2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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S4 NA to S5 TII swap?

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Old 07-08-11, 05:24 PM
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Question S4 NA to S5 TII swap?

Well I'm trying to put this all together before I plunge into the project. All I can see here is electrical issue using an S4 NA harness to make it work with S5 TII engine.

I'm planning on purchasing an S5 TII engine, tranny, harness and ecu all together. What else do I need to look at to make this work? Alternator wiring is different as far as I know. Is there anything else that I missed? I have been searching for a week and can't find a real answer and I guess this is the best place to ask.

Along the purchase list will be the following:

Maf sensor
TII boost sensor
Bypass valve or BOV
TII throttle cable
Walboro fuel pump
Down pipe
Boost gauge
Drive shaft/propeller
water to air intercooler kit
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