Tri-Power EFI Systems

Form Meets Function: The Butler Tri-Power Advantage

The core of the Butler Tri-Power EFI system is a sophisticated conversion that is aesthetically identical to the classic six-pack but functions like a modern fuel-injected engine.

• Classic Aesthetics: The system features three throttle bodies (often based on FiTech technology) finished in a classic carburetor gold finish and designed to bolt onto a factory or reproduction Tri-Power intake manifold. With the air cleaners installed, the engine bay is visually indistinguishable from an original setup.

   

• Modern Reliability: The primary upgrade is the shift from a venturi-based carburetor system to a high-pressure, injector-based EFI system. This eliminates common carburetor issues like vapor lock, fuel smell, hard starting, and jet changes for altitude or temperature shifts.

   

• Self-Learning Power: The included ECU (Electronic Control Unit) uses a wide-band oxygen sensor to monitor exhaust gas and automatically tune the fuel map while you drive. This self-learning capability allows the system to be fine-tuned to your specific engine (from a stock 389 to a $505\text{ci}$ stroker) with minimal effort from the installer.

   

• High Horsepower Support: These systems are typically rated to support up to $600\text{hp}$, making them suitable for the vast majority of Butler-built street and street/strip performance engines.

The Butler Built Difference: Ready for Installation

Converting to EFI involves more than just swapping the throttle bodies; it requires matching a high-pressure fuel system to the new induction setup. Butler Performance eliminates the typical installation headaches by offering a truly comprehensive package:

Crucially, Butler often ships the "Butler Built EFI Tri-Power System" as a dyno-proven unit, meaning it has been run on a test engine and pre-tuned, requiring only minor adjustments for the customer's specific application.

The Fuel System Requirement

While the Tri-Power assembly is complete, all EFI systems require a high-pressure fuel delivery system ($58\text{psi}$ is typical). Butler Performance can supply the necessary components to complete the conversion, including:

• EFI-Ready Fuel Tanks with an internal high-pressure pump and baffling.

• In-line High-Pressure Pumps or Power Surge Tanks.

• All necessary high-pressure lines, filters, and bypass regulators.

   

By choosing a Butler-sourced Tri-Power EFI system, enthusiasts get guaranteed performance, modern reliability, and the undeniable cool factor of the most iconic induction setup in Pontiac history.