H&S XRT Pro - 6.6 L LMM Duramax Calibration

1-888-628-1730 • XRT Pro Installation Manual 25
2007.52010 6.6L LMM DURAMAX USA / ULSD CALIBRATION
Power Levels
Power Levels can be adjusted on-the-y at the touch of a
button after Installing the Download to the vehicle. To adjust
the Power Level, select Change Power Level from the Main
Menu.
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 dierent rat-
ings and can be found at www.hsperformance.com/update-instructions.
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 adjust-
ed 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 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 dierent 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:
POWER LEVELS
Stock .................... 0 HP
Tow
.................... 40 HP
Street
................. 80 HP
Performance
.... 120 HP