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SMT-FTX Technical Manual - Tuning Airflow or Manifold Pressure #1

SMT-FTX TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT-FTX Unit.

TUNING AIRFLOW OR MANIFOLD PRESSURE #1

Airflow or manifold pressure are analogue signals, which is generated from a number of different types of sensors in the engine compartment; examples of these are the air flow meter, mass air flow meter (MAF) and pressure transducer (MAP) or temperature transducer.

 

PURPOSE

 

The OEM ECU signal input is ‘fooled’ to a different value from the actual. Thus the ECU will act differently and reduce/increase the fuel. The difference the SMT-FTX makes can be as simple as limiting the signal or mapping it at various operating points.

 

Most analog signals, with a few exceptions, range from 0 to 5 Volts and are used by the ECU to determine the fuel quantity. By routing the signal through the SMT-FTX the analog voltage is changed, which in turn results in a fuel change. Thus, allowing the car to be tuned. The input to output voltage relationship can be changed at various engine-operating points. This process is called “MAPPING”.

 

 

PROCESS

 

An ANALOGUE signal is intercepted, modified in the unit, and output. The signal can be any analogue voltage in the 0-5 Volt range. The modification is via three maps, namely ANALOG#1 MAP (TPS/RPM), AMP and Engine temperature map.

 

 

CONNECTIONS

Input AN1IN pin 2
Output A1OUT pin 12

 

 SMT-FTX Fuel Tuner - Analog #1 Wiring

FIGURE 4 ANALOG 1 WIRING

 

MAPS

SMT-FTX Fuel Tuner - F3 - Analog #1 Map

REQUIREMENTS

 

 

For Simple limiting and offsetting the outputs:

 


ANALOG #1 lower limit (Volts): Parameter, An1 upper Limit
This voltage setting prohibits the analog output to go BELOW the limit

 

ANALOG #1 high limit (Volts): Parameter, An1 lower Limit
This voltage setting prohibits the analog output to go ABOVE the limit

 

Analog #1 Offset (Volts): Parameter, An1 Zero Offset
This setting removes the electronic offset error, or it can be used to shift the map up or down.

SMT-FTX Fuel Tuner - ShiftF1 - Parameters

For mapping the signal:

 

  • Obtain RPM input, see: 7.0 OBTAINING RPM AND CALIBRATING IT
  • Obtain TPS input, see: 8.0 OBTAINING MAP DEFLECTION AND CALIBRATING IT
  • Obtain AMP input, see: 9.0 CONNECTING AMP AND CALIBRATING IT
  • Obtain Engine temperature input, see: 10.0 CONNECTING ENGINE TEMPERATURE
  • Entering values in to the maps

 

Map entry:

Main map and ENGT map entries are in counts (without a decimal point) 100 counts entry equals 1.00 Volts.

 

AMP map:
The entry is a multiplier. 1.00 puts the other map values on to the output without scaling.

 

 

COMPLETE CALCULATION

 

A1MOD=

ANA1 MAP
+- AN1 ENGT
X AN1 AMP

 

A1OUT = AN1IN +-A1MOD +-A1_Zero

The A1OUT signal is limited to the low and high limits.