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SMT-FTX Technical Manual - Tuning Wide and Narrow AFR Sensors Simultaneously

SMT-FTX TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT-FTX Unit.

TUNING WIDE AND NARROW AFR SENSORS SIMULTANEOUSLY

This is a requirement when the Wide Band sensor BEFORE the CAT is tuned and the Narrow Band sensor AFTER the CAT requires attention. Normally, a simple limit on the Narrow input will suffice. However, an analog channel is required to full fill this function. The logical choice is ANALOG #2 (Shared with NAFR) channel.

 

For the narrow band connections and operation:

 

Tuning Airflow or Manifold pressure #2
Or:    Tuning Narrow band AFR (Lambda)

 

For the Wide sensor refer to: Tuning Wide band AFR (Lambda)

 

Summary: Tune the wide band as you wish. You are most likely tune the engine richer after fitting a turbo or supercharger. This in turn requires that the NARROW band sensor must be restricted on the upper end (the voltage must be reduced by approx. 0.2V).