Description
The FiTech Classic Black 650 HP EFI w/ Fuel Force Mini Surge Tank (35521) provides a straightforward electronic fuel injection (EFI) upgrade for engines previously using a 4-barrel carburetor. Designed for naturally aspirated engines up to 650 horsepower, this kit simplifies the transition to modern fuel injection without requiring complex tuning. The system includes the Force Fuel Mini delivery system, ensuring consistent fuel pressure and flow. The self-tuning ECU adapts to various driving conditions, providing improved engine performance and efficiency.
KEY FEATURES AND BENEFITS:
- Replaces 4-barrel carburetors with a modern EFI system.
- Self-tuning ECU adjusts for optimal performance.
- Force Fuel Mini system simplifies fuel delivery.
- Rated for engines up to 650 horsepower.
- Compatible with gasoline, alcohol, methanol, and flex fuel.
- Includes all necessary sensors and components.
- Maintains a classic carburetor appearance.
- Speed density (MAP-N) metering style.
- 950 CFM airflow rate.
SPECIFICATIONS:
- Maximum Horsepower: 650 HP
- Injection Style: Throttle body
- Timing Control: No
- Power Adder: No
- ECU: Included
- Fuel Pump: Included (external)
- Transmission Controller: No
- Metering Style: Speed density (MAP-N)
- Throttle Body Mounting Flange: 4-barrel square bore
- Venturi Diameter: 44 mm
- Airflow Rate: 950 CFM
- Injector Size: 80 lbs/hr
- Fuel Type: Alcohol, Gasoline, Methanol, Flex
HOW TO USE:
- Preparation: Remove the existing 4-barrel carburetor and associated fuel lines.
- Installation: Mount the FiTech 35521 throttle body onto the 4-barrel intake manifold.
- Fuel System Setup: Install the Force Fuel Mini system, connecting the fuel pump and filter.
- Sensor Installation: Connect the included MAP, IAT, TPS, and oxygen sensors.
- Wiring: Connect the wiring harness to the ECU and engine components, following the provided instructions.
- Initial Setup: Program the basic engine parameters into the ECU using the calibration module.
- Startup and Self-Tuning: Start the engine and allow the self-tuning ECU to adjust fuel parameters over time.
- Verification: Check for any leaks and verify proper engine operation.
BENEFITS OF USING THE FITECH CLASSIC BLACK 650 HP EFI W/ FUEL FORCE MINI SURGE TANK (35521):
- Improved cold starts and smoother engine operation.
- Enhanced fuel efficiency and performance.
- Simplified fuel delivery with the Force Fuel Mini system.
- Reduced need for manual carburetor adjustments.
- Modern EFI technology with classic appearance.
- Versatile fuel compatibility.
- Simplified installation when compared to other EFI systems.
FEATURES:
- Cast aluminum throttle body with black finish.
- 80 lbs/hr fuel injectors.
- External fuel pump with 340-LPH flow rate.
- 10-micron fuel filter.
- Included wiring harness and calibration module.
- Complete sensor package (MAP, IAT, TPS, oxygen).
- 4x 44mm venturis.





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