2004.5 - 2005 GM 6.6L LLY Duramax | Engine Tuning by PPEI.
2004.5 - 2005 GM 6.6L LLY Duramax | Engine Tuning by PPEI.

2004.5 - 2005 GM 6.6L LLY Duramax | Engine Tuning by PPEI

PP-LLY-ET

Elevate your 2004.5 - 2005 LLY Duramax to new limits with PPEI's Engine Calibration, an industry-leading performance enhancement that will transform your truck's capabilities. PPEI's Engine Calibrations have been meticulously crafted to unleash the full potential of your LLY Duramax, providing a significant performance boost of up to an additional 230 HP directly to the wheels.

But the advantages of PPEI's tuning go far beyond raw horsepower. These calibrations redefine your vehicle’s performance by enhancing throttle response, increasing acceleration, minimizing turbo lag, and delivering an all-around refined engine performance. With a focus on optimal efficiency, PPEI's Engine Calibrations are engineered to reduce excessive fuel consumption, thus improving overall fuel efficiency. This means you can enjoy increased power without sacrificing fuel economy.

One of the standout features of our LLY Duramax Engine Calibration is the remarkable impact on towing capabilities. Your truck will effortlessly tow heavy loads with increased confidence and ease, making your towing experiences smoother and more efficient.

For the ultimate performance experience, we highly recommend pairing PPEI's Engine Calibrations with PPEI's Transmission Calibration. This combination promises the BEST and most advanced engine and transmission tuning available for your LLY Duramax. With PPEI Engine and Transmission Calibrations, you can expect significant improvements in your truck's shift strategy, eliminating the frustrating gear-hunting when towing. Additionally, the Transmission Tuning will enhance downshifts and up-shifts based on throttle input, ensuring your LLY Duramax always operates within its most efficient power range, preventing engine strain and inefficient fuel consumption.

Key advantages of PPEI’s Engine tuning for your LLY Duramax:

Increased Horsepower: Achieve up to 230 horsepower, a significant boost over the stock engine's output.

Improved Acceleration: Enhance your vehicle's acceleration capabilities for quicker and more responsive performance.

Reduced Fuel Consumption: Optimize fuel efficiency to reduce excess fuel consumption, saving money and improving the overall performance of your LLY Duramax.

Reduced Turbo Lag: Minimize turbo lag, ensuring power is delivered smoothly and consistently, especially at lower RPMs.

Decreased Soot Output: PPEI’s refined calibrations are designed to reduce soot output while maximizing efficiency.

Enhanced Throttle Response: Improve the vehicle's throttle response, resulting in a more immediate and precise reaction to driver input.

However, it's essential to consider the capacity of your transmission. If your 2004.5 - 2005 LLY Duramax is equipped with stock transmission components, it is recommended not to exceed an additional 120 HP over the stock horsepower. Pushing beyond this limit with a stock transmission can result in premature transmission failure. Here are the available PPEI Engine Power Levels for stock transmissions:

STOCK TRANS

  • Level 1: +15 HP
  • Level 2: +30 HP
  • Level 3: +60 HP
  • Level 4: +100 HP
  • Level 5: +120 HP

For LLY Duramax trucks equipped with built transmission components, the possibilities are even more exciting. These robust transmissions can handle power levels exceeding 120 additional HP without issue. Here are the available PPEI Engine Power Levels for trucks with built transmissions:

BUILT TRANS

  • Level 1: +30 HP
  • Level 2: +60 HP
  • Level 3: +100 HP
  • Level 4: +160 HP
  • Level 5: +230 HP

Experience the Difference: Choose PPEI's Engine Calibration for your 2004.5 - 2005 LLY Duramax and transform your truck into a more powerful, efficient, and responsive vehicle. It's not just an upgrade; it's redefining the limits of your truck and driving experience.

Installation & Compatibility: To install the tuning for your 2004.5 - 2005 LLY Duramax, you'll need EFILive Hardware & Software. Compatible EFILive Hardware options include EFILive AutoCal V2/V3 and EFILive FlashScan V2/V3.

To complete your transformation into a high-performance machine, we recommend adding Banks Power Ram-Air Cold Air Intakes and FASS Fuel Systems lift pump. These products, in conjunction with PPEI's Engine Calibrations, will bring your LLY Duramax to its most efficient self, ensuring you experience the power and efficiency you deserve. You will find more info regarding the products that PPEI recommends below.

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Who is the tuner/calibrator

PPEI, also known as Power Performance Enterprises, Inc., is led by the business owner and lead calibrator/tuner Kory Willis. PPEI began calibrating/tuning back in 2008, specializing in Diesel Performance but has since expanded into the Gas and Powersports industries. Kory and the team at PPEI have set many world records along with continuing many industry “firsts.” We take pride in knowing that Kory not only prides his work but also thoroughly enjoys setting expectations high for our team so our customers can have the best products and service in the world.

