Jump to content

Question about V4 mode

ringbuster

By ringbuster
in Engines & Drivetrain

Recommended Posts

ringbuster New Member

ringbuster

Posted
Posted

I know I'm way behind the curve here, but I just switched from  a 2005 Silverado to a 2017 Sierra and have been reading up a little to learn about my new ride.  I have seen a lot about this AFM or V4 mode jazz which is all new to me until now.  I have looked for an answer to the question..Is it on ALL GM trucks?  I watched some videos on youtube pertaining to the cat back exhaust systems and these trucks.  The ones I've seen showed a Manual position on the shifter quadrant and a small window below the speedo showing v4 or v8.   My sierra is a base model 1500 regular cab 8 ft bed two wheel drive with a 5.3     My shift quadrant has a LOW postion at the bottom and no v4/v8 indicator.  I hope that means I don't have that crap on my truck.  I'm old school and only need me and a gas pedal.  Can any one enlighten me on this?   Thanks for any info.

  • Replies 45
  • Created
  • Last Reply
KARNUT Senior Enthusiast

KARNUT

Posted
Posted
I know I'm way behind the curve here, but I just switched from  a 2005 Silverado to a 2017 Sierra and have been reading up a little to learn about my new ride.  I have seen a lot about this AFM or V4 mode jazz which is all new to me until now.  I have looked for an answer to the question..Is it on ALL GM trucks?  I watched some videos on youtube pertaining to the cat back exhaust systems and these trucks.  The ones I've seen showed a Manual position on the shifter quadrant and a small window below the speedo showing v4 or v8.   My sierra is a base model 1500 regular cab 8 ft bed two wheel drive with a 5.3     My shift quadrant has a LOW postion at the bottom and no v4/v8 indicator.  I hope that means I don't have that crap on my truck.  I'm old school and only need me and a gas pedal.  Can any one enlighten me on this?   Thanks for any info.

You have it.


Sent from my iPhone using Tapatalk
goeb34 Enthusiast

goeb34

Posted
Posted

You have it, tune it and chop the exhaust off and have fun with it, just did headers on my 14 6.2 and i average 15.3 and thats not pussyfooting it either cause i like to hear my exhaust and plenty of people say they dont see a mileage difference when its disabled but you dont want it on if you get an exhaust

smakki813 Enthusiast

smakki813

Posted
Posted

You can get something called Range Tech AFM disable, it hooks up to your oem port of your truck and keeps the truck in v8 mode. It’s about 185 on Amazon


Sent from my iPhone using Tapatalk

UGAuChev17 Enthusiast

UGAuChev17

Posted
Posted

I used the Range device for 6 months and it worked perfectly. I didn't see any drop in mileage either. I have since tuned out the AFM.


Sent from my iPhone using Tapatalk

Donstar Senior Enthusiast

Donstar

Posted
Posted
On 8/29/2018 at 3:23 PM, ringbuster said:

 I hope that mea.ns I don't have that crap on my trucI'm old school and only need me and a gas pedal.  Can any one enlighten me on this?   Thanks for any info

Many of us on this forum are "old school" but we still accept improvements.  Shoulder straps and unleaded fuel were criticized when they became mainstream.  The fuel efficiency of your '17 will be a dramatic improvement over your '05 and still deliver more power.  If you can't tell if you have AFM, leave it alone.  I've been driving for the past 10 years with GM AFM and it is unnoticeable.  

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
46 minutes ago, Donstar said:
  On ‎8‎/‎29‎/‎2018 at 5:23 PM, ringbuster said:

 I hope that means I don't have that crap on my truck. I'm old school and only need me and a gas pedal.  Can any one enlighten me on this?   Thanks for any info

I don't have the years on my AFM Donstar has but I'm accumulating a fair number of miles. I do like to drive. In 75,000 I can count the number of times I've 'felt' it go into or come out of AFM. I've had zero issues with it. Personally, it's been good for better than a 5% bump in fuel efficiency. Others will opine other and say it doesn't make 1 mpg difference. I would expect these are the same types that get on a review forum for tires and complain "These are the worst tires on earth. I only got 15 K from them" while not telling anyone that the front end is out of alignment and worn out and they never rotate or check pressures. You get out of it what you put into it. 

"For the believer no proof is needed. For the sceptic no proof is possible". 

KARNUT Senior Enthusiast

KARNUT

Posted
Posted
I don't have the years on my AFM Donstar has but I'm accumulating a fair number of miles. I do like to drive. In 75,000 I can count the number of times I've 'felt' it go into or come out of AFM. I've had zero issues with it. Personally, it's been good for better than a 5% bump in fuel efficiency. Others will opine other and say it doesn't make 1 mpg difference. I would expect these are the same types that get on a review forum for tires and complain "These are the worst tires on earth. I only got 15 K from them" while not telling anyone that the front end is out of alignment and worn out and they never rotate or check pressures. You get out of it what you put into it. 

"For the believer no proof is needed. For the sceptic no proof is possible". 


I didn’t know you put a tune in your truck to test your cylinder deactivation. I did in the summer of 2014 and posted the results on this website. Mine was at 72 MPH didn’t even make a 1 MPG difference. Maybe it would have at lower speeds, but where I drive the speed limits are 70-75. Oh, like you no complaints on the tires. 5 per cent, we’ll see if that’s worth the extra do-das in and on your engine at say 200K miles. At your rate in maybe 4 years, good luck. Me I didn’t make out so well with the 5.7 diesel or the first 8-6-4 test caddy.


Sent from my iPhone using Tapatalk
pronstar Enthusiast

pronstar

Posted
Posted

Let’s say these trucks average 16 mpg.

