38 Mini Maxx Installation Manual • www.hsperformance.com
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.
TPMS Adjustability / Disable
Many 2008 - 2010 6.4L Powerstrokes are equipped with a TPMS or Tire Pressure Monitoring
System from the factory. This system is designed to alert the driver of a problem with the
vehicles tire pressures but is often a nagging inconvenience for those individuals want-
ing to run lower pressures or get rid of the TPMS sensors altogether. H&S Performance
has a designed solution for those individuals. By using your H&S tuning device and a 6.4L
Powerstroke TPMS Adapter (Part #709913), you will have full control of the TPMS. Front and
rear tire pressures will be independently adjustable from 0 - 100 PSI as well as the option to
Disable the TPMS completely if removing the TPMS sensors from the vehicle. All changes to
the TPMS must be done with the 6.4L Powerstroke TPMS Adapter in place and the Adapter
must be removed after changes are made to resume normal tuner function.
Transmission Relearn
The 5R110 automatic transmission on the 2008 - 2010 6.4L Powerstroke has what is called
Adaptive Memory and is constantly learning and adapting to dierent horsepower levels,
temperatures, driving habits, etc. After completing the Install Download process on the 6.4L
Powerstroke, the Transmission Adaptive Memory is automatically reset. We highly recom-
mend performing a Transmission Relearn procedure after installing H&S tuning to help the
transmission perform correctly with the added horsepower. The 5R110 automatic trans-
mission 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 aect your vehicles traction or impair your visibility!
1. After H&S tuning is installed, perform each of the following 0-80 MPH runs while in the
Performance power level. During this relearn process, you may experience hesitation
during shifts, hard shifts, or defuel patterns, all of which are normal:
• 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.
2008 - 2010 6.4L Ford Powerstroke Specic Features Continued >>
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