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New tow vehicle configuration - am I missing anything important?

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  • #31
    Originally posted by Crespro View Post


    Hi Jim,

    I could not find the other quote, but here is the Ford manual. It seems that the computer does adjust the spark based on altitude, temperature, load and octane.

    I suspect the 430 HP rating by Ford was done on a 7.3 with premium gas, but that is a guess.

    Best,

    Charles

    FUEL QUALITY - GASOLINE
    Choosing the Right Fuel
    Your vehicle is designed to operate on regular unleaded gasoline with a minimum pump (R+M)/2 octane rating of 87. Some fuel stations, particularly those in high altitude areas, offer fuels posted as regular unleaded gasoline with an octane rating below 87. The use of these fuels could result in engine damage that will not be covered by the vehicle warranty. For best overall vehicle and engine performance, premium fuel with an octane rating of 91 or higher is recommended. The performance gained by using premium fuel is most noticeable in hot weather as well as other conditions, for example when towing a trailer. See Towing (page 272). Do not be concerned if the engine sometimes knocks lightly. However, if the engine knocks heavily while using fuel with the recommended octane rating, contact an authorized dealer to prevent any engine damage.
    We recommend Top Tier detergent gasolines, where available to help minimize engine deposits and maintain optimal vehicle and engine performance. For additional information, refer to www.toptiergas.com.
    Charles,

    This is the verbiage I've seen. As an engineer who worked in calibration, this language tells me that the truck is calibrated and certified to regular grade fuel since its advertised as such. Their strategy is revealed where they do not rely heavily on tables based on temperature to pull spark but rather rely on their knock control system. As a result, the ECU will only pull spark when knock occurs. And premium fuel has a higher knock index so high temperatures and heavy towing will deliver the same spark advance where premium fuel will lower the propensity of knock under those conditions.

    Based on this information, non towing and cooler weather will work best on regular grade fuel and will save you some coin and maintain the advertised fuel economy or close to that number.

    Jim

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    • #32
      Originally posted by MidwestCamper View Post

      Charles,

      This is the verbiage I've seen. As an engineer who worked in calibration, this language tells me that the truck is calibrated and certified to regular grade fuel since its advertised as such. Their strategy is revealed where they do not rely heavily on tables based on temperature to pull spark but rather rely on their knock control system. As a result, the ECU will only pull spark when knock occurs. And premium fuel has a higher knock index so high temperatures and heavy towing will deliver the same spark advance where premium fuel will lower the propensity of knock under those conditions.

      Based on this information, non towing and cooler weather will work best on regular grade fuel and will save you some coin and maintain the advertised fuel economy or close to that number.

      Jim
      Thanks, Jim. Good analysis of the ECU and engine.

      Charles

      P..S. Keith, pardon me for this thread detour. Hope this is helpful to others with the 7.3 gas engine.
      2021 Solitude 310 GK-R. 2020 F-250LB, 7.3L, 4.30, Reese 27K

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      • #33
        Originally posted by Crespro View Post

        Thanks, Jim. Good analysis of the ECU and engine.

        Charles

        P..S. Keith, pardon me for this thread detour. Hope this is helpful to others with the 7.3 gas engine.
        No Problem. I was very interested in the 7.3 Godzilla myself. Just don't think I would be totally happy with it for some reason even though my 5th wheel is well within its capability's

        Keith.
        2018 Reflection 150 Series 220RK 5th whee, Star White 2022 F350 King Ranch CC Long bed (HAL) (CCC 4062lbs), B&W 25K OEM Companion,. SteadyFast system, Trailer reverse lights, rear receiver spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, Solar, Custom 6K axles upgrade, and other modifications.

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        • #34
          Yoda Keith, My new Tow Vehicle (don't remember if I posted a pic of it):
          Click image for larger version

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          Joseph
          Tow
          Vehicle: 2024 GMC K3500 Denali Ultimate Diesel
          Coach: 303RLS Delivered March 5, 2021
          South of Houston Texas

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