Note: We strongly recommend AEM 30-0334 for our Gen IV & V (CAN) customer vehicles.
Often we have customers send datalogs where the wideband clearly isn’t matching up with the narrow band sensors. This is because the voltage out from the wideband or the voltage IN to HP Tuners isn’t correct. Likely because of some floating ground situation but some widebands just have poor voltage out.
To help correct this, we suggest videoing the gauge face and the HP Tuners VCM Scanner while the engine is running. Randomly stop the video in a few spots and check to see that the value read in HP Tuners matches the gauge face.
Click here to download our Excel sheet to find Wideband Transfer function for AFR and EQ ratio.
If the scanner and gauge face do not show the same value at the same time, change the scanner to record raw voltage from the wideband. While recording voltage from the wideband, start another log and video the gauge face and the scanner so that you can see raw voltage from the wideband in the video. Pause the video in a few spots. Try to grab the richest and leanest example you can. Use the richest and leanest example you can find along with the corresponding voltage reported in HP tuners Scanner in the excel sheet above. This will give you a new calibrated transform function for your wideband and how it is installed in the car.
When you setup a user defined transform, take care to set up the sensor, units, etc. You can see the image at the top of the spreadsheet for a sample.
Looking for more information on our remote tuning? Click here.
