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SMT8_4 Technical Manual - Narrow AFR (Lambda) Modifications

SMT8_4 TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT8 V4 Unit.

NARROW AFR (LAMBDA) MODIFICATIONS

The SMT8_4 has 2 narrow band AFR channels, both are modified with the same map. The purpose of the AFR (Lambda) modification channels is to change the AFR reading the ECU receives from an exhaust sensor. This in turn affects the ECU fuel loop. Thus AFR tuning becomes a powerful tool for fuel modifications.

 

 

ASSOCIATED PINS

 

NAFR1IN Pin 5 of 16
NAFR2IN Pin 11 of 12
NAFR1OUT Pin 14 of 16
NAFR2OUT Pin 15 of 16

 

SMT8V4 Piggy-Back Unit - Narrow Band Lambda Wiring

NARROW BAND LAMBDA WIRING

 

 

NARROW BAND SENSOR

 

The narrow band sensor has an output signal from 0 (lean) to 1Volt (Rich). This signal can be interpreted by the SMT8_4 and it is available for display in AFR or LAMBDA. The signal from the sensor is routed to the NAFR1IN (NAFR2IN) pin and exits the unit by the NAFR1OUT (NAFR2OUT) pin. The table entry is in AFR or LAMBDA. The tuning map will modify both narrow band AFR channels simultaneously.

 

SMT8V4 Piggy-Back Unit - F7 - Lambda/AFR Modification