[AZFA20]

Originally Posted by buditjoenawan

It doesn't matter if it's phantom knock or real knock, since the ECU is applying self preservation tactics anyway. As a result, the car will feel like it's stuttering, hesitating, bucking. Regardless of real or not, the ECU "hears" more things happening and takes preemptive measures to mitigate the possibility. The lower octane fuel, and who knows if there are any weird blends or oxygenation that is in the gas, will inherently be less stable at higher chamber pressures. At this point, I am assuming that the motor is octane limited; smart tuners please refute me.

Paul, does the ignition advance multiplier go beyond 1.0? If I was tuned for 91 octane, then moved to an area with 93 octane, will the ECU adapt to the higher octane?

budi

This may be true but a second set of ears per se will confirm weather it is real or not and this can be tuned out during tuning. Since I am not an EcuTek Master tuner I don't have access to what all it can do but if it is anything like any other tuning software you can adjust knock sensitivity and the total amount of knock retard when detected. You can even adjust in most cases the speed in which it pulls timing. There are a bunch of different ways you can change how the ECU reacts to knock detection but you must first determine whether it is real or not before making these adjustments. It is very frustrating to me that I cannot dig into the ECU myself without paying an arm and a leg for the Master EcuTek license but at the same time I like it because it keeps people from ripping off your hard work in tunes. Once you start really modifying you vehicle the stock knock sensors can start picking up all kinds of false readings so this is a great way to account for that.