Although not a requirement, a Lambda sensor allows feedback to the ECU about the fuelling - the ECU can then adjust its fuelling in real-time based on this data - known as closed loop lambda control.


Without closed loop, the ECU will only take into consideration the target AFR (Air Fuel Ratio) as a function of the VE formula - it will not act upon any reported AFR data. Both narrowband and wideband O2 sensors are supported, however, when using a narrowband sensor, only ‘emissions targeting’ is recommended. Wideband however allows full closed loop targeting of the AFR in correspondence with the target AFR table for real time fuelling corrections.


If you are planning to not use a lambda sensor, or a Narrowband sensor, that is, one which outputs 0-1V dependant on mixture, then no HRT calibration is required, however, if you plan to use a external wideband sensor (with its own controller) that outputs a 0-5V signal, then you will need to configure it in the WBO2 HRT table, which can be accessed from the tree view, HRTs>WBO2 HRT.


Much like the MAP sensor calibration, the wideband controller will come with a manual or data sheet that specifies the Lambda/AFR for each given voltage output. Most on the market follow the rule of 0v=10:1 AFR and 5v=20:1 AFR (Which would be a RAW of Zero meaning 10:1 AFR, and RAW of 65535 (or voltage of 5v) being 20:1 AFR). All of our base maps have this table set as default, and if you wish to change them you can follow the same procedure as when calibrating the MAP sensor.


Once you have set the WBO2 HRT table, and have it connected to the ECU, and the correct analog voltage pin assigned to O2 RAW, the WBO2 Current AFR readout (which can also be logged) should match the WBO2 reading your controller is reporting - even if you don't enable wideband control.


Note: There is a known issue with certain AEM gauges whereby the AEM gauges reading will differ from the MEITE’s ‘WBO2 Curr. AFR’ DRO - this has been noted with other ECUs also - you should use the MEITEs reading as opposed to the gauges.