Answer
Oct 25, 2021 - 08:33 PM
Hello Pat,
The Auto Tune feature that is build into the PV unit uses the factory narrow band O2 sensors to help get the AFRs corrected. Now the Target Tune module stays connected to the bike at all times to correct the fueling to the values within the tune.
Autotune for Power Vision VS. Target Tune:
If you are unfamiliar with the function of oxygen sensors, it's fairly simple. As you ride, the exhaust gases generated by the vehicle pass over the tip of the oxygen sensor as they head out of the exhaust. The oxygen sensor basically analyzes the data and reports the findings to the ECM. The ECM will then look at its commanded air/fuel ratio (AFR) for that specific situation (rpm, MAP pressure, throttle position). If the information it receives from the sensors does not match what is being commanded, the ECM will make adjustments to the fueling to get things where they should be, to the best of its ability. This is the "closed loop" system of those bikes.
The oxygen sensors that come installed on a bike from the factory, are "narrowband" sensors, meaning they are only accurate to sample an AFR that falls in a narrow range. The range of the stock sensors is somewhere around 14.3:1-14.9:1. If the live AFR falls outside of those parameters, the stock sensors can no longer tell just how lean or rich the bike is running, so, it can no longer make adjustments based on that data. The Power Vision (PV) accessories, such as the Autotune Pro kit and Target Tune kit, come with "wideband" oxygen sensors. They can sample an AFR anywhere from 10.0:1-18.0:1. This is a MUCH larger range. With most bikes, the stock sensors can only read and adjust the fuel settings for the "cruise" area of the tune, where we spend the majority of our time on the highway, as this is the only area where the commanded AFR is within range of the stock sensors.
Autotune: Aside from being a product, this is a process. Whether the stock, narrowband sensors are being used with the built-in Autotune Basic process or the wideband sensors of the Autotune Pro or Target Tune kit are being used, the process is ultimately the same. You enable the Autotune function via the PV while connected to the bike, select the tune you wish to work with and select which type of process/hardware you will use (Basic, AT Pro or Target Tune). The tune is adjusted and flashed to the ECM. The bike is then started, the Autotune screen brought up on the PV and the process of collecting data begins. As the vehicle is in operation and has met all of the parameters, you will begin to see data being collected on the "green screen". The tracer moves around to show you where you are on the table and you try to fill in as much of that screen as possible with cells in RED. When a specific cell turns RED, it has a sufficient amount of data to make an "educated" change, if one is needed in that area. Once the riding session is completed, you exit the green screen and can export the learned data to a custom tune slot of the PV. Autotune is disabled and the newly refined tune is flashed to the ECM. The MAIN function of the Autotune process is to calibrate the Volumetric Efficiency (VE) tables of the tune. This is an essential calibration for ANY good tune. At this point, unless the vehicle needs further refining, the process is complete.
Target Tune: Target Tune is an enhancement to the existing closed loop system of the bike. A PV tune must have Target Tune enabled by us. This can be done to an existing tune that works well or a base tune from us. This tune is then flashed to the ECM of a bike ONLY if the Target Tune accessory is completely installed. This special version of the tune allows the ECM to understand the information it is receiving from our wideband sensors. Since our sensors can read a MUCH wider range, the ECM can now work to maintain the commanded AFR, no matter what we ask of the bike. Even if we are asking for a rich value of 12.5:1 AFR at 100% throttle, the sensors will be able to sample and the ECM will be able to make the adjustments to get you there and keep you there. You can always call into Tech Support for more info at 800-992-4993, Mon-Fri 8am-5pm PST.
The Auto Tune feature that is build into the PV unit uses the factory narrow band O2 sensors to help get the AFRs corrected. Now the Target Tune module stays connected to the bike at all times to correct the fueling to the values within the tune.
Autotune for Power Vision VS. Target Tune:
If you are unfamiliar with the function of oxygen sensors, it's fairly simple. As you ride, the exhaust gases generated by the vehicle pass over the tip of the oxygen sensor as they head out of the exhaust. The oxygen sensor basically analyzes the data and reports the findings to the ECM. The ECM will then look at its commanded air/fuel ratio (AFR) for that specific situation (rpm, MAP pressure, throttle position). If the information it receives from the sensors does not match what is being commanded, the ECM will make adjustments to the fueling to get things where they should be, to the best of its ability. This is the "closed loop" system of those bikes.
The oxygen sensors that come installed on a bike from the factory, are "narrowband" sensors, meaning they are only accurate to sample an AFR that falls in a narrow range. The range of the stock sensors is somewhere around 14.3:1-14.9:1. If the live AFR falls outside of those parameters, the stock sensors can no longer tell just how lean or rich the bike is running, so, it can no longer make adjustments based on that data. The Power Vision (PV) accessories, such as the Autotune Pro kit and Target Tune kit, come with "wideband" oxygen sensors. They can sample an AFR anywhere from 10.0:1-18.0:1. This is a MUCH larger range. With most bikes, the stock sensors can only read and adjust the fuel settings for the "cruise" area of the tune, where we spend the majority of our time on the highway, as this is the only area where the commanded AFR is within range of the stock sensors.
Autotune: Aside from being a product, this is a process. Whether the stock, narrowband sensors are being used with the built-in Autotune Basic process or the wideband sensors of the Autotune Pro or Target Tune kit are being used, the process is ultimately the same. You enable the Autotune function via the PV while connected to the bike, select the tune you wish to work with and select which type of process/hardware you will use (Basic, AT Pro or Target Tune). The tune is adjusted and flashed to the ECM. The bike is then started, the Autotune screen brought up on the PV and the process of collecting data begins. As the vehicle is in operation and has met all of the parameters, you will begin to see data being collected on the "green screen". The tracer moves around to show you where you are on the table and you try to fill in as much of that screen as possible with cells in RED. When a specific cell turns RED, it has a sufficient amount of data to make an "educated" change, if one is needed in that area. Once the riding session is completed, you exit the green screen and can export the learned data to a custom tune slot of the PV. Autotune is disabled and the newly refined tune is flashed to the ECM. The MAIN function of the Autotune process is to calibrate the Volumetric Efficiency (VE) tables of the tune. This is an essential calibration for ANY good tune. At this point, unless the vehicle needs further refining, the process is complete.
Target Tune: Target Tune is an enhancement to the existing closed loop system of the bike. A PV tune must have Target Tune enabled by us. This can be done to an existing tune that works well or a base tune from us. This tune is then flashed to the ECM of a bike ONLY if the Target Tune accessory is completely installed. This special version of the tune allows the ECM to understand the information it is receiving from our wideband sensors. Since our sensors can read a MUCH wider range, the ECM can now work to maintain the commanded AFR, no matter what we ask of the bike. Even if we are asking for a rich value of 12.5:1 AFR at 100% throttle, the sensors will be able to sample and the ECM will be able to make the adjustments to get you there and keep you there. You can always call into Tech Support for more info at 800-992-4993, Mon-Fri 8am-5pm PST.
