Ok, i'm needing help with tuning a 6.7l. I understand how to increase boost, and torque limits, and driver demanded torque. I need help with the timing, and fuel. How do I go about increasing fuel pressure? Now timing I know where to adjust, but I'm wondering why in some places the map is running negative timing in places where I would think coming from gas, that you would want the timing to almost be 5 degrees btdc. I'll post my tune file in a few mins. Its in a 2015 F550 Brush truck for my volunteer fire dept.