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Air Fuel Ratio (AFR) Lambda Controller - Low Cost



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Air Fuel Ratio (AFR) meter

AFR Lambda Controller Budget


Low cost Air Fuel Ratio (AFR) system interfaces to DYNertia3 or data loggers, they have no display as they use the DYNertia3 (or 3rd party logger) software for display.


The precision analogue output voltage accurately represents the AFR or Lambda.

Lambda: 0V = λ 0.5, 5V = λ 2.0  (AFR: 0V = 7.35, 5V = 29.40)


WB-LC includes the latest Bosch LSU4.9 wideband oxygen sensor for reliable and accurate operation, not the outdated LSU4.2 like most competitors are still using.


High accuracy and fast response (5ms) are key design features of our AFR/Lambda unit and a range of λ = 0.50 – 2.00 (Gasoline AFR: 7.35 to 29.40) ensures compatibility with different fuel types.


0-5V analogue linear output voltage is generated from a dedicated ’10 bit’ digital to analogue chip for precision and speed, not a cheap filtered PWM signal like many competitors.


The heart of the system is a special Bosch ‘CJ125’ lambda sensor control chip along with an automotive grade microprocessor.  The CJ125 is rarely used in AFR meters due to cost, but Bosch use it wherever an LSU sensor is used in vehicles or even in their own “LT4” controller. Bosch know best when it comes to wideband oxygen sensor control!

Kit Contents-        

• Small rugged AFR/Lambda controller with 0-5V output
• Bosch LSU 4.9 Lambda (Oxygen) sensor
• Harness (110cm from connector to wire end)
• Sensor 'weld-in' plug and bung

 Click on the icon below to view the AFR/Lambda controller manual-

Budget Air Fuel Ratio AFR Sensor

Low Cost Air Fuel Ratio (AFR) Unit Manual


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