EFI Kit, Base, FiTech Retro-LS EFI, Gold Finish

FiTech Retro LS EFI System, GM LS V8, 650 HP, Gold, with Transmission Control

950 CFM throttle body EFI system with classic gold finish, self-tuning ECU and transmission control

Bring modern electronic fuel injection to your GM LS-series V8 while retaining the traditional appearance of a four-barrel carburetor with the FiTech Retro LS EFI system. Featuring a classic gold finish and 4150-style square-bore mounting flange, this throttle body injection system combines vintage styling with electronically controlled fuel delivery. Its 950 CFM cast aluminum throttle body incorporates four 44mm venturis and flow-matched 80 lb/hr injectors with annular fuel discharge for improved fuel atomization. Designed for engines producing 250–650 horsepower, the system features a self-learning ECU with semi-sequential fuel delivery and electronic ignition timing control. The Retro LS system includes a wiring harness, wideband oxygen sensor and full-color touchscreen controller for initial setup, operating monitoring and tuning adjustments without requiring a laptop. Integrated MAP, throttle position and idle air control sensors simplify installation, while compatibility with 24X and 58X crankshaft signal configurations accommodates a variety of LS engine applications. Built-in electronic transmission control supports compatible GM 4L60, 4L65 and 4L80 automatic transmissions. A compatible intake manifold with a 4150 square-bore mounting flange and a high-pressure fuel delivery system capable of supplying 58 PSI are required for installation.

Features • Genuine FiTech Retro LS EFI system, #37001 • Designed for compatible GM LS-series V8 engines • Supports engines producing 250–650 horsepower • Classic gold finish with traditional carburetor appearance • 950 CFM cast aluminum throttle body • Four 44mm throttle body venturis • 4150-style four-barrel square-bore mounting flange • Flow-matched 80 lb/hr fuel injectors • Annular fuel discharge for improved atomization • Self-learning ECU with semi-sequential fuel control • Electronic ignition timing and knock sensor control • Compatible with 24X and 58X crankshaft signal configurations • Integrated 1-bar MAP, TPS and IAC sensors • Includes full-color touchscreen tuning controller • Includes wideband oxygen sensor and wiring harness • Built-in control for compatible GM 4L60, 4L65 and 4L80 transmissions • Includes FiTech tight-fit fuel pressure regulator, #54000 • Requires a compatible 4150-flange intake manifold • Requires a separate high-pressure EFI fuel delivery system