One group of folks state they notice a 5% improvement in MPG with AFM.
That equates to an improvement of 0.8 mpg.

Another group of folks state they don’t notice even a 1 mpg drop when they disable AFM.

It’s entirely possible that both groups are making accurate statements.


Sent from my iPhone using Tapatalk Pro

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
1 hour ago, KARNUT said:

 I didn’t make out so well with the 5.7 diesel

I loved my 5.7 Diesel, it was in our '82 Olds Cutlass Supreme Brougham!  Miss that car!  Used to deliver pizzas in it and used to bracket race at the drags with it.  If I had kept it longer, I was going to put a 200R4 and a 3.42 gear behind it and "tune" the injector pump for more power.  The Buicks consumed all my attention then and we sold it to our lawn guy.

KARNUT Senior Enthusiast

KARNUT

Posted
Posted
I loved my 5.7 Diesel, it was in our '82 Olds Cutlass Supreme Brougham!  Miss that car!  Used to deliver pizzas in it and used to bracket race at the drags with it.  If I had kept it longer, I was going to put a 200R4 and a 3.42 gear behind it and "tune" the injector pump for more power.  The Buicks consumed all my attention then and we sold it to our lawn guy.

We had 4, nightmares. We converted to gas change the torque converter and never looked back.


Sent from my iPhone using Tapatalk
pronstar Enthusiast

pronstar

Posted
Posted

Why GM thought it was a good idea to build a diesel out of a gasser is anyone’s guess.



Sent from my iPhone using Tapatalk Pro

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

Better fuel lines, stronger head bolts a little more R&D they would have nailed it.


Sent from my iPhone using Tapatalk

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
6 hours ago, pronstar said:

Why GM thought it was a good idea to build a diesel out of a gasser is anyone’s guess.

That's a common misconception, such was not true.  Time would have improved the design, mine was the ultimate "D" block which racers converted to gas for drag racing.  They were essentially legislated out of existence and their successor was the 6.2 and 6.5 used in trucks which are still used by the military to this day.  That LF9 got 24 mpg delivering pizzas all night (never shut off) and over 35 mpg on the highway.  Most folks killed them with dirty oil and trying to spin the engine into the red all time.  

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • taze
      I love my truck but

      By taze · Posted

      Those  headrest speakers look fun! Standard panoramic roof on the AT4X might be a deal breaker for me unless I can delete it. Maybe I should just supercharge my truck and call it a day. We'll see what I think of all the new trucks when I see them in person. 
    • newdude
      Turning radius

      By newdude · Posted

      "Increase"?   You want to "increase" your turning radius?     What is your truck?  What kind of cab and bed do you have currently?  Is it stock?  Modified?  Lifted?  
    • newdude
      Transmission Woes :-(

      By newdude · Posted

      OP's quote is parts and labor.  Not just parts.     The # you found isn't the right one.  But besides that, the right # is the same price within a couple bucks.  $5802.01.    Now, factor in labor and fluids.  Book time is 17.1 hours for a Colorado 8 speed.  At $200/hr for a dealer average rate, its $3420 just in labor.  We are already at $9222.  Fluid and other necessary items, there's your $400-500 more.      Also.  Your "discounted" transmission.  Which is 99% likely quoted off of GM Parts Direct as that's the MSRP I found on their site.    You failed to note the $597 in shipping charges.  So we are right back almost to MSRP.  $5794.  Oh.  AND, you better have the $4000 for the core charge which you'd have to pay and get refunded, AND you gotta pay to SHIP THE CORE BACK.    So now you'd have paid MORE to buy that one online yourself, even after you get your core refunded.  
    • Randy Ginoza
      Turning radius

      By Randy Ginoza · Posted

      I would like to know if I can increase my 2025 Silverado 2500 HD
    • asilverblazer
      Intermittent no-code issues on 2022.5+ V8 trucks — what did the shop fail to capture?

      By asilverblazer · Posted

      Length/amount of data capture will be important to consider, sifting through 5 minutes of a data log can be enormous when it is stored in milliseconds. Being able to find the 'event' let alone decipher it.   Presumably the driver would notice something and hit a button to capture the 'window' of data. That window has to be large enough for the operator to recognize the event and react accordingly.    The data has to be able to be retrieved easily.   The data has to be able to be understood. Which is the biggest challenge, dealer techs won't even know what most of it is and would likely not even look at it if an owner brought it to them. Meaning the owner, the least educated/qualified, trying to understand it.    How will the data be presented? Could specific PIDs be selected and a timelapse graph be watched? How will a specific value be noted as abnormal? Additionally, a good data logger would be able to 'learn' normal values for a specific vehicle and flag abnormalities automatically. It could in theory watch parameters degrade over time and suggest maintenance as needed. (If the MAF reading begins tapering off for a given set of other readings - MAP, throttle position, Ambient, etc.. a flag to check air filter.) With the amount of data available, a device (really the vehicle rather than an additional accessory) should be able to do more than issue a DTC. It should be able to run the full diagnostic suite automatically and present a solution rather than a code. (It's not the 90's anymore). The technology is available for the vehicle to not just say "P0087", it should know low fuel pressure, check other PIDs to narrow down the problem itself, and determine if it is a lift pump, high pressure pump, regulator, leak in the fuel line, clogged filter, etc. Even if it can't narrow it down, it should be able to guide the user to the likely problems.   This would be a major problem for dealer service departments, which are the manufacturers customers it is in their collective best interest to NOT have this available to the consumer.   Further, if the owner is going to be the primary consumer of the data, it's got to be at a consumer price point vs. dealer only specialty tool price.   This group is more 'involved' in their vehicle than general public/consumer and will have knowledge, experience, needs and desires that are quite different from the market at large.   

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...