GEN3 PRO SEFI System (LS1) System Hardware Installation & BigComm Software User Instruction Manual Revision 1.
BigStuff 3 Pro SEFI System (LS1) Table of Contents 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 Section Introduction Features Package Contents Main Wire Harness Installation Injector Wire Harness Installation Wide Band Oxygen Sensor Installation ECU Installation BigComm Software Overview BigComm Software Installation Communication Cable-to-PC Connection Using the Tool Bar Establishing a Connection BigComm Ma
BigStuff 3 Pro SEFI System (LS1) Table of Contents Continued 78 79 80 81 82 83 84 85 86 87 88 89 90 Chapter MAP AE Inc Rate Run Time Correction dMAP Parameters DTPSdt AE Position Correction Individual Cylinder Individual Cylinder – Spark Individual Cylinder – Fuel Boost Boost Parameters Boost PWM Boost Stage (spark) 1,2 & 3 Start Line Timing Learning Configure Learn Parameters Learning Display Table Dash Configure Dash Save a Dash Load from File Save to File Logging Configure Log Record Log View Log from
BigStuff 3 Pro SEFI System (LS1) 2. GEN3 PRO SEFI System Standard Features • Configurable Load & RPM axes to enable optimization in desired operating range • Capable of driving 16 low impedance injectors in a staged configuration. • “Wide Band Oxygen Sensor” (WB02) Air/Fuel Ratio (AFR) control to eliminate base engine and transient fuel calibration guesswork. • Capable of driving smart and dumb Coil-on-Plug (COP) ignitions with the stock sensors.
BigStuff 3 Pro SEFI System (LS1) GEN3 PRO SEFI System Optional Features • Transmission control (optional) for GM 4L60E/80E transmissions. • Dual (WB02) capable (optional) for individual bank closed loop control. • Onboard Data Logging (DAI) - 128k of on board RAM for internal data logging – 52 user selectable channels (twenty two (22) 16 bit channels & thirty (30) 8 bit channels), 10-bit resolution, with a 50Hz acquisition rate.
BigStuff3 Pro SEFI System (LS1) 3. Package Contents The BigStuff Engine Management System includes the following components: • • • • • • Black, powder coated aluminum Engine Control Unit (ECU) Main Wire Harness Injector Harness Wide-band Oxygen Sensor (handle with care!) Communication Cable CD ROM with BigComm user interface software and Instruction Manual Communications Cable Wide Band Oxygen (O2) Sensor BigStuff ECU Version 1.
BigStuff3 Pro SEFI System (LS1) 4. Main Wire Harness Installation To improve the overall wire harness installation process, the harness was manufactured with identification labels at the end of each wire or connector to ensure that connections are terminated correctly. The main wire harness has two halves; one half is intended to be located inside the vehicle, with the ECU, the other half connects to the sensors in the engine compartment.
BigStuff3 Pro SEFI System (LS1) Harness Label Calport Wire Color/Connector Type Black 3-way Packard connector with a purple seal Label Definition The calibration port that allows the ECU to interface with an external computer 2-Step Single yellow wire Tach Single green Wire HS GM FP Single lead Packard connector with a single red and white striped wire. Single lead Packard connector with a single black wire. High Side drive Fan Single lead Packard connector with a single red wire.
BigStuff3 Pro SEFI System (LS1) Wire Color/Connector Type Black 4-way connector with an orange seal Staged or PWM Boost Control LS1 Cam Black, 3-way Packard connector with a purple seal Camshaft Position Sensor Input H2O Black, 2-way Packard connector with a light blue seal. Gray, 2-way Packard connector with a light blue seal. Engine Cooling Fluid Temperature Input Engine Intake Air Temperature Input Harness Label Boost Air IAC TPS Black, 4-way Packard connector with a light blue seal.
BigStuff3 Pro SEFI System (LS1) Harness Label LS1 Coils Ground Wide Band O2 Main Fuse & Relay Vehicle Battery Fuse Header Connector Wire Color/Connector Type Label Definition Connect To Ground cable for LS1 Coil packs N/A Engine block or equally adequate ground location Connects to the Wide band O2 sensor.
BigStuff3 Pro SEFI System (LS1) Tach (Tachometer) – Green Wire This wire supplies a generic Tach “out” signal and will drive most traditional tachometers. A 4pulse per revolution, for a V8 engine, is outputted. Back_To_Tach High Side (HS) GM Fuel Pump (FP) – (Single lead Packard connector with a single red and white striped wire) This connector must go to the positive side of a fuel pump relay, not directly to the fuel pump.
BigStuff3 Pro SEFI System (LS1) Fan Control (engine cooling fan) – (Single lead Packard connector with a single red wire) This termination must go to the negative side of a fan relay, not directly to the fan. Terminating this connection directly to a fan will damage the BigStuff controller and will void the warranty! The fan connector is identical to the fuel pump connectors; so make sure the label is read to ensure the connector is terminated correctly.
BigStuff3 Pro SEFI System (LS1) Positive and Negative Battery Connections – (Four (4) 3/8” ring terminals. Two (2) red wire terminals and two (2) black wire terminals) THE MAIN WIRE HARNESS BATTERY CONNECTIONS NEED TO BE MADE TO THE POSITIVE AND NEGATIVE POSTS OF THE VEHICLE BATTERY TO ENSURE TROUBLE FREE OPERATION! The positive and negative battery cable lengths have been designed (are long enough) to accommodate a trunk-mounted battery.
BigStuff3 Pro SEFI System (LS1) H20 – (Black, 2-way Packard connector) This connector mates with a GM style coolant temperature sensor (front driver’s side cylinder head). Back_to_H2O Air – (Gray, 2-way Packard connector) This connector mates with a GM style air temperature sensor in the inlet duct between the air cleaner and the throttle body.
