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  • #16
    Originally posted by bertschb View Post

    Actually, most diesels reach max torque at low RPM's. For example, the 2020 Ford 6.7 Powerstroke reaches it's peak of 1,050lb-ft at 1,800rpm.
    Hi Brian,

    With reference to the torque curves attached to post 8 . . . the turbocharged gasoline Ecoboost reaches max WOT torque just past 2000 RPM . . . not that much different than your turbocharged diesel max torque RPM.

    Rob
    Cate & Rob
    (with Border Collies Molly & Angel + Kitties Hazel & Elsie)
    2015 Reflection 303RLS
    2022 F350 Diesel CC SB SRW Lariat
    Bayham, Ontario, Canada
    • Likes 1

    Comment

    • #17
      Hi Jim

      I've learned to avoid the gas vs. diesel debate :-)

      I was simply stating that max torque for diesels isn't at WOT.

      -Brian
      Brian & Kellie
      2020 Grand Design Solitude 310GK-R, FBP, MORryde IS, 1,460w solar and 540ah BBGC3
      2020 Ford F-350 Platinum SRW PSD Tremor, 60g TF fuel tank, Hensley BD3-F air bag hitch

      Previous setups:
      2019 Grand Design Solitude 373FB-R, 2019 Ford F-350 Platinum DRW Powerstroke, Hensley BD5 air bag hitch
      2016 Grand Design Reflection 318RST, 2016 GMC 3500 Denali SRW Duramax, Hensley BD3 air bag hitch
      • Likes 1

      Comment

      • #18
        Originally posted by bertschb View Post
        Hi Jim

        I've learned to avoid the gas vs. diesel debate :-)

        I was simply stating that max torque for diesels isn't at WOT.

        -Brian
        Brian,

        Are you confusing WOT with high RPM? I may be mistaken, max torque for any engine - gas or diesel - is at WOT... just at different RPMs.

        Rob
        Rob & Laura
        U.S. Army Retired (Rob)
        2012 F350 DRW CC Lariat PS 6.7, PullRite OE 18K
        2020 Solitude 310GK-R, MORryde IS and disc brakes, solar, BB LiFePO4, DP windows
        (Previously in a 2016 Reflection 337RLS)
        Full time since 08/2015

        Comment

        • #19
          WOT is "pedal to the metal" regardless of RPM or type of fuel. Max torque is at WOT. The value of that max torque depends on engine RPM. Usually a much higher RPM for gasoline over diesel . . . but, not necessarily so with turbocharged gasoline.

          Rob
          Last edited by Cate&Rob; 05-14-2020, 07:45 PM.
          Cate & Rob
          (with Border Collies Molly & Angel + Kitties Hazel & Elsie)
          2015 Reflection 303RLS
          2022 F350 Diesel CC SB SRW Lariat
          Bayham, Ontario, Canada

          Comment

          • #20
            Originally posted by Second Chance View Post

            Brian,

            Are you confusing WOT with high RPM? I may be mistaken, max torque for any engine - gas or diesel - is at WOT... just at different RPMs.

            Rob
            Well, it appears I must be confused if two different people are saying 1,800rpm's is WOT. I thought I could hit 1,800rpm's without flooring it. If I did floor it (WOT), max torque would hit at 1,800rpm on my way up to 4,000ish RPM's (not sure about max RPM on the 6.7).

            I've never gone WOT on any diesel truck I've owned but I've exceeded 1,800rpm on all of them.
            Brian & Kellie
            2020 Grand Design Solitude 310GK-R, FBP, MORryde IS, 1,460w solar and 540ah BBGC3
            2020 Ford F-350 Platinum SRW PSD Tremor, 60g TF fuel tank, Hensley BD3-F air bag hitch

            Previous setups:
            2019 Grand Design Solitude 373FB-R, 2019 Ford F-350 Platinum DRW Powerstroke, Hensley BD5 air bag hitch
            2016 Grand Design Reflection 318RST, 2016 GMC 3500 Denali SRW Duramax, Hensley BD3 air bag hitch

            Comment

            • #21
              Originally posted by Cate&Rob View Post
              Max torque is at WOT.
              So if I hit 1,800rpm (max torque) with 1/3 throttle (not WOT), how does this work? I'm very, very, very confused.
              Brian & Kellie
              2020 Grand Design Solitude 310GK-R, FBP, MORryde IS, 1,460w solar and 540ah BBGC3
              2020 Ford F-350 Platinum SRW PSD Tremor, 60g TF fuel tank, Hensley BD3-F air bag hitch

              Previous setups:
              2019 Grand Design Solitude 373FB-R, 2019 Ford F-350 Platinum DRW Powerstroke, Hensley BD5 air bag hitch
              2016 Grand Design Reflection 318RST, 2016 GMC 3500 Denali SRW Duramax, Hensley BD3 air bag hitch

              Comment

              • #22
                Originally posted by bertschb View Post
                Hi Jim

                I've learned to avoid the gas vs. diesel debate :-)

                I was simply stating that max torque for diesels isn't at WOT.

                -Brian
                No problem at all Brian,

                I like most all engines whether they are gas or diesel. For my next truck, I'm seriously thinking of the GM 3.0L diesel for a half ton option. The 30+ MPG (empty) is hard to ignore. Maximum torque on all engines is measured at WOT where its a function of airflow and boost in the case for the diesel. Max effort would be full throttle. Max RPM would be different where torque while flat on the diesel will still fall off at high RPM.

                Now some applications will torque manage at launch to maintain traction but the advertised torque would have been measured on an engine dyno where these functions would not apply.

                Jim
                Last edited by Guest; 05-14-2020, 07:56 PM.

