7.6 Boost / VVT 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• Dome empty output min duty and dome empty output max duty - If using PID control for the dome
pressure, this sets upper and lower limits for what duty cycles to use when decreasing pressure.
• Dome fill and empty output frequency - If using PID control, this setting controls how rapidly to pulse the
solenoids.
• Dome MAP sensor input - Specifies which sensor channel to use for the dome pressure sensor. This must
be set up under Generic Sensors.
• Dome pressure dead zone - When using simple mode, this sets up a range of pressures between where to
fill the dome and where to empty the dome. If the dome pressure is within this range of the target pressure,
the MS3Pro will consider the pressure level “good enough” and close both solenoids unless the pressure
reading or target dome pressure changes. If you have trouble with the dome pressure overshooting, try
increasing this number.
• PID settings - These adjustments control dome pressure response if using PID control.
– Closed Loop Sensitivity - Use this setting to tune how aggressively the boost controller tries to reach
the target boost. Adjust the slider up until the boost oscillates around the target, then back down until it
stops.
– 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
boost and the actual boost.
– Derivative Gain - The Derivative Gain setting helps to slow down the response of the Proportional and
Integral gain settings as the target is reached. This should be used sparingly as it can also completely
dampen the other two Gains.
7.6.10 Dome Bias Table
This pressure lets you specify what dome pressure to target as a function of target boost and RPM when using
closed loop dome pressure based boost control. For example, in the table shown above, the MS3Pro will start at
a 235 kPa dome pressure if targeting 200 kPa boost at 4220 RPM.
7.6.11 Turbo anti-lag (ALS)
Anti-lag is a combination of features you can use to keep the turbo spooled while shifting, beyond the basic flat
shift rev limiter. The MS3Pro has several strategies it can use to dump extra fuel into the exhaust and increase
exhaust gas temperatures under these conditions. This increase in exhaust temperature will shorten turbo life and
possibly result in increased wear and tear on other parts of the exhaust system as well.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 209
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