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2005 DURAMAX DIESEL TUNER ??

Discussion in 'Off Topic Threads' started by THALL, Aug 21, 2013.

  1. THALL

    THALL Member

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    I have a 2005 GMC 3500HD with about 140,000 miles that I use as a daily driver and to tow my 40' toyhauler. I am seeking guidance on a diesel tuner that will help with a little more power & fuel economy. I am not trying to drag race this truck, just help it along. Thanks in advance for your experience. Tim Hall
     
  2. dlwdogs

    dlwdogs TS Member

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    I have a 2005 2500 Duramax. I have tried several different tuners on several different trucks. The cheaper ones will do basically what most of what the high dollar ones will do. You will get more power, but what you need to remember is that the tuner changes what you see on the displays in your vehicle. An example of this would be you are seeing 15 mpg now without a tuner and you add a tuner you see 20 mpg what you see is false information. The only way I found this out is by doing simple math. The only way you will know your true miles that you are getting is miles divided by gallons. Next you need to know is when you change the fuel mixtures with a tuner your EGT Exhaust Gas Temperatures change and will go up do to the increased fuel. You can melt a piston real quick. You will get more power and think you are getting better fuel but what you will get is real problems real quick if you are not careful. My tuner is turned up one step. I also have a gauge that tells me the EGT , Oil Temperatures and boost where I can monitor all of these things. I got my best MPG without the tuner. I use it because it gives a little extra power pulling my fifth wheel. dw
     
  3. flashmax

    flashmax Well-Known Member

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    As dw said my 2005 Duramax did better, power AND fuel use, without add ons. If you replace the fuel filter religiously and wash out your K&N air filter ( you do have an aftermarket air filter, right? ) every 20 - 25 K miles and run a fuel system cleaner through the tank every oil change to keep hen-peckers clean and unclogged you will have done good work. Use quality oil, like Rotella, and make sure that after your 140 K miles the air passages through the front side ( Radiator, Air - Air Intercooler, Oil cooler, Transmission oil cooler ) are clear. You may or may not need to do a transmission oil filter change. If you have changed the spin-on every 25 - 50 K miles you can probably get by waiting until 200 K miles for the big change but if you have been towing a lot and haven't changed the spin-on since the initial change at 15 K miles you need to do a full filter and fluid change out in the Allison. Do that and you will get both better fuel miles and better feeling power. One flaw in the Allison was that it needs TLC in heavy/prolonged tow situations and could both overheat and deteriorate badly. I did all the above and was still getting 20 to 25 MPG unloaded round trip from Denver to Kansas City to visit my son at Leavenworth CGSC before he went to trashcanistan. Traded the old girl off last September at 240 K miles and the new truck is only slightly better on power and not even as good in the cosmetic department.

    The Duramax, even pulling a 32 ft 5th Wheel at highway speeds, gets better fuel miles than did my 1977 Marmon Road Tractor with the big Detroit Diesel 8v92 pulling Wheat or other Ag products all over the USA. Managed to coax a Fleet Leading 5.8 MPG out of it over a full year in 1978 after my discharge from the military and my dad's disabling crash out by Mineola KS. Put 2.4 Million miles on that Marmon and it is still in service at one of the 'Corporate Farm' operations in Pawnee County Kansas.

    Just one of my punched tickets in the JOAT race.

    Don T
     
  4. Catpower

    Catpower Molon Labe TS Supporters

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    It is nice to hear some honest replies

    I have some friends that have their trucks chipped, all different makes and they tell me how great the mileage is, but when we have gone on trips together they have to stop more often that I do for fuel, but they always have some excuse, that they are heavier loaded, not or some other BS

    I do have a friend that chipped his Cat Challenger, I told him he was nuts, but he never listens and it did really boost the power

    But it is in the shop getting a new rear end and transmission in it, he is not sure how much it is going to run, but it is way up there

    He is unchipping it
     
  5. THALL

    THALL Member

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    Thank you for all of the sage advice. I routinely change the oil filter & air filters. The fuel filter is changed on every other oil filter change. The transmission filter is monitored & changed as needed. Shoot well! Tim Hall
     
  6. moowho

    moowho Member

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    Wisconsin
    I have 5inch exhaust, EFI Live,After market air cleaner kit & down tube from turbo and Bat wheel in turbo. 25 mpg all day long. Also run a pyro & boost gauges
     
  7. ljutic73

    ljutic73 Well-Known Member

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    My pal who is a GM Master Tech and is the Duramax/Allison specialist in his shop says the biggest mistake most Duramax (or any other diesel pickup owner for that matter) make is not adding extra trans cooling along with their power tuning upgrades.