                Comment

                • #23
                  Originally posted by bertschb View Post

                  So if I hit 1,800rpm (max torque) with 1/3 throttle (not WOT), how does this work? I'm very, very, very confused.
                  Just because you're at 1,800 RPM doesn't mean the engine is generating max torque. You could be cruising along on flat land at 1,800 RPM with 1/3 - 1/2 throttle and the engine isn't straining at all - nor producing anywhere near its max torque because it's not being given the fuel and air to generate the power. Max torque could occur if you're pulling a really steep grade and the engine is at 1,800 RPM and your right foot is all the way to the floor. In this case, the engine is working against a load and getting the maximum amount of fuel and air at the optimal RPM for its torque curve.

                  Rob
                  Rob & Laura
                  U.S. Army Retired (Rob)
                  2012 F350 DRW CC Lariat PS 6.7, PullRite OE 18K
                  2020 Solitude 310GK-R, MORryde IS and disc brakes, solar, BB LiFePO4, DP windows
                  (Previously in a 2016 Reflection 337RLS)
                  Full time since 08/2015

                  Comment

                  • #24
                    Originally posted by bertschb View Post

                    So if I hit 1,800rpm (max torque) with 1/3 throttle (not WOT), how does this work? I'm very, very, very confused.
                    Hi Brian,

                    There are many "part throttle" torque curves at far less throttle opening than "pedal to the metal". So, when you pull away from the light at 1/3 throttle pedal travel, the engine climbs to 1800 RPM and is generating a fraction of the power that it could (if you pushed the pedal to the floor) but this is sufficient to reach the acceleration rate that you require. I would guess that the torque created at 1/3 throttle is more-or-less 1/3 of max possible . . . or maybe 300 lb-ft. For me, this same acceleration away from the light would require 2/3 pedal depression to get 300 lb-ft of torque.

                    Rob
                    Cate & Rob
                    (with Border Collies Molly & Angel + Kitties Hazel & Elsie)
                    2015 Reflection 303RLS
                    2022 F350 Diesel CC SB SRW Lariat
                    Bayham, Ontario, Canada
                    • Likes 1

                    Comment

                    • #25
                      Originally posted by bertschb View Post

                      So if I hit 1,800rpm (max torque) with 1/3 throttle (not WOT), how does this work? I'm very, very, very confused.
                      Brian,

                      Are you observing torque with a dongle that plugs into the diagnostic port? If so, you are most likely looking at managed torque to maintain traction at WOT. You can turn traction control off but that's still not a guarantee at launch since torque can still be reduced for powertrain durability at launch. This is different than what the engine is capable of producing.
                      Also there is some turbo lag present where a load placed on the truck will allow time for boost to build at the lower RPM at WOT.

                      Jim
                      Last edited by Guest; 05-14-2020, 08:15 PM.

                      Comment

                      • #26
                        Just think how many beers we could consume around the campfire while discussing trucks and engines at the rally.

                        Jim
                        • Likes 1

                        Comment

                        • #27
                          I think I'll check out of this thread as I'm clearly showing my ignorance on this topic. I know some of you did this stuff for a living and unlike me, are actually qualified to speak on the subject.
                          Brian & Kellie
                          2020 Grand Design Solitude 310GK-R, FBP, MORryde IS, 1,460w solar and 540ah BBGC3
                          2020 Ford F-350 Platinum SRW PSD Tremor, 60g TF fuel tank, Hensley BD3-F air bag hitch

                          Previous setups:
                          2019 Grand Design Solitude 373FB-R, 2019 Ford F-350 Platinum DRW Powerstroke, Hensley BD5 air bag hitch
                          2016 Grand Design Reflection 318RST, 2016 GMC 3500 Denali SRW Duramax, Hensley BD3 air bag hitch

                          Comment

                          • #28
                            Originally posted by bertschb View Post
                            I think I'll check out of this thread as I'm clearly showing my ignorance on this topic. I know some of you did this stuff for a living and unlike me, are actually qualified to speak on the subject.
                            Don't be so hard on yourself, Brian. I think all of us enjoy a good discussion and, in the process, if we can help someone - even better!

                            Rob
                            Rob & Laura
                            U.S. Army Retired (Rob)
                            2012 F350 DRW CC Lariat PS 6.7, PullRite OE 18K
                            2020 Solitude 310GK-R, MORryde IS and disc brakes, solar, BB LiFePO4, DP windows
                            (Previously in a 2016 Reflection 337RLS)
                            Full time since 08/2015
                            • Likes 1

                            Comment

                            • #29
                              Originally posted by Second Chance View Post
                              Don't be so hard on yourself, Brian.
                              What bothers me Rob is when I share inaccurate information on a public forum - and correct people (sorry Jim) for being wrong when they aren't. I need to stick with what I know.
                              Brian & Kellie
                              2020 Grand Design Solitude 310GK-R, FBP, MORryde IS, 1,460w solar and 540ah BBGC3
                              2020 Ford F-350 Platinum SRW PSD Tremor, 60g TF fuel tank, Hensley BD3-F air bag hitch

                              Previous setups:
                              2019 Grand Design Solitude 373FB-R, 2019 Ford F-350 Platinum DRW Powerstroke, Hensley BD5 air bag hitch
                              2016 Grand Design Reflection 318RST, 2016 GMC 3500 Denali SRW Duramax, Hensley BD3 air bag hitch

                              Comment

                              • #30
                                Originally posted by MidwestCamper View Post
                                Just think how many beers we could consume around the campfire while discussing trucks and engines at the rally.

                                Jim
                                I don't think you have an understanding about modern diesels. There is no need for WOT. My truck makes its 800lbs of torque at 1600rpm and 400hp at 2800rpm.
                                2018 Reflection 315RLTS
                                2023 F350 Lariat 6.7L/CC/LB/FX4

                                Comment

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