BigStuff3 Pro SEFI System (LS1) LS1 TPS Connector Pin-Out Goes To Late Model GM or Ford TPS Connector Pin-Out A B C 5 Volt Reference Ground Signal C A B Back_to_TPS MAP (Manifold Absolute Pressure) – (Black 3-way Packard connector) Connect to a LS1 style (0 to 1 BAR) Manifold Absolute Pressure (MAP) sensor located at the back of the manifold. For normally aspirated engines, a 1 bar sensor is used. For blown or turbocharged applications a 2 BAR MAP sensor must be used for boost pressures up to 15 PSI.
BigStuff3 Pro SEFI System (LS1) Connect the LS1 Coils Odd connector to the ignition coil pack connector on the odd fire (13-5-7) bank of the engine. Do the same for the even fire (2-4-6-8- ) bank of the engine. Securely fasten the LS1 Coils GND cable to the engine block or cylinder head! Back_to_Even_and_Odd_Coil_Connections Main Fuse & Relay WBO2 & Coil V-Batt Relay WBO2 & Coil V-Batt 30 Amp fuse Back_to_Main_Fuse_Relay ECU 3-Amp Fuse This fuse protects the ECU electronics.
BigStuff3 Pro SEFI System (LS1) 5. Injector Harness Installation – [Black, 10-way Packard Connectors (Male & Female)] Once the main harness is installed and all the connections to it are made, the injector harness can be installed and connected to the main harness. The standard injector harness is configured to work with an LS1firing order (1-8-7-2-6-5-4-3). The LS1 injector harness 10-way connector should be located at the rear of the engine.
BigStuff3 Pro SEFI System (LS1) The WBO2 sensor threads into the sensor mounting bung [(optional) (see picture below)], which needs to be drilled and welded into the exhaust pipe. Before drilling and welding read the design guidelines below. • • • Install mounting bung approximately 8” – 12” from where the primary pipes enter the exhaust collector. Make sure the mounting location selected does not allow condensation to collect directly in front of the sensor.
BigStuff3 Pro SEFI System (LS1) 7. ECU Installation The ECU must be installed in the passenger compartment! The ECU has four ¼-20 x ½” threaded isolation grommets threaded into the bottom of the housing. Once installed, connect the two (2) 30-way main wire harness header connectors to the ECU. Note: If the factory installed isolation grommets are not used to mount the ECU, threads into the housing cannot extend beyond the ¼” factory installed depth.
BigStuff3 Pro SEFI System (LS1) Engine calibrations are best performed on a dynamometer. If the user elects to calibrate the engine in the vehicle, BigStuff3 strongly recommends that two people are involved, one person to drive the vehicle, the other operate the laptop computer. 9. BigComm Software Installation The GEN3 system is supplied with a CD ROM software Disc and a 5’communication cable, which connects the BigStuff3 ECU with a personal computer (PC). A 25’ cable is also available.
BigStuff3 Pro SEFI System (LS1) The following screen will automatically open. Click the left mouse button on Next>. The following screen will open. The BigComm software must to be installed in the Windows Program Files Directory! The BigStuff3, BigComm software must be installed in the Window’s “Program Files” folder as shown above. Click the left mouse button on Next>. The following screen will open. Version 1.
BigStuff3 Pro SEFI System (LS1) Click the left mouse button on Next>. The following screen will open. Click the left mouse button on Next>. The following screen will open. Version 1.
BigStuff3 Pro SEFI System (LS1) Once 100% is reached, the following screen will open. To launch the BigComm software, check the box titled “Yes, Launch the program file.” Otherwise, click the left mouse button on “Finish.” The BigComm software has now been successfully installed on your personal computer! The following screen will open automatically. This screen provides the option to drag the BigComm shortcut icon to the Windows desktop. Minimize all open windows until the Windows desktop Version 1.
BigStuff3 Pro SEFI System (LS1) appears. Drag the BigComm shortcut icon onto the desktop. The BigComm icon allows for quick access to the BigComm software from the Windows desktop. BigComm shortcut icon 10. Communication Cable-to-PC Connection Using the communication cable supplied with the system, connect the 3-way Packard connector to the mating half 3-way connector marked CalPort on the Main Wire Harness. Connect the RS232 connector to the back of the personal computer.
BigStuff3 Pro SEFI System (LS1) pin-to-9 pin serial adapters are readily available at Radio Shack or comparable stores. Radio Shack’s USB port to 9-pin serial adapter is part number 26-183 (+/-$40.00). Prior to establishing communication with the GEN3 ECU, the PC’s COM port, needs to be selected. In order to complete the PC COM port selection a quick overview of the Tool Bar is required. The configuration tables within the BigComm software are accessed using the BigComm Tool Bar explained below. 11.
BigStuff3 Pro SEFI System (LS1) Select another Com Port until an available port is identified. Once the PC identifies an available Com Port, the following screen will appear. Press the PC’s “Enter” key or left mouse click on Yes and the Com Port will resynchronize. Next, double click the left mouse button on the BigComm short cut icon located on the Windows desktop. BigComm desktop icon The BigComm software will attempt to establish a connection between the PC and the GEN3 ECU.
BigStuff3 Pro SEFI System (LS1) If the GEN3 ECU is not powered up (the ignition key is not in the “Run” position) and the Communications cable is not connected, communication cannot be established. The following screen will appear. This may also occur if the Comm Port is not configured correctly. If this occurs, use the above process of configuring the Comm Port until communication is established. Left mouse click the Work Offline button.
BigStuff3 Pro SEFI System (LS1) Left mouse click on Yes and the BigComm software should go to the BigComm folder. If the PC does not automatically take you to the BigComm folder, navigate to C: Program Files/BigStuff/BigComm. Double left click on the calibration to be used for “off-line” modifications and the calibration will be loaded. After the calibration is loaded, the Main BigComm window will open. Version 1.
