12.7 detroit upgrades

Discussion in 'Trucks [ Eighteen Wheelers ]' started by prerunner404, Jun 21, 2016.

  1. Tractor-trailer

    Tractor-trailer Bobtail Member

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    Nov 30, 2018
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  3. Freightliner Classic

    Freightliner Classic Light Load Member

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    Dec 17, 2018
    Rome GA
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    About to do a inframe on a 12.7 new Injectors,turbo,and mainifold any one got any ideas on how to get some extra HP
     
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  5. benjamin260_6

    benjamin260_6 Medium Load Member

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    Aug 8, 2012
    Ontario, Canada
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    What's you engine serial number?
     
  6. Freightliner Classic

    Freightliner Classic Light Load Member

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    Dec 17, 2018
    Rome GA
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    benjamin260_6 dont have them right on hand
     
  7. Freightliner Classic

    Freightliner Classic Light Load Member

    108
    95
    Dec 17, 2018
    Rome GA
    0
  8. benjamin260_6

    benjamin260_6 Medium Load Member

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    Aug 8, 2012
    Ontario, Canada
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    I managed to figure that out when you said it was a 12.7. There's lots of different models though and some will easily take 600+ on a tune while other shouldn't go over 600hp because they won't take it very long. Also, knowing how much power you want and how much you're willing to spend would help
     
  9. Robledo84

    Robledo84 Bobtail Member

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    Dec 18, 2018
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    Have a stock 12.7 DDEC 3 96 having trouble running against air can’t get past 50-55 loaded with 84k was thinking of changing out turbo to borg Warner would that help any suggestions?
     
  10. 12.7Power

    12.7Power Bobtail Member

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    Feb 10, 2019
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    Looks like it’s getting the job done right.
     
  11. '07 KW w/53' Conestoga

    '07 KW w/53' Conestoga Medium Load Member

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    Sep 28, 2015
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    Wow, that sounds worse than what I had! I bought a 96 Intl Eagle w/12.7 in Jan 2018, right away noticed, NO power climbing even the smallest hills.

    Took it to the Diesel Dr in Effingham, IL. I had taken my ISX to them a number of years ago, had heard great things about them.

    Turns out, my 12.7 was set to a stock tune producing a meager 430/430 HP and 1,450 Ftlb torque. For $300, they replaced it with a 550 HP that produces 1,850 Ftlb torque! Amazing what a difference it made.

    The suggested going to a Borg Warner turbo and a ceramic manifold, I don't recall if it was Detroit's or someone else...telse...thelse...telse...they quoted me $3,800 (incl labor) to do both, I thought that wasn't a bad deal since I paid over $5k to replace a blown VGT
    (and steam the CAC) on the ISX 4 or 5 years ago. Maybe VGT are pricy? I dunno.

    Anyway, I am finding info in this post EXTREMELY helpful.

    Right now, I am having my mech swap out rears. Truck has over 1.5 million MI and, I think they are original 3.90. We are going to go with a 3.42 ratio.

    Right now, with 24.5 LP tires and a 13 speed, I turn just under 1,700 RPM at 70MPH which is about the fastest I like to cruise. The 3.42 should drop me just under 1,500 which, hopefully, will improve fuel economy and reduce a bit of wear on the motor.

    My fuel economy is bad, around 5-5.5. I try to ease my way up to speed. I don't have a fairing on the roof, my sleeper is a standup but, is more like a mid-rise. But, I can't imagine a fairing really boosting economy much. I think rears, turbo, manifold, injectors, fuel pump, maybe even a Bully Dog HDGT will matter more.

    I also have another mechanic adjacent to where I park who is pushing a $1,500 BG fuel injector treatment. The process takes 3 or 4 hours and requires oil/filter change when done...my motor has about 250k MI on it...I just can't imagine the injectors are THAT dirty. They also recommend the filter and pump system that takes air bubbles out of the fuel...I forget the name, there are 2 big ones who compete, father/son inventors...that's another $1,500-$2k plus additional filters to maintain.

    Anyhow, good luck to you, let us know what you end up doing and your experience.
     
  12. biofumes

    biofumes Light Load Member

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    Feb 13, 2009
    California
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    You ever want to know what type engine you have, look at your engine model number. If your engine has the BK60 on it, You've got yourself the premium model, which can handle the 550hp tunes.

    detroit models.jpg
     
    Willmann30 Thanks this.
  13. ChicagoJohn

    ChicagoJohn Road Train Member

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    Jan 14, 2016
    Chicago
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    Skip the injector cleaning BS. Run 2 quarts of atf in each tank when you fill up or try this before you spend all the money. It's like $30/gal and I used one for each tank. A06951B8-0396-4C5C-A2DC-31944791F6A5.jpeg

    The Borg Warner is a great turbo I just installed a new one last year. (First one had the main band snap and it messed up the bearings) I have the ceramic manifold, it was already installed when I bought the truck. I'm not 100% sure it's worth the money, but if yours is bad then it's worth upgrading.

    Dropping to 3.42 rears will make a difference. I run them and I turn 1500 at 70, but I have 295 22.5 tires. I believe the 12.7 loves the 1500 range and with a Borg turbo it should have plenty of power and boost. (I push around 34-35 lbs at 1500 rpm) One thing I would suggest is if you do the turbo, change out the blue boots for the red ones, they can handle the extra heat and pressure better. I've blown 2 blue boots before my mechanic suggested the stronger ones. (I'm referring to the ones between the turbo and CAC)
     
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