SMART TUNER SMT8 - FUEL TUNING VIA AFM OR MAP
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Perfect Power Application Notes. |
Application Note - AN 1.1 |
Introduction
This application note describes the methods of tuning the air fuel ratio of the engine via the Air Flow Meter or MAP sensor.Purpose
SMT8 Analog Wiring

SMT8 Analog Setup

The Analog voltage has three parameters in the "Shift F1" map, they are the "An1 Upper Limit", "An1 Lower Limit" voltages and the "Analog#1 Offset %" percentage. The Upper limit clamps the maximum voltage that would be return to the OEM ECU, this works the same for the Lower Limit. The offset percentage will increase or decrease the entire Analog #1 map, so if the engine is too rich across the complete rev range then there would be a negative value entered to lean the engine out.
SMT8 Analog Mapping

Testing if you have control of the fueling is simply done by entering a large number into the green cell in the main map during idle and confirming that the engine's pitch changes. The mapping calculation is as follows :
A1OUT | = | AN1IN |
+- ANA1 MAP | ||
+- AN1 ENGT | ||
+- AN1 AIRT | ||
X AN1 AMP |
Conclusion