BigStuff3 Pro SEFI System (LS1) 12. Establishing a Connection The sequence for connecting the GEN3 ECU to the Main Wire Harness is as follows: • First connect battery terminals. • With the ignition switched off, connect the 30-way header connector, with terminals A-K to the ECU. • After terminals A-K are connected to the ECU, connect the header connector with terminals L-Y. This assembly sequence should preserve the firmware and initial calibration that was loaded in at the factory.
BigStuff3 Pro SEFI System (LS1) 13. BigComm Main Menu Screen View logged data short cut Fuel Table short cut Air/Fuel ratio table short cut Record Log short cut Spark Table short cut The engine is not yet ready to be started. A few additional items need to be completed before attempting to do so! In most cases, the ECU will be delivered with a calibration that will closely match your engine configuration. This “base calibration” will allow the engine to be started and run.
BigStuff3 Pro SEFI System (LS1) 16. Configuration The BigStuff3 ECU needs to be configured to the engine it will control. For example, the ECU needs to know if it is operating a 4, 6 or 8 cylinder engine along with other important engine parameters and variables. The initial configuration steps can be accomplished with the vehicle ignition key in “run” position and the engine off. The ECU must be supplied with 8V – 14V for the ECU to be “live”.
BigStuff3 Pro SEFI System (LS1) Main Configuration Table The Hardware Configuration’s Main Configuration table is relatively self-explanatory. Working from the top of the table, select the parameters shown in the screen print above as follows: • • • • • • • • Select the number of cylinders the engine has. Select whether system will operate using a speed density (engine speed and engine load) or Alpha N (throttle angle and engine speed) algorithm.
BigStuff3 Pro SEFI System (LS1) 18. Operating Configuration (F5 – “Quick Key”) Next, the system “Operating Configuration” needs to be set up. From the Main Menu screen Tool Bar, left click on “Configuration.” Keep the left mouse button depressed and slide the mouse pointer down until “Operating Configuration” is highlighted. Release the left mouse button. The screen below will open. The paragraphs below outline how each operating parameter should be configured.
BigStuff3 Pro SEFI System (LS1) TPS Configuration This input screen allows the user to set: • The TPS sensor to the correct output voltage when the throttle is completely closed. • The Clear Flood TPS %, described later in this section. Note: It is important to have the TPS (%) setup correctly.
BigStuff3 Pro SEFI System (LS1) RPM inputs, so that the engine has a small band (hysteresis) between the rev limiter on and off limits. Note: The engine may not run if there is no band between the On and Off limits or the RPM inputs are reversed! For example, if the “Rev Limit On” is set for 7,100 RPM and the “Rev Limit Off” is set at 7,300 RPM the engine will not run.
BigStuff3 Pro SEFI System (LS1) Crank Shaft (Pulse/rev) This input screen allows the user to set the quantity of teeth on the crankshaft. Return_to_Pickup_Wheels Coil-On-Plug (COP) Crank Reference Setting To realize the full benefits of the GEN3’s precise timing and individual cylinder control, Top Dead Center (TDC) for cylinder 1 (compression stroke) needs to be determined and marked on the dampener. Finding TDC TDC is the point at which the number 1 piston reaches its uppermost position in the cylinder.
BigStuff3 Pro SEFI System (LS1) Setting the LS1 Crank Reference Now that TDC for the number one (1) cylinder (compression) has been determined, the next step is to determine the 1st crank falling edge after the cam falling edge. A voltmeter is required to perform this task. A crankshaft degree wheel is also recommended. The following paragraphs outline the process steps. • Roll the crankshaft back 30o Before Top Dead Center (BTDC).
BigStuff3 Pro SEFI System (LS1) • • • • • • • • Rotate the crankshaft back to 30o BTDC position and the voltmeter attached to the E3 and J2 terminals, the voltmeter should read 12 Volts (the Switched 12-Volt wire on the main harness must be is connected and “live”). Very slowly, rotate the crankshaft clockwise towards TDC. As soon as the voltmeter reading drops to zero Volts (or very close to zero Volts) stop rotating the crankshaft.
BigStuff3 Pro SEFI System (LS1) An example of a default table, supplied with the system, is shown below. This is the same table as is shown above with the window maximized. Version 1.
BigStuff3 Pro SEFI System (LS1) 20. Load vs. RPM The BigStuff3 GEN3 SEFI system offers configurable Load & RPM axes! This feature is not available on any other comparably priced systems! Version 1.
BigStuff3 Pro SEFI System (LS1) This feature allows the user to configure the X axis (RPM) and Y Axis (Load), so that a majority of the available16 cell by 16 cell fuel and spark map area is available for calibrating. Systems with fixed X & Y axes allow only a small portion of the available map area to be used to calibrate the fuel and spark needs of the engine. This capability is extremely important if the engine is fuel or spark sensitive at a given load and/or RPM.
BigStuff3 Pro SEFI System (LS1) Cell Number 16 Y-Axis X-Axis Cell 1 Scaled RPM Axis (X- Axis) Scaled Load Axis (Y-Axis) “Scaled” RPM inputs from this table define the RPM break points used in the following tables, to name a few, which are described later in this manual!!! • Dwell Time Table • Injector Phase Angle (degree) Table • Boost Spark (retard) Table • Starting Line Timing Table Version 1.
BigStuff3 Pro SEFI System (LS1) The following table offers default Load schedules for 1, 2, 3, & 5 BAR MAP sensor applications.
BigStuff3 Pro SEFI System (LS1) 21. Firing Order Once the Load and RPM axes have been configured, go back to the Configuration on the Tool Bar. Left click on the “Configuration” and the drop down screen will open. Keep the left mouse button depressed and slide the mouse pointer down until “Firing Order” is highlighted. Release the left mouse button. The screen below will open.
