Compression Ignition Addict
Join Date: Oct 2010
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After you own that truck for a while, You will start to not notice the Active Regens, Because they are just not a big deal. You don't need to do anything special, The computers just take care of the task of cleaning up. Hence Ford gives you a 2 second message that regen is starting and you forget about it. If you watch your instant fuel mileage you may notice your mileage is down a little bit until the Regen is complete. Or you can get a display that will show that a regen is in process.
The exhaust systems on our trucks has several components, There is a CAT in the system that helps raise the heat. The Diesel Particulate Filter (DPF) collects the soot and periodically preforms an active Regen where raw fuel is pumped down the exhaust system to create high heat that burns the soot into ash that blows out of the exhaust and lands on the street, as basically dust. And last their is the Selective Catalytic Reducer ( SCR) where the Diesel Exhaust Fluid (DEF) is injected. DEF reduces the amount of Nitrates that the exhaust contains. Nitrates are created during High Combustion Temps in the combustion chamber. High Combustion temps usually happen when your turbo is pushing extra air into the cylinders.
If you install a Pyro or EGT gauge, You will see that your engine idles around 300° temp. Driving 70 mph down the hiway in 6th gear at 1500 rpm equals about 475-490° Pulling a trailer up a 7% grade = 900°. Flooring it off a red light to race a ricer next you = 1000°. The DEF fluid is injected when you have those higher temps. So basically when the truck is working hard.
Our trucks can also do a Passive Regen. Meaning that the exhaust system will try to clean as much soot up as it can using waste heat from normal driving. As opposed to an Active Regen where excess fuel is pumped in. A passive regen will happen any time the exhaust temps exceed 572° and it will last for as long as the heat is present. So towing a trailer up a 7% grade at 800-900° temps, means you have a passive regen for the entire climb up the grade.
If you tow a lot, Your Active Regen cycles will spread way out, because the passive regns are doing most of the work. If you do a lot of city driving, you will see more active regens, because you just don't get and keep the heat up over 572°.
2015 F350 CC SRW LWB Lariat, Leveled, BAKflip, Ultra Predator wheels with Toyo A/T 295/65R20, Firestone Airbags and onboard compressor
2011 F350 CC SRW LWB Lariat - Gone