Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 109)

BigStuff3 Pro SEFI System
Version 2.1 – February 2011 101
70. BigStuff3 Data Acquisition
As an option, the GEN3 ECU is capable of supporting both internal (internal to the GEN3 ECU) and
external (to a remote personal computer) data logging. The GEN3’s internal data logging eliminates
the need for a PC in the car!!
"Logging" files and "Replay" files are automatically saved to the BigComm folder. Logging files are
saved with a .csv suffix. Replay files are saved with a .csv (replay) suffix. When you look at the
BigComm folder using Windows Explorer, you can see both file types. When using the Replay
function and want to view a Replay file, the only files shown will be Replay (.csv replay) files. When
using the Logging function and want to view a Log file, the only files shown will be Log (.csv) files.
Logging vs. Replay
Logging
– A very basic data acquisition system that requires all data to be recorded to an external
source, thus requiring a PC in the car. Only base system engine operating parameters can be recorded.
The more parameters selected to be recorded, the slower the sample/transfer rate. Also, only the
parameters selected to be recorded are saved for future reference. The Logging feature is often used
and very useful for dyno tuning.
Replay
– The GEN3 “Replay” system ($200 upgrade) is an advanced data acquisition system that
records all engine and vehicle operating parameters internal into the GEN3 ECU. No PC is required in
the car! All base system operating parameters and any engine/vehicle operating parameters that are
part of GEN3 system upgrades are also recorded. The GEN3 ECU has 128k of on board RAM for
internal data logging up to 52 user selectable channels, twenty two (22) 16 bit channels & thirty (30) 8
bit channels), with 10-bit resolution. The system operated at a 50Hz acquisition rate, or 20 times per
second! Understanding that it takes about 150 milliseconds to slam the throttle to the flow, a 50Hz
acquisition rate is pretty good. All of the data recorded is available for future reference!
71. Logging (External)
This section, titled Logging, describes the external data-logging feature. The internal data-logging
feature, titled
Replay , is described in the following chapter.
The BigComm software allows the user to log data while the engine is running. The data is captured
by an external PC during the logging event and can be subsequently reviewed “On-Line” (connected to
the ECU) or “Off-Line” (PC only).
Note: The Dash for the Log Window needs to be configured so that all of the logged data is captured
and displayed in the Dash at the bottom of the Log window. Refer to the Dash/Logging procedure
outlined at end of the Logging section. Also see
Dashboard for information on how to configure other
Dashes.
From the tool bar on Main Menu screen, left click on “Logging”. The drop down screen below will
open.