DPF passive regen question

[rickinAZ]

I take only short hops, so my regens are always active. For those who take long highway runs, and are almost exclusively passive on their regens, does the soot% ever drop below the 8% mark that is the floor for an active regen? Like...does it ever get near zero?

Just curious.

Sponsored

 

[Jeff]

I've never seen soot% below 8, regardless of type of regen.

 

[rickinAZ]

I've never seen soot% below 8, regardless of type of regen.

Cool occupation. Is it as fun as it sounds?

 

[Capricorn]

Never drops below 8%.
After the acive regen, it actually increases at a higher rate than usual for the next few days - about 10% a day. Only after it touches above 40% it stabilizes and grows very slowly till it comes into the 50s. I reach 700+ miles by this time and then it gets another active regen.

 

[rickinAZ]

Never drops below 8%.
After the acive regen, it actually increases at a higher rate than usual for the next few days - about 10% a day. Only after it touches above 40% it stabilizes and grows very slowly till it comes into the 50s. I reach 700+ miles by this time and then it gets another active regen.

But if the Jeep is driven hard (say 80mph, up a grade, pulling a trailer) will the filter eventually completely empty itself passively? Or...is the floor still the same 8% that I get after an active regen.

 

[Capricorn]

But if the Jeep is driven hard (say 80mph, up a grade, pulling a trailer) will the filter eventually completely empty itself passively? Or...is the floor still the same 8% that I get after an active regen.

All the active regens on my Jeep started and ended on the freeway and gives me about 5-10 minutes drive on the freeway till final destination is reached. Even at freeway speeds, after the regen ends, it either remains at 8% or actually fluctuates wildly between 8 to 12% - could be because any unburnt fuel may give a false reading too, till it evaporates. Haven't had the occasion to put more load than regular freeway speeds 65 - 75 mph right after a regen.

 

[TX_Ovrlnd]

It's accurate-ish, I never saw below 8 in my truck but I am sure there was variation in the filter itself that the sensor just wasn't reporting.

 

[Geos7812]

Good question. I will be able to tell you but will be a minute. Have a JLURD arriving any day and will tow in the mountains. Not sure if it means anything, but my f250 would passively go to zero.

 

[Deleted member 59498]

Good question. I will be able to tell you but will be a minute. Have a JLURD arriving any day and will tow in the mountains. Not sure if it means anything, but my f250 would passively go to zero.

Pretty sure it is 8% or so by now

 

[Capricorn]

Had 5th regen an hour ago at 3570 miles on the odometer (715 miles travelled after the last regen). Was at 52% soot, it jumped to 75% when regen turned on, and regen finished at 8%. I was 3 miles from home with about 2.5 miles to the exit. Drove for the next 2.5 miles at 70ish mph. Soot never went down below 8 but by the time I turned the Jeep off, Scangauge showed soot at 9%.
It appears 8% is definitely the floor.
BTW, my first oil change was done at 3200 miles by the dealership. They did the oil change correctly using the oil specified in the manual (MS-12991). Half of the miles driven between the 4th and 5th regen were on the new oil.

 

[mcjeff]

Mine never has on regens where soot hits 80% first. Always stops at 8. Though, I have noticed that with highway driving, around 775 - 825 or so between regens, it will just jump to 80% and do the whole active process. I HAVE seen this one go to 7 and 4, which surprised me.

I think that must be triggered by mileage or engine hours. It’s not a passive burn (which will also happen, I’ve gone from 79 to 23 between Pittsburgh and Buffalo without an active run).

HTH!

 

[Geos7812]

Got my Jeep on Friday. Installed the Scan Gauge on Saturday and regenned at 50 ish miles. Must have idled getting from the plant to the dealerships. Regenned quickly in town. Took about 5 miles of stop and go! I am not concerned about reign process AT ALL since it happens that quickly.

 

[rickinAZ]

Got my Jeep on Friday. Installed the Scan Gauge on Saturday and regenned at 50 ish miles. Must have idled getting from the plant to the dealerships. Regenned quickly in town. Took about 5 miles of stop and go! I am not concerned about reign process AT ALL since it happens that quickly.

That's a really quick regen. Yesterday mine took nine minutes, and it was the first I've seen that didn't take EXACTLY ten minutes. It's spooky consistent, in my experience, at least.

It's nice to have the ability to monitor regens, isn't it? Don't know how/why people fly blind.

 

[mcjeff]

Got my Jeep on Friday. Installed the Scan Gauge on Saturday and regenned at 50 ish miles. Must have idled getting from the plant to the dealerships. Regenned quickly in town. Took about 5 miles of stop and go! I am not concerned about reign process AT ALL since it happens that quickly.

Exactly. Especially with the ScanGauge, it’s a non-issue. The Internet had me scared with my first Jeep because it sounded like an awful process, so I went 3.6.

My second is a diesel and I’m glad I went that way. Such a better motor.

 

[rickinAZ]

The Internet had me scared with my first Jeep because it sounded like an awful process, so I went 3.6.

There are a lot of Ecodiesel critics on here. Unfortunately, hardly any have actually test-driven an Ecodiesel let alone have hands-on ownership experience.

Sponsored