Mountain Living

the man in black said:

For the passive regen monitoring, does it just let you know when the temps are high enough to be passively burning?

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I don't have a monitoring tool that reads EGTs, but all three EGT sensors can be displayed with the correct tool. The passive regen happens when the EGTs reach around 700*F.

Murphjd25 said:

I don’t even know if my truck regens? 🤷🏻‍♂️

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Neither of mine do....🤙🤙🤙🤘🤘🤘🫶🫶🫶👌👌👌

gsbrockman said:

Well......Jimmy is right, Rhett.

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Jimmy is right that towing creates more heat. Towing puts a higher load on the engine which means more fuel. More fuel = more soot. More soot = more frequent regens. We just don't visually see the regens happening. Passive regens only occur when towing.

Lmao wtf wow.

dieselenthusiast said:

A passive regeneration only occurs when towing, but the driver doesn't know it's happening.

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I’d like to formally dispute this......

gsbrockman said:

I’d like to formally dispute this......

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I'm speaking on behalf of the EcoDiesel. This has been widely discussed on the EcoDiesel forum. Unless the owner/operator is towing, the EGTs won't get hot enough to trigger a passive regen. This is why the EcoDiesel uses active regens. Once the soot reaches a certain capacity, the ECM will command fuel injection with exhaust stroke to get temperatures to the desired level to initiate an active regen. When towing a heavy load, the temperatures are more likely to cause a passive regen (no fuel is injected).

dieselenthusiast said:

I'm speaking on behalf of the EcoDiesel.

When towing a heavy load, the temperatures are more likely to cause a passive regen (no fuel is injected).

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Umm, so which one is it? You can't tow a heavy load with an Ecodiesel.

Or at least not very far.

@gsbrockman, I know a guy on the forum that has both an EcoDiesel and a Cummins. Here's what he said regarding the Cummins, "When on the freeway, traveling long distances, at high speeds, or under load, I have watched the %soot level go down because the passive regens were so effective. That would lengthen the time for an Active regen."

dieselenthusiast said:

Towing creates more soot which means more frequent regens. The purpose of a regen is to change soot to ash. The EcoDiesel has two types of regens.

1. Passive (EGT's are high enough that no fuel is injected)
2. Active (fuel injected during exhaust stroke)

Most people are regening and don't even know it because passive regens happen with no EVIC message. I have a tune that lets me know when there's a passive and active region occurring.

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dieselenthusiast said:

I don't have a monitoring tool that reads EGTs, but all three EGT sensors can be displayed with the correct tool. The passive regen happens when the EGTs reach around 700*F.

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If you aren't monitoring egts how do you know the truck is passively burning?

the man in black said:

If you aren't monitoring egts how do you know the truck is passively burning?

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It's been written into the tune to display on the dash.

dieselenthusiast said:

It's been written into the tune to display on the dash.

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So it displays anytime the egts go over 700f? Interesting.

Just cruising down the highway at normal speed, not "high speeds" my post turbo egt is over 700f. And I don't even have to travel long distances. Loaded or towing and my egts are usually over 1000f post turbo. Now those aren't pre dpf temps so they'd be a tad lower.

gsbrockman said:

Well.....makes one wonder if the differences are due to:

• Efficiency of the Cummins
• Efficiency of the emissions equipment
• Overall [stock] tuning parameters
• Amount of research and development and testing of emissions pieces
• Overall thermal efficiency

In any event.....my DPF gauge spends a huge amount of time.....displaying nothing.....which is a good thing.

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That would make sense. Based on what he's saying, the Cummins doesn't have to be towing to have a passive regen. He's seeing a passive regen "traveling long distances, at high speeds". Unlike the EcoDiesel, the Cummins doesn't have to be under a load.

gsbrockman said:

I’d like to formally dispute this......

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Objection!

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the man in black said:

So it displays anytime the egts go over 700f? Interesting.

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No, it would only display when the system goes into a passive regen, which is 65-66% DPF soot capacity for the EcoDiesel.

Murphjd25 said:

I don’t even know if my truck regens? 🤷🏻‍♂️

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I’ve only noticed one regen when we bought ours. It was warm out, windows up, AC on, and the IT guy at the dealer was in the back seat explaining the electronics and dash stuff. RPMs increased a little for a minute or so then back to normal, nothin since. And no, I’m not at Mr @rubberfish ranch burnin the good stuff with em. 😜😜

dieselenthusiast said:

No, it would only display when the system goes into a passive regen, which is 65-66% DPF soot capacity for the EcoDiesel.

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So your saying the eco diesel only passive regens when egts are bove 700f and dpf load greater than 65% and when towing?

dieselenthusiast said:

Jimmy is right that towing creates more heat. Towing puts a higher load on the engine which means more fuel. More fuel = more soot. More soot = more frequent regens. We just don't visually see the regens happening. Passive regens only occur when towing.

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I think you’ve overlooked a possibility that there’s sometimes a sweet spot of towing somewhat heavy that will heat things up efficiently, not load the soot cooker up excessively, and continue with passive regenerations and oftentimes will not require any (or very few) active regenerations......

gsbrockman said:

I think you’ve overlooked a possibility that there’s sometimes a sweet spot of towing somewhat heavy that will heat things up efficiently, not load the soot cooker up excessively, and continue with passive regenerations and oftentimes will not require any (or very few) active regenerations......

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Hmmmm. Sounds like my truck. It likes 1800 to 2000 rpm’s in any gear. AHA ! Another sweet spot!