Als Roving Idle Fuel Cut; Vvt Settings - amp e MS3Pro ULTIMATE User Manual

7.6 Boost / VVT
Anti-lag functions operate on a TPS vs RPM basis. The TPS range is fairly low as anti-lag is only active at part
throttle. The tables available will depend on what anti-lag options have been enabled, although the Added Fuel
%age and ALS Timing will always be available if anti-lag is on.
• Added fuel %age - The amount of extra fuel to add when anti-lag is active.
• ALS timing - This is a timing table in absolute numbers which the MS3Pro will use when anti-lag is active.
As the MS3Pro specifies timing with BTDC numbers being positive, negative numbers indicate to retard the
timing to after top dead center.
• Spark cut % - The percentage of spark events to cut if cyclic spark cut is enabled.
• Fuel cut % - The percentage of injection events to cut if cyclic fuel cut is enabled.

7.6.13 ALS roving idle fuel cut %

This screen is enabled when the roving (rotational) idle is enabled. It allows you to set the percent of fuel
injection events to cut to limit idle speed on cars that do not allow added air bypass items and therefore have the
throttle adjusted open to allow more air to flow into the turbo with the throttle "closed". Note that the right hand
column needs to be set to all zeroes.

7.6.14 VVT settings

Many engines now feature variable valve timing. This allows a balance between engine performance and economy,
with the ECU automatically adjusting the valve timing to suit operating conditions. The particular implementation
varies with engine and manufacturer. The first systems available are of the "on/off" variety where the cam is moved
by a fixed angle only, and there is no feedback systems. Examples of this include:
• Honda first generation VTEC
• Toyota first generation VVT
• BMW single VANOS
More advanced systems use continuously variable cam controls - typically an oil solenoid valve controlled by a
PWM signal from the ECU. The ECU uses one camshaft position sensor per cam to compare the cam advance to
a crankshaft position sensor reading. Examples of continuously variable systems include:
• Toyota VVTi
• BMW double VANOS
• Ford Zetec and Ti-VCT
AMP EFI MS3ProUltimate manual version 1.203, firmware 1.5.0, 5/23/2017
7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
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