Originally Posted by
mbray01
short term and long term is just the computer memorizing where its seeing knock based on your fuel, atmospheric conditions and driving habits. This is done so it can anticipate knock before it happens. total knock is just that, how much knock it is pulling after all adders and multipliers
knock octane(usually speaking) is the computer anticipating knock based on fuel. in gm's, there is a low and high octane table, and the ecm floats between both based on octane levels, in these ecms, it literally uses an octane adjustment modifier to correct based on the base spark tables