I know regen occurs roughly every 400 miles but I don't recall if that stands true for both empty and towing miles? I rarely notice when my truck regens unless I'm watching the MPG's on the DIC (drop quickly).

You guy's that have the ability to monitor regens while towing:


Does the 1 regen every 400 miles still count ?

If there are more regens while towing, how many more and how many miles in between ?

Just trying to figure something out is all.

Towing puts a higher load on engine, more fuel, more soot collected in DPF, more EGR being pumped back in.

There is no magic number of miles to a Regen while towing.

Get yourself an Edge Insight and you can monitor the soot mass yourself.

Towing puts a higher load on engine, more fuel, more soot collected in DPF, more EGR being pumped back in.

There is no magic number of miles to a Regen while towing.

Get yourself an Edge Insight and you can monitor the soot mass yourself.


I'm not looking for a majic number, just ballpark figures, examples,etc..

Thanks for the information though :rolleyes:.

IIRC, the ECU will trigger a regen for either ~ 400 miles or sufficient soot mass. From what I've read and heard the later rarely occurs first even with towing. Wouldn't worry about it too much your towing mileage isn't gonna change much either way.

It should regen less when towing because higher exhaust temperature burns the soot before it gets to the filter.

mine regened Way more when towing. I would guess every 200km my milage would jump to 30 l per 100km.

I know regen occurs roughly every 400 miles but I don't recall if that stands true for both empty and towing miles?...........



Yes - I monitor them all like OCD on my DashHawk - The only difference when towing is higher grams of soot to burn off every 400 or so miles.

;)

Interesting. Mine would regen every 200 miles or so towing heavy, about each tank full of fuel.
With the EVO Race on tow mode it regened 4 times in 400 miles

Interesting. Mine would regen every 200 miles or so towing heavy, about each tank full of fuel.
With the EVO Race on tow mode it regened 4 times in 400 miles


Ya think? All bets are off with a tuner.........


:eek:

I've been trying to figure out the rules for regen on my stock LMM. I have not done any towing, but mountain driving is giving me some clue as to how it might act when towing.

My best estimate of the rules so far: Regen occurs every 14 engine hours, every 25 gallons of fuel, or when (predicted) soot mass reaches 40-44 grams. Whichever comes first. There is probably a backpressure limit also, but I have never figured it out. (It KILLS me to see 5.8 PSI backpressure when I floor it and it downshifts to pass!)

My average so far (8000 miles) is a regen about every 370 miles, every 10 hours, every 21 gallons. My pattern is usually 2-3 tanks of around town driving, followed by 3-4 tanks of highway driving. I once hit regen at 212 miles, and once at 511 miles, the rest were clustered around the mean of 370 miles.

When towing heavy you will probably always hit soot mass first - how far apart they are will depend on load, terrain, speed and driving style. Most good drivers will generate less soot than the cruise control. Manually shifting to 5th on grades and reducing speed when towing on grades will reduce the regen frequency. I have seen people report regens every 40 miles when towing in the mountains! (And some can't seem to make one grade without limping due to regen.)

JIMMMY must be doing a great job of featherfooting to continuously get 400 miles - especially when towing! It just goes to show that the driver absolutely makes the difference on regens, mpg, etc.

I have never seen my truck do a "Passive Regen" even when driving 85 mph on cruise control on the flats. It always has to add some exhaust stroke fuel for a regen. Some car diesels (Volkswagons) can do passive regens at 80 mph cruise on the flats - my brother has one.

It only took 1250* at mid throttle 6' from the turbo for me to realize that regen's are not good for the engine.

I checked my log and updated my spread sheet.

So far I have averaged 14.8 MPG, 2.36 gallons/hour, 34.8 MPH, 356 miles/regen, 24.1 gallons/regen and 10.24 hours/regen. That's 8900 miles/25 regens/256 hours of 50% city/50% highway - but each tank pretty much one or the other. When in-city driving I'll almost always regen every 14.1 hours.

The 211 mile regens were in city driving in Denver in January when the truck was new - my commute is so short the truck never warmed up even with a 5 minute remote-start warmup.

Max distance was 508 miles between regens (not 511 as I said above.) That was on a couple of tanks of freeway driving when I held it to 60 MPH to see if I could get 20 MPG. I did - but just barely. I normally drive ten over the limit on the freeway - 85 mph along I25 here on the front range.

That enough boring statistics for you? :D

minevery rarely regens towing -- now after i unhitch the 5er, it generally goes into regen -- just got back from a 600 miles and the only regen was when not towing

Mine pretty much stays in regen constantly while towing 21k on a gooseneck:rolleyes: doesn't seem to matter how I drive it, just matters that I have a heavy load, of course it IS Big Sur where flat means less than 15% slope, still bothers me though especially when I see fuel range 185 miles with a full tank:rolleyes:

My 07.5 regens every 220-250 miles, always towing a trailer. If mine goes into regen in mountainous terrain it can stay there for a very long time. if I'm on sort of flat terrain it last less than half of the time.

When I was collecting data on my regen cycles I could not get a common denominator for when it would start the process. Miles were usually within 50 or so, soot mass was all over the place, back pressure also. I did not have the ability to see engine hours though. ?????

All I know is it sucks when it happens. I lose so much power and it never fails when I am extremely low on fuel looking for a station, poof !! the green fart cloud.

6 more months and the warranty is done. :D

David

All I know is it sucks when it happens. I lose so much power and it never fails when I am extremely low on fuel looking for a station, poof !! the green fart cloud.
David

No kidding! It's almost as if one of the rules started out "If less than 2 gallons remaining, REGEN NOW."