BigStuff3 Pro SEFI System (LS1) The purpose of this table is to allow the user to configure the ECU to maintain a constant injector flow rate with varying battery voltages. Fuel injectors have a minimum pulse width (in milliseconds) required before they will open and let fuel flow. For example, with a constant battery voltage of 13.4V, a 60 lb/hr. Bosch injector is not likely to open until the ECU sends a pulse width command of 1.4 to 1.
BigStuff3 Pro SEFI System (LS1) Note: The RPM values, at the bottom of the table, are from the Load vs. RPM Axis drop down accessible from the Configuration tab from the Main Menu screen. Same screen print as is shown above with window maximized. Version 1.
BigStuff3 Pro SEFI System (LS1) You have now reached a milestone! The following necessary tasks have been completed: • • • The BigComm software has been installed Communication with the ECU has been established. The hardware and operating parameters have been configured. The following sections of the manual will outline how to use the Air/Fuel Ratio table, O2 Correction tables and the Fuel Table. Calibrating the engine for steady state operation is an iterative process using these tables.
BigStuff3 Pro SEFI System (LS1) 24. AIR FUEL RATIO (F11 – (“Quick Key”) Use the air/fuel icon to quickly access the air/fuel ratio table. The F11 “Quick Key” can also be used. 25. Air Fuel Ratio Table Note: In most cases, the ECU shipped with your system will come pre-configured with a table, which will closely match your engine configuration. The air fuel ratio table below allows the user to input desired air/fuel ratios for sixteen (16) engine speed (RPM) and 8 load (MAP or TPS) combinations.
BigStuff3 Pro SEFI System (LS1) • • • Fill – Choosing “Fill” will open a secondary drop down- screen which allows the selected cells to be changed to the value inputted into the window. Multiply – Choosing “Multiply” will open a secondary drop down-screen which allows the values of the selected cells to be changed by the ” Multiply” value inputted into the window. For example, if the values in the cells selected are 13 and the inputted “Multiply” value was 80, the new cell values would be 10.4.
BigStuff3 Pro SEFI System (LS1) Cell Values Selected in a Column 13 13 14 13.9 Interpolated Result from Cell Values Selected Above 13 13.3 13.6 13.
BigStuff3 Pro SEFI System (LS1) LOAD Normally Aspirated Street Engine 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.5 14.6 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.7 14.
BigStuff3 Pro SEFI System (LS1) LOAD Turbocharged Engine (30 PSI) 13.1 13.1 13.1 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 11.5 13.5 13.5 13.5 11.75 11.75 11.75 11.75 11.75 11.75 11.75 11.75 11.75 11.75 11.75 11.75 11.75 14 14 14 12 12 12 12 12 12 12 12 12 12 12 12 12 14.5 14.5 14.5 12.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 13.5 14.5 14.5 14.5 13 13 13 13 13 13 13 13 13 13 13 13 13 14.5 14.
BigStuff3 Pro SEFI System (LS1) corresponds to the bottom row in the air/fuel ratio table and the cell all the way to the right corresponds to the top row of the air/fuel ratio table. The user input values in the Positive O2 Correction table need to be positive numbers and the input values for the Negative O2 Correction table need to be negative numbers as shown in each table. To make changes to the values in these tables, use the left or right arrow keys to move the cursor to the cell to be changed.
BigStuff3 Pro SEFI System (LS1) 28. View Lambda (F2 – “Quick Key”) The View Lambda allows the user to view the current Lambda status in a large LED-like format. The window can be expanded or contracted by locating the mouse cursor at the edge of the window. The cursor will change shape from an arrow with one (1) point, two an arrow with points on both ends. When the cursor is in the two-point mode, hold the left mouse button down and pull the edge of the window in or out to expand or contract the window.
BigStuff3 Pro SEFI System (LS1) 29. AFR Parameters (F11 – “Quick Key”) The Air/Fuel Ratio (AFR) Parameters table allows the user to configure control parameters associated with closed loop fuel control, using the WBO2 sensor. The following paragraphs will describe the function of each control parameter. RPM On & RPM Off Inputs • RPM On – Defines the RPM the engine needs to exceed before the ECU will allow the system to go into closed loop fuel control using the O2 sensor.
BigStuff3 Pro SEFI System (LS1) 30. SPARK (F4 – “Quick Key”) There are several ways to access the base Spark table. The quickest methods are to hit the F4 “Quick Key” or left mouse click on the Spark Table icon, accessible from the main BigComm Screen. The Main Tool Bar can also be used to access the Spark table. From the Main BigComm software screen tool bar left click on Spark and the drop down screen will open. Spark Table Icon Spark table short cut icon Version 1.
BigStuff3 Pro SEFI System (LS1) 31. Spark Table The ellipse will move throughout the Spark table relative to the current RPM & Load “operating point” The Spark table uses actual timing values in each of the 256 cells in the table. The Spark table allows the user to input Spark values for sixteen- (16) engine speed (RPM) and sixteen (16) load (MAP or TPS) combinations.
BigStuff3 Pro SEFI System (LS1) • • • Fill – Choosing “Fill” will open a secondary drop down- screen which allows the selected cells to be changed to the value inputted into the window. Multiply – Choosing “Multiply” will open a secondary drop down-screen which allows the values of the selected cells to be changed by the ” Multiply” value inputted into the window. For example, if the values in the cells selected are 13 and the inputted “Multiply” value was 80, the new cell values would be 10.4.
BigStuff3 Pro SEFI System (LS1) Cell Values Selected in a Column 27.8 30.5 32 33 Interpolated Result from Cell Values Selected Above 27.8 29.5 31.
