Rajan Wilcox
The Subaru WRX STI is a powerful car with a 2.5L turbocharged 4-cylinder engine. Many owners of this vehicle are always looking for ways to enhance its performance. One effective way to do this is by installing an eFlexFuel kit to run E85 flex fuel, which is a blend of 85% ethanol and 15% gasoline. E85 fuel offers increased horsepower, cleaner emissions, and cost savings. However, before making the switch, it is important to ensure that your vehicle's fuel delivery system can handle the transition. This includes upgrading the fuel pump and fuel injectors to accommodate the increased fuel flow required for E85. With the right modifications and guidance, you can successfully upgrade your Subaru WRX STI to run on E85 fuel and unlock its full potential.
| Characteristics | Values |
|---|---|
| Fuel type | E85 |
| Fuel blend | 85% ethanol and 15% gasoline |
| Benefits | Increased horsepower, cleaner emissions, cost savings |
| Fuel volume | Requires 30-35% more volume than regular gasoline |
| Fuel injectors | Require upgrade to accommodate increased fuel flow |
| Fuel pump | Requires upgrade to a high-flowing ethanol-compatible fuel pump |
| Fuel pressure regulator | Requires upgrade |
| Fuel system kits | IAG Fuel System kits, eFlexFuel kits, eFlexPro kits |
| Engine management systems | COBB's V3 Accessport |
| Fuel conversion kits | 2015-2017 WRX STi, 2018-2021 WRX STi |
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What You'll Learn
- E85 fuel's higher ethanol content requires more volume than regular gasoline
- E85 fuel's higher octane rating allows for more aggressive tuning
- E85 burns cleaner than gasoline, reducing carbon emissions
- E85 is a cost-effective alternative to gasoline
- E85 conversion kits are available for the Subaru WRX STI
E85 fuel's higher ethanol content requires more volume than regular gasoline
E85 is a type of flex fuel that typically consists of 85% ethanol and 15% gasoline. The ratio of ethanol to gasoline can vary depending on the region, manufacturer, and time of year. During winter, the ethanol content is reduced to avoid cold-starting issues, with some regions mandating a blend of 70% ethanol and 30% gasoline.
E85 fuel requires approximately 30-35% more volume than regular gasoline for an engine to run properly. This is because the energy content of ethanol is about 33% less than that of pure gasoline. As a result, vehicles typically experience a reduction in fuel economy when using E85. For example, FFVs operating on E85 may achieve 15-27% fewer miles per gallon compared to regular gasoline.
To accommodate the increased fuel flow required by E85, several mechanical upgrades are necessary for a Subaru WRX STI. Firstly, the stock fuel injectors need to be upgraded to larger-capacity injectors to ensure adequate fuel delivery. Secondly, the OEM fuel pump needs to be replaced with a high-flowing ethanol-compatible fuel pump to meet the higher flow demands of E85. Additionally, an upgraded fuel pressure regulator is recommended to maximize the efficiency of the fuel delivery system.
While E85 requires more volume than regular gasoline, it offers several benefits. E85 burns cleaner and cooler, resulting in reduced wear and tear on the engine and improved resistance to detonation. It also has a higher octane rating, enabling higher compression and more aggressive tuning, which translates to increased horsepower and better performance on the road. Furthermore, E85 is often cheaper than regular gasoline, making it a cost-effective option for race fuel.
In summary, while E85 fuel requires a larger volume than regular gasoline due to its higher ethanol content, it offers enhanced performance, reduced emissions, and cost savings. To utilize E85 in a Subaru WRX STI, specific upgrades are necessary to ensure the engine's fuel delivery system can handle the increased fuel flow and optimize performance.
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E85 fuel's higher octane rating allows for more aggressive tuning
E85 is an abbreviation for an ethanol fuel blend of 85% ethanol and 15% gasoline or other hydrocarbons by volume. The higher the compression and boost applications, the higher the performance of E85 fuel. This is because E85 has a higher octane rating than regular gasoline, which typically has an octane rating of 87. Premium gasoline has an octane rating of 91-93, while E85's octane rating ranges from 100-113.
The higher octane rating of E85 allows for more aggressive tuning, which means your engine can handle higher compression and will produce more power per unit of displacement. This is achieved by maximising the engine to take advantage of E85's higher octane rating. The higher octane rating also makes E85 a good power adder in turbocharged performance vehicles.
E85 is a popular choice for performance motoring enthusiasts and motor racing clubs/championships. It is also used extensively in countries like Australia, where it is always 85% ethanol. E85 is a good option for those seeking higher horsepower, cleaner emissions, or cost savings. It burns cleaner and cooler than regular gasoline, which can lead to less wear and tear on your engine over time.
However, it is important to note that E85 requires approximately 30-35% more volume than regular gasoline for your engine to run properly. This means that certain upgrades are necessary to accommodate the increased fuel flow, such as upgrading the fuel pump and fuel injectors.
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E85 burns cleaner than gasoline, reducing carbon emissions
E85 is an ethanol-based fuel blend that typically consists of 85% ethanol and 15% gasoline. It is a popular choice for those seeking to increase the horsepower in their vehicles, such as the Subaru WRX or STI, due to its higher octane rating.
