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SMT-FTX Technical Manual - Obtaining Map Deflection and Calibrating It

SMT-FTX TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT-FTX Unit.

OBTAINING MAP DEFLECTION AND CALIBRATING IT

The map deflection should be a signal which describes the engine load. The following signals can be used:

 

  • TPS    Throttle Position Sensor
  • AMP    Absolute Manifold Pressure

 

Whichever you choose, connect the 0-5V signal to TPSIN, pin 4.

SMT-FTX Fuel Tuner - TPS Steps

CONNECTING AMP AND CALIBRATING IT

 

The AMP signal is required because it describes the load of the engine. Connect the 0-5 volt signal to AMPIN, pin 3

SMT-FTX Fuel Tuner - ShiftF4 - AMP Calibration

The Amp sensor is calibrated so the full range of the sensor gets used. By that I mean a normally aspirated engine will go to a maximum pressure of 1 bar at sea level. So your upper scale shouldn’t be more than 1 bar. With the amp connected and the ignition key on, the sensor should generate a voltage; this is displayed in the “Present Input volts”. The voltage represents the atmospheric pressure. The example is setup for a sensor to display the atmospheric pressure of 0.84; the voltage displayed was 1.50 volts this voltage was entered into the “High Calibration” volts, the position 20 was used to allow the unit to calculate the values up to 1 bar. The “Low Calibration” scale can be entered as displayed.

 

 

CONNECTING ENGINE TEMPERATURE AND CALIBRATING IT

 

Connect the Engine Temperature signal to ENGTIN, pin 5.

SMT-FTX Fuel Tuner - ShiftF5 - Engine Temperature Calibration

This sensor must be calibrated so the unit can be mapped to compensate for cold and hot conditions. With the ignition key on the displayed voltage would be entered into the “High Calibration” this voltage into the upper calibration point. When the sensor cools down it will have a lower voltage. You need to put in an educated guess as to the lowest temperature the engine will experience and what voltage this will be into the lower calibration point.