Mercedes Mullins
Fuel injectors are an essential component of a car's engine, responsible for how smoothly the engine operates and its maximum power output. Selecting the right size of fuel injectors is critical for increased power and reliability. The size of the fuel injectors depends on several factors, including the engine's horsepower, the type of fuel used, and the engine's setup. While bigger fuel injectors can provide more power, they can also cause issues if the engine is not equipped to handle the extra fuel, leading to potential damage. On the other hand, using smaller injectors than required can result in the engine running too lean, causing sluggish performance or even piston burnout. It is crucial to have accurate injector data and consider the specific requirements of your engine when choosing the appropriate fuel injector size to ensure optimal fuel economy and engine performance.
| Characteristics | Values |
|---|---|
| Fuel Type | Gasoline, Ethanol, E85, Race Gasses, Fuel Additives |
| Fuel Injector Flow Rate | 43 psi/3 bar (industry standard) |
| Fuel Injector Sizes | 34mm, 48mm, 60mm |
| Fuel Injector Plug Types | Ev1/Jetronic, Ev6/USCAR, Denso/Sumitomo |
| Fuel Injector Driver | Peak-and-hold, Saturated |
| Fuel Injector Data | Accurate data improves fuel economy |
| Fuel Injector Size vs Horsepower | Larger injectors for more horsepower, up to a point |
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What You'll Learn
Fuel injector size vs horsepower
Fuel injector size and horsepower are closely related, and getting the right match is critical for performance and tuning control. The wrong choice of fuel injectors can cause the engine to run roughly or even ruin it altogether.
The first step in choosing the right fuel injector size is to understand how much horsepower you expect to achieve with your modifications. The next step is to calculate the injector size for that horsepower goal. There are several online fuel injector vs horsepower calculators that can help with this. The calculator will determine the cc/min size injector you need to fuel your desired horsepower level.
The fuel injector size vs horsepower will change based on the fuel being used. For example, E85 fuel requires 30-40% higher fuel flow capacity compared to gasoline to achieve the same AFR level. This will also impact fuel efficiency vs horsepower, so you will use more fuel and need to size your fuel system accordingly.
It is important to note that bigger injectors do not always equal more power. Unless your engine is set up to deal with the extra fuel, it can be flooded and either won't run at all or will run too rich, leading to fouled spark plugs and engine damage. To accommodate larger fuel injectors, you can increase airflow by installing a turbocharger or supercharger, fitting a bigger throttle body or exhaust, or remapping the computer.
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Fuel type
Fuel injectors are categorised into four main types: single-point fuel injection, multi-point fuel injection, sequential fuel injection, and direct fuel injection.
Single-point injection systems are the oldest and simplest form, where a single fuel injector nozzle is placed in the throttle body (the throat of the engine's air intake manifold). This type of injection system is less precise and may not deliver the desired air-fuel ratio, which can impact fuel economy.
Multi-point fuel injection (MPFI), on the other hand, dedicates a separate injector nozzle to each cylinder, placed outside its intake port. This ensures that the fuel is almost entirely drawn into the cylinder, improving metering and achieving the desired air-fuel ratio, leading to better fuel economy.
Sequential fuel injection, a type of multi-port injection, triggers each injector nozzle independently, spraying fuel immediately before or as the intake valve opens. This improves efficiency and emissions, contributing to better fuel economy.
Direct fuel injection bypasses the intake valve or manifold by placing the injector inside the cylinder, directly injecting the fuel. This system, more common in diesel engines but also used in petrol engines (known as GDI or DIG), maximises fuel economy and engine power.
Additionally, fuel injectors can be categorised into high and low impedance types. High impedance injectors, commonly used in street applications, have a resistance value of around 12 ohms, resulting in a continuous current draw of about 1 amp. This design reduces heat buildup, allowing extended operation with high reliability. Low impedance injectors, while less common, are driven by a peak-and-hold injector driver and are typically found in aftermarket ECUs.
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Injector harness plug style
Fuel injector connector kits come with all the parts needed to replace, rebuild, or repair broken fuel injector connectors using your existing wiring harness. You can dismantle your existing broken fuel injector connector/plug using a terminal release tool or a very small and thin screwdriver or dental probe. Reuse your existing wires; first, cut off the old metal terminals, and then crimp the new metal terminals on the existing harness wire. Snap the new metal terminals/pins into a brand new nylon fuel injector connector/plug body. No need for splicing, and no need to scrounge around junk yards looking for fuel injector connector pigtails.
There are several types of fuel injector connectors/plugs:
- Female USCAR/EV6 Style Type C Yellow Fuel Injector Connector – this is a sealed connector/plug that comes preassembled and will need to be disassembled. This connector also has a red sliding latch/lock to lock it in place on the fuel injector.
- USCAR Style (EV6) Male Fuel Injector Connector Kit – also known as the Bosch EV6 Style Male Fuel Injector Connector/Plug. This GM-style fuel injector connector was used on many (but not all) GM vehicles beginning around the year 2000. The connector kit includes metal terminals and sealing gaskets and a blue latch lock. An available option includes a 6” pigtail using 20-gauge heat/oil-resistant wire.
