Ok i have been helping my friend build up his 87 TII. We have a full race beat exhaust, stage 3 stock turbo upgrade, fmic, koyo rad, boost set at 12psi, ect.... Ok we installed 4 800cc injectors and bought a new super afc to tune it. We went with the same 800cc for the primary and the secondaries cuz i figured it would run better throught the 3800rpm crossover point. We also installed a aem wideband 02 to make it easier! I have read that in a s4 you should set the throttle settings at 97/99 or 98/99. As for all the other settings i have no clue what is best! I got it tuned to run and drive but id pegs rich as hell in the midrange makin the turbo spool slow cuz it falls on its face rich! Can anyone please give me a idea for some good base settings for our set up? Thanks for any help!

 

You should consider using the pressure signal in place of the TPS on the S4.
Thay way you get a smooth shift to the high map only as the boost pushes up.
You also get automatic compensation to cold vs. warm air conditions using the pressure signal.

There are some other threads in the forum that discuss this.