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

SMT-FTX TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT-FTX Unit.

TUNING WIDE BAND AFR (LAMBDA)

Most modern engines, especially turbo engines, have a WIDE BAND probe before the CAT. The reading of this probe can be ‘influenced’, but it can’t be displayed. The circuit is optimized for the BOSCH LSU-4 probe, which has 5 wires from the engine and 6 wires to the OEM ECU.

 

The SMT-FTX has ONE wide band modification channel. The input and output are combined on one WBMOD, pin 11 of 14.


The connection must be performed with one wire:

WBMOD pin 11 LSU-4 RED

 

Depending on the specific sensor you have and the associated connector the following pin out may be helpful:

 

LSU Wire LSU Pin Numbers
  Signal 7057 6066 17025  
RED IP 6 1 1 RED
BLACK VS 1 2 6  
YELLOW VSIP 5 3 2  
WHITE H- 4 4 3  
GREY H+ 3 5 4  
Open* RCAL 2 6 5 GREEN

 

Explanation:
The LSU-4 sensor has a calibration resistor build in to the connector. The value is between 50 and 150 Ohm. One side of the calibration resistor has NO wire attached. This is the GREEN signal. The other side of the resistor has a wire attached and this is RED.

 

 

MAPS

SMT-FTX Fuel Tuner - F10 - WAFR Modification Map

 

CALCULATIONS

 

Main map entry            approx. 100 counts = 1AFR
+ Engine temperature map entry        “        “
+ AMP map entry                “        “
+ WIDE BAND ZERO (parameter)