Jump to content

Switching Between V8 And V4?

ALEXANDERJASON

Recommended Posts

ALEXANDERJASON Enthusiast

ALEXANDERJASON

Posted
Posted

i have an 08 vmax 4x4. it seems that even when i am on level ground and cruising on the highway at any speed, if i touch the throttle at all, it moves back to V8. the only time it is in V4 mode is when i take my foot off and coast or when i am going downhill without much foot in the pedal.

 

how about you guys...??

 

i would have thought that this feature would be more useful and save some gas more than it does. i am averaging 13 MPG...

hubbycap Senior Enthusiast

hubbycap

Posted
Posted

Over 5% throttle will bring up 8 cyls. If it takes over 5% on level road you may be going too fast or have too great of a load. I find if I'm running much over 70mph its pretty hard to keep it in 4cyl. Of course A/C and alternator is a load as well and will be a big factor this hot time of year.

03blackz71 Senior Enthusiast

03blackz71

Posted
Posted

Mine stays in V4 alot when cruising on the freeway and also stays on going up hills. I notice that the GMPP touring exhaust helped extend how long the V4 mode stays on. I average 17 mpg but I have gotten over 20 with my truck a couple of times.

ColoradoSkiCountry Senior Enthusiast

ColoradoSkiCountry

Posted
Posted

Do any of the tuners out there have a way of making the truck stay in 4 Cyl mode longer? I have a feeling my truck would do just fine in 4 cyl mode with some of the driving I do when it switches into 8 Cyl mode.

nbscanuck Enthusiast

nbscanuck

Posted
Posted

It all depends on load (hills, wind, hauling something)and throttle position. I drive on a VERY flat section (according to GPS only 5 feet difference over 5 miles) and I very rarely get V4 if I'm over 65MPH, due to wind resistance. I drop back to 60 OR less, I'm on almost always. I've found my foot is better at getting and keeping V4 than cruise control. I see the inclines in the road and very slight increase in speed far enough back and it will keep it. Cruise can't see the hills and only increases speed when it feels the hill, then it has to push harder to keep the speed.

 

There was a customer tuner on here a while back that made tunes for V4 mode. So it would hold it longer, start sooner and truck would run better in V4 mode. I guess search and yee shall find :idiot:

BigJayDogg3 Senior Enthusiast

BigJayDogg3

Posted
Posted
It all depends on load (hills, wind, hauling something)and throttle position. I drive on a VERY flat section (according to GPS only 5 feet difference over 5 miles) and I very rarely get V4 if I'm over 65MPH, due to wind resistance. I drop back to 60 OR less, I'm on almost always. I've found my foot is better at getting and keeping V4 than cruise control. I see the inclines in the road and very slight increase in speed far enough back and it will keep it. Cruise can't see the hills and only increases speed when it feels the hill, then it has to push harder to keep the speed.

 

There was a customer tuner on here a while back that made tunes for V4 mode. So it would hold it longer, start sooner and truck would run better in V4 mode. I guess search and yee shall find :idiot:

 

texsrt4

iminaquagmire Enthusiast

iminaquagmire

Posted
Posted

As stated above, at 6% throttle it goes back to V8 mode. Justin at Blackbear tuned mine to a little bit higher throttle percentage. It holds V4 Longer but I also have 3:42 gears so its not for long until I still have to get into it and get it in V8 again. With some lower gears, I could see tuning being really beneficial in this regard.

strafingmoose Enthusiast

strafingmoose

Posted
Posted
Do any of the tuners out there have a way of making the truck stay in 4 Cyl mode longer? I have a feeling my truck would do just fine in 4 cyl mode with some of the driving I do when it switches into 8 Cyl mode.

 

I think no tuner wants to touch AFM, a bit risky of an operation and a new technology as well.

Archived

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

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.6k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    343,007
    Total Members
    8,960
    Most Online
    Brendan C
    Newest Member
    Brendan C
    Joined

  • Who's Online   1 Member, 0 Anonymous, 1,222 Guests (See full list)

  • Latest Articles

  • Posts

    • Grumpy Bear
      Joke Thread

      By Grumpy Bear · Posted

    • Grumpy Bear
      The Peckish Synapse

      By Grumpy Bear · Posted

      You're better read than that Atlas. 😏   British science fiction writer Arthur C. Clarke formulated three adages that are known as Clarke's three laws, of which the third law – that "any sufficiently advanced technology is indistinguishable from magic" – is the best known and most widely cited.   Stribeck and the pivotable Hersey Number isn't voodoo nor snake oil. That part is physics. It's what marketing and bean counters do with it that is snake oil and voodoo.    Stribeck is the relationship between Hersey and the Coefficient of Friction. Within the Hersey Equation if viscosity and viscosity is 'Dependent' on.......heat.......and.......viscosity index or the temperature to viscosity slope.    Specifically Hersey is the viscosity AT THE TEMPERATURE IN THAT LOCATION FOR THAT SLOPE.   Hydrodynamic lubrication exist when the film thickness in the location is 3X the Ra roughness of the surface. This is irrespective of the hardness of the substrate. To obtain that thickness X viscosity is required for Y velocity at Z load. That's a lot of moving parts. It is also impossible to maintain in an ICE but nearly possible with a turbine under constant load.    What does that mean? Error heavy and operate light. Wear is inevitable but the rate of wear and the milage obtainable are a function of prevailing conditions and HABITS. The only penalty is viscous drag and at fractions so low as to be well worth the effort. Double the life, half the manufacturing carbon foot print. Greed is the only impediment.    The materials generated by SwRI are the RESULT not an estimation or a hypothesis.    Don't delude yourself sir, EV's have as many pitfalls as ICE's. We just don't know what they are yet and it will take longer to sort as MARKETING and GREEDY CEO's have had more time to polish the turd they are selling. 
    • Grumpy Bear
      The Peckish Synapse

      By Grumpy Bear · Posted

      You can always count on greed to prey on ignorance and stupidity.    Friend bought a 2019 Ford Flex and asked me about using Valvoline R&P 5W30 in it. Told him give the miles on it and the fact it wasn't yet using oil that it was a good plan. He uses a Valvoline quick change shop for his oil service.   First they tell him that isn't the oil the OEM recommends. He told them he didn't care what the OEM thought. Then they floated the, "But it will void your warranty"    His reply was it's a 2019, there is no warranty and informed them their knowledge of the law was lacking.    Then they tell him 'But it will ruin your motor"!.    Mine to ruin he says. Finally they give in and charge him 150% the semi-syn price    Point it the brainwash is so embedded that even the service industry is drunk on their swill. The public is right behind them. Echoing the same lies on every forum and media platform. If the end goal is indeed EV then I'd say that ship is about built. 
    • CamGTP
      Gas Prices

      By CamGTP · Posted

      Diesel hit $6.00 here today at the truck stop.   Payed $2.79 for E85 today too.
    • richard wysong
      Electrical Problem - solved

      By richard wysong · Posted

      Thanks for posting, I'm sure it will help someone

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...