2008-2010 6.6L GM Duramax LMM
Click each option for details:
Power Levels
Default Power Levels
Power Levels
DPF Removed
- Stock HP
- Mild: 60 HP
- Wild: 120 HP
- Hot: 175 HP
Power Levels
DPF Present
- Stock HP
- Mild: 40 HP
- Wild: 80 HP
- Hot: 120 HP
Power Levels can be adjusted on-the-fly at the touch of a button after Installing the Download to the vehicle. The current Power Level will be saved even if the Mini Maxx is unplugged.
Note: The Power Level ratings listed may not be exact for your particular vehicle. The listed ratings apply to the out-of-the-box tuning that H&S tuning devices are shipped with. Any custom downloads may result in different ratings.
Custom Power Levels
Custom
Power Levels
Power Levels
Easy Tuning
- Stock HP
- Mild: 40 HP
- Wild: 80 HP
- Hot: 120 HP
Custom Tuning Power Levels Available for Download
Easy Tuning
Emissions
DPF Selection
The DPF or Diesel Particulate Filter is part of the factory exhaust system on the 6.6L LMM Duramax. H&S offers tuning that allows the DPF to be left in place, or removed completely.
If you are planning on leaving the exhaust system stock with the DPF in place, you will select PRESENT.
If you have already removed the DPF or if you plan on removing the DPF immediately after installing your H&S tuning device, you will select REMOVED. If you select REMOVED, you must Accept our DPF Disclaimer in order to continue with the Install Download process.
If you are planning on leaving the exhaust system stock with the DPF in place, you will select PRESENT.
If you have already removed the DPF or if you plan on removing the DPF immediately after installing your H&S tuning device, you will select REMOVED. If you select REMOVED, you must Accept our DPF Disclaimer in order to continue with the Install Download process.
DPF / Exhaust Sensors
When running DPF PRESENT tuning, it is required that all sensors located in the exhaust system stay in place and plugged in, otherwise you may experience a Check Engine Light (CEL) and even a loss of power (limp mode).
When running DPF REMOVED tuning, it is recommended that all sensors located in the factory exhaust system be unplugged from the electrical harnesses. These sensors can also be removed completely with the factory exhaust if desired. On the 6.6L LMM Duramax, there are usually 2 EGT Sensors and 1 Pressure Sensor.
When running DPF REMOVED tuning, it is recommended that all sensors located in the factory exhaust system be unplugged from the electrical harnesses. These sensors can also be removed completely with the factory exhaust if desired. On the 6.6L LMM Duramax, there are usually 2 EGT Sensors and 1 Pressure Sensor.
EGR Unplug / Delete
When running H&S DPF REMOVED tuning, it is not required to unplug or block-off the EGR system on your 6.6L LMM Duramax to disable it. The EGR system is already disabled in the tuning and will not function under any conditions. If desired, the entire EGR system can be unplugged, blocked-off, or completely removed when running H&S DPF REMOVED tuning.
Speed Limiter
This option allows for the adjustment of the factory speed limiter. Most 6.6L LMM Duramax trucks have a 98 MPH speed limiter from the factory. The limiter can be adjusted from 50 MPH to 95 MPH or removed completely. This option can only be adjusted during the Install Download process.
Tire Size Calibration
This option allows for the re-calibration of the factory speedometer to adjust for non-stock sized tires. For the most accurate speedometer reading when using non-stock sized tires, it is best to measure the diameter of the tire using a tape measure rather than going by the printed tire size. In additon, using a GPS is a great way to dial in your factory speedometer. Entering a larger tire size will cause the factory speedometer to read higher while entering a smaller tire size will cause the factory speedometer to read lower. The tire size can be adjusted from 25” to 60”. This option can only be adjusted during the Install Download process.
Note: On some vehicles, entering a tire size larger than 35” may cause the ABS light to illuminate.
Transmission Tuning
Transmission Reset / Relearn
The automatic transmission on the 2007.5 – 2010 6.6L LMM Duramax has what is called Adaptive Memory and is constantly learning and adapting to different horsepower levels, temperatures, driving habits, etc. We highly recommend performing a Transmission Reset / Relearn procedure after installing H&S tuning to help the transmission perform correctly with the added horsepower. The transmission will eventually learn over time on its own, but the relearn procedure gives a good baseline for the adaptive learning and helps to speed up the learning process. To perform the relearn procedure, please follow these instructions:
When re-training the transmission, ALWAYS follow posted speed limits. Do NOT attempt runs in adverse weather conditions such as snow, ice, rain, wind, or any other conditions that may affect your vehicles traction or impair your visibility!
When re-training the transmission, ALWAYS follow posted speed limits. Do NOT attempt runs in adverse weather conditions such as snow, ice, rain, wind, or any other conditions that may affect your vehicles traction or impair your visibility!
- After you have installed the H&S tuning, turn the key to the ON position. From the Main Menu, scroll down until you see the Reset Transmission option. Select Reset Transmission and follow the on-screen instructions to reset the transmission adaptive memory.
- After the transmission reset is complete, it is recommended to perform each of the following 0-80 MPH runs while in the HOT power level:
- 0-80 MPH @ 25% throttle position, then slow down and come to a complete stop.
- 0-80 MPH @ 50% throttle position, then slow down and come to a complete stop.
- 0-80 MPH @ 100% throttle position, then slow down and come to a complete stop.
The Transmission Relearn procedure is complete.
Note: On any vehicle using 3” or larger lift blocks under the rear leaf pack, it is HIGHLY RECOMMENDED to install traction bars when adding additional horsepower.
Available Gauges to Monitor (PID’s)
- Current Power Level
- Transmission Gear Position
- Torque Converter Status
- Pyro 1
- Pyro 2
- Speed
- Boost Pressure
- Engine RPM
- Coolant Temperature
- Throttle Percentage
- Intake Air Temperature
- Barometric Pressure
- Fuel Rail Pressure (ICP)
- Transmission Temperature (Auto)
- Load Percentage
Accessories / Recommended Products
