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New Cummins ISX15 550 HP.

Discussion in 'Canadian Truckers Forum' started by james1974, Dec 31, 2012.

  1. Dec 31, 2012 #1
    james1974

    james1974 Bobtail Member

    9
    2
    Dec 30, 2012
    0
    Hi guys, I am new to this site, and i am not sure where I should be posting this question. I just got moved into a 2012 KW c500 tri drive with a Cummins isx15, it has a 18 speed with a 4 speed aux transmission .I have not seen any torque charts for this engine and i am new to Cummins [off of a truck with a Detroit series 60].The engine pulls good down low and i am wondering if I am doing damage to my tranny by pulling down to 1150 rpm in the hills, keep in mind that i am pulling a 24 low with a booster so I am usually at the 90,000-100,000 kg weight range. Also I don't care about fuel economy, so what is the best rpm for pulling heavy loads with this engine? Thanks for any input that I get.
     
    james1974, Dec 31, 2012
    james1974, Dec 31, 2012
    #1
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  3. Dec 31, 2012 #2
    TheYoungBuck

    TheYoungBuck Light Load Member

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    Feb 6, 2012
    Lacombe, AB
    0
    Same setup as my truck, except mines only a tandem and no a-box.

    I've pulled a few heavy coil tubing spools(60k) and keep it 13-1500 range.

    Found this as well:
     
    TheYoungBuck, Dec 31, 2012
    TheYoungBuck, Dec 31, 2012
    #2
    james1974 Thanks this.
  4. Dec 31, 2012 #3
    Stn4Cap

    Stn4Cap Bobtail Member

    40
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    May 23, 2011
    Eastern Ontario
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    Showoff!!

    just kidding, Happy New Year!!
     
    Stn4Cap, Dec 31, 2012
    Stn4Cap, Dec 31, 2012
    #3
  5. Dec 31, 2012 #4
    nate980

    nate980 Road Train Member

    2,020
    5,221
    Dec 23, 2010
    Langley BC
    0
    Yea I usually don't let it get below 1200
     
    nate980, Dec 31, 2012
    nate980, Dec 31, 2012
    #4
    james1974 Thanks this.
  7. Dec 31, 2012 #5
    Prairie Boy

    Prairie Boy Road Train Member

    3,258
    1,912
    Nov 18, 2010
    Edmonton, AB
    0
    Max torque is 2,050.

    I would also say that the sweet spot is 1200 - 1400 and I would think that the max HP is at 2100. Which I would use the high RPMs to get moving or on a hard pull climbing a hill or mud up to your ying yang.
     
    Prairie Boy, Dec 31, 2012
    Prairie Boy, Dec 31, 2012
    #5
    james1974 Thanks this.
  8. Jan 1, 2013 #6
    Pinner

    Pinner Medium Load Member

    410
    201
    Feb 14, 2010
    B.C.
    0
    I use the same engine, they don't pull anywhere near as good as the older ones. Not sure what you call a hill, 100,000 kgs. @ 1150 rpm...

    IMO your completely wasting your time bogging down to 1150 rpm. Pulling a hill @ 100,000 kg. you should be downshifting @ 15-1600 at the latest. Peak torque at at 1200 rpm or something doesn't mean a lot as the torque curve is probably pretty flat after that. Horsepower plays a huge role in power. Torque plus horsepower equals power. Horsepower comes at high revs and with a fairly flat torque curve, the engine makes more power at a higher rpm.

    Those truckers that gear their trucks to run down the road at peak torque are hauling ping pong balls and lawn furniture, any real weight requires power and power comes with higher revs. Sure torque gets a load up a hill, that torque comes from your drive line, the engine makes the power and the transmission/diffs converts it to torque. Now I must go pull some hills, Hudson's Hope to Boundary Lake :)
     
    Pinner, Jan 1, 2013
    Pinner, Jan 1, 2013
    #6
    james1974 Thanks this.
  9. Jan 1, 2013 #7
    james1974

    james1974 Bobtail Member

    9
    2
    Dec 30, 2012
    0
    My truck is geared to run at 1600 rpm on the hi way and the engine does good at 1500-1650 range when i accelerate, but as soon as I start up a hill at those rpm's it has no holding power at all. The engine does not start to hold until the rpm's drop under 1400. I could just keep dropping gears and use the mechanical torque advantage that I get in the lower gears, but if I am not hurting the trans I figure why not use the engine the way that Cummins engineers designed it to operate. I only have 35,000 km on the engine now, so I am hoping that after 70,000 or so km it will loosen up some.
     
    james1974, Jan 1, 2013
    james1974, Jan 1, 2013
    #7
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