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SMT-FTX Technical Manual - Tuning Narrow Band AFR (Lambda)

SMT-FTX TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT-FTX Unit.

TUNING NARROW BAND AFR (LAMBDA)

The purpose of the AFR (Lambda) modification channel is to change the AFR reading the OEM ECU receives from an exhaust sensor. This in turn affects the ECU fuel loop. Thus AFR tuning becomes a powerful tool for fuel.

The input NAFRIN pin 9 and output NAFROUT pin 13 are shared between:

 

  • NARROW BAND MODIFICATIONS and
  • ANALOGUE #2 MODIFICATIONS

 

To select Narrow band AFR modifications, set SYSTEM DEF, NAFRIN is ANA#2=OFF

 

 

ASSOCIATED PINS

 

NAFRIN Pin 9 of 14
NAFROUT Pin 13 of 14

 

 SMT-FTX Fuel Tuner - Analog #1 Wiring

FIGURE 5 ANALOG 1 WIRING

 

 

APPLICATION

 

The narrow band sensor has an output signal from 0 (lean) to 1Volt (Rich). This signal can be interpreted by the SMT8L and it is available for display in AFR or LAMBDA. The signal from the sensor is routed to the NAFRIN pin and exits the unit by the NAFROUT pin. The table entry is in AFR or LAMBDA, depending on the ‘Units’ choice (Tools, Units).

 

 

MAIN MAP

 

The entry is in AFR/Lambda values with a sign. Positive entries make the engine LEAN!

 

 

AMP SIDE MAP

 

The entries are in signed AFR/Lambda. Positive entries make the engine LEAN! The map is optional.

 

 

ENGINE TEMPERATURE SIDE MAP

 

The same as above!

 

 

TOTAL CALCULATION

 

Total AFR modification=   

Main map entry
 +-    AFR_AMP
 +-    AFR_ENGT