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1989 RS 2.8l V6 to 5.7l V8 TBI swap ECU/ECM question

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1989 RS 2.8l V6 to 5.7l V8 TBI swap ECU/ECM question

Old 04-16-2019, 04:20 PM
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1989 RS 2.8l V6 to 5.7l V8 TBI swap ECU/ECM question

If this queation has been asnwered please direct me to the post.
Situation: I'm wanting to install a 5.7l TBI from 1991 C1500 truck into a 1989 Camaro RS (Originally 2.8l, bought without engine)
Question #1: Can I still reuse the original harness in the RS? I understand I will probley have to re-pin some things, but is it possible? If not then What a the best harness to search for?

Question #2: What ECU/ECM can I use for the 5.7l set up? Could I reuse the trucks original ECU 1227747 in the RS? Or is there a better option out there?

If anything is unclear let me know, thanks for the help In advance!
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Old 04-16-2019, 06:15 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1989 RS 2.8l V6 to 5.7l V8 TBI swap ECU/ECM question

You might want to get a 89-92 tbi harness.
the 747 will replace the 746.
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Old 04-16-2019, 06:16 PM
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Re: 1989 RS 2.8l V6 to 5.7l V8 TBI swap ECU/ECM question

Are you changing the transmission too? The 2.8L trans isn't going to bolt to the back of a 5.7L.
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Old 04-16-2019, 11:06 PM
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Re: 1989 RS 2.8l V6 to 5.7l V8 TBI swap ECU/ECM question

Tuned performance, so you saying get a harness from another camaro that runs TBI in it and use the 747 ECU from the 91 truck?? Sorry need some clarification on that one....
As far as the tranny goes, I was planning on using the RS tranny. But I haven't looked into if it would bolt on or not.
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Old 04-17-2019, 10:31 AM
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Re: 1989 RS 2.8l V6 to 5.7l V8 TBI swap ECU/ECM question

It has a 60 degree bolt pattern on it. you will have to source a 700r4 with a 90 degree pattern. the v6 700r4s typically have less clutches in the 3/4 clutch stackup.
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Old 04-17-2019, 10:55 AM
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Re: 1989 RS 2.8l V6 to 5.7l V8 TBI swap ECU/ECM question

Originally Posted by Abraham Mendez View Post
Tuned performance, so you saying get a harness from another camaro that runs TBI in it and use the 747 ECU from the 91 truck?? Sorry need some clarification on that one....
As far as the tranny goes, I was planning on using the RS tranny. But I haven't looked into if it would bolt on or not.
correct a harness from a tbi camaro and use the 747 ecm.
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