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Increasing hp from 455 to 475 or 500 on Volvo 670

Discussion in 'Ask An Owner Operator' started by Stillastudent, Oct 9, 2020.

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  1. Oct 9, 2020 #1
    Stillastudent

    Stillastudent Bobtail Member

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    Hello everyone! Im posting it on behalf of my old friend who is not very tech savvy. Can anyone be kind enough to share his/her experience or advise about increasing hp on a Volvo Semi? Friend's semi is 670, 455 hp, 3.36 rears with 600000 miles. Bought at 510000 miles. So far complete Def work, sensors, injectors, injector cups, alignment, steer axle kingpins done. Fitted with new tires, new shockers, new air bags but doesn't pull easy from a standstill or on small uphills even. Gives good mileage only if driven at 60-62 miles/hr. Consumes much more fuel if driven at 65. He hauls 72000-79000 lb.
    Would appreciate if anyone could guide and advice .
    Thank you very much for your time and attention.
     
    Stillastudent, Oct 9, 2020
    Stillastudent, Oct 9, 2020
    #1
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  3. Oct 9, 2020 #2
    TexasKGB

    TexasKGB Light Load Member

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    Nothing is going “to pull” with that rear ratio. Your buddy bought a flat land reefer hauler for heavy work.
     
    TexasKGB, Oct 9, 2020
    TexasKGB, Oct 9, 2020
    #2
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  4. Oct 9, 2020 #3
    TexasKGB

    TexasKGB Light Load Member

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    Also, what engine?

    If it’s the 13 more horses won’t do anything but accelerate wear to engine and transmission.

    If it’s the 16 or ISX it may have some sort of fleet programming. The engine isn’t the limitation, though. It’s the rear ratio.
     
    TexasKGB, Oct 9, 2020
    TexasKGB, Oct 9, 2020
    #3
    Stillastudent Thanks this.
  5. Oct 9, 2020 #4
    Ridgeline

    Ridgeline Road Train Member

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    What was the rated vs. actual horsepower when it was on the dyno?
     
    Ridgeline, Oct 9, 2020
    Ridgeline, Oct 9, 2020
    #4
    Stillastudent Thanks this.
  7. Oct 9, 2020 #5
    86scotty

    86scotty Road Train Member

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    Volvo dealer can increase hp with software, nothing mechanical. They are the only ones that can do it so far as I know amd will only increase it to what they will warranty. For my 15 780 (d13) that was 425 to 500. It was a fleet truck for 500k at 425.

    Cost me about a grand.
     
    86scotty, Oct 9, 2020
    86scotty, Oct 9, 2020
    #5
    Dave_in_AZ, Stillastudent and Brettj3876 Thank this.
  8. Oct 9, 2020 #6
    Socal Xpress

    Socal Xpress Road Train Member

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    If you are on FB join Volvo Truck Masters. Couple of options are available depending on location.
     
    Socal Xpress, Oct 9, 2020
    Socal Xpress, Oct 9, 2020
    #6
    86scotty and Stillastudent Thank this.
  9. Oct 9, 2020 #7
    Socal Xpress

    Socal Xpress Road Train Member

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    455hp sounds like an XE package. Is the truck I-shift?
     
    Socal Xpress, Oct 9, 2020
    Socal Xpress, Oct 9, 2020
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  10. Oct 10, 2020 #8
    Brettj3876

    Brettj3876 Road Train Member

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    Your 500 is it 1850 or 1750? Fuel mileage go up?
     
    Brettj3876, Oct 10, 2020
    Brettj3876, Oct 10, 2020
    #8
  11. Oct 12, 2020 #9
    Stillastudent

    Stillastudent Bobtail Member

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    Dec 20, 2019
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    It is D13
     
    Stillastudent, Oct 12, 2020
    Stillastudent, Oct 12, 2020
    #9
  12. Oct 12, 2020 #10
    Stillastudent

    Stillastudent Bobtail Member

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    Dec 20, 2019
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    Yes, it is ishift. I don't know if it is XE.
     
    Stillastudent, Oct 12, 2020
    Stillastudent, Oct 12, 2020
    #10
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