Its the most universal type of electronic fuel injection system, but its not ideal for high performance engines. Aem, accel, bbk, edelbrock, fast, fitech, ford racing. Some early efi systems use throttle body injection tbi which uses a throttle body with electronic fuel injectors built inside. As of 2016 holley efi is also used to control every nhra pro stock car that goes down the strip. How throttle body injection tbi works by howstuffinmycarworks.
Most of the tbi systems use bottom fed fuel injectors. Searching for info concerning throttle body fuel injection systems diagram. Throttle body injection system construction training manuals. This video explains how the throttle body injection works. Turn the ignition key switch on, then move ignition key to the start position. The twists and turns of the intake runners can also cause the air and fuel mixture. The throttle body is a valve located along the piping between your air intake, and your intake manifold. The throttle body is a tube containing a pivoting flat valve butterfly that is used to control the amount of air entering an engine. All safety precautions must be observed when working with fuel. Throttle body style efi systems feature fuel rails and injectors mounted directly to a throttle body. Our oem throttle body injection tbi assemblies are complete and ready to install. The fuel pump and efi inline filter require male 14npt fittings. Fuel is delivered to the throttle body injection system by an electric fuel pump located in the fuel tank. This is a universal, throttle body style, electronic fuel injection system, intended for most v8 engines originally equipped with carburetors and intake manifolds with squarebore 4150 style flanges does not work on point type ignition systems.
Beginning in 1985, some engines were available with a throttle body fuel injection system. Fuel injection from a great selection at automotive store. Figure 1 sum240505 kit contents 1 4 injector throttle body with matte black finish 2inleuoutlet port plugs installed on. Acdelco gm original equipment fuel injection throttle body assembly is a gmrecommended replacement component for one or more of the following vehicle systems.
Its here where fresh air is slurped down into your engine for combustion but only as much air as the throttle body. These instructions must be read and fully understood before beginning installation. The throttle looks like a carburetor without the fuel bowl, the metering jets or the float. Psi fuel injection gasolinelpgdual fuel select the desired fuel switch position for starting the engine gasolinelpg.
With throttle body injection tbi, one or two injectors mounted in the throttle. All pressureside fuel lines to the throttle body are required to be fuel injection rated working pressure is 45 psi. If this manual is not fully understood, installation should not be attempted. The throttle body fuel injection system, or tbi as referred to by gm or cfi by ford, works using a single or pair of injectors. The feed line to the fuel pump must be 38inch hose or 06an minimum.
For the last time, throttlebody fuel injection isnt a carburetor. Holleys hp ecu is standard equipment on the 202016 chevrolet copo camaro and holleys efi throttle body powers every nascar sprint cup series team. In simple terms, we have either throttle body injection tbi, where the injectors are mounted in the throttle body assembly, providing a central point air fuel delivery atop the intake manifold, or multipoint fuel injection mpfi, where one fuel injector is dedicated per cylinder, with each. All tbi assemblies are flow bench tested, calibrated and idle adjusted which makes for easy installation. The throttle looks like a carburetor without the fuel. A throttle body that incorporates one or more fuel injectors provides both fuel and air and can be referred to as a wet throttle body. Vacuum leaks are the leading cause of installation issues with your fuel injection system. How to rebuild a tbi throttle body injection system duration. Ford v8 kits ford 302 ford 351c ford 351w ford 427fe ford coyote chevy v8 kits.
Operation and maintenance manual southeastern equipment. True dualtable staged injection not just onoff, each bank of injectors has its own dedicated fuel table for smooth afr transitions makes it easier to tune and able to get more passes from your race engine. Fitech fuel injection reserves the right to refuse or cancel any such orders whether or not the order has been confirmed and your credit card charged. Follow the service manual procedure to relieve fuel system pressure. There are instances where the vacuum leak is coming from the adapter plate used to attach the throttle body. Or you are a student, or perhaps even you who simply would like to know about throttle body fuel injection systems diagram. This pump supplies fuel pressure in sufficient volume to meet the engines fuel requirement through all load conditions. Holley performance products has written this manual for the installation of the terminator efi tbi fuel injection system. Disconnect the battery ground wire before starting the installation. The injectors spray fuel into the top of the throttle body air horn the tbi fuel spray mixes. This generally involves disconnecting power from the fuel pump and starting the engine to use the remainder of the. After the engine starts release the key to the on position.
