Description
The FiTech LS 750 HP EFI LS3 Intake w/ Returnless Module & Coil (78813) is engineered to streamline the process of upgrading or swapping LS engines. This comprehensive kit provides all the essential components for a high-performance fuel injection system, supporting up to 750 horsepower. It includes a short LS3 port intake manifold, an in-tank 340 LPH fuel pump module, LS3-style coil packs, and a user-friendly touchscreen controller. The system is designed for ease of installation and operation, featuring self-learning technology and compatibility with boosted applications.
KEY FEATURES AND BENEFITS:
- This master kit offers several key advantages for LS engine enthusiasts.
- Features multi-port fuel injection and timing control, enhancing engine performance and efficiency.
- The included in-tank fuel pump module ensures consistent fuel delivery.
- LS3-style coil packs provide reliable ignition.
- The system’s self-learning capability simplifies tuning.
- The touchscreen controller allows for easy adjustments.
- Compatibility for power adders like boost and nitrous oxide caters to a wide range of performance needs.
- The complete package, including the ECU, intake manifold, and fuel rails, provides a seamless installation experience.
SPECIFICATIONS:
- Maximum Horsepower: 750 HP
- Injection Style: Multi-port
- Timing Control: Yes
- Power Adder Compatible: Yes (Boost/Nitrous oxide)
- ECU Included: Yes
- Fuel Pump: In-tank 340 LPH
- Intake Manifold: Aluminum, Black Anodized
- Throttle Body: 102mm, GM LS2 4-bolt
- Injectors: 55 lbs/hr
- Metering Style: Speed density (MAP-N)
- Fuel Type: Alcohol, Gasoline, Methanol, Flex
HOW TO USE:
- Preparation: Ensure the LS engine is properly installed and ready for EFI conversion. Disconnect the battery.
- Fuel System Installation: Install the in-tank fuel pump module in the fuel tank. Connect the fuel lines to the fuel rails and regulator.
- Intake Manifold Installation: Mount the short LS3 port intake manifold onto the engine. Attach the 102mm throttle body.
- Electrical Connections: Connect the wiring harness to the ECU and engine sensors (MAP, IAT, TPS). Install the LS3-style coil packs and connect them to the harness.
- Sensor Installation: Install the oxygen sensor in the exhaust system. Connect the MAP, IAT, and TPS sensors to their respective ports.
- Controller Setup: Connect the touchscreen controller and mount it in a convenient location.
- Initial Setup: Power on the system and follow the on-screen instructions for initial setup and calibration.
- Fine Tuning: Utilize the self-learning feature and touchscreen controller to fine-tune the fuel and timing settings as needed.
- Testing: Start the engine and verify proper operation. Check for fuel leaks and ensure all sensors are functioning correctly.
BENEFITS OF USING THE FITECH LS 750 HP EFI LS3 INTAKE W/ RETURNLESS MODULE & COIL (78813):
- The FiTech 78813 simplifies LS engine swaps by providing a complete, ready-to-install fuel injection system.
- Self-learning technology minimizes the need for extensive tuning, allowing for quicker and easier setup.
- The system’s compatibility with boosted applications and various fuel types enhances its versatility.
- The included components, such as the in-tank fuel pump and LS3-style coil packs, ensure reliable performance.
FEATURES:
- Fabricated 3mm thick aluminum sheet metal intake, TIG welded.
- Cast, cable activated billet aluminum 102mm throttle body.
- Handheld controller with color touch screen and cable, plus windshield mount.
- Sequential fuel and spark control with individual cylinder trim.
- Connects to 24x and 58x cam sensors.
- Knock sensor control connects to factory sensors.
- 3-Bar MAP sensor for boosted applications up to 30 psi.
- Tach output driver works with most tachometers.
- Two programmable electric fan outputs.
- Supplied with WBO2 sensors.
- Custom wiring harness for a direct plug-in installation.
- High volume billet fuel rails.






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