Ideal cruising RPM for MP8?

Discussion in 'Experienced Truckers' Advice' started by Bdog, Feb 4, 2021.

  1. Ridgeline

    Ridgeline Road Train Member

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    Actually it is an option, slow down to 65 on a 1250 mile trip (for example) compared to 78 is three hours. Let the idiots in the pickups go there own speed.
     
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  3. Atlanta trucker

    Atlanta trucker Road Train Member

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    So your either in construction or farming ?
    I worked construction as a driver for a little while but coming from the trucking industry I was very concerned about fuel cost. I talked to my company about it and they really were not concerned about it so I did not worry about.
    Are you a company driver ? If so ask your company if they even monitor it ?
     
  4. AModelCat

    AModelCat Road Train Member

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    Or leave ahead of the pickups and let them play catch up.
     
  5. mitmaks

    mitmaks Road Train Member

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    Keep it under 1500rpm and cruise 65mph and under and ull see 5mpg
     
  6. KB3MMX

    KB3MMX Road Train Member

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    Bingo.
    100%
     
  7. KB3MMX

    KB3MMX Road Train Member

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    None of the XE spec or XE-TC motors... Not at all.
     
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  8. Brettj3876

    Brettj3876 Road Train Member

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    I haven't driven the XE/HE the mack/volvo was 1st gen DEF model. 2010-11

    Whatever they call mp8 445C, would fall flat right around there 1250-1300 with a 100k frac pump.
     
  9. KB3MMX

    KB3MMX Road Train Member

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    It won't come apart it can sit there all day.

    Consequences are much higher fuel consumption and substantially decreased engine life from accelerated engine wear.

    Peak TQ in a diesel is a measure of engine efficiency.

    A lengthy discussion ..but the longest engine life is peak Tq and slightly above , operation at peak HP or above is the shortest engine life and least efficiency.
     
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  10. Brettj3876

    Brettj3876 Road Train Member

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    What do these new super low rpm engines run for oil psi down at 1100?
     
  11. AModelCat

    AModelCat Road Train Member

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    So many threads on here from drivers freaking out because the tach hit 2100 lol.
     
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