One of the key advantages of E85 is that it burns cleaner than gasoline, resulting in reduced carbon emissions. This is because ethanol, when completely burned, only produces carbon dioxide and water, whereas gasoline combustion produces a complex mixture of hydrocarbons and other compounds, including aliphatic and aromatic hydrocarbons. These hydrocarbons are considered harmful emissions and contribute to air pollution.
The cleaner burning properties of E85 lead to less wear and tear on your engine over time. Additionally, the production of ethanol is more environmentally friendly than that of gasoline. The US Department of Energy highlights how the carbon dioxide released when ethanol is burned is offset by the carbon dioxide captured during the growth of feedstock crops used to produce ethanol. In contrast, gasoline and diesel are derived from petroleum extracted from the earth, resulting in no emissions offset during combustion.
However, it is important to note that there is a dispute regarding the carbon emissions created during the manufacturing process of ethanol from corn. While ethanol itself is a zero-carbon emission fuel, the process of converting corn into ethanol requires energy, which may contribute to carbon emissions. Nevertheless, the overall environmental impact of E85 is still considered positive due to its cleaner burning properties and the potential for innovations to further reduce its carbon footprint.
To use E85 in a Subaru WRX or STI, some mechanical upgrades are necessary, including upgrades to the fuel injectors and fuel pumps to accommodate the increased fuel flow required by E85. Additionally, adjustments to the engine's tune are essential to ensure proper operation on both E85 and regular gasoline.
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E85 is a cost-effective alternative to gasoline
E85 is an ethanol-based fuel blend that is a cost-effective alternative to gasoline. It is a renewable, homegrown alternative to gasoline that has been promoted by the federal government for decades. E85 contains anywhere from 51% to 85% ethanol, with the remaining percentage consisting of gasoline. This higher ethanol content makes it a cheaper alternative to gasoline. In January 2010, E85 cost $2.38 a gallon on a nationwide average basis, compared to $2.65 a gallon for regular gasoline.
However, it is important to note that E85 requires approximately 30-35% more volume than regular gasoline for your engine to run properly. This increased fuel volume means that certain modifications are necessary, such as upgrading your fuel injectors and fuel pump. Despite these modifications, E85 can still be a cost-effective option, especially with the right eFlexFuel system in place.
The versatility of E85 is another factor in its cost-effectiveness. With an eFlexFuel kit, your Subaru WRX STI can run on both E85 and regular gasoline. This flexibility allows you to switch between the two fuels depending on availability and price. You can take advantage of the performance benefits of E85 while also having the option to use gasoline when E85 is not available or if it is more cost-effective in certain regions or at certain times of the year.
In summary, E85 is a cost-effective alternative to gasoline due to its lower price, increased horsepower, cleaner burning properties, and versatility. While there may be some initial costs associated with modifying your engine's fuel delivery system, the potential for cost savings and improved performance make E85 a viable option for many vehicle owners.
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E85 conversion kits are available for the Subaru WRX STI
The eFlexFuel kit is one popular option for converting a Subaru WRX STI to run on E85. This kit is designed for the 2014-2021 model years of the WRX STI and can boost horsepower by up to 20%. The eFlexFuel kit allows the car to take advantage of the higher octane rating of E85, which enables the engine to handle higher compression and more aggressive tuning. This results in improved performance on the road. Additionally, the eFlexFuel kit provides the flexibility to switch between E85 and regular gasoline depending on availability and price.
Another option for converting a Subaru WRX STI to E85 is the Cobb Tuning Flex Fuel Kit, which integrates with the ECU and the Cobb Tuning Accessport. This kit allows for easy adjustments to fuel calibrations and can accommodate high ethanol content. The Cobb V3 Accessport enables users to toggle between saved maps and make quick adjustments on the fly, even while the engine is running.
It is important to note that converting to E85 may require additional upgrades to the fuel delivery system, including fuel pumps, fuel injectors, and fuel pressure regulators. These upgrades are necessary to accommodate the increased fuel flow required by E85, which is approximately 30-35% more than regular gasoline. A skilled tuner may also be required to adjust the fuel and calibrate the system for optimal performance.
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Frequently asked questions
E85 is an ethanol-based fuel blend that is supposed to be 85% ethanol and 15% gasoline. It burns cleaner and cooler than regular gasoline, has a higher resistance to detonation, and is a cost-effective option for race fuel.
E85 can increase horsepower, reduce your carbon footprint, and lead to cost savings.
You will need to upgrade your fuel injectors and fuel pump to accommodate the increased fuel flow required by E85. You may also need to upgrade your fuel pressure regulator and other parts of your fuel delivery system. Additionally, you will need to adjust the tune for the bigger injectors and the ethanol content.
Yes, there are E85 conversion kits available for the 2014-2021, 2015-2017, and 2018-2021 Subaru WRX STI that can allow your car to run on both E85 and regular gasoline. These kits can boost horsepower by up to 20%.
You can use a dedicated app or search online to find nearby E85 fuel stations.
