Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software - Manual (Page 85)

BigStuff3 Pro SEFI System (LS1)
Version 1.0 84
56. AE Position Correction
The second TPS transient fuel control table is AE Position Correction. It can be compared to a
carburetor’s accelerator pump “cam” profile. The ECU uses the AE Position Correction table
value to modify the size of the Asynchronous Pulse Width (APW) relative to the throttle position
at which the dTPSdt event occurred. For example, if a 10
o
/second dTPSdt event occurred
(resulting in a look up of 2.0 ms) at a 24% throttle position, the ECU would immediately look up
the corresponding AE Position correction value of let’s say -13%. The ECU will then decrease
the 2.0 ms pulse by 13% and output a 1.74 ms pulse. If the same 10
o
/second dTPSdt event
occurred at a 48% throttle position and the corresponding AE Position Correction value was -
31% the APW would then be 2.0 ms – 31% or 1.38 ms.
While the engine is running, a “real-time Ellipse” will move within the AE Position Correction
table relative to the current TPS % “operating point”. Use it as a point of reference to help
calibrate the AE Position Correction table.
To change a value in the AE Position Correction 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 greater the TPS %, the larger the AE Position Correction table value needs to be.
The inputs shown in the table below can be used as a baseline.
Working from left to right, each
cell equals a 1% change in throttle
angle up to 15
o
per second.