1-888-628-1730 • XRT Pro Installation Manual 27
2011-2014 6.6l lMl DUraMaX
Usa / UlsD caliBraTion
Power levels
Power levels are not currently shift-on-the-fly for the
2011 - 2014 6.6L LML Duramax. To adjust the Power Level,
select
change Power level
from the Main Menu and follow
the on-screen instructions
(this may change so be sure to visit
www.hsperformance.com for product updates)
.
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 and can be found at www.hsperformance.com/update-instructions.
speed limiter
This option allows for the removal of the factory speed limiter. Most 6.6L LML Duramax
trucks have a 98 MPH speed limiter from the factory. This option can only be changed 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 addition, 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 2011 - 2014 6.6L LML 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 at-
tempt 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!
1. After you have installed the H&S tuning, turn the key to the ON position. From the Main
Power LeveLs
Tow
. . . . . . . . . . . . . . . . . . . .
40 HP
Street
. . . . . . . . . . . . . . . . .
80 HP
