7.2 Fuel Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
7.2.5 Over Run Fuel Cut
The MS3Pro not only allows you to cut off fuel while coasting; it also allows retarding spark timing at this point,
and gradually phasing the fuel cut in and out to make for a smoother transition. Overrun fuel cut relies partially on
engine state settings to determine if the engine is in overrun mode.
• Over-run fuel cut - Allows turning this feature off or on.
• CLT greater than - Allows locking out fuel cut on a cold engine.
• After delay - Specifies how many seconds the MS3Pro will wait after trigger conditions are met before
engaging fuel cut.
• Progressive fuel cut - Allows cutting cylinders one at a time to smooth the transition.
• Ignition timing transition - Changes the ignition timing during overrun fuel cut.
• Ignition timing during over-run - The absolute timing during overrun fuel cut. Positive numbers are BTDC
and negative numbers are ATDC.
• Cut transition time - The amount of time to transition in the spark retard and progressive fuel cut.
• Progressive fuel return - Allows gradually returning fuel. If using this setting, we recommend not using the
fuel adder.
• Ignition timing transition return - Allows gradually transitioning from spark retard to normal timing.
• Return transition time - The time, in seconds, from re-engaging fuel to returning to full fuel (if progressive
fuel return is used) and ignition timing (if ignition timing transition return is used).
• Lowest RPM to re-engage fuel - If the RPM falls below this value, fuel is turned back on. Typically a few
hundred RPM lower than the minimum RPM for fuel cut.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 157
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