It is the only tune in the unit, says "diablo tune." I use 91 shell fuel. I already pulled a 10% retard. Do you recommend a total of 20%? Seems a little too much...

U7153 on 01' f150 screw 4x4 w/ 5.4l. No spark issues and fuel delivery is fine. Still pinging at wot near shift points. Already retarded 10%, less, but still pings. I'm considering keeping the 10% and adding fuel in the 4-7K range. Maybe 1-2 values richer. Any advice? No ping with stock, but can't ...

Fuel filter is fairly recent, no issues with plugs or c.o.p.'s. I do not race the truck, just occasionally romp on it to merge. My #1 reason for the tuner install was to recalibrate for gears and tires. Q #1) What is an acceptable amount of retard? Q #2) How much can I retard before I go lower than ...

After a smog, I re-installed the tune in my 01 f150 screw 4x4 5.4l. I'm running 91 Shell and noticed pinging just before the wot shifts. I retarded 10% and still pinging, although a little less. If I go to 15%, this would be the same as the 87 recommendations. I don't want to retard so far that I ...