What does PPEI’s tuning do for my LLY Duramax

  • Tuning is intended to increase the horsepower (hp) and torque (tq) the engine can produce. OEM manufacturers, like GM, show vehicle hp and tq based on the amount of power produced by the engine, at the engine, which is 310 hp and 605 lb-ft of torque. 
  • PPEI, unlike the OEM, measures hp and tq at the wheel. What does that mean? – It means PPEI measures power that the vehicle produces to the ground showing the amount of powertrain loss from the engine, through the transmission, to the wheels. PPEI refers to this as the “baseline,” in this case, for the LLY Duramax, we measured 265-wheel hp and 510-wheel tq. The baseline shows a powertrain loss of 45 hp and 95 lb-ft of tq. 
  • PPEI’s primary focus when tuning or creating a calibration is focusing on the overall efficiency. Many individuals search for the most horsepower & torque and view it as the “best tuning,” however, more times than not, it’s quite the opposite. Many tuners advertise tuning based on the highest hp & tq, surpassing the threshold of efficiency. When the threshold of efficiency is overpowered, issues start showing up, which can be as minor as poor fuel economy or as significant as transmission and engine failure.
  • At PPEI, we love our performance, but we develop all calibrations around reliability, giving you peace of mind no matter the situation. Whether you’re at the dragstrip or hauling a heavy trailer across the nation, PPEI’s LLY calibrations redefine the limits and safely go beyond the OEM’s performance. 
  • PPEI’s LLY calibrations may produce up to an additional 230-wheel horsepower above the OEM baseline. PPEI’s LLY performance calibration brings the overall horsepower up to just shy of 500-wheel hp and 800 lb-ft of torque. Furthermore, PPEI offers a seamless method to change between 5 different power levels (tunes).



The PPEI stock trans engine calibrations are designed specifically for trucks that are utilizing a stock transmission to ensure the user can't push the vehicle beyond limitations of the stock transmission. These calibrations are engineered to provide you the most efficient power and performance without exceeding the threshold of efficiency while maintaining reliability. PPEI has thoroughly tested and refined each power level to give you the best tuning in the world for your Duramax. The PPEI built trans engine calibrations follow the same idea with the exception that the built trans engine calibrations are designed only for trucks with upgraded or modified transmissions allowing the truck to support more power safely. 


Power Level 1: Economy +15/30 RWHP

This power level is designed to reduce lag and improve throttle response for optimal efficiency. 


Power Level 2: Heavy Tow +30/60 RWHP

This power level is designed for towing anything over 15,000 lbs. Do not use any power level higher than power level 2 for towing loads that exceed 15k lbs as this will surpass the stock engine and stock transmissions threshold of efficiency which increases the chance of mechanical failure and decreases overall reliability of your vehicle.


 Power Level 3: All Purpose +60/100 RWHP

This power level is designed for towing anything under 15,000 lbs or daily driving. This power level is what we at PPEI recommend for everyday use as it boost overall all performance while retaining  reliability. 


 Power Level 4: Street +100/160 RWHP

This power level is designed for daily driving but has a little spice to make things interesting while keeping your Duramax safe and reliable without pushing the factory components beyond their abilities. The street calibration packs a punch that it doesn't come with from the factory. This calibration is not intended to be used for towing as it could surpass the threshold of efficiency.


  Power Level 5: Performance +120/230 RWHP

This power levels development process specifically derived for the purpose of giving you a wow sensation when you press the peddle. Obviously, the wow-factor doesn’t exist from the factory as the LLY is kind of boring and rightfully so. At PPEI, we thoroughly enjoy pushing vehicles to their limits and finding the weak link, which is why the aftermarket industry for hard parts exists. Without knowing the weak link, the automotive performance industry would be throwing darts blindfolded. This calibration is specifically designed to be used a ¼ mile at a time. PPEI highly recommends that you do not tow at all or daily drive in this calibration as it pushes the limits surpassing the efficiency threshold of the factory components.

Air Filtration and why it is necessary to upgrade your stock air filtration system


PPEI Recommends the Banks Ram-Air System as it outflows the stock intake design by 57% while inhaling cold air and lowering Intake Air Temps, reducing EGTs and minimizing soot output, making for the most efficient air filtration system available. Black smoke or soot is a visual representation of loss of power or wasted HP as the engine is not efficiently burning the fuel. By installing the Banks Power Ram-Air System, you are only improving the overall efficiency of your engine while extending the engine’s life and enhancing your fuel efficiency at the same time. Black smoke = wasted power and inefficient tuning. Here is a list of benefits when using the Banks Ram-Air Cold Air Intake System. Gain +39HP and +69lb-ft of torque with the Banks Ram-Air Cold Air Intake system. 

