![]() Hooked up to a gauge, you will see it sweeping back and forth as those adjustments are being made - bouncing to each voltage and back to the opposite. Since the ECU idles at 14.7:1 AFR, it makes small adjustments to ensure the voltage is within that range. Narrowband O2 Sensors Should Never Be Used for TuningĪ narrowband O2 sensor outputs 14.7:1 as. Adjustable solutions may also provide the owner the ability to modify boost settings, and again, the wideband can determine if retuning is needed. Whether adjustable piggybacks, like the Voodoo, PowerCard, or Rising Rate Fuel Pressure Regulators, the adjustments should be fine tuned. Other Adjustable fueling solutions (piggybacks, RRFPRs) (still considered bandaids) are the shades of gray in between options 1 and 2. A wideband, even with off-the-shelf kits or non-adjustable piggybacks, will help ensure the right fueling.ģ. As they get sold on the secondary market, it may be difficult to tell if it was made for your year. In other cases, many non-adjustable piggybacks could be made for specific model/years with different fueling requirements. This means a car could run fine for one customer, but completely rich (or lean!) for another customer in a different environment. Because they cannot be adjusted, the manufacturer must often make a solution that fits all Miatas from every climate/environment/model. Non-adjustable piggybacks are one of the oldest and poorest fueling solutions equating to tech from the 1980/1990's, but are frequently found in off the shelf kits (especially kits used for CARB-approval). When the piggyback sees positive pressure, it will intercept the OEM signal and increase it to add more fuel. The stock ECU that tells the injector to open and provide fuel under OEM conditions. Non-adjustable piggybacks (considered bandaids), are outdated tech, but still found in use from time to time. 5V is common, but confirm with your ECU/Wideband configuration.Ģ. Note that different Widebands may use different voltage ranges to express a specific Air Fuel Ratio (AFR). ECUs with CANBus digital inputs are now common features and highly recommended to ensure your ECU is reading the voltage signal accurately. When selecting a wideband, research your selected ECU to verify it can support the wideband of your choice. Standalone ECUs use widebands to take basic startup maps and help tailor them to your car's specification for basic road tuning. Whether installing a custom FI solution, turnkey "set it and forget it" solution, or something in between, a wideband should always be used. A narrowband O2 sensor, such as the one used on stock Miatas is not adequate. A wideband O2 sensor is absolutely a prerequisite when adding forced induction to your Miata, regardless of fueling solution. ![]()
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