AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 201)

Tuning Guide 195
© 2014 AEM Performance Electronics
The Infinity has 2 inputs for knock sensors. These can be passive, where data is displayed and/
or recorded or the feedback knock control can be enabled, letting the Infinity take action to
counter the knock. The Infinity ECU measures knock sensor activity during a specific window for
each cylinder; this allows the ECU to detect individual cylinder knock levels using only one or two
sensors. Because some sensors may be located nearer or further from the cylinder. Knock
Noise Floor tables are available for each cylinder. When sensor activity exceeds the Noise Floor,
ignition timing can be retarded for that cylinder.
KnockNoiseFloor1 Table
Units: Voltage vs Engine Speed
Description: The KnockNoiseFloor1 Table sets an RPM dependant threshold to filter out
background noise from cylinder 1. Setting up this table is key to the success of this function.
Whenever the knock sensor voltage input exceeds this table's voltage value, it is considered to
be detonation. The difference between the detonation signal and this threshold value determines
the severity of the knock.
KnockNoiseFloor2 Table
Units: Voltage vs Engine Speed
Description: The KnockNoiseFloor2 Table sets an RPM dependant threshold to filter out
background noise from cylinder 2. Setting up this table is key to the success of this function.
Whenever the knock sensor voltage input exceeds this table's voltage value, it is considered to
be detonation. The difference between the detonation signal and this threshold value determines
the severity of the knock.