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Assigning AFR Oxygen (O2) Sensors to Cylinders

A Wideband O2 Sensor (and Controller) is a sensor that you install in your exhaust to measure the Air-Fuel Ratio (AFR) of your engine.  The AFR tells us useful information about the combustion process and is commonly used to tune the fuel maps on a bike.  The Wideband O2 Controller converts the signal from the sensor into an analog 0-5v voltage, which can be logged alongside other engine data allowing you to accurately tune your fuel maps using a Woolich Racing Log Box v3 and the AutoTune feature in the WRT software. 

Many bikes have a single exhaust so measurement of AFR can be done with a single oxygen sensor, a Zeitronix Zt-3 sensor and controller kit will work well in this situation.

Some bikes have multiple exhaust pipes and it may be desirable to tune individual cylinders.  This can be done with a single sensor and moving it between the exhaust pipes, or by using multiple sensors and installing them into specific pipes.  Both of these scenarios require that we define the location of the sensors in the WRT software, the AFR readings will then correlate to the correct cylinder. 

The configuration of AFR sensors is done in the main 'Settings' window under the tab 'Cylinder AFR' as shown below:


This setting is used to link the correct AFR sensor to the cylinders that it is sampling, for Autotune, Engine Data, etc.

If you have 1 x Zt-3 connected and it is sampling all 4 cylinders (O2 sensor is fitted after all 4 headers join into 1 pipe), then you would set the AFR for all 4 cylinders to AFR1.

This setting also allows the use of 2x Zt-3s such as a Ducati V-Twin, in this case you would set Cylinder 1 to AFR 1, and Cylinder 2 to AFR 2.

On a Ducati V4 with a sensor fitted to the front, and rear 'banks', you would set Cylinder 1 and Cylinder 2  to AFR 1, and Cylinder 3 and Cylinder 4 to AFR 2.

It is also possible to connect 2 x Zt-4s (Zt-4 is a dual-AFR sensor model) with 1 sensor in each header pipe, and map each AFR input to a single cylinder.

To connect more than one Zt-3 to a Woolich Racing Log Box, you will require a special data cable splitter.

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