7.6 Boost / VVT 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• Test duty - the PWM duty cycle to be applied to the chosen VVT output under test.
• Control Interval - Synced to Cam adjusts the duty cycle each time the MS3Pro updates its data on the cam
position, which usually gives the best response. Timed mode adjusts the duty cycle once per specified timed
interval.
• Control Interval Time - the time interval in milliseconds for adjustments in timed mode.
• Range Check Measured Angles - Checks to see if the measured range is within the minimum to maximum
settings. If the cam moves out of range, this triggers a cam fault.
• Tooth Filter - Applies the cam noise filtering settings to the VVT decoder.
• Minimum VVT Duty - The lowest duty cycle to use for the solenoid.
• Maximum VVT Duty - The highest duty cycle to use for the solenoid.
PID Parameters - these are used to adjust the closed loop feedback. There are separate settings for intake and
exhaust.
• Use hold duty - Specifies whether to default to a set value when no cam change is commanded.
• Hold/neutral duty - the duty at which the cam stays still.
• Proportional gain - Proportional gain affects the strength with which changes in input immediately affect
changes in output.
• Integral gain - The Integral Gain setting affects the response to continued difference between the target cam
angle and the actual angle.
• Difference gain - The Derivative Gain setting helps to slow down the response of the Proportional and
Integral gain settings as the target is reached. Usually smaller than the other two numbers.
• Table is Advance / Retard - Controls whether the table reads the degrees advanced from the minimum
advance, or degrees retarded from minimum retard. Intake cams always use advance, while exhaust cam
tables may use a retard table instead.
Cam Settings - allow you to specify each cam’s output, function, and range of movement.
• Input - the position sensor input for this cam. (Cam 1 always uses the main cam sensor input set in Ignition
Settings.)
• Polarity - The capture polarity of the cam input. (Cam 1 typically follows the main settings.)
• No. teeth - How many capture teeth on the cam wheel.
– Note: If you are using a wheel that can be described as a set of equally spaced teeth with one or more
teeth missing, set this to the number of base teeth used. If no pulse is seen during the expected cam
range where there should be a cam teeth, the MS3Pro simply “throws out” the reading. For example,
if you have a cam trigger with teeth at 0, 60, 120, and 240 degrees, sett the number of teeth to 6. The
MS3Pro will look for a tooth every 60 degrees, and simply will not update the cam position at the 180
and 300 degree points.
• Output - where the PWM solenoid valve is connected.
• Minimum - the minimum absolute angle from the cam sensor. See setting up. This is the angle of the signal
from the sensor - not necessarily the actual cam center angle.
• Maximum - the maximum absolute angle from the cam sensor.
• Int./Exh. - specifies if the cam is an intake or exhaust cam. This determines the PID parameters, direction
and target table to be used.
• Tooth 1 - only used by BMW V10 at present. Look for the cam tooth edge after this crank tooth no.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 214
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