Just for my own education, You may correct my understanding of the definition/reasoning behind "de-acerting" the C15's. My assumption of what was involved in converting the C15 to the earlier 3406E cats was removing the IVA system, going from twins to a single compressor, swapping to an 6NZ ECU,Injectors, and changing some sensors required for the older ecu to function properly.
The reasoning behind removing Caterpillar's ,at the time, latest attempt at conforming to the EPA's newest emission requirements. Just a few of the flaws in the design by Cat were the increased cylinder pressures, the actuators prematurely failing, poor fuel mileage, increased eninge temps, etc.
They raised the compression of the motor and put twin turbos( increase manifold pressure to compensate for the actuators holding the intake valves open a little past BDC) on it to keep the power on par. In doing this they increased the potential/probability of premature headgasket/Engine failure.
So removing the Iva's solved the energy loss from bleeding off the cylinder air on the compression stroke and that gave them the opportunity to lower cylinder pressures by going back to the single turbo that was more efficient at the lower pressures while maintaining the required cfm to produce the same or even more power output. With the compression ratio being higher than the 3406's and the lengthens injection timing from the 6NZ ecu and fuel flow of the early style injectors guys were able to yeild impressive power gains while increasing reliability and fuel mileage.
With saying all that, PDI claims to have accomplished the same goal(IVA delete) by shutting off the function in the acerts ECU( IVA are actuated by oil pressure which is supplied at the command of the ECU determined by the factory programmed calibration in the ECU). Eliminating the need for the added expense & labor of doing the delete by removing/swapping all the parts and pieces previously required to accomplish the same goal.
Now I have been awake for an extended period of time and I am also typing this while traveling from the north east to Texas on my smarter than me Iphone and I have only come to these conclusions by the tireless self-education that the all knowing Google & World Wide Web provides, so this could very well make zero sense to anyone but myself and be so far off track that I have taken what could have been a productive hour of everyone's lives that you can never get back. If so be easy on the flaming
