A wide-band sensor, on the other hand, has a very linear output, 0–5 V, and requires a much hotter running temperature.

As mentioned before, the main problem with any narrow-band O 2 sensor is that the ECM only detects that the mixture is slightly richer or leaner than the stoichiometric ratio. The ECM does not measure the operating air-fuel ratio outside the stoichiometric range. In effect it only detects that the mixture is richer or leaner than stoichiometry. An O 2 sensor voltage that goes lower than 450 mV will cause a widening of injector pulse and vice versa. The resulting changing or cycling fuel control (closed-loop) O 2 signal is what the technician sees on the scope when probing at the O 2 sensor signal wire.

And that is why this tool comes with the proper instructions that will help you to set it up without much trouble. On the other hand, the product includes two configurable analog outputs. Both of them are linear and include a range of around 0 to 5 volts for maximum user convenience. Hence, you can get air/fuel values at a wider range. More importantly, you won’t be needing a computer or any other electronic device for use or configuration when it comes to this device. However, you may need one for data logging and such tasks. Apart from all that, the gauge comes with a commendable display, which will allow you to see the values clearly. Contrary to the MaxTow Double Vision AFR gauge, the Auto Meter 4379 is specifically designed for race and streetcars. Thanks to its ability to work with the 12 – 16 V electrical system of most race cars.

It is possible to set up a custom map to protect the engine for an excessively rich or lean condition, and this can prove useful on a forced-induction vehicle. We will not cover how to set up these safe guard maps in this article, but please search the knowledge base for the specific set up you require. Some ideas for Safe Guards are discussed below. The 7 gauges come in 7 different colors, which makes it easier to differentiate them from one another. If you want to make the most out of your fuel while making sure that you are decreasing your CO2 emissions, having an AFR that’s higher than stoich should be a good value. In most cases, the best AFR in terms of fuel economy tends to be somewhere close to 16.5 but not higher because anything a lot higher than that may cause you to reach your engine’s lean burn limit. Sources But, the kit includes necessities other than the gauge itself. For instance, it includes programming option and a sensor cable, along with weld-on bung and a manual for a clear understanding of the installation process and gauge. Nonetheless, this device provides accurate air-fuel ratio readings at sea level. Besides, it comes at a very affordable price, making it a great option for car owners on a tight budget.Most stand-alone narrow-band meters have 10 LEDs and some have more. Also common, narrow band meters in round housings with the standard mounting 2 + 1⁄ 16 and 2 + 5⁄ 8in) diameters, as other types of car 'gauges'. These usually have 10 or 20 LEDs. Analogue 'needle' style gauges are also available. There was an adjustment so you could raise or lower the rod relative to the throttle position. Just loosen a screw and move the arm on the shaft, retighten screw.... done.