BigStuff3 Pro SEFI System (LS1) The BigComm software allows the user to configure the Load (MAP) and RPM axes allowing for a larger number of cells (map area) to be used for the fuel and spark tables. 32. FUEL (F3 – “Quick Key”) There are several ways to access the base Fuel table. The quickest methods are to hit the F3 key or left mouse click on the Fuel Table icon, accessible from the main BigComm Screen. The Main Tool Bar can also be used to access the “Fuel” table.
BigStuff3 Pro SEFI System (LS1) Fuel table drop down screen accessed from the Main Tool Bar Fuel Table Icon Using the PC’s mouse, keep the left mouse button depressed and slide the mouse pointer down until “Fuel Table” is highlighted. Release the left mouse button. The screen below will open. 33.
BigStuff3 Pro SEFI System (LS1) The Fuel table uses Volumetric Efficiency (VE) values in each of the 256 cells in the table. Volumetric Efficiency is the measure for how efficient the engine is operating at a given engine speed and load combination. The efficiency of the engine is nearly perfect at a value of 100. Volumetric Efficiency (VE) is highest at peak torque.
BigStuff3 Pro SEFI System (LS1) • Interpolate – If a series of cells in the same row are selected and the “Interpolate” “cellfill” option is selected the ECU will use the value in the cell all the way to the left and the cell value all the way to the right and interpolate the numbers in between so that the values are linear.
BigStuff3 Pro SEFI System (LS1) The illustration below shows the areas of the base fuel map that the ECU accesses under different driving conditions. Hint: Use the 02% Correction feedback in the Dash to help calibrate the Fuel table VE values. The BigComm software allows the user to configure the Load (MAP) and RPM axes allowing for a larger number of cells (map area) to be used for the fuel and spark tables.
BigStuff3 Pro SEFI System (LS1) The sequence of events the ECU steps through during an engine “start” are defined, in order, in the next four sections as follows: • • • • Cranking After Start Delay After Start Correction (adding fuel) After Start Decay 35. Cranking (F1 – “Quick Key”) The inputs in this table are only used by the ECU when the engine is in the cranking mode (< 400 RPM). The Cranking table allows the user to input the actual pulse width the injectors will operate at during engine cranking.
BigStuff3 Pro SEFI System (LS1) While the engine is cranking, a “real-time Ellipse” will move within the Cranking table relative to the current engine coolant temperature “operating point”. Use it as a point of reference to help calibrate the Cranking table. To change a value in the Cranking 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.
BigStuff3 Pro SEFI System (LS1) 37. After Start Correction As outlined above, the ECU delays the introduction of After Start Correction fuel once the engine starts. The table below allows the user to define the amount of After Start Correction fuel to be added as a function of coolant temperature. The After Start Correction fuel is added synchronously as a percent (%) of the base pulse width (defined in the Fuel table).
BigStuff3 Pro SEFI System (LS1) 38. After Start Decay The After Start Correction fuel being added by the ECU during an engine starting routine is only required for a very short period of time. The ECU pulls the fuel back out, or decays it, as a function of crankshaft interrupts and coolant temperature. The ECU decays the After Start Correction Fuel over the number of interrupts, depending on the temperature the engine is currently operating at, defined in the After Start Decay table.
BigStuff3 Pro SEFI System (LS1) 39. Idle The “Idle” drop down offers the user five tables to calibrate the engine idle quality. Each input table will be described in the paragraphs below. To get to the Idle drop down screen, go to the main Tool Bar and left click on Idle and the screen below will appear. Hold the left mouse down and drag it to the desired input screen and release the mouse button. Version 1.
BigStuff3 Pro SEFI System (LS1) 40. Throttle Follower Throttle bodies used with electronic fuel injection systems have an air by-pass channel molded or machined into the valve body to allow air to be bypassed around the throttle blades when they are fully closed. The air entering the engine through the bypass channel is used to control the engine idle speed. The amount of air needed to maintain a desired engine speed varies depending on engine coolant temperature, camshaft overlap, etc.
BigStuff3 Pro SEFI System (LS1) 41. Desired Idle RPM The Desired Idle Rpm table allows the user to set the desired engine RPM as a function of coolant temperature. To configure the table, input the desired engine RPM for the each temperature shown at the bottom of the table. The ECU controls the idle speed so transitions between temperature ranges are not noticeable. Note: The TPS needs to be set properly for this input to function properly. See TPS_Configuration for further assistance.
BigStuff3 Pro SEFI System (LS1) The bi-directional input table allows the user to quickly advance the timing (left side of the input table) when the RPM begins falling below the “Desired RPM” setting. Once the timing is advanced it needs to be retarded (right side of the input table) as the engine RPM begins increasing. The zero point in the table is equal to the user defined, “Desired” RPM.
BigStuff3 Pro SEFI System (LS1) The “position” values shown in the table below can be used as a baseline for most applications. You can see from the large values in the table that when the coolant temperature is cold, the IAC seeks a position in the direction of the fully open position (position number 180). As the engine reaches normal operating temperature, the IAC finds the position that allows the engine to idle at the user prescribed “Desired” idle speed.
BigStuff3 Pro SEFI System (LS1) 45. Warm Up Before the engine reaches normal operating temperature, i.e. 180o additional fuel is required as a function of engine coolant temperature and manifold absolute pressure (for speed-density applications). To calibrate “warm up enrichment” fuel go to the Main Tool bar and highlight “Warm Up.” Keep the left mouse button depressed and slide the cursor down to select Coolant Correction or Air Temperature Correction, depending on the table to be accessed. 46.
BigStuff3 Pro SEFI System (LS1) The inputs shown in the table below can be used as a baseline. 47. MAP Vs. Coolant The GEN3 ECU’s MAP vs. Coolant table offers an improved warm up routine. The table applies a fuel correction (a % increase or decrease to the base pulse width) as a function of both Load (MAP) and coolant temperature. The cells in the table represent ninety six (96) different MAP and coolant temperature combinations.
