Mercedes Mullins
Upgrading to larger fuel injectors is a common way to increase horsepower and improve engine performance. While it is possible to install bigger fuel injectors on a stock WRX, it is important to note that this modification may require additional tuning to ensure the engine runs smoothly. The stock fuel injectors on a WRX are typically sufficient for most applications, but upgrading to larger injectors can provide benefits for certain performance goals. It is recommended to consult with a tuning specialist to determine the appropriate fuel injectors and any necessary adjustments to the engine tuning.
| Characteristics | Values |
|---|---|
| Benefits of upgrading fuel injectors | Increase engine power, increase horsepower, prepare for future expansion turbo-wise |
| Drawbacks of upgrading fuel injectors | Engine problems, dirty fuel injectors, worsened fuel economy, poor engine performance |
| Fuel injectors to avoid | DW injectors |
| Fuel injectors to consider | FIC or ID injectors, 750CC, 650CC, 725CC, 1700CC |
| Fuel pumps to consider | Walbro 255lph pump, E85 fuel pump |
| Other components to consider | E85 sensor, turbo back exhaust, AEM intake, Perrin turbo back exhaust, Cobb turbo inlet, Cobb electronic boost solenoid |
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What You'll Learn
Injector size and capacity
For example, in a boosted engine with injectors in the intake manifold, higher pressures are required to open the injectors compared to a normally aspirated engine. As a result, the fuel pressure in the fuel rail decreases, and a fuel pressure regulator is necessary to compensate. This regulator senses the pressure in the intake manifold and adjusts the fuel pressure accordingly.
When considering injector size, it is essential to account for the fuel pump's capacity to deliver fuel at the required pressure. The fuel pump must be able to provide sufficient fuel flow to meet the engine's demands. For instance, the Walbro 255lph pump is a common upgrade for stock engines with stock turbos, offering an affordable option to prevent the engine from running lean.
Additionally, the type of fuel used influences injector size and capacity requirements. E85 fuel, for instance, demands a much larger injector due to its higher BSFC number. E85 fuel pumps are also more expensive but offer the advantage of being less prone to corrosion and knock, allowing tuners to push the limits of boost.
In the context of a WRX, sources indicate that stock fuel injectors can support power outputs up to 300whp. However, when aiming for higher power levels or planning to upgrade to a larger turbo, injector upgrades become necessary. For instance, 725 or 750cc injectors are commonly recommended for stock setups, while some WRX owners opt for larger injectors, such as the Injector Dynamic 1050s, to accommodate their performance goals.
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Fuel pump compatibility
When considering fuel pump compatibility for bigger fuel injectors on a stock WRX, several factors come into play. Firstly, the fuel pump's flow rate is crucial. A pump with a suitable flow rate will ensure that the larger fuel injectors receive an adequate fuel supply, preventing the engine from running lean. This is particularly important when increasing the amount of boost or air in the engine, as it needs to be balanced with a corresponding increase in fuel flow to maintain the optimal air-fuel mixture ratio.
Compatibility with factory fuel sending units/tanks is another key consideration. The fuel pump must be designed to work seamlessly with the existing fuel system components in your WRX. This includes ensuring that the fuel pump can deliver fuel effectively to the injectors without any compatibility issues. Additionally, the reputation for longevity of the fuel pump is worth examining. A fuel pump with a proven track record of durability will enhance the reliability of your vehicle.
In some cases, the amperage draw of the fuel pump may be a factor, especially in extreme scenarios. This refers to the electrical current drawn by the pump, and it can impact the overall electrical system of the vehicle. It is also worth noting that while a larger fuel pump does not directly increase the fuel richness, it does enable the delivery of more fuel when higher boost or larger injectors are utilised. This highlights the interplay between the fuel pump and the fuel injectors in maintaining optimal engine performance.
For a stock engine with a stock turbo, the Walbro 255lph fuel pump is a popular upgrade option. It is relatively inexpensive and capable of handling enough fuel flow to support up to 450 crank horsepower. This pump is also compatible with the factory wiring harness in most cases. If you are considering heavy-duty tuning or upgrading to a larger turbo, an E85-compatible fuel pump and injectors may be worth investing in. E85 fuel is less prone to knock, allowing tuners to push the limits of boost beyond what regular octane fuel can achieve.
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Tuning requirements
Upgrading to bigger fuel injectors can increase engine power and is a popular method for car enthusiasts to increase horsepower without extensive modifications. However, simply adding bigger fuel injectors without tuning the engine may result in engine problems. The engine requires the right air/fuel ratio to operate at maximum power. If the engine receives too much fuel and not enough air, it will run too rich, and if it gets too much air and not enough fuel, it will run too lean, with both scenarios leading to engine issues.
To avoid these problems, it is recommended to tune the engine and adjust the fuel map when installing larger injectors. This process involves tweaking the fuel map to inform the ECU (engine control unit) that a greater amount of fuel is entering the engine. The ECU will then be able to manage the increased fuel flow and prevent issues such as spark plug damage or engine misfires.
