H&S Mini Maxx Installation Manual - Speed Limiter

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Speed limiter

This option allows for the adjustment of the factory speed limiter. Most 6.7L Powerstroke 

trucks have a 98 MPH speed limiter from the factory. The limiter can be changed to 75 MPH 

or removed completely 

(this may change so be sure to visit www.hsperformance.com for product updates)

. 

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 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 enter-

ing a smaller tire size will cause the factory speedometer to read lower. The tire size can be 

adjusted from 31” to 34” 

(this may change so be sure to visit www.hsperformance.com for product updates)

. 

This option only takes a few seconds to change and can be adjusted at any time from the 

Tire Size Calibration menu.

TPMS adjustability / Disable

Many 2011 - 2012 6.7L 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 wanting to 

run lower pressures or get rid of the TPMS sensors altogether.

With your H&S tuning device, you have full control of the TPMS. Front and rear tire pressures 

are independently adjustable from 0-120 PSI as well as the option to disable the TPMS com-

pletely if removing the TPMS sensors from the vehicle. This option only takes a few seconds 

to change and can be adjusted at any time from the Tire Pressure Calibration menu.

nOTE: 

TPMS adjustments will not take full effect on a stationary vehicle. Once adjustments have been made, it can 

take up to 5 miles of driving before changes take effect.

Transmission Tuning

Did you know that your H&S tuning device also has the capability of tuning your transmis-

sion? Our transmission tuning for the 6R140 automatic transmission is custom tailored to 

mate with H&S engine tuning. Some features include: boosted line pressures, modified full 

and part throttle lock/unlock strategies, adjusted full and part throttle shift points, adjusted 

full and part throttle shift firmness, and modified torque management tables. All changes