6.6L LML Duramax Platform

2011-2016 LML Duramax

Here is a brief overview of the tuning available for the LML.

The 6.6L LML was the Duramax engine used from 2011-2016. It was the first Duramax to use DEF, in addition to the DPF and EGR systems, to aid in reducing the amount of emissions produced by the vehicle. As with most of these systems, there are a lot of issue, and replacement parts can be difficult to get.

The LML is capable of making roughly 530rwhp with just tuning. The stock CP4 fuel pump is the first limiter that the LML runs into. It is commonly replaced with the older CP3 that is more robust, and has less issues. 

Tuning for the LML can be done with EFILive, or Ez Lynk. Although the the base tuning is good on both platforms, the techs at MotorOps tend to prefer EFILive because it’s easier to modify the tuning if additional modifications are done to the truck. The maps are easier to work through to adjust the tuning as needed. That said, there is already a large list of profiles available on Ez Lynk for many different modification combinations. Ez Lynk also has a very simple flashing process. Using the Ez Lynk Auto Agent 3 plugged into your OBD2 port, you use an app on your smartphone to obtain your tunes, and flash them to the vehicle. It uses a cloud based system, so there is no physical file. This makes getting the tune files very quick, especially if you already have the programmer. EFILive on the other hand does use a physical file, which some people do prefer because they can save it to their computer. It’s not quite as quick and easy of a process, but there are detailed instructions for every step. Both platforms have a switchable tune and single tune option. The switchable tune uses a wired switch like the previous year Duramax’s.

Transmission tuning is available for all years of the LML. They come equipped with a 6 speed Allison Transmission. The tuning has the ability to adjust line pressure, shift pattern and timing, and torque converter lockup schedule. It helps to increase the holding capacity of the transmission, as well as match the shift pattern and torque converter lockup schedule to the new torque curve of the ECM tuning.