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  1. #31
    Light Load Member DD14's Avatar
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    The injector codes some are talking about are "injector calibration codes" they are stamped on the injector.They are used to equalize the injectors performance from one to another. Changing all the codes to some magic number does little if anything for the engines horse power.If set correctly with the code stamped on the injector the engine should run smoothly.


  2. #32
    Road Train Member stranger's Avatar
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    Changing the code on a 12.7 does not do much, but it will make a big difference on a 11.1. I have owned two, set both, and noticed a difference before I left the driveway.

    Changing the setting really woke up the take off and lower rpm torque. Throttle response was changed dramatically also.

    The 12.7 I owned, I changed the injectors, set the codes to each injector as stamped on the injector, then tweaked each with a laptop until each cylinder had an even response with the injector cut out, and idle smoothness.

    A trigger happy tech changed the codes to .75 when I was having some work done without my knowing it. I only found out about a few weeks later it when I decided to look at the ECM print out he gave me. The difference on this engine was so little I could not tell a difference. It could have been because this engine was a 1550 ft lb engine to begin with instead of 1450 ft lb.

  3. #33
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    i can get a backdoor password for u i need the engine serial number it usually starts with 06ro then 6 numbers

  4. The Following User Says Thank You to fordwheeler100 For This Useful Post:


  5. #34
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    I need to know if there is software I can get for my laptop to change HP setting etc on my 14l ddec IV

    or am I stuck having to deal with the dealership?

  6. #35
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    Quote Originally Posted by stranger View Post
    The HP of the 12.7 Detroit doesn't make as much difference as the torque setting. Most are set at 1350-1450 ft.lbs.

    If you have a 1550 ft.lb. rated transmission and driveline, then the software can be upgraded to 1550 ft.lbs. and you will tell a huge difference in the engine.

    One thing different about the power between the 12.7 (DEDC III & IV) Detroit and a Cat, the Detroit will fall on its face from 1450 rpm on down. From 1500 to 1650 you will have the most HP and torque combo. With the engine you are looking at having 470 HP, you should have good pulling all the way up to 1800.

    1,000,000 miles should be attainable easy if you have a good engine that has not been abused. The front bull gear will sometimes go out, but a regular oil analysis will tell you if something is going on. The assessory drive bearings will usually go after 600k, but this is easy, and realitively cheap to fix.

    As with any engine, fuel mileage is good if driven right, better than Cat and Cummins in most cases. My KW had a 12.7 with 375-450 HP setting, and 1550 ft.lbs. torque. The 450 HP setting would only kick in when using the cruise. I never needed the higher HP. I ran at the lower end of the best HP/torque band. My truck had the mileage display in the dash, which I calibrated to make it almost exactly what the calculator would come up with.

    I still have the mileage and gallons divided out to the third decimel in MPG for every fillup from the day I bought the truck until I sold it. I got better mileage at 71 MPH than 66. I checked it too many times. I could watch the dash indicator start going up as soon as I hit 70.

    I was specked with 22.5 low profile tires, 3.70 rears, super 10 transmission, and the 12.7, 370-450,HP, 1550 torque engine. I ran with an almost identical truck pulling the same load in very hilly country. The only difference is his KW had a 435-E Cat. Same tires, transmission and rears, and he could not stay in sight of me. So if a Detroit is set right and driven right, they are good engines.

    One thing you can do to help low end greatly, if you can't set your engine to 1550 torque, is to get someone to plug into your ECM and set the injector response time on all injectors at .75. This will wake up a Detroit, especially an 11.1 engine.

    You can take an 11.1, set the ECM to 400 HP, calibrate the injector response to .75, and drill out the fuel restrictor at the back of the head to no larger that .090, and it will run with most trucks on all but the biggest of hills, and still get around 7 mpg or better.

    I hope this helps some.
    I have an 11.1 det & was told I could not get 400 h.p. I can have 350 h.p. # 2100rpm's or 365h.p. # 1850 rpm's. so I have 365 h.p. williams detroit hooked up to my truck, something about not able to burn the e.c.m on my engine.

  7. #36
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    i had 12.7 detroit in my 96 pete and i had a good luck with it...i sold it with 1.4millions and change ....never had a problem ...and dont be shy rev it up up to 1900rpm i didnt hurt anything in mine for 5 years....

  8. #37
    Road Train Member stranger's Avatar
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    There is a 400 HP, 2100 RPM, 1350 ft lb torque program for the 11.1 engine. I had one, and a friend of mine with an identical truck got the same program at a different location. Most dealers don't know about it. Insist that they call Detroit HQ to get the facts. My truck was originally a 330 HP, so it can be done.

    The torque may have been 1450. I can't remember right now.

  9. #38
    Road Train Member ironeagle2006's Avatar
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    I loved being a test truck for the 14 liter 60 series in the late 90's. Company I was with all we had except for 20 cat po wered trucks that we all hated SUCKED on MPG even in a Century class well we got 10 testers with 14 liters. I got one here were the restrictions NO GOVERNORS considering that we normally were cut off at 65 hey we were happy. Every month had to get the computer reporgrammed to a higher power level to see what that sucker would do. At the end I had 620 and 2050 ftlbs they never came out with that however because of the EPA. Even running like a pizza man being chased by Oprah at the Weight Watchers convention the dang things still got 7 MPG going down the road.

  10. #39
    "Don Cheto" Big Duker's Avatar
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    Quote Originally Posted by ironeagle2006 View Post
    Even running like a pizza man being chased by Oprah at the Weight Watchers convention the dang things still got 7 MPG going down the road.
    Now that is one fast truck to stay ahead of that chug bu tt.

  11. #40
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    Quote Originally Posted by danc694u View Post
    About that long, less if it's a large fleet truck.



    No it won't. Unless it's got a DD15 in it.



    I won't say it doesn't. But, I've never been able to get it. I've always gotten 6.5 and higher in a Cat or Cummins. Around 6 or less in a Detroit.


    I would buy one of theirs, before I bought anyone else's.


    Strong point -- Service bays located everywhere.
    Weak Point -- You'll need every one of them.

    Many a Detroit has spun a lower bearing due to "low" idle speeds. So you bump it up when idling. The newer ones are much better though.
    and what rpm is considered a good idle speed?

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