Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 91)

BigStuff3 Pro SEFI System
Version 2.1 – February 2011 84
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 (throttle tip-out) 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.
While the engine is running, a “real-time Ellipse” will move within the MAP AE Inc Rate table
relative to the current engine Coolant Temperature “operating point”. Use it as a point of reference to
help calibrate the MAP AE Inc Rate table.
To change a value in the MAP AE Inc 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.
53. Run Time Correction
The fifth table is Run Time Correction. It only influences the Positive dMAP and dTPS Correction
Values for a short period of time after the engine is running. (i.e. up to 8 minutes). The Run Time