Is there a way or guesstimation to calculate AFRs based on the INJ values?
You can use the following calculation as a guesstimation for target AFR’s Target AFR = 14.7 / INJ value This is by no means a true relationship to the AFR’s that come out in the end. It is exactly that, a guesstimation or rule of thumb. You should always use a fast and wide lambda or 02 sensor to determine the true AFR’s The most recent version of datalogit lets you view the INJ table in Lambda, INJ values and AFR ratio using this method.
