Sylvie Willis
Fuel injectors are an important component of a car's engine, and selecting the right size is critical for performance and tuning control. Modern fuel injectors typically come in three sizes: 34mm, 48mm, and 60mm. Various factors determine the appropriate fuel injector size, including the fuel type, injector harness plug style, engine specifications, and desired horsepower. It is also essential to consider the fuel pump's capacity to deliver fuel at the required volume and pressure. Additionally, injector data, such as dead time and accurate response characteristics, play a crucial role in ensuring proper control by the on-board computer. While there are standard sizes and calculations, custom mounts or adaptors may be required for specific injector types.
| Characteristics | Values |
|---|---|
| Fuel injector sizing | Critical for performance and tuning control |
| Fuel injector types | High and low impedance |
| High impedance injectors | Resistance value of around 12 ohms |
| Low impedance injectors | Require a peak-and-hold injector driver |
| Fuel injector flow rate sizing | Industry standard is 43 psi/3 bar |
| Fuel injector size | 34mm, 48mm, or 60mm |
| Fuel injector plug types | Ev1/Jetronic, Ev6/USCAR, Denso/Sumitomo, Multec/Mini-Delphi |
| Fuel type | Gasoline, ethanol, race gasses, fuel additives |
| Fuel injector data | Accurate data improves idle and light throttle driving situations |
| Fuel injector size vs horsepower | Larger injector size may be needed for higher horsepower |
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What You'll Learn
- Fuel injector sizing is critical for performance and tuning control
- Modern injectors are mostly 34mm, 48mm or 60mm
- Injector harness plug style is important, e.g. USCAR (EV6)
- High impedance injectors have a resistance value of around 12 ohms
- Accurate injector data is key for a tuner to control the fuel injector
Fuel injector sizing is critical for performance and tuning control
When selecting a fuel injector, it is essential to consider the fuel type, such as gasoline, ethanol, or race gases, as well as any fuel additives that may be used. The injector harness plug style is also a factor, with options like USCAR (ev6) and Jetronic (ev1) being common choices.
The flow rate of the fuel injector is another critical aspect. While the industry standard is 43 psi/3 bar, some manufacturers may opt for different rates. A larger injector will deliver more fuel, but it's important to note that this can impact idle and drivability, especially with smaller engines. For example, a 4-cylinder turbo car with 800-900 whp will require a large injector of 1600-2000cc/min, but this may result in challenges with idle quality compared to a smaller injector.
Accurate injector data is crucial for proper control of the fuel injector by the on-board computer. Without this data, the computer may not be able to compensate for the lag characteristic of the injector, leading to issues with fueling, especially at low pulse widths during idle and light throttle operation.
To aid in selecting the proper fuel injector size, tools like the FuelTech Fuel Injector Calculator are available. This calculator allows users to input parameters such as the number of fuel injectors, estimated horsepower, and the type of induction to receive recommendations for fuel injector sizing.
In summary, fuel injector sizing plays a significant role in achieving optimal performance and tuning control. By considering factors such as fuel type, plug style, flow rate, and injector data, individuals can make informed decisions about fuel injector sizes to meet their specific requirements.
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Modern injectors are mostly 34mm, 48mm or 60mm
Modern fuel injectors mostly come in three sizes: 34mm, 48mm, and 60mm. Although there is no industry standard for measurement, the inside O-ring to inside O-ring method is commonly used. The 34mm injectors are the most cutting-edge, with the Bosch ev14 compact being the standard for motorsport injectors. The 48mm size, also known as the ev14 medium or mid-length, is commonly found in GM race-based cars like the LS2. The 60mm size is highly popular due to its ease of use when raising a fuel rail.
Determining the size of your fuel injectors is crucial for achieving optimal performance and tuning control. Fuel injector sizing impacts the amount of fuel delivered to the engine, and selecting the right size ensures the engine receives the required fuel amount for its specific application.
Various tools and considerations can assist in determining fuel injector size. FuelTech, for example, offers a Fuel Injector Calculator that recommends injector sizing based on factors such as the number of injectors, estimated horsepower, and type of induction (naturally aspirated or turbocharged). This calculator simplifies the process of selecting the appropriate injector size for gasoline, alcohol, or ethanol-powered engines.
It is also important to consider the impedance of the fuel injectors, which can be categorized as high or low impedance. High impedance injectors, commonly used in street applications, have a resistance value of around 12 ohms and provide excellent reliability due to reduced heat buildup. Low impedance injectors, on the other hand, require a peak-and-hold injector driver and are typically found in aftermarket ECUs.
Additionally, factors such as fuel type, injector harness plug style, and flow rate also play a role in injector size selection. Selecting the correct injector size ensures that the engine receives the necessary fuel for its intended use, whether it be for a normally aspirated engine or a high-performance turbocharged setup.
