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[GEARJAMMER]

Originally Posted by YT90SC

The thing here is a matter of definition. Active regen is when the PCM commands excess fuel into the DPF to burn out the soot. When the engine is operating at a level where there is less oxygen than fuel, it will soot. (heavy load with low boost for the engine rpm and load) So when you have your foot in it hard, it is going to active regen more, because more soot means more plugging and more of the PCM stepping in and doing something about it. Passive occurs at mid level loads where there is a surplus of air and still enough exhaust heat to burn off the soot. The PCM has nothing to do with it.
Basically there is a fine line between right foot positions where too little or too much will lead to more active regens. But when baby bear is just right....

This is where I have to disagree. The original explanation of a passive regeneration was to work the motor hard enough to get the exhaust hot enough to burn the particles out of the DPF. When you do this, you create more soot even at "mid level loads." That's a given. If you drive as you suggest, you are creating less soot and the exhaust will never get hot enough

Maybe someone can tell us what the exhaust temperatures run during an active regeneration. I would think for a passive regeneration to burn off the soot particles, the exhaust temperatures would have to be very close to the exhaust temperatures during an active regeneration. That is simply not going to happen

Shawn