Air Fuel Gauges

Air Fuel Gauges

Here at Vivid Racing, we offer a wide selection of industry-leading Air Fuel ratio gauges to keep your vehicle from running too rich or too lean. With our vast assortment of both narrow band and wideband air fuel gauges to monitor your motor, avoiding expensive repairs has never been easier. Now in both digital and analog gauge styles.

The purpose of an AFR gauge is to measure the air to fuel ratio of your engine. There are two air fuel gauge options to choose from: a narrow band and a wideband AFR. The difference between these two types is that a wideband air fuel gauge gives you information from the internal combustion chamber while the narrowband uses your car’s factory oxygen sensor to show its air to fuel ratio. While it may not be very common for your air fuel ratio gauge to fail, your oxygen sensor may need calibration to give you proper data logging. In the case that your narrow band or wideband air fuel ratio does in fact stop working, your engine can be damaged. In some cases, your sensor can also malfunction and cause the check engine light to go on. 

The exhaust gases produced by your engine are a mixture of air and fuel. When there is too much air present in the mixture, it is referred to as lean, when there is too much fuel it is considered rich and when just the right amount of air is used and produces a complete burn, it is referred to as a stoichiometric ratio (stoich).

A wideband oxygen sensor is very accurate when at operating temperature and has a 0-5 volt output range, which the gauge will convert to a value ranging from 10.0:1-19.0:1. A factory narrowband oxygen sensor communicates directly with the ECU and only has an output of 0-1 volt, which will only read a small range that deviates from stoich and not an actual air/fuel value.

Because the stoich AFR mixture changes with the type of fuel being used, many people become confused when their wideband gauge displays the wrong AFR targets for their fuel choice. This is because your wideband oxygen sensor is only designed to read the oxygen content of the exhaust gases and doesn’t care what fuel is being used. The gauge then receives the data in a universal scaling called lambda, which the gauge then converts to a gasoline scaled AFR range.

A lambda scale generally reads from 0.75-1.15 on a wideband gauge and no matter what fuel is being used the stoich lambda target will always be 1.00. So, unless you have memorized the conversion from a gasoline AFR scale to the scaling of your fuel choice, it is generally recommended to reconfigure your wideband gauge to display in lambda when running alternative fuels to avoid any confusion.

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