Making more HP in a Cummins M11

Discussion in 'Trucks [ Eighteen Wheelers ]' started by xkmail, Apr 26, 2007.

  1. KO1927

    KO1927 Medium Load Member

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    May 19, 2009
    NH
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    Fast. Cheap. Reliable.

    Pick two.

    Or so I've been told.
     
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  3. kuerro990

    kuerro990 Bobtail Member

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    Jun 25, 2010
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    Like how mutch it $$$$ for that update??? will a cummings deler do it?
     
  4. earthmover

    earthmover Medium Load Member

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    Jan 27, 2009
    castalia , north carolina
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    my 97 freightliner dump has 280/1050 and i get 6.7/7 mpg with 4.11 i would love to turn my truck up to the 330/1250 if i could get the more mpg also i have a 9speed ...what mpg did you get before you trned it up .....also i was told cummins is the only 1 that will not sell there prog. not sure but when i had my ecm replaced thats what i was told... i paid 179.00 for the program
     
  5. AUSSIE DAVE

    AUSSIE DAVE Road Train Member

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    Feb 21, 2010
    OZ - Brisbane
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    I believe that some m11 do not have oil galleries in the conrods and because of this they can not handle the high HP, (also the stiffner plate issue) I also believe that the suitable m11 can safely be taken up to 450hp . ISM are 285 to 450 HP
     
  6. kah68

    kah68 Bobtail Member

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    Nov 28, 2006
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    earth mover, if you are asking me I don't know what the mileage was pre-up rate as I did it as soon as I bought it, sounds like my truck is exactly the same as yours, (Penske?) I would love to swap that gappy 9 speed for a 13 to get more usable power in the top side of the tranny. I agree with post above, if you need more than 1450 might as well look for a 15L, JMO.
     
  7. earthmover

    earthmover Medium Load Member

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    Jan 27, 2009
    castalia , north carolina
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    so yours is still going strong i take it... i may look into doing my dump next year..thanks
     
  8. kah68

    kah68 Bobtail Member

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    Nov 28, 2006
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    Old thread, but has anyone gone further than 370 without issue? I really only want the 1350 rating but I might swap out to a 10 speed first.
     
  9. gunner76

    gunner76 Medium Load Member

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    Mar 11, 2010
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    My dads old truck, which we still have as a backup, is a 330 M11 that was taken up to either 400 or 425 by the previous owner. We bought the truck with 590k on it and it now has 1.2 million on it and the only thing we've done to the engine was the rods and mains at 900k, an aircompressor, and a couple of injectors. This truck has a super 10 and pulls really well. We pulled a bullrack and a hopper with it so it was worked hard.
     
  10. Rockets07

    Rockets07 Bobtail Member

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    Nov 18, 2011
    Brisbane Australia
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    any update on horsepower upgrades on the 330E M11....i want to put mine out as far as it will go safely...i am always pulling weights of 43500 ton and it is coupled up to an 18 speed eatons box....i believe the ECM reprogramme will make this happen. Just out of intrest to you Cummins fans, the old M11 in my 401 Kenworth has done close to 2.4 million klms and has had 2 rebuilds, however she is getting sad and a second hand replacement is going into her in a few weeks time. So if anyone can reboot this thread it would be great
     
  11. Mortifis

    Mortifis Bobtail Member

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    Mar 31, 2012
    Portland, OR
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    Okay so this thread a a bit old .. he's one thing to consider. The M11 has a range of power ratings. Before you go and 'turn it up' first call the deal or a qualified parts place and what the original rating is using the CPL xxxx example CPL 1856 ... what makes a turn up safe is the Consolodated Parts List which defines what type of cams, lifters are in there .. plus ... here's the cruicial part ... what transmission model is in there? The power rating a torque specific so any ol M11 can be software upgraded to 500 HP but if the transmission is 1250 torque at 1200 rpm you'll burn it out with any HP over 400.... also, when an ECM is programmed you need to specify the CPL, Tramsission model and rears ratio ... almost any M11 can be safely bumped to 375 ...just something to think about
     
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