Fully programmable electronic fuel injection by dfi is here. Edelbrock estreet electronic fuel injection system. Tbi fuel injection is a type of fuel injection system where the fuel is injected into the throttle body. Apply penetrating oil to the screws that hold the top on the fuel injector pod. The main difference between carburetor and fuel injection system carburetorzfuel is atomized by processes relying on the air speed greater than fuel speed at the fuel nozzle, zthe amount of fuel drawn into the engine depends upon the air velocity in the venturi fuel injection systemzthe fuel speed at the point of delivery is greater than the air speed to atomize the fuel. The focal point of the video is the mechanical side of it, involving the fuel delivery.
Buy autoline products fi933 throttle body injection. The ezefi system is made up of several main components. Other functions of the throttle body are idle bypass air. Choose from larger fuel injectors, fuel rails, fuel injection controllers, mass air meters, bigger throttle bodies, complete fuel injection kits and more from leading fuel injection leaders. The table shows guidelines to be followed when selecting bore size for assumed bhpcylinder using an assumed rev range up to 9,000rpm. In an electronically fuel injected car, a throttle position sensor and air flow sensor communicate with the computer, which supplies the corresponding amount of fuel. Fast is the leading developer of electronic fuel injection systems, efi components, intake manifolds, tuning tools for high performance and street applications throttle bodies javascript seems to be disabled in your browser. A throttle body assembly is an integral part of a fuel injected engines air intake system. Each tbi assembly is coated with a long lasting aluminum oxide finish. Online shopping for throttle body injection kits fuel injection from a great selection at automotive store. Thank you for selecting the edelbrock estreet electronic fuel injection efi system.
Speedometer calibration and gear indicators calibrating your speedometer 6th gear indicator settings 12. This design delivers the fuel into the air flow stream in the plenum similar to a carburetor. You might be a professional who wishes to search for recommendations or fix existing problems. Caution to reduce the chance of personal injury andor property damage, the following instructions must be carefully observed. Racing equipment installation and adjustment instructions.
Throttle body fuel injection initial calibration of the tbi disclaimer the author of this presentation assumes no responsibility for information provided causing the owner to modify or alter their motorhome which shall result in problems or mishaps. Throttle body injection chevy gmc tbi trucks gm tbi. If your credit card has already been charged for the purchase and your order is cancelled, fitech fuel injection shall issue a credit to your credit card account in the amount of the incorrect price. This original equipment assembly will provide the same performance, durability, and service life you expect from general motors. Motorsport fuel injection throttle bodies, throttle body kits and induction systems delivered straight to your door. Check all sources of potential vacuum leaks including components not related to the fuel injection system. Throttle bodies free delivery possible on eligible purchases. Pdf sensors system,advanced fuel injection system,computer. The quick and easy approach to electronic fuel injection.
The overall size and dimensions are close to a carburetor so that. What is a throttle body and how does it control your engine. All throttle body injected vehicles are controlled by a computer which regulates idle speeds and supplies the correct amount of fuel during all engine operating conditions. To help our customers shop hasslefree, we have categorized our products. Fuel injection systems throttle body injection style. Its function is to regulate the amount of air that flows into the engine accounting for factors such as throttle gas pedal position, idle speed, cold start warmup, and more. Runs good then starts to run bad 100 miles oxygen o2 sensor operation testing 11. Jegs has a large selection of high performance and replacement fuel injection parts to increase horsepower or just get you back on the road. Throttle body maintenance how to properly clean tps throttle position sensor issues 10.
This manual contains the information necessary for the installation of the hardware contained in this kit, which includes the ecu, wiring, throttle body, and sensors. Learn what tbi fuel injection is, its benefits and drawbacks, and tips for increasing the fuel efficiency of throttle body injection. Shop for affordable electronic fuel injection systems developed using oemlevel components, walkthrough fitech fuel injection. Renew kit for 1 bbl replacement tbis and 1 bbl projection systems. Table driven per cylinder fuel trims table for each cylinderrpm and cylindermap. Fuel tank the fuel tank contains a fuel gauge sending unit, a filler tube and a fuel pump.
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