went to dyno today just to get some numbers and tune was stuck on low octane table. cant figure out what is causing it.
truck is a 6.0l with 799 heads, ported and polished, comp cam, ls9 valve springs, vortech v1 centrifcal only runing 4 psi (for now). 4l80 swap, 2200 stall torque.
truck weighs 6500 lbs and is setup for sled pulling once i get the bugs out.
tried 3 good pulls. iat were super high but dont think that is what is pulling all the timing out. looked at knock and burst nock- they are zero. best i can tell is when it entered pe mode it went to low octane table. short of coping high octane to low octane im not sure how to fix it. it is a 2 bar operating system with maf failed. (not even one installed on truck)