Diesel Tuner's Blog

You bought a diesel truck because you value power, fuel economy, towing capabilities and long-term durability. However when it comes to modern diesel trucks, performance seekers often face a dilemma: how to enhance power and efficiency while keeping emissions systems intact. With increasing regulations and the desire for cleaner performance, finding a solution that strikes a balance is crucial. Enter Calibrated Power's Emissions In-Tact Custom Tuning—the ultimate upgrade for your diesel truck that ensures you get the best of both worlds.

Unleashing Hidden Potential Without Compromising Emissions

Calibrated Power's Emissions In-Tact Custom Tuning is specifically designed to optimize the performance of your diesel truck while keeping all emissions systems fully operational. This means you can enjoy improved power, torque, and fuel efficiency without the need to remove or tamper with your truck’s emissions equipment.

What crashes an LB7 and LLY ECMs?:

If you have a 2001 - 2004 (LB7) or 2004.5 - 2005 (LLY) Duramax and have been thinking about tuning it, this article is for you. 

As you're probably aware, ECMs have some small risk of crashing during a tuning flash.  Browsing the forums online you definitely already picked up on the fact that the LB7 and LLY ECMs are more suscepitble to the issue.

To make sure you aren't stuck stranded somewhere far from home follow these tips: 

• Disconnect all aftermarket electronics
• Make sure your batteries are at a full charge
• Flash your truck at home or a local garage

Essential 2004.5 and 2005 Duramax Upgrades

LLY is the code used for Duramax motors used in 2004.5 and 2005 HD trucks.  Although they introduced improvements from the 2001-2004 on the LB7 motor, there are a few essential upgrades every owner should consider.  (That is assuming an LLY owner would want more power, lower EGT's and better efficiency.)

Before diving into the pitfalls of an LLY, here are a few of the improvements brought to market when they were released.

• Injectors outside of the heads provided much easier replacement
• Improved injector design much more reliable than its predecessor 
• Variable Vane Turbo technology provides better spool up and wider power band
• Largest frame turbo of any Duramax motor to date

After years of testing this motor and countless upgrades, there are at least 5 essential upgrades every LLY could use.

• The LLY Duramax  is a great truck from the factory for there are 3 modifications every owner should make! The LLY was manufactured 2004.5 and 2005. There are a few 2006 models that are labeled as an LLY, however they have all of the LBZ upgrades from the factory, so for performance applications consider those an LBZ. An LLY was the first Duramax with the injectors outside of the heads, a variable vane turbo and a 50 state EGR.