as 127 degrees if you really wanted to. Of course, the engine wouldn't even start or run at that timing, but you can do it if you wanted to. The timing is variable depending on engine condition so you can set it to be anything at the specified points in the map and the ECU interpolates the values to 'smooth' the points in-between.
The techtom shows what the ACTUAL timing is with the assumption that your base timing (adjustable by the CAS) is actually set to 15 degrees. At idle the techtom shows 15 degrees because it is in hard idle mode (determined by the hard idle switch) and when it says 15 degrees, you set the base timing to 15 degrees so that the points in the map are actual timing in degrees and not some 'offset' by improperly setting the base timing. The CAS adjustment is simply to allow for proper calibration of what the ECU thinks the position of the crank is so that the map values are correct.
