When you start your vehicle we refer to this as being in IDLE condition. IDLE / LIGHT CRUISE: 13.5 AFR - target with GREEN mode RECOMMENDED AFR VALUES TO TARGET WITH FUELING MODES: The sensor targets a NARROW range around the stoich AFR value of 14.6 to help stock ECU systems fuel trim to meet emission standards.Ī Wideband O2 Sensor is much more sophisticated and can supply the exact AFR measurement across a WIDE range of possible AFR values.
Aem air fuel ratio gauge flashes 3 times full#
The AFR+ system uses a wideband O2 sensor to display the full range of AFR values and target performance AFR values along with fuel economy AFR values.Ī Narrowband O2 Sensor is only calibrated to know whether the current AFR is rich, lean, or stoich.
A huge misunderstanding results from the type of O2 sensors which can be used in each application. The concept of implementing an auto-tune / closed loop / self mapping fuel control system has also become prevalent in the after-market tuning industry. Closed loop is using the O2 sensor input signal to react rapidly to the changing conditions and make fuel trims to match the desired air/fuel mixture.ĪFR Values & Characteristics in Four Stroke EnginesĦ.0 AFR - Rich Burn Limit (engine fully warm)ġ1.5 AFR - Best Rich Torque at Wide Open Throttleġ2.2 AFR - Safe Best Power at Wide Open Throttleĭue to emission regulations the use of O2 sensors has become prevalent in the powersports industry on OEM vehicles. Open loop means NO fuel trimming is occurring based on the O2 sensor signal. Open loop vs Closed loop - Different operations both the stock ECU and the AFR+ can function under independently. DP's EFI tuning technology is a load based system. Coasting downhill is considered very low load. Load - Is the measurement of how hard an engine is working. A wideband O2 sensor is much more sophisticated and can supply the exact AFR measurement across a wide range of possible AFR values. Wideband vs Narrowband sensors - A narrowband O2 sensor is only calibrated to know whether the current AFR is rich, lean, or stoich. Oxygen (O2) Sensor - Is an electronic device that measures the proportion of oxygen (O2) in the exhaust gas. It is the ratio between the mass of air and the mass of fuel in the air-fuel mix at any given moment.
Aem air fuel ratio gauge flashes 3 times how to#
Like any electronic device you need to know the basic operations before you can fully start to use the equipment.
AFR+ Basic Functionality - Understand AFR Values, Wideband O2 Sensors, and Fuel Trim vs.
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