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EGT is what makes you go into regen, when running highway speed turning optimal RPM you won’t use much.When you ride around in hauling nothing you use more to offset the emissions from sulfur I believe. My semis do the same thing,pyrometers are the only way to monitor where the engine is at on exhaust temperature.Thats why you should order the truck with the proper gears for its intended service use. I posted something awhile back about a peterbuit we had that would go into regen constantly and my mechanic wrapped the exhaust to keep the temperature up and it cured it. Idling is no dice on the newer trucks that’s when they plug up and suck def fluid, should only idle to bring down coolant after a hard pull.
In my heavy towing experience (11K miles this past summer), I have found the exact opposite. With hot EGT in heavy towing mode, it seems like my regens have been farther apart or not happening as often.
Could be me as well, I have not documented this as exact science... yet.
I use the cheap stuff at Wal-Mart. Regarding the gauge not moving, it takes about 1000 miles to use a gallon. If the DEF tank is full, the gauge doesn't move at all for many miles. I think I go well over 1000 miles before the gauge moves. "Full" seems to be 6 gallons to 7.5 gallons.
The DEF tank on the 2017 Superduty with the 6.7L Powerstroke engine is 7.4 gallons.
[QUOTE=Top_Speed1;17698444]In my heavy towing experience (11K miles this past summer), I have found the exact opposite. With hot EGT in heavy towing mode, it seems like my regens have been farther apart or not happening as often.
Could be me as well, I have not documented this as exact science... yet.[/QUOTE Yes, higher EGT temps and you should not be regening as often when the engine is running higher rpm cause it’s burning cleaner (less DEF used) cooler EGT and you regen more often and use more DEF.
On the Heavy Towing-
My belief is that the regens is less often, but the DEF guzzles away. I see no less DEF usage, seems actually like more. This may stem from the actual exhaust 'volume' itself being released, rather from a so called hotter/cleaner higher RPM exhaust. Not sure how the DEF system works under load vs. non. So 2 separate things the way I see it; less frequency of regens but more DEF consumption.
I just ran a 3k mile trip (lightly loaded) no towing.
I'm using Forscan Lite on my iPhone/iOS device to monitor RE-Gens.
My observations - via 1400 mile (non-stop) interstate drive (very little idling)
Driving 75-85 mph in temperatures below 30 degrees (1800-2000 rpm)
COLD temperatures seem to effect the frequency of Regens & how quickly the filter fills.
ForScan showed different percentages of Exhaust Filter full compared to the dash -
the dash monitor % of full would display 0% full until Forscan reached 25%...and then would eventually "catch up" as the filter reached full.
the system Regen's every 500 miles (497 to be precise) no matter how full the filter is:
I saw Regens occur as low was 37% (of filter full), when i reached 497 miles (since last Regen).
Around town in very cold (11*) weather i reached 65% full (dash) and then continued on the interstate - steady cruising 80mph - Forscan showed only 15% full and for the next several 100 miles the dash remained at 65% (so long i thought i might have a bad sensor)...once i reached 497 miles since Regen the system activated (Forscan showed 37% full).
COLD temperatures seem to effect the frequency of Regens & how quickly the filter fills.
Yes, ambient external temperature is but one of many factors that affects the operation of the engine, the DPF and how often the vehicle will go into regeneration.
the system Regen's every 500 miles (497 to be precise) no matter how full the filter is
I believe this has been mentioned in other threads on the forum (~500 mile regen no matter the status of the DPF filter).
My regens were happening every ~300 miles or so. Once it started getting colder, my average distance per regen is 497 miles (per FORScan).
That’s how Ford has there system set up it regens by mileage and not by restricted flow,Isuzu (GM) has flow sensors on inlet and outlet of DPF more efficient and less fuel and DEF wasted and better #’s for overall annual cost.$$$
It’ll be interesting to see how many DPF’s crack from overheating because of it! $$
I love Ford,but they should have left the diesel building to outside sources.Just saying.
mine has been a little back and fourth.I get about 3000-5000 miles per DEF fill up.
Normal driving around time it seems to not even be noticeable. When i long hauled from Central Arizona to Denver Colorado i had a noticeable usage.
I honestly use the Walmart stuff pretty regularly and have no issues so far.
Scored on 3 boxes of DEF BLUE @ $4 a box the other week at Frys (Krogers, King Soopers or whatever you call in in your neck of the woods) due to damaged boxes (bottles inside were 100% OK). I haven't noticed any difference between the Walmart stuff and the name brand stuff except the bottle and price.
i have a really hard time determining when a regen is happening or not.
Prior to my use of Forscan Lite the only way i could determine a Regen was occurring was by watching the percentage of filter full screen
Now that I'm using Forscan Lite (on my iOS device) - i can actually SEE the PID for % of full and the REGEN status (active or off).... in the screen shot below - I've outlined (in red)
"current regen status"
distance since last regen
average miles since regen
percentage of dpf/filter full
I monitored these items during my recent 1400 (x2) non-stop journey -
Originally Posted by diamondbackmike2004
under load?
im not sure what you mean under load?
in the instance where i had the % of filter fill reading go from 0% to 100% and back to 0% - i covered only 90 miles.
i was driving it quite hard and the truck was unloaded / empty (only myself as a passenger).
Prior to my use of Forscan Lite the only way i could determine a Regen was occurring was by watching the percentage of filter full screen
Now that I'm using Forscan Lite (on my iOS device) - i can actually SEE the PID for % of full and the REGEN status (active or off).... in the screen shot below - I've outlined (in red)
"current regen status"
distance since last regen
average miles since regen
percentage of dpf/filter full
I monitored these items during my recent 1400 (x2) non-stop journey -
im not sure what you mean under load?
in the instance where i had the % of filter fill reading go from 0% to 100% and back to 0% - i covered only 90 miles.
i was driving it quite hard and the truck was unloaded / empty (only myself as a passenger).
I wish i had the filter % screen...i asked for it at the dealership and they looked at me like i had a third eye.
I have a little Bluetooth module coming soon and plan on using for-scan lite and torque pro to monitor stuff.
load like hauling anything. i see the fastest DEF usage when im pulling a load.
