Hey, I scored up a HKS PFC Fcon for a S5 for cheap but i have a S4. ( i didnt know it was for a S5 at the time ) i have a 87T2 with a S4 block and running S5 manifolds but a S4 TB. Now I would really like to run this Piggy back comp as it cost me approx $120 US ($200 NZ ) but i dont think it will go so well running on a S4 loom due to the diff in resistance for the injectors. I can swap for free to a S5 loom and Comp and i'll run my S5 TB i have but i dont know how it will go with all my other S4 sensors etc. I have all emissions removed except BAC ( kinda not emissions tho is it )

Will it work on my S4 loom? and is it worth it to swap over to the S5 set up/ will it work?

 

The F-CON adapter harness is year specific.
So it'll only work with an S5 wiring harness.
To make the F-CON plug correctly, you'll need an S5 engine harness, period.


-Ted