Regeneration time

[Berrigan]

I have had the truck about 16 months and it regenerates about every 700 miles. It usually takes about 30 to 40 minutes and about 18 to 20 miles to complete. This is running on city streets in stop and go traffic. My last regen took about 80 minutes and about 45 to 50 miles to complete. I actually thought something was wrong and it somehow was stuck in regen. I was headed to the dealer and about 4 miles before arriving it stopped regenerating. The service adviser said if no codes or cels were illuminated to not worry and just drive it. What do you all think. This long regen is unusual from my observations.

 

[Beast2B]

stop and go city traffic is the worst situation for regen. IIRC when you stop, even at a stoplight, it will stop or minimize the regen process until the truck is moving again. it needs airflow to dissipate the heat of burning the soot. hopefully someone with more tech info can chime in, but towing a good load and some highway driving will be the best scenarios for regen efficiency and speed of completion

 

[kthaxton]

In addition to what is said above, stop and go city driving creates little to no possibility of passive regen either.

 

[Berrigan]

stop and go city traffic is the worst situation for regen. IIRC when you stop, even at a stoplight, it will stop or minimize the regen process until the truck is moving again. it needs airflow to dissipate the heat of burning the soot. hopefully someone with more tech info can chime in, but towing a good load and some highway driving will be the best scenarios for regen efficiency and speed of completion

I would agree with that. My travel route and speed situation to and from work have not changed. So my question is why the increase in regen time.

 

[wanderson]

Every time a passive regen is interrupted the soot load average in the DPF goes a little higher thus needing more time to burn off when a full regen is required.

I would agree with that. My travel route and speed situation to and from work have not changed. So my question is why the increase in regen time.

 

[Ram4Sam]

I would agree with that. My travel route and speed situation to and from work have not changed. So my question is why the increase in regen time.

It could be that during the cooler winter months, your truck is taking longer to warm up to optimum operating temps because the cooler weather. I'd bet come spring and summer, you'll be back to what you are used to.

Sam

 

[tp0d]

How do you know when a regen is occuring? Have a monitor or something attached? Other than the heat/smell, I dont know when it happens on my 16

-j

 

[Berrigan]

How do you know when a regen is occuring? Have a monitor or something attached? Other than the heat/smell, I dont know when it happens on my 16

-j

No no monitor. Yes the heat smell. Also the instantaneous mpg drops about 10 mpg. On the streets I drive every day at a steady 45 mph I get between 28 and 30 instantaneous mpg. During regeneration it drops to 19 to 21. If you drive the same level roads and maintain a speed,I use cruse control, it is a very good indicator of regen.

 

[Berrigan]

Thanks for all the replies. I will just keep an eye on things and post if I have any other information.

 

[slingshot383]

On the other board, there is a discussion about wrapping the exhaust pipe and DPF with a high temp insulation and how that is helping with shortening regen frequencies.

 

[josephc1]

I have never noticed regen of any kind except for the few times I have pulled into the garage and could smell diesel fuel, I think that was passive regen. Never seen any messages telling me it was in regen.

 

[Too Tall]

Below is a couple of videos I made on active regens. I would be surprised if you are see an 80 min regen even at stop and go city traffic. If I didn't have the monitor, I wouldn't know it's happening. The first video is a 22 min active regen, the second is MPG vs Active regen. As mentioned you won't get enough heat to overcome the soot generation in city traffic but an active regen works pretty much the same at street stop and go as it does at high way speeds. The only time the regen will stop is when you go to park, neutral and D stopped, the active regen continues. I see 1100 F at idle when active regen.

https://youtu.be/9-QSlKxqyvQ

https://youtu.be/6QvM5QvQD2A

 

[RVTRKN]

You can buy a Edge Monitor that tells you when your in regen. But make sure its the monitor only, if you want to keep your warranty intact. Even though most of the Dealers tend to understand what the Edge Monitor does, some think you have installed a programer. I would remove the Monitor during dealer visits just to make sure some DA doesn't flag your VIN. All it does, is monitor what the OBDII allows to be monitored if you have a devise to read the output , and will leave no signature you plugged it in, its like plugging in a code reader. BTW it reads/clears the codes, that makes it handy as well.

 

[RVTRKN]

Sorry, I should have read and watched video.

 

[josephc1]

Seen my first regeneration in 9 months and about 8K miles on my new to me 2014 2500. Started my truck this morning drove for about two miles when the EVIC reported DPF 100% full beginning regeneration. About 5mi later 90%, a few more miles 80% and in another mile it reported 70% Regen finished. Getting back home was about 10 miles. When pulling into the garage the strong smell of diesel fumes, I'm guessing it's in passive regeneration is that correct. When the EVIC is reporting regen should it clean the DPF to more than 70%?

 

[kthaxton]

Passive regen is nothing more than your engine is working hard enough to create enough heat on its own to clean (and keep clean) the DPF. Active regen is when the PCM senses the DPF is getting loaded and adds fuel during the exhaust stroke in the cylinder to increase temps in the exhaust. This happens quite frequently without you even knowing it. You only get the message that a regen is taking place if your soot load has reached a critical point and your truck hasn't had a good opportunity to do a proper regen. I seriously doubt this is your first regen in 9 months, you probably just weren't aware of all the other times.

 

[RVTRKN]

When the 6.7 goes into regen, you will not be aware of it. There is no info that it will give you, unless the regen can't clean the DPF on its own, usually due to grocery getting style driving. If your getting the DPF percentage message then its in distress. If you get that message again take it on a 30 mile trip at 65mph or better. If it were mine, I would take it on 50 mile trip ASAP with a heavy trailer to help clean the DPF completely.

 

[josephc1]

When the 6.7 goes into regen, you will not be aware of it. There is no info that it will give you, unless the regen can't clean the DPF on its own, usually due to grocery getting style driving. If your getting the DPF percentage message then its in distress. If you get that message again take it on a 30 mile trip at 65mph or better. If it were mine, I would take it on 50 mile trip ASAP with a heavy trailer to help clean the DPF completely.

Friday I'll be hooking up the 10K 5th wheel for a 90 mile run mostly interstate. That I hope will clean it up, wish there was a way to know for sure. Thanks for the reply's

 

[Newsa]

Seen my first regeneration in 9 months and about 8K miles on my new to me 2014 2500. Started my truck this morning drove for about two miles when the EVIC reported DPF 100% full beginning regeneration. About 5mi later 90%, a few more miles 80% and in another mile it reported 70% Regen finished. Getting back home was about 10 miles. When pulling into the garage the strong smell of diesel fumes, I'm guessing it's in passive regeneration is that correct. When the EVIC is reporting regen should it clean the DPF to more than 70%?

I think with active regens, it stops regenerating when it reaches 70%. It hopes there will be enough passive regeneration from that point on.