  • Enclosed housing keeps out hot, power-robbing engine air

  • Horsepower gain up to +39 hp and +69 lb-ft of torque

  • Optional Super-Scoop rams cold air for more power

  • Extends service life and requires fewer cleanings

  • Inhales cooler outside air for more power & MPG

  • Reduces exhaust gas temps (EGTs) and smoke

  • Outflows stock and competitors up to 35%

  • Giant filter maximizes high-flow filtration

  • Accommodates engine movement

  • Prevents component damage

  • Helps engine run cooler

  • 5-year Limited Warranty

  • OILED Air Filter Element

Fuel Filtration Upgrades and why it is so important for the LLY Duramax


PPEI also specifically recommends FASS Fuel Systems for all PPEI Tuned application, especially the 6.6L Duramax platform. A stock Duramax doesn’t come equipped with a lift pump (a fuel pump that assist fuel from the tank to the injection pump). The Duramax engine relies solely on the injection pump to pull fuel from the tank and supply that same fuel to the injectors causing it to do more work creating unnecessary stress on the CP3 injection pump. FASS which stands for Fuel Air Separation System includes the following benefits:


  • Preset 8-10 PSI Fuel Pressure
  • Removes Water, Air and Debris From Diesel Fuel
  • 2 Micron Filtration Rating
  • Protects and Extends The Life Of Your Injectors
  • Improved Cold Weather Starts
  • Decreases Carbon Monoxide and Carbon Dioxide Emissions
  • Fuel Mileage Improvement
  • Improved Fuel Volume Delivery
  • Smoother Engine Idle
  • Optional Electric Heater Ports
  • Optional Fuel Pressure Gauge Port
  • Limited Lifetime Warranty
  • 1,000,000 Mile Motor
  • 30,000 Mile Filter Life


Customer Reviews

Based on 11 reviews
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David Gerken
2005 LLY

I have a basically bone stock LLY and after coming from a newer 6.7 Cummins was underwhelmed by the towing performance and lack of exhaust brake function. The team at PPEI was super helpful and set me up with a dsp5 switch and tunes as well as an autocal. They even enabled the exhaust brake function in both tow tunes per my request. After the tuning process failed using the Autocal, they offered to bench tune the ECM and did so with incredible speed in turnaround. Got my ECM back and installed and the truck runs amazing now. Throttle seems smoother, truck runs much better and I’m looking forward to the first tow to test out the exhaust brake function. 100% would recommend PPEI!

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Gary Hupp
2005 LLY 130k miles

I got this tune (engine, TCM, 5pos switch, and auto Cal V3) a couple weeks before leaving on a 3500 mile road trip with my dually and 4k lb truck camper. I ran into some snags during the install and probably annoyed the shit out of Ryan and Zach trying to get it figured out but after a couple days of back and forth, they got it done. On these LLY's, don't expect it to be an easy 15 minute project, but be assured that these guys will help you out. We're in the middle of our trip and so far it's been performing flawlessly. I have only kept it on the light tow setting (#3), and very noticeable power and response difference. The whole setup is 12k lbs and it climbed through the Smokies at 70 mph like nothing. So far, 2.5k miles into our trip and it's money well spent.

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John JENNINGS
Clean tunes.

My lly zf6 truck had the ppe accelerator tuner on it. It was not the cleanest running truck on the road at all. Now that I have ppei tunes the truck runs cleaner and pulls harder in all 5 tunes compared to the old box tuner. The truck also has a 9 blade rds turbo that was needing tuned properly, now the turbo isn't no where as loud as it used to be at idle. Ppei has some of the best customer service in the market.
Thank you PPEI.

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Vincent Kruyf
04.5 LLY +60hp

My LLY is a completely different truck after I got it tuned by PPEI. Runs so much better and is way more efficient. Customer service is the best I have ever experienced. Even since I am from overseas.

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Garett Townsend
60 HP LLY Tune

Bought the 60 HP tune for my 04.5 LLY. Good tune and great customer service. I had some trouble getting my tune to load. Ryan jumped in and got it done. Thanks guys

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WHO IS THE TUNER/CALIBRATOR

PPEI, also known as Power Performance Enterprises, Inc., is led by the business owner and lead calibrator/tuner Kory Willis. PPEI began calibrating/tuning back in 2008, specializing in Diesel Performance but has since expanded into the Gas and Powersports industries. Kory and the team at PPEI have set many world records along with continuing many industry “firsts”. We take pride in knowing that Kory not only prides his work, but also thoroughly enjoys setting expectations high for our team so our customers can have the best products available in the world.