BigStuff3 Pro SEFI System (LS1) The values in the X & Y axes are factory set and therefore not configurable. Same screen as above with the window maximized. The values shown in the table below can be used as baseline. 48. TRANSIENT FUEL Transient Fuel is the fuel added to the engine during non-steady state conditions as a function of dTPSdt and dMAPdt. Transient Fuel is applied relative to a rate of throttle change (dTPS) and a rate of MAP change (dMAP). TPS transient fuel is added asynchronously.
BigStuff3 Pro SEFI System (LS1) MAP Transient Fuel: MAP (+) Transient Fuel can be compared to a carburetor’s power valve. It is used to increase the base fuel pulse width when the manifold pressure increases significantly for a slight change in throttle opening. MAP (-) Transient Fuel is used to decrease the base fuel pulse width when the manifold pressure decreases significantly as a result of the throttle blades being closed.
BigStuff3 Pro SEFI System (LS1) To change a value in the dMAP 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. 50. dMAP RPM Modifier (F10 – “Quick Key”) The second table used to calibrate the MAP Transient Fuel is the dMAP RPM Modifier table. Inputs to the table are used to increase or decrease the dMAP correction as a function of engine RPM.
BigStuff3 Pro SEFI System (LS1) Same screen as above with the window maximized. 51. MAP AE Decay Rate The third table is MAP AE Decay rate. It is used to determine how quickly to decrease the Positive dMAP correction value after accelerating the engine at a given coolant temperature. The ECU decrements the dMAP correction by the MAP AE Decay Rate. A MAP AE Decay Rate of 3 represents 3 crank interrupts per 1 step decrease of the dMAP Correction until it reaches zero.
BigStuff3 Pro SEFI System (LS1) 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.
BigStuff3 Pro SEFI System (LS1) 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.
BigStuff3 Pro SEFI System (LS1) To change a value in the Run Time 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 inputs shown in the table below can be used as a baseline. 54. dMAP Parameters The Secondary Transient Fuel table is dMAP Parameter Configuration. This table is used to control auxiliary MAP and TPS transient and base fuel functions.
BigStuff3 Pro SEFI System (LS1) falling below a MAP value of 30 kPa, with the throttle closed. The Base Fuel Map pulse width is turned back on based upon the DCFO Off value (see DCFO Off). • DCFO Off: Establishes the MAP value in kPa at which the Base Fuel Map pulse width is re-enabled. It is used to calibrate deceleration drivability. Typically, the DCFO Off value is set to 5 kPa above the DCFO On value. For example, if the DCFO On value is set to 30 kPa the DCFO Off value should be set to 35 kPa.
BigStuff3 Pro SEFI System (LS1) relative to a rate of throttle change (dTPSdt). The asynchronous pulse can be modified relative to the throttle position where the acceleration event occurred (AE Position Correction). Below, is a description of how the TPS Transient Fuel requirements are calibrated using the dTPSdt and AE Position Correction tables. 55. dTPSdt The first TPS Transient Fuel control table is dTPSdt. It can be compared to a carburetor’s accelerator pump shot.
BigStuff3 Pro SEFI System (LS1) Working from left to right, each cell equals a 1% change in throttl angle up to 15o per second. 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.
BigStuff3 Pro SEFI System (LS1) 57. Individual Cylinder This feature allows the user to define the amount of fuel (positive and negative) and spark advance/retard correction for each cylinder. This feature is used to “calibrate out” intake manifold inefficiencies. From the Main Menu screen Tool Bar, left click on “Individual Cylinder.” The screen below will open. The following paragraphs will describe how to calibrate each of the Individual Cylinder drop down selections. Version 1.
BigStuff3 Pro SEFI System (LS1) 58. Individual Cylinder - Spark The fixed inputs in the table below represent the firing order configured during the firing order configuration process (Firing_Order_Config). The input cells allow the user to define the amount of timing advance or retard (up to 10o) for or each cylinder in the table. Timing corrections are made to the values in the Spark Table.
BigStuff3 Pro SEFI System (LS1) 60. Boost The GEN3 ECU allows the user to control boost parameters. Two boost strategies can be employed. 1. A Pulse Width Modulated (PWM) valve can be used to control boost as a function of engine RPM. The duty cycle of the valve can be changed as a function of engine speed. 2. A “staged” boost strategy can also be used. Up to three stages of boost can be switched on (using solenoid valves) in a user defined, timed sequence.
BigStuff3 Pro SEFI System (LS1) Keep the left mouse button depressed and slide the mouse pointer down until “Boost Parameters” is highlighted. Release the left mouse button. The screen below will open. 61. Boost Parameters The GEN3 ECU allows the user to control boost parameters in two (2) modes; Staged or Pulse Width Modulated (PWM). Version 1.
BigStuff3 Pro SEFI System (LS1) Staged mode turns on boost stages (solenoid valves) in a user defined, time sequence. PWM mode assumes the boost system is configured with a PWM boost valve. When the PWM mode is enabled the Stage 1 – 3 timer input windows are made inactive, as shown in the screen print above. When Staged mode is selected, the Stage Timer input windows are active as shown in the screen print below. .
BigStuff3 Pro SEFI System (LS1) Same as screen above with window maximized. To change a value in the Boost PWM 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. 63. Boost Staged When “Staged” mode is selected the time intervals between the boost stages need to be configured. In the Boost Parameters table above, these inputs are defined as Stage 1, Stage 2 and Stage 3.
BigStuff3 Pro SEFI System (LS1) the Timer Enable pin, which is Pin A of the 4-way Boost connector on the main wire harness Boost_Connector_Pin_Out. A clutch switch or trans brake button should be wired between the timer enable pin and a 12-volt source. A toggle switch can be added between the 12V source and the clutch switch or transmission brake button to allow the timer enable pin to be turned on and off.
