Yes I always see just a little boost. Same as you.

 

I think you hit the nail right on the head Doug!

My truck's build date was 10/2011. Prior to the reflash in August, '12 that fixed the NOX faults I was experiencing, my truck ran 0 boost running north and south on M-15 south of Bay City. Flat, smooth running about 62 MPH. After the reflash it looked to be 4 or 5 psi on the gauge. I also lost a couple of MPG and it started regening a lot more frequently. My guess is that they changed the timing and duration of the injector fueling events to lower combustion temperatures thus reducing NOX emissions. Reduced combustion temperatures will of course reduce DPF temps, necessitating more frequent active regens.

One system fights against the other! You just can't win with this emissions stuff!

 

with all that in mind..I will not be having my truck flashed with any updates.

 

I had actually assumed that the reason for the difference in boost between his and mine was within the programming on the turbo (the wastegate and VGT). By adjusting how they both operate, it seems like we can put more air in the system without adding fuel and lean the mix down to keep down soot formation. Obviously, that should increase cylinder temps and NOx production though unless we went WAY lean.

 

There was a flash that did change the efficiency of the engine and not an improvement.
In early 2012, I lost two MPG. I always blamed my tires but the "math doesn't add up" so to speak.
Tires are certainly a big portion but it has been proven on here too many times that Ford change something and we burn more diesel.

Since that time, my regenerations have not been as efficient as they were.
Before, I could reach as low as 1.14 soot GPL. Now, a good clean burn is mid 1.30's, usually low 1.40's.

Mine has always had 0 psi boost on level roads as well and that remains the case.
I see this a lot on the 45 MPH 2 lane I travel to and from work.

 

Your truck is getting older Kper05 and as it ages, the DPF will slowly begin to permanently clog itself up. 1.30 to 1.40 is normal for a truck with more than a few miles on it. I can get mine below 1.00 towing the camper, but normal unloaded regens rarely ever get below 1.30.

 

DPF's will load up over time but there have been very few that ever were completely full unless there were other issues.

 

Hey Scott, step back and look at what you're asking here. Isn't it nice that you can't tell what/when a regen cycle is doing?

This is the big point I like. The active/passive regen system is so much more refined that we don't really know when it is going on. I love the fact that it is now a process that we can just completely ignore.

I'm sure the curiosity is driving you nuts, but really, it's not something we need to waste energy on.

My truck will do a clean out and I usually think that it's just time for it to do it and then I forget about it.

 

Senix, I'm glad you brought that up. I'm at 1900 miles of which only 620 was towing. It's a long story but I own 4 vehicles and find I have to drive the truck to the golf course, so that's all it's been towing since I got home. I have seen only one cleaning down in fort myers and I thought I smelled one on the trip home. I could have missed them. I guess the message still flashes on the dash. I wasn't sure about that as my owners manual doesn't seem to mention it.

 

The message still shows, about 3 seconds worth. The intervals are much different with the 6.7.

I never had a problem with my 6.4 and its intervals or the performance of the motor during the events but the reason we all tracked it in the 6.4 is the usefulness to spot something going south.

 

Also using Amalgamated TDRS/FL additive, started about 4 or 5 tanks ago..

A month ago I pull the RV to a service center to leave it; passive regen takes it down below 1.00 for the relatively short trip of about 20 miles at 70 MPH against head wind.

About of week later I am returning to work following lunch and I realize the truck is in regen; I'm thinking why? as it was somewhere around 1.7 on the soot count. I was less than mile from work; I get there, shut it off and then remote start it so it can idle for 5 minutes as I have found this is effective at getting the most out of the fuel already in the exhaust.

Then I get to thinking I was over 500 miles since last regen and it must have been mileage based.

A few days later after I have exited the Interstate and am about 1/8 mile from house it goes into regen again; I put it in 'park' at a traffic light and the regen stops. I'm thinking it wants to finish that mileage based regen.

I think I was at +600 miles from the last full active regen. I am expecting it will regen the next time I drive it; but not so.

RV Service center calls that my RV has been repaired; I go pick it up; passive regen gets soot count down close to 1.0; that was a week ago Friday.

Today I am driving on the Interstate back home (soot count was somewhere north of 1.8) and I hear the audible alert on the Insight that I have for exhaust temperature and realize I am in active regen. This was 870 miles since my last fully completed active regen; with the two uncompleted in between.... Only reason I knew it was in regen was the audible alert caught my ear. It must have been going a minute or two before as my alert is for 1200 degrees. I reset my B Trip, it was at 1.7 when I noticed it was in regen; it continued for just over 10 minutes and took the soot count down to .75 before ending; once out of regen it dropped to .74.

Point is, if you had a mileage based regen event occur just before you shut it off you probably would never see any fuel economy hit; and it apparently doesn't try it again on the next restart.

Bob

 

I think its far easier to miss a regen in the 6.7. The 6.4 would sound different and stumble in regen (on occasion). The 6.7 is almost indiscernible outside of lower FE and exhaust sound.

Unless you had trailer towing (passive regen)...I think you may have missed one.

 

Since I am only doing city driving lately and no highway, I don't even think I am getting 50 miles between regens. They almost never can complete. I really need a monitor so I know where I am at and what is going on. Mainly because of curiosity.

I am down on mileage as a result - from my usual 14-15 to 11.5 - 12.5...

 

On one of your next regens you may want to drive the truck until it completes the process. This way you can go further between regens.

 

I'm surprised no one has chimed in with a statement that regens are improved or made worse with certain brand oils!