starbuck478
Active Member
so i just bought this superchips cortex 1950 programer for my 03 xlt 5.4L and i was wondering if any of you have the same set up in your rig and if so have you tried adjusting the shift points and shift firmness levels? i do plan on running the performance tune when i refuel with 91+ octane but my rig is a daily driver so i won't be doing that too often and want to set my stock w/ options tune with the best combo for performance. off the bat i set the shift firmness at +20 psi and the shift points at +100 rpm for all shifts. any input is greatly appriciated