Last month we covered a stout 388ci small-block combination that Vrbancic Brothers Racing in Ontario, California, assembled with pump gas power in mind. Details include, 9.7:1 compression, a set of RHS 200cc aluminum heads, an RHS single-plane intake manifold, and a fairly aggressive hydraulic roller camshaft (242/248-degrees of duration at 0.050). While we had our default goal of 500hp on pump fuel in mind, we'd be happy with anything over 450, and if it's like any of the other stroker small-blocks we covered this year, our 388 should be right in there. Unlike the carbureted strokers we dyno'd in the past year, we wanted to try something different on this combination, namely F.A.S.T.'s EZ-EFI system. We've heard great things about the self-learning technology and we were anxious to try it out in a controlled environment like Vrbancic's engine dyno.

Hooking up the system is almost as simple as installing a carburetor, with minimal connections required for operation, a handheld interface module, and with help from the Setup Wizard, it makes installing EFI on your engine easier than it's ever been. This setup is designed for engines up to 650 horsepower and the system guides the user through startup and operation; it literally tunes as you drive.

If you have a 4150-style intake manifold and you're looking to improve gas mileage or to improve your startup reliability, this is a great system. The setup comes with a high-flow throttle-body with injectors and rails installed, an ECU that features internal diagnostics, a palm-held tuning module, a fuel pressure regulator and in-line fuel pump and filter; the pre-terminated wiring harness also makes install a breeze.

EZ-EFI Tips

  • Make sure to position the ECU away from any electronics, such as spark plug wires, the coil, or anything that would produce noise that could confuse the system.
  • The system hooks up via AN-6 fuel lines so a variety of hoses and fittings this size is a must for install. F.A.S.T.'s Master Kit (PN 30227-KIT) supplies all the hoses and fittings needed in a complete kit.
  • The wide band O2 sensor should be installed within 1 foot downstream of the header or manifold collector.
  • According to F.A.S.T., the A/F targeting in the ECU is pre-set and self taught. For those that know what they are doing and are interested in adjusting the targets directly, the hand held advanced section allows for those fine adjustments. It's important to note that this is not necessary and strictly optional.