FAST EFI Systems

FAST EFI Systems

FAST, or Fuel Air Spark Technology, is a leading EFI system manufacturer that produces complete electronic fuel injection kits, throttle bodies, fuel injectors, intake manifolds, ignition controllers, and transmission controllers designed to help builders convert carbureted engines to modern fuel injection or upgrade existing EFI systems for significantly more power and tunability. As part of the Edelbrock Group family alongside COMP Cams and TCI Automotive, FAST benefits from decades of racing and street performance engineering experience that feeds into products tested in competition before reaching the aftermarket. The brand's self-learning EFI systems are the most popular entry point for small block Chevy, big block Chevy, and Mopar V8 owners converting from carbs who want fuel injection performance without extensive tuning knowledge, because the adaptive strategy programs the fuel map automatically during initial driving. Professional builders and race teams choose FAST XFI and EFI 2.0 systems for their advanced sequential injection strategies, individual cylinder trim, and datalogging capability.

Popular Upgrades

FAST's most popular products include the EZ-EFI 2.0 self-tuning fuel injection system for single four-barrel carb-replacement installs on small block Chevy, big block Chevy, Ford, and Mopar V8 engines that delivers reliable street fuel injection without professional tuning, the XFI 2.0 multi-port injection system for professional-grade builds requiring individual cylinder tuning and data acquisition, and FAST LSXr and LSX LS-series intake manifolds that significantly improve upper-rpm airflow on LS1, LS2, LS3, and LS6 engines compared to factory Corvette and truck intake castings. FAST throttle bodies in 92mm, 102mm, and 112mm configurations are popular standalone upgrades for builders who want improved airflow over factory throttle bodies on late-model EFI engines without a full system replacement.

Performance and Handling

A FAST EZ-EFI 2.0 conversion on a small block Chevy or Ford street rod typically produces 15 to 30 percent better fuel economy at part throttle compared to a correctly jetted carburetor while maintaining or exceeding carburetor peak power, making it one of the few upgrades that simultaneously improves efficiency and performance. The FAST LSXr intake manifold on an LS3 or LS2 improves peak power above 6000 rpm by 20 to 40 horsepower compared to stock manifolds due to its longer runner design that increases airflow velocity in the upper rpm range where the factory manifold becomes restrictive. A professional tune on a FAST XFI 2.0 system with individual cylinder trims and O2 feedback can optimize each cylinder's fuel delivery to correct any imbalance in the engine's ring seal, port flow, or injector delivery, improving both power and emissions simultaneously.

What is the best FAST EFI system for a carbureted street rod?

The FAST EZ-EFI 2.0 is the most recommended system for carbureted V8 street rod conversions because it uses a self-learning fuel control strategy that automatically builds a baseline fuel map over the first 50 to 100 miles of driving without requiring a laptop or dyno session, making it accessible to builders who want modern fuel injection reliability without professional tuning experience. The system includes a compatible intake manifold, throttle body, fuel pump, injectors, and wiring harness for a complete bolt-on conversion on common carbureted four-barrel engines. Advanced users can also connect a laptop to refine the map further once the self-learning baseline is established.

Does FAST make EFI for LS engines?

Yes, FAST produces the XFI 2.0 and several complete LS EFI management packages specifically for LS swaps and replacements in vehicles that did not originally have LS-based computers, including the popular LS XT standalone system that provides full sequential injection, coil-on-plug ignition, and drive-by-wire throttle body control without requiring factory GM modules. The FAST LSXr and LSX intake manifolds for Gen III and Gen IV LS platforms are also among the best-performing intake upgrades for naturally aspirated LS builds targeting maximum top-end horsepower. Builders doing LS swaps in classic cars and trucks frequently choose FAST management systems for their self-contained wiring and simplified LS integration compared to adapting factory ECMs.

Why These Parts Fit Right

FAST EFI products are listed by engine application, injection system type, throttle body diameter, and intake manifold cylinder head port match to confirm fitment before ordering. EZ-EFI system compatibility charts on product pages specify supported engine families and fuel pump requirements for a complete installation. Fast shipping and expert support are available for any FAST EFI system selection or application question.

Maximize the benefit of your EFI upgrade with products from our air intake systems collection, complete your build with upgrades from our exhaust collection, and improve chassis dynamics with parts from our suspension catalog.