Jump to content

How do you know if DFM is working?

Phoneline99
 Share

Recommended Posts

MacLaren Enthusiast

MacLaren

Posted
Posted

I think people not knowing shows just how nice DFM really is. I couldn't tell if I tried. Between that and the wonderful 8 speed tranny, coupled with the gas mileage I'm getting, I say leave well enough alone. And, as mentioned above, enjoy the ride;)

  • Like 3
wizard4878 Enthusiast

wizard4878

Posted
Posted
On 8/16/2019 at 8:53 AM, MacLaren said:

I think people not knowing shows just how nice DFM really is. I couldn't tell if I tried. Between that and the wonderful 8 speed tranny, coupled with the gas mileage I'm getting, I say leave well enough alone. And, as mentioned above, enjoy the ride;)

yeah,  what he ^^^^^ said...

  • Like 1
Matty Patty Enthusiast

Matty Patty

Posted
Posted

 

Pickup Truck talk did a video on YouTube called

 

"2019 Chevrolet Silverado dynamic fule management demonstration" 

 

Hopefully this helps

  • Like 3
  • Thanks 1
MacLaren Enthusiast

MacLaren

Posted
Posted

Thanx Matty Patty!

Great video.

GM has a real winner with this new DFM & 8 Speed Tranny.

I have a little over 2,300 miles, my overall average is now 19.6 mpg! That's awesome.

After filling up last, I've driven about 100 miles and my average on this tank is 22mpg and, that's all rural no interstate driving. 

 

  • Thanks 1
Chris Callanan Enthusiast

Chris Callanan

Posted
Posted

I totally disagree with the engineer in the video - I think showing the information similar to what he has on his little silver box on the DIC would be easy and just as cool as seeing what angle my truck is at, or how much air filter life I have left...  I wish this was available.

  • Like 2
Wheelguy Enthusiast

Wheelguy

Posted
Posted
17 hours ago, Chris Callanan said:

I totally disagree with the engineer in the video - I think showing the information similar to what he has on his little silver box on the DIC would be easy and just as cool as seeing what angle my truck is at, or how much air filter life I have left...  I wish this was available.

I think the issue is getting the average Joe to understand what they’re seeing onscreen without the driver thinking something is wrong, becoming information overload or worse yet turning them into a distracted driver. I think going from a consistent deactivation pattern to something more random, for lack of better words, is what ended the display onscreen.

 

Maybe GM will figure out a way to translate it to a more easy to understand form & bring back the cylinder count in the future. They’ve got their hands full right now fine tuning things & dealing with the previously unplanned midcycle refresh then development for T2 will be coming up soon.

Billet Bowtie Enthusiast

Billet Bowtie

Posted
Posted

Most likely another reason it is not displayed is because if you could see all the cylinder changes you would also start to feel when it changes. If you dont know it's doing it you are less likely to notice the "feeling" of the different dfm modes. I honestly rarely felt the dfm activate before I put a exhaust on. Now with the exhaust I can not only hear when dfm kicks in I can also feel the slight vibrations of it changing   cylinders.

redwngr Senior Enthusiast

redwngr

Posted
Posted

There was nothing but bitching about the driveability of the last version of AFM. Thread after thread about how to work with it or defeat it.

 

I'm also in the camp that thinks that not being able to tell it is active is excellent news.

It was probably likely one of the design/development targets.

 

Did I read there are 18 modes it can operate in?

  • 1 year later...
Kanon Morris Enthusiast

Kanon Morris

Posted
Posted
On 8/29/2019 at 10:51 PM, Chris Callanan said:

I totally disagree with the engineer in the video - I think showing the information similar to what he has on his little silver box on the DIC would be easy and just as cool as seeing what angle my truck is at, or how much air filter life I have left...  I wish this was available.

Any chance you remember which video it was?  Searching TFL's stuff and can't seem to find it.

M1ck3y Senior Enthusiast

M1ck3y

Posted
Posted

Anytime your not at wot or under load dfm is working. There's too many variations as to which cylinder's run under different driving conditions to have a readout of how it's performing. It probably wouldn't even be a second before it switched off to a different combination. Which is also why you can't feel it. All you feel is the constant changing of operational cylinders, which is the only feeling you know. Where as with afm there was only V8 and v4; you either had full torque or half of it.  

  • 1 month later...
Luster Senior Enthusiast

Luster

Posted
Posted
On 8/30/2019 at 12:51 AM, Chris Callanan said:

I totally disagree with the engineer in the video - I think showing the information similar to what he has on his little silver box on the DIC would be easy and just as cool as seeing what angle my truck is at, or how much air filter life I have left...  I wish this was available.