- GM “Mini” Delphi/Multec 2 Style Female Fuel Injector Connector Kit – this GM-style fuel injector connector was used on many (but not all) GM vehicles beginning around the year 2000.
- GM “Mini” Delphi/Multec 2 Style Male Fuel Injector Connector Kit.
- Jetronic/Minitimer, and USCAR are Fuel Injector Connector Types.
- Jetronic/Minitimer (EV1) Style Female to USCAR (EV6) Male Adapter – also known as the Bosch Style EV1 Female to EV6 Male Adapter. This adapter comes completely assembled and is ‘plug and play’ ready to use.
- Jetronic/Minitimer (EV1) Style Female Fuel Injector Connector Kit – also known as the Bosch EV1 Style Female Fuel Injector Connector/Plug.
Many OEM brands of auto/truck/marine/motorcycle/ATV applications use their own unique injector connector design. Some examples include GM Delphi, Honda, Nippon Denso, Sumitomo, Nissan, and Toyota. Your F. I. Connector will most likely be Jetronic/Minitimer, USCAR, or one of the Manufacturer-specific plugs.
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Fuel injector flow rate
An engine requires specific fuel injector flow rates at different operational phases, and these flow rates are programmed into the electronic control unit (ECU) by the manufacturer. The ECU then determines the number of pulses sent to each injector to achieve the desired fuel delivery. If the flow rate is not uniform across all injectors, the engine may experience issues such as reduced maximum power output and fuel economy.
When selecting fuel injectors, it is crucial to ensure they are appropriately sized for the engine's power output. Injectors that are too large will result in sluggish acceleration, while those that are too small will starve the engine of fuel. The right fuel injectors will help achieve the desired performance level and maximize fuel economy.
To calculate the ideal fuel injector flow rate, one must consider the target horsepower, Brake-Specific Fuel Consumption (BSFC), and safe duty cycle. The formula for calculating the flow rate is: injector flow rate = horsepower × BSFC / # cylinders × safe duty cycle.
Additionally, the type of fuel used also impacts the required fuel injector flow rate. For example, E85 fuel requires a 30-40% higher fuel flow capacity compared to gasoline to achieve the same AFR level.
In summary, the fuel injector flow rate plays a vital role in achieving optimal engine performance and fuel economy. By selecting the right injector size and flow rate, you can ensure that your engine receives the correct amount of fuel, maximizing its efficiency and preventing potential damage.
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Injector data
Fuel type is another critical factor in injector data. Different fuels, such as gasoline, ethanol, and E85, have varying fuel flow requirements. For instance, E85 fuel requires approximately 30-40% higher fuel flow capacity compared to gasoline to achieve the same air-fuel ratio (AFR) level. This increase in fuel flow can also affect fuel efficiency, as a higher volume of fuel is required to produce the same amount of power.
Additionally, injector data may include information on the injector's plug type and compatibility with specific vehicles. Over the years, there have been various plug types, with some of the most prominent styles being Ev1/Jetronic, Ev6/USCAR, and Denso/Sumitomo. Ev1/Jetronic is commonly found on older models, especially low impedance injectors, while Ev6/USCAR dominates newer injector models and offers water resistance. Denso/Sumitomo is prevalent in imported vehicles and provides similar benefits to USCAR.
It is important to note that bigger injectors do not always equate to better performance. While larger injectors can provide more power, they can also lead to flooding the engine if it is not set up to handle the extra fuel. This can result in engine damage and fouled spark plugs. Therefore, it is crucial to consider the engine specifications and seek expert advice when selecting the appropriate injector size for your vehicle.
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Frequently asked questions
The size of the injector depends on the horsepower of the engine. A larger injector will lower the pulse width at the same engine rpm, load, and AFR. For a 900 horsepower engine, a 95 to 100 lb/hr injector is a good starting point. A 1000cc injector is needed to make 1000 crank horsepower on 93 octane gasoline. A 4-cylinder turbo car that makes 800-900 whp will need a large injector in the range of 1600-2000cc/min.
Fuel injectors can be categorised into two main types: high and low impedance. High impedance injectors are the most common selection for street applications and have a resistance value of around 12 ohms. Low impedance injectors require a peak-and-hold injector driver and are typically only used in aftermarket ECUs.
Although there is no industry standard, modern fuel injectors fall into three main sizes: 34mm, 48mm, or 60mm.
You should consider the fuel type, such as gasoline, ethanol, or race gases, as well as the injector harness plug style, such as USCAR (ev6) or Jetronic (ev1). The fuel injector flow rate is also important, with the industry standard being 43 psi/3 bar.
Larger fuel injectors can provide increased power and reliability. However, bigger is not always better. If the engine is not set up to handle the extra fuel, it can lead to flooding and damage to the engine.
