regen frequency

[Newsa]

Apparently, there are some articles showing that soot produced from petro & biodiesel mixes tend to burn off at lower temps in the DPF. I'm trying my first use of b20 this week.

 

[Too Tall]

I read where passive regen starts at about 392 F but it's way too low to do any good and very little soot is burnt.

 

[m35a2]

To see when I'm in active regen, I use Torque Pro.
I found a custom pid for Torque that shows me DPF status. When DPF status goes to 100%, active regen starts. My egr closes (0% on my torque gauge), and my exhaust temps go high. It'll continue like this until I shift into park. egr opens up again, active regen is temporarily interrupted. It resumes when I shift back into drive, until DPF status gets to 20%. Then normal operation resumes.

It kind of torques me off (haha) that FCA chooses not to make the pids available. There is a ton of information in that ODBII interface that's kept hidden from us.

 

[bob53magnum]

There may have been a time or two that I smelled something, but not sure, so in nearly four years of ownership I really don't have any idea when a regen is occurring . But 34K on it , I assume all is well.

IMO I wouldn't worry too much about it, no CEL's or warnings, I'd motor on.

You better get your nose checked, or it is not regenning.

 

[m35a2]

You better get your nose checked, or it is not regenning.

I don't typically smell anything during regen.

 

[kthaxton]

I normally don't smell it either, but there have been maybe 2 or 3 times that I did.

 

[Too Tall]

I have heard the DEF pump pumping/ clicking away when I shut it down during a regen.

 

[kthaxton]

The DEF pump wouldn't be pumping after you shut it down. The clicking you hear is likely the exhaust connections etc as they heat cycle from getting so hot during the regen.

 

[Cummins2014]

You better get your nose checked, or it is not regenning.

What kind of nose check do you propose

You think that truck of mine would be able to go 34K without a regen, and not give any warning. I think not. Many of those miles towing heavy. Like I said maybe I smelled something, but was not sure, and don't care. Not worried in the least. Good mileage, runs well ,no concerns, the least of, is regen.

 

[Too Tall]

The DEF pump wouldn't be pumping after you shut it down. The clicking you hear is likely the exhaust connections etc as they heat cycle from getting so hot during the regen.

Yea, that's a good point, I think I may have heard it when I was idling but out of the truck or possibly the exhaust crackling as you mentioned.

 

[kthaxton]

I sometimes hear the ticking at idle....but I have no idea if the DEF pump "ticks" when it's on or not. I assume it doesn't because I don't always hear the tick....and the DEF pump is pumping 100% of the time when the engine is running anyway, it just doses a bit more during a regen.

 

[JStemann]

My previous 2014 and my current 2017 regen around every 24 engine hours. So, because I do a lot of highway driving, that ends up being about every 1,000 miles. I’ve gone as high as 1,300 or so on my ‘17.
This is monitored with an edge insight.

Also, I could smell it at stop lights with my ‘14. I don’t get any smell from my ‘17.

 

[Newsa]

Just curious if anyone found the preferred hwy RPM that helps these trucks regen? (Either passive or active)

My truck seems to like anything from 1500 to 1900 RPM's. But i don't have a monitor that shows DPF regen info.

 

[kthaxton]

My truck seems to like anything from 1500 to 1900 RPM's. But i don't have a monitor that shows DPF regen info.

Do you drive at any other rpm on the highway typically?

 

[Newsa]

I've been at 2000 and a bit over. But I only have one overdrive gear

 

[Too Tall]

Just curious if anyone found the preferred hwy RPM that helps these trucks regen? (Either passive or active)

My truck seems to like anything from 1500 to 1900 RPM's. But i don't have a monitor that shows DPF regen info.

Newsa,
No I haven't seen any difference in active regens at those RPMs running empty at the same speed. The faster I go, the more exhaust temp and I have fewer or no regens. Towing my TT, I never have active regen nor running highway speeds empty as my exhaust is above 700 or so and that is apparently enough burn soot passively. The more load, even if empty, the fewer regens. From my observation, the exhaust temp stay within 10 to 20 deg F whether in 5th or 6th even though the RPMs are much different. So I guess what I'm trying to say is I think the results are the same between 1500 and 2000 rpm (at the same speed) Sorry for the long winded answer.

 

[Newsa]

Thx. After 4 years and 35,000 miles, I had to take the truck in for a stationary or forced regen at the dealer. My truck didn't have the most recent RRT update on the ECM (apparently). I am finishing a 2800 miles holiday trip today. Yesterday, I had time to take it slow or drive faster, and while driving, I was wondering if taking a slower road and lugging (not really lugging, but loading it at a lower RPM would generate higher EGT's. Or if that wouldn't crreate enough volume of gas to help regen. I know that lugging a gassed will increase EGT's, but didn't know about these diesels.

 

[Too Tall]

Thx. After 4 years and 35,000 miles, I had to take the truck in for a stationary or forced regen at the dealer. My truck didn't have the most recent RRT update on the ECM (apparently). I am finishing a 2800 miles holiday trip today. Yesterday, I had time to take it slow or drive faster, and while driving, I was wondering if taking a slower road and lugging (not really lugging, but loading it at a lower RPM would generate higher EGT's. Or if that wouldn't crreate enough volume of gas to help regen. I know that lugging a gassed will increase EGT's, but didn't know about these diesels.

After 2800 miles of highway, the DPF should be clean as a whistle. I've heard of the dealer putting the wrong flash on the ECM. I suspect that's your issue or you have a bad differential pressure sensor possibly. Lugging little will definitely increase the EGT although it may also increase soot generation. i once made a video showing the EGT difference when lugging (or lower rpm's) if you want to see the temps change. https://youtu.be/cALxd_X6I1o

 

[AH64ID]

Just to be clear running lower rpms is not lugging. Just running lower rpms with a light highway load can increase or decrease EGTs based on load/rpms.

Cummins defines lugging as “Engine "lugging" is defined as operating under a load great enough that engine speed can not increase at wide open throttle (assuming that the governor is not cutting the throttle).”

It can technically happen at any rpm. Cummins also say full throttle below peak torque should be limited to 60 seconds max, and avoided if possible.

 

[Too Tall]

Just to be clear running lower rpms is not lugging. Just running lower rpms with a light highway load can increase or decrease EGTs based on load/rpms.

Cummins defines lugging as “Engine "lugging" is defined as operating under a load great enough that engine speed can not increase at wide open throttle (assuming that the governor is not cutting the throttle).”

It can technically happen at any rpm. Cummins also say full throttle below peak torque should be limited to 60 seconds max, and avoided if possible.

Yes, I totally agree with your comment. We used it a little loosely, it's very hard to lug if even possible with an automatic transmission.