[dieselenthusiast]

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

The EcoDiesel doesn't reach high enough EGT temperatures to trigger a passive regen unless it's most likely towing. 65% soot level and the 3rd EGT sensor needs to hit about 700*F to trigger a passive regen.

EGT 1 = pre turbo
EGT 2 = Turbo out
EGT 3 = DPF inlet
EGT 4 = SCR inlet

 

[the man in black]

The EcoDiesel doesn't reach high enough EGT temperatures to trigger a passive regen unless it's most likely towing. 65% soot level and the 3rd EGT sensor needs to hit about 700*F to trigger a passive regen.

EGT 1 = pre turbo
EGT 2 = Turbo out
EGT 3 = DPF inlet
EGT 4 = SCR inlet

This does not sound like a passive regen. Passive regens happen passively as it turns out. They only need high enough temps to occur.

Also good to see they only need to "most likely" be towing now as well.

 

[dieselenthusiast]

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......

Optimum combustion efficiency happens at highway speed regardless of towing or running empty. The data shows that when more fuel is used, more unburned particles of carbon (soot) is being sent downstream. It's the nature of the beast. We can see it reflected in DEF usage. More fuel consumed = more DEF consumed. Regens increase exhaust temperatures in order to burn off the soot inside the DPF. The higher exhaust temps require more DEF to be used to keep the NOx numbers within spec. This means that more DEF is used during a regeneration.

 

[dieselenthusiast]

This does not sound like a passive regen. Passive regens happen passively as it turns out. They only need high enough temps to occur.

We know when a passive and active regen occurs based on the data. Not everyone can see the data. All regens (passive and active) require certain RPMS/temperatures/DPF capacities to be met before a regen occurs.

Also good to see they only need to "most likely" be towing now as well.

I suppose someone who has a heavy load of cargo running in hilly terrain could generate enough heat to trigger a passive regen. Based on the evidence we've seen, the only time a passive regen has been documented is while towing.

 

[dieselenthusiast]

I contacted GDE to get his input. In regard to my 2015, here's what he said:

"The mileage interval for active regens when towing should be longer, as the higher heat in the exhaust and higher NOx mass flow promotes passive regeneration. It will be a max of 800 miles at which point an active regen is requested as failsafe."

 

[the man in black]

You should probably go ahead and just ask gde what a passive regen is. You didn't belive anyone else when they told you towing should increase time between regens.

Wait they didn't change the definition of passive did they?

 

[dieselenthusiast]

You didn't belive anyone else when they told you towing should increase time between regens.

It only increases time in-between active regens since passive regens are occurring during that time. If one disregards a passive regen, then yes, I would be in agreeance.

Most people are regening and don't even know it because passive regens happen with no EVIC message.

 

[gsbrockman]

Hmm. Here I thought that towing creates more heat, negating the need for frequent regens.
Shows you how little I know.

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......

I contacted GDE to get his input. In regard to my 2015, here's what he said:

"The mileage interval for active regens when towing should be longer, as the higher heat in the exhaust and higher NOx mass flow promotes passive regeneration. It will be a max of 800 miles at which point an active regen is requested as failsafe."

Left scratching my head as to why you didn’t get this previously.......

 

[dieselenthusiast]

Left scratching my head as to why you didn’t get this previously.......

Jimmy said there were fewer regens, which is true if you discount the passive regens.

This is one problem with hidden technology. Some people think their truck never regens because they don't see notifications. Others think that an active regen is the only type of regen, which isn't true either.

 

[the man in black]

What a joke. I love this thread.

I also love how the story changes and adapts as it goes on.

Only when towing becomes most likely.

Over 700f becomes over 700f and soot load over 65% and most like towing.

What else is going on? Probably should change most efficient combustion only happens at highway speed next.

 

[gsbrockman]

Everything went well with the Y43 update today.

Additionally....looks like I received the grid heater relay update as well.

I will be tracking my DEF usage (like always) and see what changes, if any, come from the update.

A copy of my repair order:

 

[dieselenthusiast]

I will be tracking my DEF usage (like always) and see what changes, if any, come from the update.

Do you keep track of it manually or electronically?

 

[gsbrockman]

Manually.....but might work on a spreadsheet sometime this weekend.

 

[dieselenthusiast]

For the last two years, my DEF consumption has been averaging 2.08 gallons per month.

 

[99lbcummins]

I feel like I'm on a merry go round.

Sent from my SM-N950U using Tapatalk

 

[gsbrockman]

For the last two years, my DEF consumption has been averaging 2.08 gallons per month.

Not sure how that’s useful to know; I track mine by MPG....so I can see any trends.

 

[j98]

Not sure how that’s useful to know; I track mine by MPG....so I can see any trends.

Not sure why how much an Ecodiesel uses is of any use on this forum either...

But on the topic, does Red Rider use more DEF then white lightning? Ive put about 1800 miles on my '14 and I think it's around 3/4 tank.

 

[dieselenthusiast]

Not sure how that’s useful to know; I track mine by MPG....so I can see any trends.

I mostly document to keep track of monthly/annual expenses. If I were mostly running on the highway, I'd be more motivated to document mpg, but it would be difficult to see any trends with my driving habits. Would you document DEF mpg if you were me?

 

[dieselenthusiast]

But on the topic, does Red Rider use more DEF then white lightning? Ive put about 1800 miles on my '14 and I think it's around 3/4 tank.

I bet the answer is yes. It seems like everyone who has a 2020+ Cummins complains about heavy DEF usage compared to the previous generation.

 

[Jimmy N.]

For the last two years, my DEF consumption has been averaging 2.08 gallons per month.

I need to change how I measure the DEF usage.

Have been keeping track of it as miles per gallon, which makes it appear as if the 3500 is using quite a lot. Which it is, when driven.

By instead counting how much is used per month the picture would be much brighter. That's because it can sit for six months at a time.

I could vastly improve the fuel consumption numbers, too, by documenting gallons used per month instead of miles.