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ib516's avatar
ib516
Explorer II
Jul 04, 2017

Duramax Torque Management

So I know there's a lot of talk about Tq management on these forums.

For those who aren't familiar with the term, "torque management"
is a term used to describe the situation when a manufacturer purposefully reduces engine output/power by computer in certain situations to protect various parts of the driveline such as transmission and axles.

In this video, the Chief Engineer for the Duramax HD trucks says they limit power in 1st gear, and full power is available in 2-6th gears. It would be nice to know (from a reliable source like in this case) in which gears Ram and Ford limit output. I'm confident they both have the same feature.

Here's the video interview:
VIDEO
Note that I modified the link so the video starts at the point where tq management is discussed (12:48).
Tow Vehicles

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  • ShinerBock's avatar
    ShinerBock
    Explorer
    Jul 04, 2017
    transamz9 wrote:


    The Aisin locks the TC in 2-6.


    I am not saying you are wrong, but I could have swore that one of the tuners on the Cummins Forum said it doesn't lock up in gears 2 and 3 while accelerating. From what I remember, he said it is only on deceleration while the exhaust brake is being used that it locked up in those gears just like the 68RFE.
  • transamz9's avatar
    transamz9
    Explorer
    Jul 04, 2017
    ShinerBock wrote:
    I know that the Ram Cummins 68RFE does not give full power or lock up the torque converter until 4th gear when accelerating. A locked torque converter will send 100% of the engines horsepower to the transmission, and an unlocked torque converter will not. This is one major reasons why a Cummins feels so sluggish off the line versus a Duramax.

    My custom tune locks the TC from 2-6th and makes a world of a difference in the trucks off the line acceleration without adding much power to the engine. Once the torque converter locks, the truck just pulls like a train. Without it locked, it just makes a lot of noise at higher rpms going nowhere fast.


    The Aisin locks the TC in 2-6.
  • kw_00's avatar
    kw_00
    Explorer
    Jul 04, 2017
    Thanks for sharing, i had the Tq management reduced on my truck via tune, what a difference.
  • ShinerBock's avatar
    ShinerBock
    Explorer
    Jul 04, 2017
    I know that the Ram Cummins 68RFE does not give full power or lock up the torque converter until 4th gear when accelerating. A locked torque converter will send 100% of the engines horsepower to the transmission, and an unlocked torque converter will not. This is one major reasons why a Cummins feels so sluggish off the line versus a Duramax.

    My custom tune locks the TC from 2-6th and makes a world of a difference in the trucks off the line acceleration without adding much power to the engine. Once the torque converter locks, the truck just pulls like a train. Without it locked, it just makes a lot of noise at higher rpms going nowhere fast.
  • BenK's avatar
    BenK
    Explorer
    Jul 04, 2017
    Very interesting !!!!

    Proof too that ignorance is bliss...until something goes wrong...then the questions of 'why????'...to then argue against info/advice/etc based on their ignorance...PS...ignorance does NOT mean dumb...but uneducated on that topic...

    How about some info on when they start cutting 'power mode' and how many they have (secret and think not going to get much info there).

    Again, very interesting and thanks for the post...appreciate it
  • spud1957's avatar
    spud1957
    Explorer
    Jul 04, 2017
    ib516 wrote:
    DownTheAvenue wrote:
    ib516 wrote:
    It would be nice to know (from a reliable source like in this case) in which gears Ram and Ford limit output.


    Why? What you do with the information? What difference does it make?

    1. Because.
    2. I'd chisel it into the side of a mountain.
    3. It helps me pick my lotto numbers.


    LOVE IT!!!!!:B
  • ib516's avatar
    ib516
    Explorer II
    Jul 04, 2017
    DownTheAvenue wrote:
    ib516 wrote:
    It would be nice to know (from a reliable source like in this case) in which gears Ram and Ford limit output.


    Why? What you do with the information? What difference does it make?

    1. Because.
    2. I'd chisel it into the side of a mountain.
    3. It helps me pick my lotto numbers.
  • Tiger02's avatar
    Tiger02
    Explorer
    Jul 04, 2017
    Not much can be done with it, but still good to know from a consumer stand point. I see TM as a good thing to limit driveline wear. Of course there are cases when someone may want a modified tune to have that removed.
  • DownTheAvenue's avatar
    DownTheAvenue
    Explorer
    Jul 04, 2017
    ib516 wrote:
    It would be nice to know (from a reliable source like in this case) in which gears Ram and Ford limit output.


    Why? What you do with the information? What difference does it make?

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