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SMT8_4 Technical Manual - Map Switching

SMT8_4 TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT8 V4 Unit.

MAP SWITCHING

The SMT8_4 comes with two entirely separate tune maps in memory. We call them map “A” and map “B”. The LETRIPP Software displays the present map in the upper right hand corner or in the STATUS display. Two maps are used for:

 

  • Performance versus Economy
  • Tested versus untested
  • Normal versus high altitude
  • Good fuel versus bad fuel
  • Weather

 

NOTE: Please make sure that you have a valid tune map in map “B” before you flip the switch.

SMT8V4 Piggy-Back Unit - Map Switching

The two tune maps can be invoked by:

 

 

MECHANICAL SWITCH

 

There is an option to connect (pin 8/12) an external mechanical switch to the SMT8_4 to enable it to do map switching. Without this mechanical external switch, the unit will default on power up to Map A (open pin). Should the mechanical switch be installed, the unit will power up and run on the map selected. The transition between maps switching is seamless and can be performed while the vehicle is in operation, provided both maps are loaded.

 

SMT8V4 Piggy-Back Unit - Wiring Diagram for Mechanical Switch

WIRING DIAGRAM FOR MECHANICAL SWITCH

 

 

SOFTWARE MAP SWITCH

 

The tuning software can also change the Selected Map, regardless of what the external mechanical switch is presently set to. However, as soon as the unit is reset or is powered up, the SMT8_4 will revert back to the external mechanical switch setting. By changing the software map switch, the unit will switch maps, even while the vehicle is in use. The PC FREEZES the selected map and renders any other map-switching mute.

SMT8V4 Piggy-Back Unit - Map Switching

AUTOMATIC SWITCHING

 

The SETPOINT feature can switch the operating maps. This is done from the FUNCTION level. A FALSE evaluation selects map A. Mechanical map switching will no longer function

 

For this feature to work the following items must be set:

  • Enable SYSDEF, SETPOINT MAP SWITCHING ENABLED
  • Set Any of the SETPOINT features FUNCTION, ENABLE MAP SWITCHING

SMT8V4 Piggy-Back Unit - Automatic Map Switching