SMT8-X TECHNICAL MANUAL

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Support for your SMT8-X Unit.

NARROW AFR (LAMBDA) MODIFICATIONS

The SMT8_X 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 BOSCH exhaust sensor. This in turn affects the ECU fuel loop. Thus AFR tuning becomes a powerful tool for fuel modifications.

 

 

ASSOCIATED PINS

 

NAF1IN Pin 14 of 14
NAF1OUT Pin 13 of 14
NAF2IN Pin 7 of 14
NAF2OUT Pin 6 of 14

 

SMT8-X Piggy-Back Unit - Narrow Band Lambda Wiring

NARROW BAND LAMBDA WIRING

 

 

ANALOGUE AFR MODIFICATIONS

 

The two channels can be converted to analogue channels by ticking the SYSTEM DEFINITION boxes. This allows a voltage from 0-5Volts to be modified, instead of the traditional 0-1Volt signal. In the analog mode the map entries are in volts. The connections stay the same. Of course, a 0-1Volt BOSCH signal can also be modified in this mode.