BigStuff3 Pro SEFI System (LS1) How to Use With Stick Shift Cars - For stick shift cars, the ignition timing needs to be retarded in order for the engine to build boost at the starting line (with the clutch in). If this feature is used with the 2-Step, make sure that Boost_Parameters RPM input is set 1,500 RPM below the 2-Step RPM enable point. Once the Boost Parameters TPS and RPM criteria are satisfied the ECU will use the timing values from the Starting Line Timing table.
BigStuff3 Pro SEFI System (LS1) 65. Learning The primary function of the Learning feature is to minimize the amount of O2 correction required to achieve the user defined values in the air/fuel ratio table. If learning is enabled, the ECU monitors the % O2 correction. If the % O2 of correction is equal to or greater than 5%, the ECU begins to Learn.
BigStuff3 Pro SEFI System (LS1) Enable/Disable Learning - To enable or disable Learning, left mouse click the appropriate button. Learning Parameters – Assuming “Learning Enabled” was selected, the following parameters need to be set. • • Positive & Negative Limit – The correction limit (+/-25%) that the ECU will allow the Learning function to modify the base fuel table values.
BigStuff3 Pro SEFI System (LS1) When the user defined delay limit is reached, the active cell (the cell the engine is operating in) in the Learning Display Table cell turns green to signify the Learning mode is active. While the cell is green, the ECU drives the O2 correction to within +/-5% of the base fuel value then turns the cell red to signify the learning has stopped.
BigStuff3 Pro SEFI System (LS1) Release the left mouse button. The screen below will open. Left Click on the “Pick Dash” drop down screen. Pick Dash drop down screen The screen below will appear. Version 1.
BigStuff3 Pro SEFI System (LS1) This is the list of thirty-one (31) available Dashboards. Once configured, these Dashboards will show up at the bottom of the corresponding operating screens. After selecting a Dash to configure, “Signals” need to be selected and added to the Dash. After the Signals are selected, added and saved, they will be displayed in the Dash at the bottom of the relevant BigComm software screens. The left side of the drop down screen below shows the “Available Signals”.
BigStuff3 Pro SEFI System (LS1) Signal in the Dash Cranking Fuel Dash Available Signals In the screen print below notice that the same “Signals” appear in the Dash at the bottom of the Cranking Fuel screen. Cranking Fuel Dash 70. Save a Dash Again, the recommended way to configure the “Default Dash” is to configure each of available dash’s, or most frequently used dash’s, to your liking and then save them as the “Default Dash”.
BigStuff3 Pro SEFI System (LS1) Once the “Default Dash” has been saved, individual dash’s can be changed and saved again as part of the compilation of dash’s referred to as the “Default Dash”. The steps for saving a reconfigured Dash, so that it becomes part of the “Default Dash”, are outlined below: • • After configuring a Dash hit OK at the bottom of the Dash Setup window. The window will close. Go back to Dash on the Main Window tool bar and Select Save To File from the Dash drop down list.
BigStuff3 Pro SEFI System (LS1) 71. Load From File In addition to the “Default Dash” unique dash’s can be configured and used, e.g. Turbo Car dash. To view a previously saved unique dash, go to Dash on the Main Menu screen. Left mouse click on Dash and slide the cursor down to “Load from File”. Release the left mouse button and the following screen will open with a message that reads, “This will destroy your current Dash setting.” “Do you want to continue”? Version 1.
BigStuff3 Pro SEFI System (LS1) Select “Yes”. The screen below will open. All the previously saved log files will be listed. Select the file to be opened by double clicking the left mouse button. The selected logged file will open. The next time the BigComm software is opened it will automatically load and run the “Default Dash” compilation, while retaining your unique dash in the C: Program Files/BigStuff/BigComm folder. 72.
BigStuff3 Pro SEFI System (LS1) Release the left mouse button and the following screen will open. Name the Dash to be saved in the “File Name” sub-window and hit Save. The dash will be saved. Version 1.
BigStuff3 Pro SEFI System (LS1) 73. Logging (External) 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!! This section, titled Logging, describes the external data-logging feature. The internal datalogging feature, titled Replay, is described in the following chapter.
BigStuff3 Pro SEFI System (LS1) • • Record Log – Starts logging data. View Log From File - View logged data from a user defined file name. The logging options are further explained below. 74. Configure Log From the tool bar on Main Menu screen, left click on the “Logging”. When the drop down screen opens, hold the left mouse button down and slide the mouse until Configure Log is highlighted. Release the mouse button. The screen below will open.
BigStuff3 Pro SEFI System (LS1) automatically include number extensions for all subsequently saved files under the same default file name. Once the desired changes have been made, click OK at the bottom of the window. Your changes will be saved. 75. Record Log (F8 – “Quick Key”) The “Record Log” function is another way to initiate a data Logging event. To use this method, go to the tool bar on Main Menu screen and left click on “Logging”.
BigStuff3 Pro SEFI System (LS1) An example log screen is shown below. In this example, the Log Window Dashboard was setup to collect and display Scaled Load, Scaled RPM, TPS, V bat MAP, RPM, Spark Advance and Boost, as shown on the right side of the screen. The left and right arrow keys on the keyboard can be used to move horizontally across the logged data graph.
BigStuff3 Pro SEFI System (LS1) This window identifies the file name and location where the Logged Data was automatically store to Red (vertical) cursor line. The user can also “zoom- in” on a particular area of the logged data in the graph. To “zoom- in” on a particular area of the graph, depress and hold the left mouse button. Drag the mouse to cover the desired area. A red box is created around the selected area, as shown in the screen print below.
