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  #1  
Old 01-24-2015, 09:57 AM
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How many miles?

MY 2015 EcoDiesel... I've gone about 800 miles. My oil life is at 93%. The DEF level hasn't left 100%. I had the DEF tank filled when I purchased the vehicle.

How many miles did a MY 2014 EcoDiesel have to go before you started seeing DEF usage? For all you MY 2015 folks, are you seeing what I'm seeing?

Am thinking it's either the new normal or I have something that's not working properly.

Love the vehicle. Outstanding purchase so far. Wife is shocked at how much she enjoys driving it as well. Very comfortable riding and well outfitted, even without the air suspension.

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  #2  
Old 01-24-2015, 11:33 AM
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Re: How many miles?

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Originally Posted by SCJeepGC View Post
MY 2015 EcoDiesel... I've gone about 800 miles. My oil life is at 93%. The DEF level hasn't left 100%.
It confused me, too, until I realized that the gauge is fixed at 100% and only the semicircular indicator bar changes. To restate: the number never goes down—there's no fill level numerical indication on the gauge. Are you saying that the bar hasn't moved either?

They probably did it this way because the ultrasonic sensor that is used for the DEF tank fill gauge isn't very precise (and, incidentally, is why you must always add at least 1 gallon of DEF each time you add DEF).

I would expect you've probably only used about 1/10 of a tank, though.
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Old 01-24-2015, 11:48 AM
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Duh. Now I feel stupid, but that's normal. Will check the gauge this afternoon.
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Old 01-24-2015, 12:02 PM
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Re: How many miles?

Mine is right on par with my oil life indicator.


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Old 01-30-2015, 10:32 PM
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Re: How many miles?

Oil life is now at 92%. DEF still appears to be 100%, even taking my duhness into account.

Vehicle is going in to fix a trim piece that was damaged on delivery. Still debating as to whether to say something to the techs.
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Old 01-30-2015, 10:47 PM
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Re: How many miles?

My understanding is that DEF usage is related to how the truck is used eg. highway miles versus stop and start traffic, low speed stuff and lots of sitting at idle. It all determines how often a regen occurs. Correct me if I'm wrong....
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Old 01-31-2015, 02:13 AM
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Re: How many miles?

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Originally Posted by ferntree View Post
My understanding is that DEF usage is related to how the truck is used eg. highway miles versus stop and start traffic, low speed stuff and lots of sitting at idle. It all determines how often a regen occurs.
Yes, DEF usage rate is based on vehicle usage patterns, but that's orthogonal to the regen of the DPF.

As far as I understand it, our emissions systems components are configured in this order:

0. Engine
1. PCV (routes exhaust back into the engine intake in order to coke our turbocharger vanes and intakes)
2. DPF (removes the black smoke soot particles and requires periodic fuel-economy-reducing regeneration to burn off the accumulated soot)
3. Catalytic converter
4. SCR (which sprays DEF into the exhaust to eliminate the odorless, tasteless, invisible NOx to make the EPA happy and to reduce our Jeep's reliability, but it does help our exhaust smell have that distinctive hint of cat urine!)
5. Pointless muffler(s)
6. Atmosphere

The DPF (the component that regens) is a completely different component than the DEF system.
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Old 01-31-2015, 09:37 AM
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Re: How many miles?

Quote:
Originally Posted by Roadkill View Post
Yes, DEF usage rate is based on vehicle usage patterns, but that's orthogonal to the regen of the DPF.

As far as I understand it, our emissions systems components are configured in this order:

0. Engine
1. PCV (routes exhaust back into the engine intake in order to coke our turbocharger vanes and intakes)
2. DPF (removes the black smoke soot particles and requires periodic fuel-economy-reducing regeneration to burn off the accumulated soot)
3. Catalytic converter
4. SCR (which sprays DEF into the exhaust to eliminate the odorless, tasteless, invisible NOx to make the EPA happy and to reduce our Jeep's reliability, but it does help our exhaust smell have that distinctive hint of cat urine!)
5. Pointless muffler(s)
6. Atmosphere

The DPF (the component that regens) is a completely different component than the DEF system.

#5 bring up an interesting point after reading about aftermarket and straight pipes. Do these mufflers actually do anything like control drone? I've gathered they do absolutely, or close there to, nothing for sound due to all the upstream plumbing. Maybe they are just holdovers from export models that don't have all the crap ours have upstream.


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Old 01-31-2015, 04:32 PM
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Re: How many miles?

"but that's orthogonal to the regen of the DPF."

1. of or involving right angles; at right angles.
2. (of variates) statistically independent.

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Old 01-31-2015, 05:06 PM
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Re: How many miles?

Quote:
Originally Posted by ferntree View Post
Here endeth the lesson for today!
"Orthogonal" is an everyday word, right? Right?!

Haha, sorry. I didn't mean to be abstruse.

I used the word "orthogonal" to try to compactly communicate the concept "yes, both DEF consumption and DPF regen are affected by driving patterns, but in a way that's completely independent from one another" (because they are different stages of emission control intended to accomplish different goals). Much like fuel consumption and DEF consumption are both orthogonally affected by driving patterns... there's correlation but no direct causal dependency between the two.

Quote:
Originally Posted by dsears00 View Post
#5 bring up an interesting point after reading about aftermarket and straight pipes. Do these mufflers actually do anything like control drone?
I believe I have seen a YouTube clip where someone was running their EcoDiesel without anything attached "cat-back" (or whatever the correct term is when the platform has a pseudo SCR). It sounded about the same to me. I will note that we do have resonator weights on our pipes; I'm guessing they aren't just there for decoration.
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