Originally Posted by
tunerpro
The question you mean to ask is, "Does anyone know how accurate the information coming out of the ECU is?"
The ECM calculates an estimated engine torque output (at the flywheel) based on a torque model and other operational parameters such as airflow, timing advance, cam positions, etc. The accuracy of the torque model, and other engine sensors will dictate how accurate the estimated engine torque output is.
I can tell you you're almost certainly making nowhere near 490HP at the flywheel. Based on your mods, I would estimate you're probably around 320-340 at the wheels, maybe high 300s at the flywheel.