Regan Brown
Converting a carbureted engine to fuel injection is a complex process that involves replacing the carburetor with a fuel injection system, which includes the fuel injectors and several other components. This conversion can bring several advantages, such as improved fuel efficiency, better performance, easier starting, and reduced emissions. However, it is important to consider compatibility issues and the loss of simplicity associated with fuel injection systems. The process can be made easier with the use of fuel injection conversion kits, which provide all the necessary parts for the upgrade. These kits are available from companies like Holley, MSD, and Summit Racing. The conversion process involves removing the carburetor, installing the injectors, throttle body, and sensors, and making sure there are no leaks in the exhaust system.
Characteristics and Values Table for Converting a Car to Fuel Injection
| Characteristics | Values |
|---|---|
| Carburetor Removal | Remove fuel lines, hoses, and nuts holding the carburetor in place. |
| Injector Installation | Install injectors into the intake manifold, which may require welding. |
| Throttle Body Installation | Bolt on and connect the throttle body to the throttle linkage and accelerator pedal. |
| Sensor Installation | Install coolant temperature sensor, throttle position sensor, manifold absolute pressure sensor, and others as needed. |
| Fuel Lines and Rails | Install new fuel lines and rails to connect fuel pump, injectors, and pressure regulator. |
| Fuel Pump Type | Choose between return-style and return-less fuel pump types. |
| Idle Speed and Timing Control | Set target idle speed and choose whether to enable timing control. |
| Tuning | Adjust throttle blades, fuel map, and other parameters for optimal performance and fuel efficiency. |
| Compatibility | Consider vehicle-specific requirements and modifications needed for the conversion. |
| Kits | Purchase a conversion kit suitable for your vehicle's make, model, and year. |
| Cost | Budget for the cost of the kit, which can vary from under $2,000 to over $4,000. |
| Benefits | Improved fuel efficiency, performance, starting, and reduced emissions. |
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$1749.95
What You'll Learn
Choosing the right fuel injectors
Firstly, bigger is not always better. While it may seem that larger fuel injectors will deliver more power, this is not necessarily true. If your engine is not set up to handle the extra fuel, the excess fuel will flood the engine, causing it to run too rich or not at all. This can lead to fouled spark plugs and engine damage. Therefore, it is crucial to ensure that your engine can accommodate larger fuel injectors if you choose to go down that route.
To increase your fuel capacity and accommodate larger fuel injectors, you can consider several options. One option is to increase the airflow by installing a turbocharger or supercharger or fitting a bigger throttle body. Another option is to install a bigger exhaust. Additionally, you may need to remap the computer to adjust the fuel delivery and ensure the engine receives the correct air-fuel ratio.
When selecting fuel injectors, it is important to consider the horsepower expectations of your modifications. A reputable car tuner can help you determine the right size of fuel injector to achieve your desired horsepower. Other critical factors to consider are whether the car is turbocharged or supercharged and whether you are using E85 or standard pump petrol.
It is also important to choose a quality injector manufacturer that can provide accurate and detailed injector data. This data will help you understand the injector's flow rate and ensure it can keep up with the engine's demands. Additionally, consider the duty cycle, which is the percentage of time the injector is open during one injection period. A duty cycle above 85% is considered too high and may lead to the engine running lean, causing potential issues.
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Removing the carburetor
Removing the carburettor is the first step in converting a carburetted engine to a fuel injection system. This conversion involves replacing the carburettor with a fuel injection system, which includes not just the fuel injectors but also several other components and modifications to ensure proper functionality.
To remove the carburettor, you must first take off the fuel lines and hoses that are connected to it. The carburettor is mounted to the manifold by nuts, which must be removed with a wrench. If the carburettor is in good condition, it can be sold as a used part; otherwise, it can be discarded.
Once the carburettor has been removed, the next step is to install the injectors into the intake manifold. This process may require welding and should be done by a professional mechanic or at a machine shop.
It is important to note that not all engines or vehicles are easily converted to fuel injection. Some may require extensive modifications to accommodate the new system, and suitable kits may not be readily available. Additionally, the conversion process is complex and requires mechanical and electrical skills.
There are several advantages to converting to a fuel injection system, including improved fuel efficiency, increased power, better throttle response, and reduced emissions. Fuel injection systems provide more precise fuel delivery, resulting in more complete combustion and cleaner exhaust. They also offer automatic altitude adjustment and consistent performance across various temperature and atmospheric pressure conditions.
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Installing the throttle body
Upgrading the throttle body of an older vehicle is a great way to improve drivability and fuel economy. Throttle body injection (TBI) is a type of fuel injection system that serves as a segue between carburetion and multiport fuel injection (MPI).
