Ideal cruising RPM for MP8?

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

  1. jdchet

    jdchet Light Load Member

    270
    330
    Sep 3, 2012
    NE Ohio
    0
    Volvo D13/Mack MP8 also falls flat on it's face over 1750!
    Just sayin'..........

    JD
     
    Brettj3876 Thanks this.
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. jdchet

    jdchet Light Load Member

    270
    330
    Sep 3, 2012
    NE Ohio
    0
    True.......it's not going to come apart. But all the motor is doing up that high is making a lot of noise and less power!

    JD
     
    Brettj3876 Thanks this.
  4. Brettj3876

    Brettj3876 Road Train Member

    8,123
    33,639
    Nov 18, 2014
    Canceling cancel culture/CCC
    0
    I felt the same. We were pulling 100k frac pumps around pa/wv with 445 and 505hp. I was pretty impressed at the low rpm grunt. The ISX 12 liked a few more rpms
     
    JoeyJunk and God prefers Diesels Thank this.
  5. racemaxx24

    racemaxx24 Heavy Load Member

    713
    909
    Jul 4, 2014
    East TN
    0
    I drove a Mack with the MP8 505/1860 with iShift 12spd. 3.25 rears it was turning 1750rpm roughly 82-83mph. It came with lo pro 22.5s but had 11r22.5s at the time and the speedometer wasn’t recalibrated. I could get low 5’s MPG running 75ish. Obviously iShift a bit different gearing but for the “suggested” RPM on those motors it was a bit high. It ran and pulled like a scalded dog though lol
     
  6. racemaxx24

    racemaxx24 Heavy Load Member

    713
    909
    Jul 4, 2014
    East TN
    0
    For what it’s worth the Volvo I have now (D13 same engine) has 3.08s with the ishift, set at 455/1850 and I only get high 5’s/low 6’s with it. We usually run heavy and I idle every night though.
     
  7. Bdog

    Bdog Road Train Member

    1,052
    862
    Nov 6, 2014
    0
    I would be happy with high fives low sixes. Just completed a 2,000 mile trip, 65k gross, less than 30 minutes idling, averaged 4.4.
     
    racemaxx24 Thanks this.
  8. Atlanta trucker

    Atlanta trucker Road Train Member

    1,300
    1,409
    Jan 25, 2017
    0
    Your driving way to fast.
    Spend a week never going above 65 and I bet your mileage hits 6 mpg.
     
  9. Atlanta trucker

    Atlanta trucker Road Train Member

    1,300
    1,409
    Jan 25, 2017
    0
    You can't be making to much money ?
    What is your cost per mile for fuel ?
    You have got to be what .50 - .60 cents per mile on your fuel cost ?
     
  10. Atlanta trucker

    Atlanta trucker Road Train Member

    1,300
    1,409
    Jan 25, 2017
    0
    Your also running tall tires so that will lower your fuel mileage.
     
  11. Bdog

    Bdog Road Train Member

    1,052
    862
    Nov 6, 2014
    0
    That isn’t really an option. I travel everywhere in a convoy of pickups hauling our own equipment to our job sites. Everyone wants to travel the speed limit. With all the employees in the convoy on the road it is costing hundreds of dollars per hour in wages. The fuel savings by slowing down likely wouldn’t outweigh the additional labor cost of it taking longer to get places.
     
    Brettj3876 Thanks this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  • Draft saved Draft deleted