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Injector harness plug style is important, e.g. USCAR (EV6)
Injector harness plug style is an important consideration when choosing a fuel injector. There are several prominent styles that cover most applications, and while simple adapters are widely available, it is still important to understand the different types.
The injector harness plug style you choose will depend on the make and model of your vehicle, as well as the type of fuel injector you are using. For example, USCAR (EV6) injector connectors are commonly used on newer model vehicles, especially those manufactured by Ford, GM, and Chrysler since 2006. These connectors are also known as Bosch Motorsport style connectors and are used on Bosch EV6 and EV14 fuel injectors. USCAR refers to the United States Council for Automotive Research LLC, an industry standards organization that helps to standardize components used in Ford, GM, and Chrysler vehicles.
The EV6 plug style is considered more modern and is very common, dominating new injector models. It has an O-ring on the male end of the plug, which makes it water-resistant and aids in corrosion resistance. This style of plug is also available in an EV14 'pencil-thin' variation.
Other injector harness plug styles include Jetronic (EV1), found on older models and older low impedance injectors; Denso (Sumitomo), which is common on imported vehicles; and Multec (Mini-Delphi).
It is worth noting that the Bosch manufacturing generation names like EV1 and EV6 are technically incorrect but have become the accepted naming convention.
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High impedance injectors have a resistance value of around 12 ohms
Fuel injectors come in various sizes and types, and it can be challenging to determine the size and flow rate of your fuel injector. The size of a fuel injector is critical for performance and tuning control. Modern injectors fall into three main sizes: 34mm, 48mm, or 60mm.
Now, when it comes to impedance, this refers to the measure of opposition to the flow of an electrical current. In other words, it indicates how much a material resists the flow of electricity. Low-impedance fuel injectors are typically used in high-performance applications where a large amount of fuel is needed, while high-impedance fuel injectors are suitable for more moderate applications with lower fuel requirements.
High impedance injectors, which are commonly used in street applications, have a resistance value ranging from 8 to 16 ohms. Specifically, high impedance injectors have a resistance of around 12 ohms. This type of injector is also known as a saturated injector and is widely used due to its cost-effectiveness.
In contrast, low impedance injectors have a coil resistance of 4 ohms or lower. They are often associated with high-performance or large-sized injectors. Low impedance injectors have a resistance of 2-3 ohms throughout the injector coil.
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Accurate injector data is key for a tuner to control the fuel injector
Fuel injectors have evolved to be more precise in their control of fuel metering and the air-fuel ratio. The physical size of fuel injectors has also diminished, allowing for creative placement options.
There are three sections of data provided on the Data Match sheet: slope flow rate matching, injector offset (delay) matching, and voltage offset matching. The first ensures a consistent air-fuel ratio across each cylinder, the second ensures that the opening and closing rate is similar for each injector to keep fuel delivery consistent, and the third is used by the tuner to set the starting point for battery/ignition latency compensation at various system voltages and fuel pressure settings.
It is important to note that the way that the data will need to be formatted and converted will vary from vehicle to vehicle, and even within the same manufacturer and vehicle generation. This is because not all ECUs are created equal, and the formatting of the software and the units used will depend on the engineer who wrote the factory code.
When selecting a fuel injector, it is important to confirm that the manufacturer provides accurate injector data. This will make the job of a tuner much easier, as they won't have to spend time developing the injector characterization data. Injector Dynamics is a good example of a brand that provides excellent accurate injector data in various formats.
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Frequently asked questions
There are a few ways to determine the size of your fuel injectors. Firstly, you can physically measure the injectors, with the most common sizes being 34mm, 48mm, and 60mm. Secondly, you can refer to the injector data, which includes information such as the dead time, or lag, between the computer sending a pulse and the injector opening. Thirdly, you can use a fuel injector calculator, which will recommend a size based on factors such as horsepower, fuel type, and induction type. Finally, you can refer to the injector plug style, with the most common styles being EV1 (Jetronic), EV6 (USCAR), and Denso (Sumitomo).
Sizing fuel injectors larger can be beneficial if you plan to boost the power in the future. Larger injectors can provide enough additional fuel flow to offset a minor power increase, ensuring that the injector can still perform properly.
The industry standard for fuel injector flow rate sizing is 43 psi/3 bar. However, it's important to note that some manufacturers may choose a different rate depending on the specific application.
The fuel injector directly impacts the air-fuel ratio (AFR) or parts fuel to airflow entering the engine. To maintain good combustion and torque/power production, you need to achieve the proper AFR. The relationship between horsepower and fuel injector flow rate can be understood using the term BSFC (brake-specific fuel consumption), where a lower BSFC number indicates greater engine efficiency.