When installing a throttle body, the first step is to remove the old induction system and carburetor. This can be done by simply replacing the carburetor with a throttle body injection system, such as Holley's Pro-Jection electronic throttle-body fuel-injection system, which is a cost-effective and easy-to-install option. The TBI system will have one or two fuel injectors mounted in the throttle body, which deliver fuel into the air above the throttle plates.
The next step is to run the fuel injection hose to the prefilter, pump, and post-filter, and then onwards to the throttle body. It is important to ensure that the inline pump and fuel line are securely clamped to the frame using rubber-coated clamps. The vehicle's fuel pump then moves the fuel from the gas tank to the throttle body assembly.
At this point, you can activate the TBI injectors, which are controlled by the powertrain control module (PCM). The injectors will spray fuel into the throttle body bore, above the throttle plates. The fuel pressure regulator will control the fuel pressure by routing excess fuel back to the fuel tank.
Finally, it is important to consider the electrical requirements of the new fuel injection system. Additional components may require a proper source of power, so it may be necessary to add extra fuse panel outlets.
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Installing the sensors
Firstly, several sensors are required to be installed, including an oxygen sensor, manifold air pressure sensor, air temperature sensor, coolant sensor, and throttle position sensor. These sensors are generally easy to install, as they can be screwed into the engine. Ensure that your kit contains all the necessary sensors; if not, you can purchase additional sensor packages.
Next, the distributor needs to be adjusted. Since the new EFI system controls the timing and advance of the ignition, these functions need to be locked out of the distributor. This includes locking out the vacuum and mechanical advance. Most distributors will work fine with a bank-to-bank EFI system, but if you are using sequential fuel injection, a dual sync distributor may be required.
Now, let's focus on the electronics. The easiest approach is to install an aftermarket system, as reprogramming a factory control unit can be extremely challenging. Ensure that the control/power module is mounted securely, away from major sources of heat and moisture. Use the supplied sleeves, rubber mounting pads, and screws for a stable installation, placing the module where connectors are easily accessible.
Finally, the throttle body, which regulates airflow into the valves, needs to be installed. Bolt the throttle body in place and connect it to the throttle linkage, which is linked to the accelerator pedal. Most throttle bodies come with an idle air controller (IAC) already installed. If not, ensure you install an IAC, placing it in a small passage that controls the airflow past the throttle plates.
Remember, converting a carbureted engine to fuel injection can be complex, and it is recommended to seek a trained mechanic's assistance.
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Tuning the chip
The first step in tuning the chip is to ensure that the engine control unit (ECU) is receiving full battery voltage from the alternator. This will help the ECU stay consistent. The injector battery voltage offset can also be inconsistent, which makes it difficult to supply fuel to the engine. Therefore, it is important to use a little more ignition advance at idle than normal to help the engine produce more torque and run better.
The next step is to set the calibration. When the engine is at full power, the calibration can be set for good performance and reliability. When the vehicle is cruising, the "economy" part of the tune can take over, providing great gas mileage.
It is also important to have complete injector data when tuning the chip. Variables within fuel injector construction can lead to poor engine operation. To avoid this, injector companies like Injector Dynamics and Fuel Injector Connection provide plug-and-play data to go along with their injectors. Additionally, almost all ECUs will allow you to enter a fuel injector linear injector flow rate and values for offset as a function of voltage. However, it is important to note that different OEMs may define the "offset" differently.
Finally, there are more advanced features that can be tuned, such as boost control, launch control schemes, and the use of EGT sensors. Using multiple wideband O2 sensors can allow you to tune each cylinder individually and synchronize them to ensure perfect fueling.
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Frequently asked questions
The process involves replacing the carburetor with a fuel injection system, which includes the fuel injectors and several other components.
Fuel injection can improve fuel efficiency, increase power, and reduce emissions. It also makes starting the car easier, especially in cold conditions.
The main disadvantage is the loss of simplicity as fuel injection systems are more complex and computer-controlled. There may also be compatibility issues, with some vehicles requiring extensive modifications to fit the new system.
There are two basic types of fuel injection: throttle body injection (TBI) and multi-port fuel injection (MPFI). Throttle body injection systems are easier to install, while multi-port fuel injection requires the installation of a new intake manifold and fuel rails.
The cost of a fuel injection conversion kit can vary depending on the type of kit and the car model. Basic kits can start from under $2000, while individual components can also be sourced separately. The cost of a replacement fuel injection pressure regulator can range from $40 to $200, and professional installation typically costs around $50 to $100.
