7.1 Basic / Load Sections 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
7.1.11 ITB load settings
ITB tuning mode builds on the capabilities of the dual table blended tuning approach but solves one of the more
significant drawbacks to that tuning mode: it provides the blended Speed-Density/Alpha-N behavior of the blended
dual tables in just a single table. This single table approach is a significant improvement as all the automatic tuning
tools available through TunerStudio now work correctly with the single table.
The ITB mode uses a hybrid of speed density and alpha-N for load. This load type is selected in the tuning
configuration the same way that Alpha-N, Speed-Density, or blended tuning are selected. ITB load is also available
for the other tuning settings including AFR, Ignition, and Enhanced Accel Enrichment.
The ITB Load is derived from a combination of MAP and TPS values as well as other ITB-related tuning curves
that all work together to create a calculated value that is used as the "ITB Load" and applied to the Y axis of the
tuning tables in the same way that MAP is used for Speed-Density tuning or TPS is used for Alpha-N tuning.
7.1.11.1 ITB load VE table ITB Load tuning uses a single VE table to control fuel but this VE table is partitioned
into two regions, one for Speed-Density and one for Alpha-N tuning. There are two tuning curves and a couple
of configuration values that must be set up to correctly partition the VE table for a given engine. The curves and
values are:
• % Baro Switchpoint - The MAP value where tuning switches from TPS based to MAP based. Default is 90%
and works for most engines.
• Idle TPS Threshold - A minimum TPS value that must be met to allow the switch to TPS based tuning to
occur. This is sometimes useful in idle tuning.
• ITB Load TPS Switchpoint - A TPS curve that defines the TPS value across the RPM range where the MAP
value reaches the pre-defined %b baro switch point.
• ITB Load at TPS Switchpoint - A curve that allocates the amount of each VE table column that will be
allocated to MAP based or TPS based tuning.
The diagram below illustrates how the ITB load VE table is partitioned for dual use. The region of greatest MAP
change (below %Baro switchpoint) is tuned using Speed-Density based tuning. The region of greatest TPS change
(above %Baro switchpoint) will be tuned using Alpha-N based tuning. This is exactly the same technique used in
the blended tuning, just applied within a single table.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 142
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