Tuned an 04.5 automatic truck today. Dual CP3, FASS 150 with sump, 100hp injectors, BW S366. Had a smarty SSR that I had tuned, stacked with edge when the truck was stock ish. Just got these parts installed (turbo, injectors, and cp3) , and I talked him into a real tune.
With both the smarty, and the tune I made, when I turned on the edge, the rail pressure surges to the point where the truck almost bucks at part throttle coming into boost. I was seeing swings of about 7k psi on the rail pressure (jumping from 13k-20k). Just my tune, or just the smarty, no surge. Rail pressure keeps up excellent, and does not hunt or drop when the edge is put down to "0". Put the edge on any of its stages 1-5 the fuel pressure goes crazy.
Only thing I can think of is to start digging into the PID loop of the FPR and try to dumb it down, because it seems like an over-correction hunt, but that seems drastic to me.
I personally have the edge stacked on my early 04 truck and it works flawlessly. Has anyone seen anything like this? Any ideas?