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  #1  
Old 10-05-2014, 08:00 AM
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DPF 80% full message for short trip or city drivers

Folks i really want the diesel but as i would do mostly shorter trips around town this dpf technology has me concerned but not deterred from ordering the ecodiesel.

Its not stop and go traffic but certainly not consistent speeds over 50mph.

I could do an out of town trip once in a while if needed. Still would outweigh the hemi gas penalty.

For those who don't do frequent trips of highway driving to kick off a regen, how many miles/kms do you get w/o filling the dpf up and having to clear it out?

And is that frequency getting longer with the recent updates at all? Or something jeep is working on improving?

Thanks for your input.

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  #2  
Old 10-05-2014, 09:47 AM
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Re: DPF 80% full message for short trip or city drivers

Diesel engines are not a good choice for short trip driving. The savings would come in over the long haul on any diesel.
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Old 10-05-2014, 10:06 AM
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Re: DPF 80% full message for short trip or city drivers

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Originally Posted by Jeep_GC View Post
...Still would outweigh the hemi gas penalty.
Maybe, maybe not.

Short trips on a diesel will only aggravate the issues people have had with DEF and DPF problems.

Fuel economy and the price delta between gas/diesel is only one factor to consider. How you plan on using it, your annual mileage and how long you plan on keeping the vehicle also weigh heavily in determining what your best engine choice is.

But if you really want the diesel then none of the above matters.
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Old 10-05-2014, 11:09 AM
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Re: DPF 80% full message for short trip or city drivers

Hybrids make the most sense for heavy city driving for a light vehicle. For highway driving and heavy vehicles diesels make the most sense. UPS / FedEx use diesels and they have super frequent stop & go but they also allegedly do manual regens as routine maintenance.
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Old 10-05-2014, 12:27 PM
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Re: DPF 80% full message for short trip or city drivers

Cost of the vehicle aside, I'm loooing for others that have this scenario. Got to be a bunch out there.

I plan on keeping this at least 7yrs. About 9000 miles a year. Would still be doing towimg and longer trips its just not the daily commute that is long.
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Old 10-05-2014, 01:25 PM
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Re: DPF 80% full message for short trip or city drivers

I live near destin florida. While it's not block after block of traffic lights. During the tourist season, you spend more time sitting behind rubbernecking tourists than actually moving. My work is a 10minute drive. Speed limits never exceed 45mph. The nearest interstate is almost an hour away and I never drive on it because everything I need is here. Every thing I need is usually within a 20 minute drive, so I rarely travel over that. Exceptions: the day after I bought it I drove 13 hours to WV and back. Earlier this year I made a 12 hour trip to San Antonio and back.

With all that said, I have almost 9k miles on my '14. I've regen'd 3 or 4 times that I can recall. All but once, it has completed the process before I reached my destination. Seems like it takes 5-10 mins and always starts the process shortly after I start a trip.

In other words, the regen process has been a non issue for me, so far.


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Old 10-05-2014, 05:35 PM
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Re: DPF 80% full message for short trip or city drivers

Read this similar thread - Hemi or diesel based on this criteria (Canada)....

.
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Old 10-05-2014, 06:12 PM
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Re: DPF 80% full message for short trip or city drivers

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Admittedly that is my thread but wanted to post on the diesel section as this is really the remaining concern around going diesel for my needs.

Thanks
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Old 10-05-2014, 08:02 PM
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Re: DPF 80% full message for short trip or city drivers

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Originally Posted by MuSh View Post
With all that said, I have almost 9k miles on my '14. I've regen'd 3 or 4 times that I can recall. All but once, it has completed the process before I reached my destination. Seems like it takes 5-10 mins and always starts the process shortly after I start a trip.
In 9K miles you regen'ed closer to 30 times. Our Diesels regen once about every 300 miles. The JGC does not give you any indication its going through a regen unless your DPF is almost full which then triggers a "drive at highway speeds..." message. Once you get this message you MUST drive at highway speeds ASAP to avoid limp mode.
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Old 10-05-2014, 08:13 PM
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Re: DPF 80% full message for short trip or city drivers

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Originally Posted by netboy View Post
In 9K miles you regen'ed closer to 30 times. Our Diesels regen once about every 300 miles. The JGC does not give you any indication its going through a regen unless your DPF is almost full which then triggers a "drive at highway speeds..." message. Once you get this message you MUST drive at highway speeds ASAP to avoid limp mode.
If its around 300 miles i have no concerns about getting to the hwy for a drive. Is that documented anywhere - typical dpf time to start filling up?

So What are the minimum conditions (speed/time) etc that a regen can start occurring and complete?

Thanks
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Old 10-05-2014, 08:18 PM
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DPF 80% full message for short trip or city drivers

I'm referring to the point that it actually becomes a potential inconvenience, and displays the message. I don't care what it does behind the scenes as long as it functions as it should.


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Old 10-05-2014, 09:38 PM
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Re: DPF 80% full message for short trip or city drivers

Quote:
Originally Posted by Jeep_GC View Post
If its around 300 miles i have no concerns about getting to the hwy for a drive. Is that documented anywhere - typical dpf time to start filling up?

So What are the minimum conditions (speed/time) etc that a regen can start occurring and complete?

Thanks
The regen is not schedule based so you can't really formulate it. The PCM measures the back pressure difference before and after the DPF. Once the difference is higher than a specific set value the PCM infers that the DPF is full enough with soot to require a regeneration. It then verifies that some conditions are met to initiate a safe regen. The conditions are supposedly RPM and speed based, but ExcursionDiesel was actually able to maintain a regen by keeping steady RPM. If your driving style generates lots of soot, your regen cycle frequency will dramatically raise.
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