Originally Posted by
engineermike
Look in your cylinder fuel trims and pick the highest one to log. If they are the same, then #1 will work. But on the gen3, you dont really go by duty cycle. The pcm is always measuring fuel pressure and adjusting the pulsewidth, and calculating maximum pulsewidth based on rpm and cylinder trim. It also calculates what the maximum torque achievable based on maximum pulsewidth and injector flow at actual pressure. Driver demand torque starts falling when the fuel system cant support the driver demanded torque, and if the fuel flow-limited torque falls below brake torque, it will cut throttle. If everything is calibrated accurately, this happens when pulsewidth meets maximum pulsewidth. Its a fascinating system and works well but the torque tables, injector data, and maf curve have to be pretty accurate for it to work.