amp e MS3Pro ULTIMATE - Detection; Knock Input Threshold; Recovery; Retarding

7.3 Ignition Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• Monitor Per Cylinder Enables using different knock thresholds for each cylinder. This requires sequential
fueling and/or coil on plug mode to be enabled.
• Control Per Cylinder This allows knock retard to only be applied to the cylinder that is knocking. If turned
off, knock control is applied to all cylinders.
• DEBUG data Adds per-cylinder knock measurements to datalogging.
7.3.7.2 Detection
• Knock Count (knocks): number of knock events detected before control is started
• Knock Ignored above MAP (kPa): no knock retard is implemented above this MAP
• RPM window low (rpm): knock control is implemented above this rpm
• RPM window high (rpm): knock control is implemented below this rpm. This upper limit is desirable as valve
train noise will typically mask out the knock sensor signal at higher rpm which could cause false reports of
knock.
• Ignore During Launch / Flatshift: Flat shift or launch rev limiting with a spark cut can cause enough noise
to cause false knock readings on some engines. This setting disables detection when the launch or flat shift
rev limiter is active.
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.
AMP EFI MS3ProUltimate manual version 1.203, firmware 1.5.0, 5/23/2017 Page 179