What is the REAL maximum HP/Torque that can be put to a RTLO16913A ?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Guntoter, Mar 12, 2018.

  1. Guntoter

    Guntoter Road Train Member

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    I can't find any info from any real source, I know... I know... 2050 pounds of torque, bla bla bla... I hear trucker stories about blowing up transmissions but right now I'm at 2800 pounds of torque (725 HP) to the ground and haven't had any issues with heat or anything else. Im at about 50K miles on the motor so far and ready to bump up my tune (still running the "break-in" tune). My question is, does anyone have experience with 3200 pounds and 900 HP using a stock transmission and rears? If so, were there any issues and what gear oil do you run, how often do you change it, do you run any coolers etc? BTW, Im in Phoenix AZ (hottest place on earth and we're in a valley so everything is up hill).
    BTW, I was told by a guy who has built dozens of 13/18 speeds that the guts are mostly the same (with a few minor exceptions) in 13 and 18 speeds. He said the 18 speed is not really any stronger than a 13 in high range. Is that true?
     
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  3. swaan

    swaan Road Train Member

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    I guess you'l find out soon enough.
     
  4. benjamin260_6

    benjamin260_6 Medium Load Member

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    I seriously doubt that you're making that much torque with only 725hp...but that being said, the big boys racing in Quebec are running about 5400# of torque through these transmissions. They're only getting a weekend or 2 of racing out of them before they bend and break but you've got a long way to go and you have to drive it pretty hard before you'll be doing the damage that they're doing.
     
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  5. BoxCarKidd

    BoxCarKidd Road Train Member

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    I have never had the privilege of that kind of power. On transmissions shock is usually a larger problem than running them at higher than rated torque. Study up on your transmission and know where to run it. As in do you know what gears are direct in the front and back box. If you can run direct when really pushing it the trans can stand a lot more. Also are there any weak areas in that model to avoid under high load? 50W synthetic and the cooler the better.
    Can we see a picture of that bad boy getting it done?
     
    Last edited: Mar 12, 2018
  6. SmokinCAT

    SmokinCAT Road Train Member

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    I really question how you came up that 725hp comes out to 2800ft-lbs.

    It takes north of 4 digits to get over 3000ft-lbs, and if you do have a setup like that and lug it you should probably not be behind the wheel with that much power.
     
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  7. Guntoter

    Guntoter Road Train Member

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    Since two people said 725 HP doesn't add up with 2800 pounds of torque, I'll address that... The dyno guy at Kenworth in Phoenix showed the instant hp and torque numbers (peak) and I was shocked because torque was 5500 and change! WOW! He laughed and said "thats because we pull numbers from both rears" I had to divide by two (I'm not very experienced with dyno tuning big trucks). So, the reason I said 2800 was I just divided the 55xx pounds by two. If thats not the correct way to do it, please explain.
     
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  8. SmokinCAT

    SmokinCAT Road Train Member

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    No, you divide the wheel torque by the rear differential ratio, and even the that doesn’t take into account driveline loss.
     
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  9. SmokinCAT

    SmokinCAT Road Train Member

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    My good friends C18 put out 10160ft-lbs at the tires and was never pulled down to where torque would have peaked.

    His truck has 3.55s so without driveline loss figured in that comes to around 2860 at the crank, this is on an engine that made 1138hp.
     
  10. Guntoter

    Guntoter Road Train Member

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    Not much to show ( I run in California so no smoke ) but I tried to make it purdy. Screen Shot 2018-03-13 at 7.50.55 AM.png
     
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  11. Guntoter

    Guntoter Road Train Member

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    So, 550divided by 3.36?
    So, 5500 divided by 3.36? Thats only 1600 pounds, my truck absolutely runs away from stock 550 HP Cummins all day long. I mean when they're doing 30 MPH up Sunset Point grade out of PHX, I'm doing 55 MPH... So you're telling me that I run almost twice as fast as a stock Cummins and I've only got 1600 pounds of torque?
     
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