Air Fuel Ratio what is it and why it is important for engine tuning

Some words of Wisdom about AFR Air Fuel Ratio

Regardless of what some people may claim, it is impossible to properly tune a fuel injection system on a modified engine without some means of exhaust gas analysis. Some words of Wisdom about AFR Air Fuel Ratio

Regardless of what some people may claim, it is impossible to properly tune a fuel injection system on a modified engine without some means of exhaust gas analysis. Black Ops Moto offers the AF-5000 as a low cost alternative to expensive systems.
Conventional (narrow-band) exhaust gas oxygen sensors have been widely used in automotive applications since 1981. Conventional sensors have one to four wires and can only sense air/fuel ratio over a relatively narrow 14.5 to 15.0 range. They are intended to be used with 3-way catalytic converters that require operation near the stoichiometric point (14.7 air/fuel ratio).
The range of narrow-band sensors is inadequate for performance tuning. While originally developed for lab and specialized automotive applications, wide-band sensors are ideal for tuning. The 5-wire Bosch LSU 4.2 sensor used with the AF-5000 operates over a range of 10.3 to infinite air/fuel ratio.

The AF-5000 features built-in data logging. This data logging capability greatly facilitates engine tuning and diagnosis of driveability issues. The AF-5000 can store data up to 2 hours of operation. You can use our WEGO Log software to download and display this data on a chart recorder type screen.
Available data includes:
1) AFR (air/fuel ratio)
2) RPM
3) 0-5V analog.

Additional Black Ops Moto features include:

· Complete air/fuel ratio metering system with built-in data logging. Includes WEGO II Wide-Band Exhaust Gas Oxygen Sensor Interface, Bosch LSU4.2 5-wire wide-band oxygen sensor, 18x1.5mm weld nut for mounting sensor on exhaust pipe, and software on CDROM

· Versatile tuning aid for all carbureted and fuel injected engines displays AFR (air/fuel ratio) and logs over 2 hours data including AFR, engine RPM, and a spare 0-5V analog input for sensors such as throttle position or manifold pressure.

· Can be used for on-road or dyno testing.

· Suitable for automotive, motorcycle, and other small engine applications.

· Highly accurate with less than ±0.10 AFR error over 10.3 - 19.5 AFR range.

· Easy free-air calibration procedure corrects for sensor aging effects.

· Red LCD display with backlight provides great readability in all conditions ranging from bright sunlight to total darkness. offers the AF-5000 as a low cost alternative to expensive systems.
Conventional (narrow-band) exhaust gas oxygen sensors have been widely used in automotive applications since 1981. Conventional sensors have one to four wires and can only sense air/fuel ratio over a relatively narrow 14.5 to 15.0 range. They are intended to be used with 3-way catalytic converters that require operation near the stoichiometric point (14.7 air/fuel ratio).
The range of narrow-band sensors is inadequate for performance tuning. While originally developed for lab and specialized automotive applications, wide-band sensors are ideal for tuning. The 5-wire Bosch LSU 4.2 sensor used with the AF-5000 operates over a range of 10.3 to infinite air/fuel ratio.

The AF-5000 features built-in data logging. This data logging capability greatly facilitates engine tuning and diagnosis of driveability issues. The AF-5000 can store data up to 2 hours of operation. You can use our WEGO Log software to download and display this data on a chart recorder type screen.
Available data includes:
1) AFR (air/fuel ratio)
2) RPM
3) 0-5V analog.

Additional Black Ops Moto features include:

· Complete air/fuel ratio metering system with built-in data logging. Includes WEGO II Wide-Band Exhaust Gas Oxygen Sensor Interface, Bosch LSU4.2 5-wire wide-band oxygen sensor, 18x1.5mm weld nut for mounting sensor on exhaust pipe, and software on CDROM

· Versatile tuning aid for all carbureted and fuel injected engines displays AFR (air/fuel ratio) and logs over 2 hours data including AFR, engine RPM, and a spare 0-5V analog input for sensors such as throttle position or manifold pressure.

· Can be used for on-road or dyno testing.

· Suitable for automotive, motorcycle, and other small engine applications.

· Highly accurate with less than ±0.10 AFR error over 10.3 - 19.5 AFR range.

· Easy free-air calibration procedure corrects for sensor aging effects.

· Red LCD display with backlight provides great readability in all conditions ranging from bright sunlight to total darkness.

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