1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

S3 to S4 ECU and Wiring. Info?

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Old 01-24-16, 12:43 AM
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S3 to S4 ECU and Wiring. Info?

I thought there was a thread on this, but has anyone done this successfully?
I would like to use the bigger AFM and a second set of injectors with some tunability (RTEK)
Car is 85 GSL-SE. Engine is a ported S5 with Turbo housings, S4 intake, and all S3 electronics. Including injectors. I know I could get more potential out of this engine with the S4 ECU and wiring along with an RTEK.
Just would like to know if it has been done and if so HOW??
Old 01-24-16, 10:18 AM
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Give me a minute...
Old 01-24-16, 10:21 AM
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How To Wire an ECU in FB

Austin's FB TII Swap
Old 01-24-16, 09:26 PM
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Originally Posted by DreamInRotary
Great! Thanks alot!
Old 01-26-16, 03:52 PM
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Will this work for SE to S4 NA?
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