap the 89 body harness into the 87, you can use the 89 ecu, and engine harness. I would reccomend just using the 87 engine harness and ecu. I believe the only differences are some of the sensors on the thermostat housing. Also the HAC sensor is in the ECU on the 89+ whereas its mounted under the glove box on the pre 89. Beyond that the 89 ECU is no more advanced or with better fuel maps or anything. You shouldn't notice a performance decrease or any thing else like that from using the 87 ecu. Also note that the pre 89 front cross member is different, so are the motor mounts. If you are putting the 89 motor in an 87 you will need to use the 87 motor mounts.

11-23-2005, 02:54 AM	#2
DevinWolfe Stock Join Date: Oct 2005 Location: East TN Posts: 8	I have heard that the injector plugs/harnesses are different as well on the 89 but i dont know how i would use the 87 harness on the 89 motor if this was the case. I am pretty sure that swapping the body harness would be very difficult as i have been into the dash only deep enough to swap to the 89 guages.

11-23-2005, 04:42 AM	#3
rays87turbo Stock Join Date: Nov 2005 Posts: 17	You could use the harness and injectors from the 87. You could rewire the 87 harness with the 89 connectors and use the 89 injectors. Swapping the injectors would be the easiest way. 87 or 89 they're both 440cc injectors, as long as they work it doesn't matter which ones you use.