Holley EFI

Holley EFI is a top-notch choice for your next fuel injection conversion, especially if you’re an average hot-rodder. It’s a standalone EFI system that’s used on everything from stock engine street rods to 4000+ HP pro-mods.

Key features of the Holley EFI include:

  • Closed-loop tuning capabilities: This feature allows the system to continuously monitor and adjust fueling to maintain the correct air/fuel ratio, improving your vehicle’s performance.
  • Easy-to-use software: The user-friendly software makes it simple to adjust and fine-tune your engine’s performance.
  • Parts availability: Holley offers a wide range of parts and components, making it easy to customize and upgrade your system.
  • Broad spectrum use: From road racing to circle track, off-road, and drag racing, Holley EFI can be utilized in a variety of applications.

This is the same ECU used in ARCA, NASCAR trucks, NHRA Pro Stock, and more. So you can rely on the kits that the pros use. Whether you’re looking to improve cold start issues, hesitations, vapor lock, or flooding, the Holley EFI has got you covered. It’s modern technology at an affordable price.

Tips and Tricks

Idle Setting / IAC Position

Just like a carburetor the throttle plates need to be set to an optimal position; however, the ECU maintains idle speed with an idle air control valve (IAC) in the throttle body.

With the engine running, tap [Monitor] then [Idle]. Look at the “IAC Position” value. This value should be between 2 and 10 with the engine in neutral and up to operating temperature.

If the “IAC Position” value is showing zero, you must close the throttle plates. Slowly turn the throttle shaft adjustment screw on the throttle body out (counter-clockwise).

If the “IAC Position” value is greater than 10, you must open the throttle plates. Slowly turn the throttle shaft adjustment screw on the throttle body in (clockwise).

Note that when you open the throttle plates the “TPS” position may go above a value of 0%. If it does, you will need to shut the engine off and perform a TPS Autoset then restart the engine and continue adjusting the throttle plates.

When the adjustments are completed, make sure the “IAC Position” is between 2 and 10 and “TPS” reads a value of 0%.

TPS Autoset

A TPS Autoset programs the ECU with the full-travel voltage range from idle to wide open throttle for the Throttle Position Sensor (TPS). This must be done with the vehicle ignition power on. The TPS Autoset function is found under [Wizards] from the HOME SCREEN. Select [TPS Autoset] and follow the prompts:

Download the latest EFI Software from Holley