Regen while towing
Regen while towing
Lead Driver
Joined: May 2021
Posts: 5,912
Likes: 3,529
From: Uh oh, CA
When I am towing I typically leave the auto regen turned off. Doesn't matter how far it is. But, I have been turning it back on when I am about 50 miles from the end and let it run through an active regen. I'm already towing and it doesn't really change the mpg, but it makes the truck happy. I have also found that when letting it passively regen for a long time and then running an active regen right before I am finished towing, it takes a long time for the DPF to start building up again when not towing. I just keep an eye on the DPF% while I'm chugging along, but so far, not once have I been towing my camper and watched the DPF climb... it always falls.
Edit to add. My truck is a 22 models, and the pre 20MY trucks seem to regen differently than the 20+MY trucks...
Edit to add. My truck is a 22 models, and the pre 20MY trucks seem to regen differently than the 20+MY trucks...
More Turbo
Joined: Jan 2005
Posts: 568
Likes: 38
From: Henniker
When I am towing I typically leave the auto regen turned off. Doesn't matter how far it is. But, I have been turning it back on when I am about 50 miles from the end and let it run through an active regen. I'm already towing and it doesn't really change the mpg, but it makes the truck happy. I have also found that when letting it passively regen for a long time and then running an active regen right before I am finished towing, it takes a long time for the DPF to start building up again when not towing. I just keep an eye on the DPF% while I'm chugging along, but so far, not once have I been towing my camper and watched the DPF climb... it always falls.
Lead Driver
Joined: May 2021
Posts: 5,912
Likes: 3,529
From: Uh oh, CA
I should have added, mine is a 22. The pre 20MY's seem to act differently. I guess that even though my camper is only 6000 lbs, the wind resistance is enough to work the truck enough to keep the temps up high enough to drop the DPF% passively. Also, all of my regens, whether towing or not, seems to take the same amount of time, or distance anyway... 20 miles.
Super Moderator
Joined: Aug 2008
Posts: 37,384
Likes: 1,868
From: Frederick, MD
EGT 1/4 has to be around 800F for heavy towing to passively regen..
It is all about the EGT's.
It is all about the EGT's.
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Cargo Master
Joined: Dec 2003
Posts: 2,299
Likes: 2,060
From: Central MO
I keep my auto regen off all the time. I had my first two with my '22 over the weekend and was shocked to see the soot dropped from 65% to 0% in an hour towing my 12k lb fiver. My '17 NEVER did that. The soot always climbed when towing, faster than empty. I've put about 100 miles on empty since I got back home and it's still at 0. I'm liking this new '22 more and more!
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Super Moderator
Joined: Aug 2008
Posts: 37,384
Likes: 1,868
From: Frederick, MD
11 to 16's did not have the ability to shut off the regen feature.
But remember heavy towing with my unicorn could keep if from regen too. So if you were to tow a heavy load, you would see the same result.
But remember heavy towing with my unicorn could keep if from regen too. So if you were to tow a heavy load, you would see the same result.
Fleet Owner
Joined: Mar 2012
Posts: 20,168
Likes: 15,997
From: Wisconsin
I just did a 1500 mile trip towing a 20k TH in the Eastern mini-mountains of WV. I left it on auto-regen. I had a total of three regens and if I didn't have an i-Dash, I would have known they were going on most likely. No change in performance, just reduced fuel economy (I only state this because the lie-o meter showed it). I let it go and not worry about the Regen. If you pull into a stop and just start a regen, so what. It will start up again when your DPF RG% gets back to 100. No big deal.
Super Moderator
Joined: Aug 2008
Posts: 37,384
Likes: 1,868
From: Frederick, MD
I just did a 1500 mile trip towing a 20k TH in the Eastern mini-mountains of WV. I left it on auto-regen. I had a total of three regens and if I didn't have an i-Dash, I would have known they were going on most likely. No change in performance, just reduced fuel economy (I only state this because the lie-o meter showed it). I let it go and not worry about the Regen. If you pull into a stop and just start a regen, so what. It will start up again when your DPF RG% gets back to 100. No big deal.