Additionally, when considering tuning requirements, it is essential to select the appropriate fuel pump and injectors based on the amount of boost you intend to run. The most common fuel pump upgrade for a stock engine with a stock turbo is the Walbro 255lph pump, which is relatively inexpensive and can manage the fuel flow for up to 450 crank horsepower.
Furthermore, if you plan on heavy-duty tuning or swapping to a larger turbo, you may need a fuel pump that can run E85 fuel. E85 fuel pumps tend to be more expensive but are resistant to corrosion from E85 fuel. They also allow tuners to push the limits of boost beyond what 91 or 93 octane fuel can deliver. As for injectors, 750CC is typically the largest size used with stock engines, providing ample flow to prevent the engine from running lean.
In summary, while upgrading to larger fuel injectors can enhance engine power, it is crucial to consult a specialist and consider the specific tuning requirements for your vehicle, including the choice of fuel pump and injectors based on your desired boost level.
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Turbocharger upgrades
When it comes to upgrading the turbocharger on a stock WRX, there are a few key considerations and options to explore. Firstly, it's important to understand the limitations of the stock turbocharger. The factory turbocharger has restricted airflow capability at high RPMs, which can limit horsepower. Upgrading to a larger turbocharger can address this issue and significantly increase horsepower.
There are two common types of turbocharger upgrades: "stock location" turbos and "rotated mount" turbos. A "stock location" turbo directly replaces the stock turbo, fitting in the same space and connecting to the stock or stock location downpipe. This option typically requires no additional modifications to the intake and exhaust piping. On the other hand, a "rotated mount" turbo is larger and must be pivoted to the side to avoid the intake manifold. While this option generally produces more horsepower, it requires new components, including an up pipe, downpipe, and intake plumbing, as well as an external wastegate. The "rotated mount" solution tends to be more expensive due to these additional parts and modifications.
When upgrading the turbocharger, it is crucial to consider the fuel injectors and fuel pump. The increased airflow and boost pressure of a larger turbocharger demand more fuel, so upgrading the fuel injectors and fuel pump is essential to ensure sufficient fuel delivery. For direct-injection cars like the 2015+ WRX, only the low-pressure fuel pump in the fuel tank may need an upgrade, as the high-pressure pump and fuel injectors can usually handle the increased demand. However, for other models, both the fuel injectors and fuel pump may need to be upgraded.
Several options are available for turbocharger upgrades on the WRX. Popular choices include the Blouch TD5H-16GXT 7cm turbocharger, the Forced Performance Blue HTZ Turbocharger, and the Steamspeed STX 67 turbocharger. These upgrades can provide significant boosts in horsepower and performance. Additionally, the Tomei ARMS M796 turbocharger is a great option for those seeking more power in the Mitsubishi Evolution.
When upgrading the turbocharger, it is always recommended to consult with a professional and ensure that the supporting parts and tuning are appropriate for the larger turbo. This includes considering the fuel injectors, fuel pump, and other components to ensure they can handle the increased demands of the upgraded turbocharger.
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Engine performance
Firstly, it is important to understand the role of fuel injectors in the engine's performance. Fuel injectors are responsible for delivering a precise amount of fuel to the engine's cylinders, where it is mixed with air and ignited to produce power. The size and flow rate of the fuel injectors play a crucial role in this process, as they directly impact the amount of fuel that enters the cylinders.
By installing larger fuel injectors, you are essentially increasing the potential fuel flow to the engine. This can have several effects on the engine's performance. Firstly, it can increase the engine's power output by providing more fuel to the cylinders, resulting in larger explosions and greater horsepower. This is particularly beneficial for high-performance applications or when other modifications have been made to the engine that require additional fuel.
However, there are also potential drawbacks to consider. Larger fuel injectors can affect the engine's fuel economy, as they may deliver more fuel than is necessary for normal driving conditions. This excess fuel is not used efficiently and can result in increased fuel consumption and higher operating costs. Additionally, larger fuel injectors may require other supporting modifications to be made to the engine, such as upgrades to the fuel pump or tuning adjustments, to ensure optimal performance and avoid potential issues.
It is also important to consider the potential impact on the engine's reliability and longevity. While larger fuel injectors can provide performance benefits, they may also place additional strain on the engine's components. This can lead to increased wear and tear, potentially reducing the engine's lifespan if not properly managed. Therefore, it is crucial to carefully research and consider the implications of any modifications before proceeding.
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Frequently asked questions
Upgrading to bigger fuel injectors is a great way to give your engine more power and increase horsepower without having to do more extensive modifications.
The size of the injectors depends on the amount of boost you intend to run. 750CC is about as high as most people want to go with their stock engines.
If your engine gets too much fuel and too little air, it will run too rich. If the opposite happens (too much air and too little fuel), the engine will run too lean. Both scenarios can lead to engine problems.
Tuning your engine can be crucial to keeping your engine running smoothly and making as much power as possible. However, some vehicles have the ability to automatically adjust to larger injectors.
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