Throttle body fuel injection or tbi systems are configured for the most economical way to replace that old carburetor. Fuel pressure is similar to a singlepoint injection system. The bosch djetronic electronic fuel injection system is composed of 3 major. They include a throttle body, power module with wideband oxygen sensor, and handheld controller. Fuel injection equipment is much more precise in metering injected fuel spray into the intake ports over the operating range of engine speed, load, and temperature. Do not disassemble in a way other than shown in this manual. Fuel injection systems throttle body injection style. The mixture is then pulled into the engine by intake manifold vacuum. Design and optimization of a throttle body assembly 351 the performance of the throttle body is concerned.
Fuel injection system, go efi 8 power adder plus 1200hp, throttle body, satin black, injectors, ecm, kit 33 part number. User manual for efi fuel systems pg engineered control. Shop for affordable electronic fuel injection systems developed using oemlevel components, walkthrough fitech fuel injection. Digital fuel injection defi or dfi electronic fuel injection system controlled by digital microprocessors as opposed to earlier systems that were of analog design. This video explains how the throttle body injection works. The system uses tubes with poppet valves from a central injector to spray fuel at each intake port rather than the central throttle body citation needed. Aug 20, 20 this video is the working principle animation of electronic fuel injection system. Our oem throttle body injection tbi assemblies are complete and ready to install. Although the accelerator is commonly known as a gas pedal, it doesnt actually control the delivery of fuel to the engine. 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. Its the most universal type of electronic fuel injection system. Throttle body injection tbi introduces a low pressure fuel injection.
They supply the complete wiring necessary to operate the engine fuel system and spark control as originally designed. Each tbi assembly is coated with a long lasting aluminum oxide finish. Jegs has a large selection of high performance and replacement fuel injection parts to increase horsepower or just get you back on the road. These msd atomic efi fuel injection systems are the perfect choice for anyone planning on converting from carburetor to fuel injection. The throttle body is essentially the carburetor on a fuel injected engine that controls flow of fuel and air into the fuel injection manifold. 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. Its the most universal type of electronic fuel injection system, but its not ideal for high performance engines. View our gallery of our kits installed by customers. Where the throttle body injector differs from the carburetor is in the area of idle control. A throttle body assembly is an integral part of a fuelinjected engines air intake system. However, challenge is to design the air intake system that will provide minimum restriction to the flow. The injectors spray fuel into the top of the throttle body air horn the tbi fuel spray mixes with the air flowing through the air horn. Holley throttle body fuel injection systems oreilly.
Any component which does not meet autolines rigid standards is replaced with parts which equal or exceed o. 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. A throttle body is the intake system component in fuelinjected engines that the driver controls with the accelerator. Major dimensions of the throttle body are the throttle bore diameter d and bypass passage diameter dp, the overall length of the throttle body l is fixed based on the engine layout. The atomic efi installation kit for changing from a carburetor to fuel injection includes the throttle body unit, power module, oxygen sensor, handheld controller, fuel filter and correct injection rated fuelline hose. Prevent dirt and debris from entering the throttle bore, fuel tube and return tube, clean them using compressed air. Todays fuel injected cars depend on a fullyfunctional and clean throttle body to supply an airfuel mixture to each cylinder. Make sure to use proper gaskets to seal the throttle body to the intake manifold and ensure that there are no vacuum leaks. A throttle valve, operated by accelerator pedal, is located at the mouth of the.
Check all sources of potential vacuum leaks including components not related to the fuel injection system. Provides great starts, drivability, and fuel economy. Available for almost any make of engine with 12v ignition. Tbi fuel injection is a type of fuel injection system where the fuel is injected into the throttle body.
Symptoms of a bad or failing throttle body yourmechanic. This video is the working principle animation of electronic fuel injection system. On some models, the filter is part of the fuel pump itself, on others, it is located in the fuel line, and still others locate the filter at the carburetor or throttle body inlet. Cpfi used from 1992 to 1995 is a batchfire system, while csfi from 1996 is a sequential system. Aem, accel, bbk, edelbrock, fast, fitech, ford racing. There are some disadvantages of petrol injection system, and those are the following. 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. These instructions must be read and fully understood before beginning installation. It may cause incorrect throttle and idle valve synchronization. The throttle body features an integral ecu built on the.
Injection system consisting on a single fuel injector mounted in the throttle body. Positive fuel trim means the computer is adding extra fuel too lean. Apr 05, 2012 tbi fuel injection is a type of fuel injection system where the fuel is injected into the throttle body. This brief but highlyinformative video shows a typical install, on a 427fe.
