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Message: [QUOTE="Chatham036, post: 1380423, member: 13047"] I'm not following you on the first comment that the conflict is from the PCM and FICM having the same changes. The best you can do in the PCM is to expand your mg/stroke while spoofing the ICP to make power. While the main FICM inputs RPM, mass fuel desired, and ICP then the FICM will calculate the PW based off these values. Peak power being determined by having full ICP pressure, expanding the PW to fully deplete the injector, timing, and to have adequate air / nitrous. In my experience, the PCM tuning alone is limited in the how far you can open the pulsewidth. You have been tuning longer than I have personally. Maybe you found a way around the limitation? here is an email I just sent out to Derek at Vision. I think it helps to explain my point. [INDENT]--His original email-- "Hey man we put 350/100 8mm hybrids in our race truck from Warren. It runs fantastic, I just know we had the FICM tuning in there from the 225/100 conventional's. Do we need to have anything changed? Is there a certain point where it would be pointless to run FICM tuning on top of the PCM tuning? " --My Reply-- "I have actually found the opposite when trying to build power. The PCM has a lot of limitation in it for how wide you can open up the PW. The FICM tuner in conjunction will get around this quite well. The only thing you will encounter is if you are running a max of 2.0 ms PW (limited by the PCM tuning)… but your injectors don’t fully deplete until 2.6ms… you can use the FICM tuning to gain the extra .6 ms pw to get the most power out of the injectors that you can’t get from PCM tuning alone. Using the same logic, if your injector depletes at 2.0ms PW and your PCM tuning is set at 2.0 ms PW, you will not gain any performance from the FICM tune on the top end because their isn’t enough fuel. Even in this situation, I still recommend the Econ FICM tune because it will add a better profile to the FICM fuel maps without opening the PW on the top end. In this situation, the Econ FICM tune will be most noticeable on the bottom end response "[/INDENT] Values listed in the email are arbitrary. They are simply used to explain the logic/ theory behind it. I am not too arrogant to learn something. Particularly from you as you have more 6.0L trucks in the 10 second arena than most of the other tuners out there. If my thought process on this is incorrect in any way, please correct me. [/QUOTE]