BigStuff3 Pro SEFI System (LS1) Red cursor line The left and right arrow keys on the keyboard can be used to move the red cursor line to display the actual engine operating parameters recorded at each point in the graph. Click the right mouse key to get back to original Log Window screen. 77. Dash/Logging procedure to record Data Log session 1. 2. 3. 4. Select Dash from the Main Window tool bar. Select Configure Dash from the Dash drop down list.
BigStuff3 Pro SEFI System (LS1) 12. Select the TPS Threshold (0 – 100% TPS), Log for (0 – 30 seconds) & Update Data While Logging (yes or no) settings. Next type in a Log File name and hit OK. Note: Once the initial Log File name is entered, the BigComm software automatically increments, with number extensions, and saves the subsequent Log Files, associated with the initial file name.
BigStuff3 Pro SEFI System (LS1) 78. Replay (Optional Feature) The GEN3 ECU’s optional internal data logging capability is called “Replay”. Replay eliminates the need to keep your PC in the car while going down the track. Replay is capable of sampling fifty-two (52) channels of data, fifty (50) times per second! In order to record data to the internal RAM, the Timer Enable pin, Pin A of the 4-way Boost connector on the main wire harness Boost_Connector_Pin_Out and the TPS threshold setting must be met.
BigStuff3 Pro SEFI System (LS1) Signals Displayed – Select the signals you would like logged and displayed by checking the box next to the desired signal. Check the “ALL OFF” or “ALL ON” toggles the bottom of the table to turn all the signals off or on respectively. Any signal checked will be logged and displayed. Replay Duration – The length of time the GEN3 ECU will log data, once initiated by the TPS Trigger Level setting. The data logging duration can be set from one (1) to eighteen (18) seconds.
BigStuff3 Pro SEFI System (LS1) Once 100% of the data has been transferred, a file is automatically written to the folder BigComm was originally installed in. Typically, the C: Program Files/BigStuff/BigComm directory. 81. View Replay From File Once data has been logged and transferred to a PC it can be viewed in the same way as externally Logged data. To view Replay (logged) data, go to Replay on the Main Menu bar. Left click on Replay and drag the mouse down until View Replay From File is highlighted.
BigStuff3 Pro SEFI System (LS1) Release the mouse button and the screen below will open showing the available Replay logged files. The file can also be accessed using the same method as externally logged files are accessed. The Trace function can also be used with Replay (internal data logger) logged files. For more information on how to use the Trace function go to the next chapter titled Calibrating_with_the_Trace_Function. 82.
BigStuff3 Pro SEFI System (LS1) The “Choose a Log File Screen” (shown above) will open and display the available, previously logged, files. Select and open the desired log file. Once opened, the Fuel or Spark table will turn yellow indicating that the Trace function is enabled. A trace line, representing the logged data file, will superimpose itself over the fuel or spark table. Note: Scaled RPM (Scld_RPM) and Scaled Load (Scld_Load) must be logged in order to support the “Trace” function. Version 1.
BigStuff3 Pro SEFI System (LS1) Blue Ellipse represents the logged data file engine operating points. A Blue Ellipse will appear along the trace line highlighting the logged engine operating points. To navigate the ellipse along the trace line, depress and hold the “Alt” key while simultaneously depressing the left or right arrow keys. As the blue Ellipse moves along the trace line, the logged engine operating parameters will be displayed in the Dash.
BigStuff3 Pro SEFI System (LS1) • • • Fill – Choosing “Fill” will open a secondary drop down- screen which allows the selected cells to be changed to the value inputted into the window. Multiply – Choosing “Multiply” will open a secondary drop down-screen which allows the values of the selected cells to be changed by the ” Multiply” value inputted into the window. For example, if the values in the cells selected are 13 and the inputted “Multiply” value was 80%, the new cell values would be 10.4.
BigStuff3 Pro SEFI System (LS1) The following screen will appear. Name the file, in this example Norwalk Calibration-2, and hit the PC’s “Enter” key or left click on the Save button. 85. Load Calibration To load a calibration file, previously saved to the PC’s hard drive or external disc, go through the steps above except select Load Calibration from the drop down screen. Note: The ECU must be powered ON to load a calibration file.
BigStuff3 Pro SEFI System (LS1) The following screen will appear listing all the available calibration files. In this example, only one calibration is listed (Mid-Michigan Calibration.big). Left click on the file (It will be highlighted in blue) and click Open. The following screen will open showing the status of the file loading. Once the file finishes loading, the selected calibration will be loaded into the GEN3 ECU. Version 1.
BigStuff3 Pro SEFI System (LS1) 86. Transmission (Optional Feature – Available August 2004) To set up, go to Gear_Box To set up, go to Gears To set up, go to Torque_Converter_Lockup To set up, go to Torque_Converter_Control Gear Box Select the type of transmission the GEN3 ECU will be controlling. Gears Select the number of gears the transmission has. The 4L60E and 4L80E transmissions have 4 forward speeds.
BigStuff3 Pro SEFI System (LS1) Torque Converter Delay (in seconds) – Once all other criteria are met the delay setting determines when to apply the clutch. 87. Acronym Definition BLM – Block Learn Modifier SEFI – Sequential Electronic Fuel Injection AFR – Air Fuel Ratio MPH – Mile Per Hour EMI – Electro-Magnetic Interference CD – Compact Disc ROM – Read Only Memory PC – Personal Computer WOT - Wide Open Throttle TCC - Torque Converter Clutch. APW – Asynchronous Pulse Width 88.
BigStuff3 Pro SEFI System (LS1) 91. ECU Pin-out ECU Pin A1 B1 C1 D1 E1 F1 G1 H1 Wire Name Map Signal - B TPS Signal – C Clt Temp Signal – A Air Temp Signal –A 5V 1 Stage 3 / Boost - D RUEGO H - WBO2 – 4 H.S.