    Ron Burr
     
  8. noknock1

    noknock1 Active Member

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    I have an '03 so I don't have the 6 speed allison. I tow a 10,500 pound travel trailer. I have pulled approximately 6000 miles so far and can tell a real difference with a 4" exhaust, & PPE Tuner, and S&B cold air kit. As stated above, a pyro gauge is a must.

    My fuel mileage on my last trip from Indiana to Gulf Shores through the decent grade hills along I-65 resulted in 10.5 MPG. That is with pen and paper, the truck says that I got 14 something mpg. Multiple decent tuners according to the diesel heads on various GM diesel forums.

    EFI Live is the top of the line! I couldn't spend that much money to go for custom tunes, etc. So I went with the PPE standard tuner and keep it on #2 tow tune even for daily driving.

    So do your own research and google what do you have? An <i> LLY 2005 PPE Tuner</i> for example and start reading. Regardless, once you add a tuner you won't ever want to go back stock.
     
  9. TD1958

    TD1958 Member

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    There are a lot of tuners available and to say buying an off the shelf tuner will increase both your power and fuel mileage would be some what of a lie. If you truly want the best of both worlds, have a custom tuner either ride with you with there laptop attached so they have all your parameter's and driving habits on paper and then let them burn a tune. I guarantee you will not be unhappy. These diesel trucks with good tuning are all capable of mid to high 20's in fuel economy. Good luck, Tim
     
  10. noknock1

    noknock1 Active Member

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    TD1958 is right, I got more power with the PPE Tuner, but fuel mileage is about the same with a minimal increase in MPG.

    However, assuming you are out of warranty and not in a state wear emissions are regulated then an EGR delete kit is a must to fully exploit the HP potential of your duramax regardless of tuner selection.

    Again EFI Live is the best with custom tunes, but it comes with a substantial cost.
     
  11. white rattler

    white rattler Member

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    Tim, the best way to get a lot more power is to trade your truck in on a new Ford you will then have all the power you will ever need. Trevor Dawe.
     
  12. noknock1

    noknock1 Active Member

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  13. Argentina

    Argentina TS Member

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    What you should really do is to sell the Duramax ..... get off your wallet and buy a SportChassis with the Cummins / Allison combination ... your asking a boy to do a mans job with that Duramax.


    :)
     
  14. TD1958

    TD1958 Member

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    White rattler, I drive a ford and it's not anew one. I have a six litre with all the mistakes both ford and international couldn't bring themselves to admit fixed. Trust me I know what power and fuel economy are. Thanks for the advice though. Tim
     
  15. noknock1

    noknock1 Active Member

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    Five minutes into this video is where Cummins owners start crying. LOL...
     
  16. JT 27

    JT 27 Member

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    While I have a Ford, I would offer my experiences. I had a Banks system on my motor home (gas) that really helped so I looked at their diesel systems. I later found a hot rod diesel shop. I went to them and told them the same thing you are looking for, no race truck, reliability, better towing performance. What I got was exactly what I wanted. Better milage and performance, they recommended a larger less restricted exhaust and air filter system but not a chip replacement. Check your area for a diesel performance shop, I am convinced they know the best way to help the engines work. Dealerships will seldom do anything that would violate the warranty, which seems to be any modification.
     
  17. build4u

    build4u Member

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    Bully Dawg is the one. Call them and talk to tech. I have used thier tuner in Chevrolet Duramax in 2004,2006 and currently in my 2008. I ran more of a performance tune in the 04 and 06 but not real hot and still gained mileage. They do not reccomend that tune for heavy towing above a certain weight or in heavy mountains. In my 2008 I am running the economy/tow tune. I have never had any issues with anything on my Duramax Allison combination with or without the power upgrade. The Bully dawg lets you adjust for tire size, leave the speed limiter on or off, and run diagnostics.

    I wont get into the brand dispute however I have owned 24 trucks so far not counting the ones my company owns, and most of my tradesman drive trucks and I am a one brand man now.
     
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