FiTech Fuel Injection Fuel Injection System

FiTech Fuel Injection Systems: Self-Tuning EFI for Every Build

When it comes to converting a carbureted engine to modern electronic fuel injection — or upgrading an existing EFI setup — few names in the aftermarket carry as much momentum as FiTech Fuel Injection. Their lineup of fuel injection systems is built on a straightforward premise: deliver OEM-grade engineering and software sophistication at a price point that makes EFI accessible to every enthusiast, from the weekend hot rodder to the serious power builder.

A Complete Range of Throttle Body EFI Systems

FiTech's fuel injection systems are throttle body-style units designed to be a bolt-on replacement for a traditional four-barrel carburetor. Their self-tuning technology means the ECU actively monitors and adjusts air/fuel ratios, ignition timing, and fuel delivery on the fly — no dyno required for initial setup. The product family spans an impressive power range:

• Go EFI 4 (600 HP) – The go-to entry point for most builds. Rated for engines from 200 to 650 horsepower, it features a built-in fuel pressure regulator and an on-throttle-body ECU for a clean, self-contained installation. It fits any standard 4-barrel intake manifold straight out of the box.
• Go EFI 4 Power Adder (600 HP) – Purpose-built for forced induction and nitrous applications, this system handles up to 25 lbs of boost and is compatible with turbo, blower, and single-stage wet nitrous setups.
• MeanStreet EFI (800 HP) – FiTech's street-oriented high-output system, featuring an onboard ECU and integrated fuel pressure regulator for simplified wiring and a cleaner engine bay.
• Go EFI 8 / Power Adder Plus (1,200 HP) – For the serious power builder. Eight high-flow injectors deliver enough fuel to support up to 1,200 horsepower, with full compatibility for boosted and nitrous-fed combinations.
• Go EFI 2x4 Dual-Quad (1,200 HP) – Designed for dual four-barrel manifolds, 671/871 Roots superchargers, and naturally aspirated dual-quad setups pushing up to 1,200 horsepower.
• Ultimate LS EFI Systems (500–750 HP) – Engineered specifically for GM LS engines including LS1/LS2/LS6 and LS3/L92 platforms, with options for integrated transmission control for seamless powertrain management.

What Sets FiTech EFI Systems Apart

The software powering every FiTech fuel injection system is developed to OEM-level standards, incorporating full diagnostics and limp-home modes — the kind of functionality typically reserved for factory engine management. A handheld touchscreen controller is included with each system, making initial calibration straightforward even for first-time EFI users. The ECU's adaptive learning continuously refines fuel tables as driving conditions change, eliminating the need for repeated manual tuning sessions.

FiTech systems also support a wide variety of fuel types and engine configurations, including E85 compatibility (with adjustments via the handheld controller), making them a versatile choice for builds that evolve over time. Whether the goal is a mild cruiser or a supercharged monster, FiTech's throttle body EFI lineup has a solution sized for the application.

Easy Installation, Serious Performance

One of the most praised aspects of FiTech fuel injection systems is how straightforward they are to install. Because the ECU mounts directly to the throttle body and a built-in fuel pressure regulator is standard, the wiring complexity is dramatically reduced compared to multi-component EFI systems. Pair any FiTech throttle body unit with their Fuel Command Center sump or inline fuel delivery kit for a complete, return-line-free conversion that requires minimal modification to the existing fuel system.