Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software - Manual (Page 80)

BigStuff3 Pro SEFI System (LS1)
Version 1.0 79
dMAP Correction will decrease 1 step. This 3 interrupt for 1 step process continues until the
dMAP correction reaches zero.
The MAP AE Decay rate table’s fixed values (x-axis) represent coolant temperature, which
increase from left to right. The MAP AE Decay rate input values need to decrease as coolant
temperature increases. The smaller the value in the table, the quicker the fuel is taken out or
decayed.
While the engine is running, a “real-time Ellipse” will move within the MAP AE Decay rate
table relative to the current engine Coolant Temperature “operating point”. Use it as a point of
reference to help calibrate the MAP AE Decay rate table.
To change a value in the MAP AE Decay rate table, move the cursor using the PC’s mouse or
arrow keys to the cell to be changed. Input the desired value and hit “Enter” to save the change.
The inputs shown in the table below can be used as a baseline.
52. MAP AE Inc Rate
The fourth table is MAP AE Inc Rate. It is used to determine how quickly to increase the
Negative dMAP correction value after decelerating the engine at a given coolant temperature.
A MAP AE Inc Rate of 3 represents 3 crank interrupts per 1 step increase of the dMAP
Correction until it reaches zero. In other words, if you input the number 3 into the table, after 3
crank interrupts the dMAP Correction will increase 1 step. This 3 interrupt for 1 step process
continues until the dMAP correction reaches zero.
The fixed axis values in the MAP AE Inc Rate table represent coolant temperature, which
increases from left to right. The MAP AE Inc Rate table’s input values need to increase as
coolant temperature increases. The larger the value in the table, the slower the fuel is added.