I also totally disagree with the engineer that there is no excess wear and tear on the lifters and pushrods!  What a crock!  All in the name of ONE mile per gallon.  One word.  Pulsar LT. 

Adamace1 Enthusiast

Adamace1

Posted
Posted (edited)

I can sometimes barely feel the lugging when driving at a constant speed. I assume this I'd the DFM. I have an average of about 20 mpg for 20,000 miles so far. I do idle an hour or two everyday at work. I get 22 to 24 mpg on trips, even got 27 mpg on flat roads going 60mph. I got the 5.3 4x4 crew cab. In my last 3 work trucks were v6 not ecoboost single cab 2wd f150 I got 12 to 17mpg. So considering I have a crew cab, v8, and 4x4 and always beat the mileage that I would get in v6 ford I would say DFM works pretty well. I estimate I will save over $8,000 in fuel costs going from Ford 3.3 to chevy 5.3 over 200,000 miles.

Edited by Adamace1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,902
    Total Members
    8,960
    Most Online
    whenindoubtuseahammer
    Newest Member
    whenindoubtuseahammer
    Joined

  • Who's Online   2 Members, 0 Anonymous, 350 Guests (See full list)

  • Latest Articles

  • Posts

    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      Its no wonder you've gravitated to the oil types and brands you have in later years after trying certain brands and one being a specialty oil or at least very hard to come by up here and the other would have been a commonly found oil of the era and the vastly different outcomes as a result to using the vehicles in question the same distance for an OCI . It shows what marketing hype can do without actually having the product to back up the claims and that is no different now with the insane claims that are written on the side of a bottle of oil from some of the off the shelf oils.    What has surprised me and I was already finding this out before I bought my truck with the GDI engine, that this newer fancy technology that seemingly would suggest better fuel economy/emissions with this high pressure spray of fuel is not in reality kind at all to the engine or at least the oils life. Yet they insist on claiming long OCI with this technology just like they did with the port or similar type fuel injection systems when in reality its a step back in oil life to have a GDI system.    I think the mistake your making Grumpy is that your not sending your samples to Blackstone and getting the feel good glowing report that you can run it another 1000 or more miles and then send another sample where they say run it yet another 1000 miles and on and on it goes until your sending in something that looks a lot like road tar and then they may suggest you change your oil within the next 1000 miles 😆
    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      I am guessing that engines of that design back then had a better ability to be abused and survive longer than a new design engine with the long timing chain and the overhead cams and phasers etc. But I would never guess that an engine could go that far and not fail spectacularly or at least die a slow death. 
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      In the 80's 90's I'd run Honda's 7,500 miles between changes using Red Line HP 5W20 and do it for hundreds of thousands of miles with issues. Back in the day it was an SAE 20 with the HTHS of a SAE 30 and SN add load. It was also very polar. Oxidation VOA was over 120. Besides those motors were SPFI and lean burn tech. I could have likely run it longer but never did.    We had a Toyota bought new I ran on Pennzoil's latest and greatest synthetic of the day with "Penthane". A made up word for a very low dose of PAO. Tried 7,500 mile OCI's in that Group III/VI chemistry and the rings tapped out at 90K. Rocker box wasn't as bad as the one Punch put up but it wasn't good either. Also a SPFI motor.    I'm around 3,750 across the board on these GDI monsters and the oil it tapped out by then usually on TBN/TAN crossover and color. Red Line HP Euro.    The AMSOIL SS brochures tell you to follow the OEM values for the service class but that it can be run up to 25K if monitored. I can't imagine what motor could go that distance and not tap out. I've never owned one.    Yes, I know. Lot's of people do. I'm just not going to be one of them. 
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      I knew a guy in the early 80's that bought a new Monte Carlo and ran it a 100,000 miles without ever changing the filter or the oil. Just kept adding. It looked like that inside.     
    • whenindoubtuseahammer
      My First Project and GMC has me stumped

      By whenindoubtuseahammer · Posted

      Good evening. I was lucky enough to get passed down to me a 2007 GMC LBZ that was my great uncle's. While the underside and rockers are more or less gone I feel like with time I can restore it to working order since it only has 110,000 miles and he put nearly every option he could get without getting the new body style since he did not trust DEF. So far I have done everything I can think of but when I put the key into the ignition nothing happens. I put 2 brand new batteries in it. Cleaned the terminals. Check all the fuses and relays and they all pass with my multimeter. I know I'm missing something that I just cant think of. The only odd thing is the OBD2 port works which makes me think its not the mega fuse. Any advice would be greatly appreciated. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...