7.3 Ignition Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
7.3.7.3 Retarding
• Maximum Retard (deg): maximum total retard when knock occurs. This can be useful to prevent timing
from being excessively retarded (avoiding potential overheating issues) if the senor malfunctions or there are
other problems with the knock sensing system.
• Retard Check Time (sec): this is the time between knock retard corrections, allows short time step to quickly
retard.
• Retard Coarse Step Size (deg): ignition retard step size when 1st knock, make it large to quickly retard the
timing and stop knock.
• Retard Fine Step Size (deg): ignition retard step size when knock restarts after it had stopped.
7.3.7.4 Recovery
• Advance Check Time (sec): this is the time between knock advance corrections (I.e., timing return to
"normal")
• Advance Step Size (deg): ignition advance step size after knock has stopped.
• Recovery Advance (deg)): this is the change in table advance required to restart advance until knock or
reach table value (0 knock retard) process. This only applies in Safe Mode.
7.3.7.5 Knock input threshold For analogue and internal modes, this sets a threshold level. If the measured
knock signal exceeds the threshold, then the control system is started. This allows different thresholds to be
applied to match actual engine behavior. The curve will need to be set empirically by examining datalogs of
knock% when operating the engine under safe conditions.
7.3.8 Knock sensor parameters
This screen is used with the internal knock processing.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 174
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