Oct 12, 20 a throttle body is the intake system component in fuelinjected engines that the driver controls with the accelerator. This design delivers the fuel into the air flow stream in the plenum similar to a carburetor. Vacuum leaks are the leading cause of installation issues with your fuel injection system. Our framemount inline pump kit comes with the fuel pump and many items. Fuel injection systems throttle body injection style free. Aftermarket throttlebody fuelinjection systems hemmings. In fact, the go system is the only throttle body efi with a throttle body mounted ecu that has timing control without the need for an external cdi box. 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. All tbi assemblies are flow bench tested, calibrated and idle adjusted which makes for easy installation. How throttle body injection tbi works by howstuffinmycarworks. Throttle body injection chevy gmc tbi trucks gm tbi. Instead of calibrated passages, the injector system uses a motorized idle air control iac valve. What is covered here is generally applicable to most tbi systems, but we will be putting. There are instances where the vacuum leak is coming from the adapter plate used to attach the throttle body to the manifold.
Throttle body injection troubleshooting it still runs. Throttle body style efi systems feature fuel rails and injectors mounted directly to a throttle body. Beginning in 1985, some engines were available with a throttle body fuel injection system. Design and optimization of a throttle body assembly by cfd. The focal point of the video is the mechanical side of it, involving the fuel delivery. Similar to carburetor throttle body injection system with a throttle valve controlling the amount of air entering the intake manifold injector is placed slightly above the throttle body. The fuel control system figure 42 consists of the following components. Once the mixture enters the manifold it is sprayed into each cylinders. Cis continuous injection system used by european robert bosh vehicles may be mechanical or computer controlled constantly injects fuel at each intake port.
This throttle valve operates like the throttle valve on a carburetoras the throttle is opened, more air is allowed to enter the engine. The analog input signals to the microprocessor are converted from analog to digital before. A check valve in the pump discharge port maintains residual pressure in the delivery system when the engine is turned off and the pump is not operating. Well examine the fuel delivery system first and then the engine control. The throttle looks like a carburetor without the fuel bowl, the metering jets or the float. It gives the clear idea about how to work a fuel injection system. Throttle body injection chevy gmc tbi trucks gm tbi chevrolet. In order to clean the throttle body while its still installed on your engine, youll want to determine if the throttle body is manually operated with a throttle cable.
The throttle body is a tube containing a pivoting flat valve butterfly that is used to control the amount of air entering an engine. The system uses tubes with poppet valves from a central injector to spray fuel at each intake port rather than the central throttlebody citation needed. 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. Pdf sensors system,advanced fuel injection system,computer. Table of contents page contact list 3 engine management system overview 4 a ecm system components 7 b governed throttle body 8 c fuel components 10 d ecm 12 e engine sensor 14 f cold start capability 15. Design of throttle body figure 2 represents schematic of a throttle body with important dimensions. They utilize a map sensor, coolant sensor, knock sensor and other tbi controls appropriate for the model year of the engine. Therefore, it is very much essential for the engine designers to understand the air flow through the. 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. Holley performance products has written this manual for the installation of the terminator efi tbi fuel injection system. Msd ignitions atomic efi throttle body system was named best new product at the 2011 sema show in las vegas.
On older vehicles, the throttle body of a fuel injected engine is operated by a throttle cable that is either attached to the gas pedal or to an electronic throttle control. Injection tbi in tbi systems the throttle body assembly has two major functions. This instruction manual must be read and fully understood before beginning installation. Fuel sealed in the system cant evaporate or deteriorate during winter. 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 needed at the injectors. Injector spray the gasoline into the air in the intake manifold where gasoline mixes with the air and mixture passes through.
Cable from gas pedal to throttle body affects under. Maintaining residual fuel pressure at the injectors aids in quick engine starting. Order holley throttle body fuel injection systems for your vehicle and pick it up in storemake your purchase, find a store near you, and get directions. Caution to reduce the chance of personal injury andor property damage, the following instructions must be carefully observed. Throttle body injection system construction training manuals. Msd atomic efi throttle body systems 2910 free shipping. The throttle body in a car provides the control of air and fuel injection so that the system runs efficiently and does not backflow. Tps pin c to ground while manually opening the throttle plate. To help our customers shop hasslefree, we have categorized our products. Mar 07, 2020 fuel injection equipment is much more precise in metering injected fuel spray into the intake ports over the operating range of engine speed, load, and temperature. Mechanical throttle body electronic throttle body cam cam hardware design is on critical path to deliver drive characteristics.
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