Chevrolet/GMC Trucks & Suburbans Performer Multi-Point EFI System TBI-Equipped
Performer Multi-Point EFI Systems are designed for 1987-1992 (#3502) and 1993-1995 (#3501) 5.7L Chevy/GMCs originally equipped with Throttle Body Injection. These complete systems utilize the stock computer and throttle body unit for a simple and effective conversion to multi-point fuel injection. Fuel is injected directly into each port in the head for ideal fuel distribution and efficiency.
In 1987, Chevrolet introduced their Throttle Body Injection (TBI) systems. Produced from 1987 to 1995 on all pick-up trucks and Suburbans, this TBI system was essentially an intermediate step between a carburetor and true port (multi-point) fuel injection. In these TBI systems, two injectors are positioned above the throttle blades of a two-barrel throttle body and fuel is injected into the manifold, much like a carburetted system. This arrangement suffers from distribution problems because the fuel spray from the injectors does not stay in suspension with the incoming air, resulting in uneven distribution. Our Performer Multi-Point Systems include an intake manifold designed to deliver an equal air charge to each cylinder. Each injector delivers exactly the same amount of fuel to each cylinder for an extremely even air/fuel ratio from cylinder-to-cylinder. This permits us to tune the system for ideal fuel and spark delivery for more horsepower, torque and improved mileage.
Performer Multi-Point Systems include all parts needed to make the conversion. The stock TBI unit is retained as an air valve and the factory computer (re-programmed) is also retained to control the injectors in a batch-fire mode. In the Edelbrock systems, all of the factory sensors are retained and fully functional. The compact size was achieved by using extruded aluminum fuel rails with new Magnetti Marelli® pico injectors. These are half the size of conventional style injectors.
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