Rajan Wilcox
The 2015+ S550 Mustang is a powerful car, and some owners want to push it further by running it on E85 fuel. E85 has a higher octane rating than pump gas, which means the potential for more power. However, there is conflicting information about whether the stock fuel injectors can handle the increased fuel volume required by E85. Some owners have reported running E85 on their S550s with stock injectors without any issues, while others have warned against it, saying that an injector upgrade is necessary to handle the extra fuel safely. So, can the S550 run E85 with stock fuel injectors? The answer is not clear-cut, and more evidence and technical details are needed to come to a conclusion.
Can S550 run E85 with stock fuel injectors?
| Characteristics | Values |
|---|---|
| Can S550 run E85 with stock fuel injectors? | Yes, but it is not recommended. |
| Fuel injectors required for E85 | Ford 47# injectors |
| Fuel mass | 25% greater than stock |
| Fuel flow capability | Must be upgraded |
| Fuel type | Quality E85 |
| Fuel efficiency | 8mpg |
| Fuel tables | Must be changed |
| Fuel ratio | Must be checked |
| Fuel injector upgrade | Must be done for GT 350 IM |
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What You'll Learn
Some say stock injectors are fine for E85
There are a variety of opinions on the web regarding the use of stock fuel injectors with E85. Some people claim that they have been using stock injectors with E85 without any issues. One user with a completely stock fuel system claims to have been making around 540whp NA on E85 with no issues. Another user claims that they have been running E85 with an axle back and a K&N panel filter with no issues.
However, it is important to note that there are also many people who advise against using stock fuel injectors with E85. Some people have reported issues with their cars, such as "inadequate fuel flow" and "fill-up anxiety" due to low mpg. It has been suggested that using stock injectors with E85 may not be safe and that it is better to invest in larger injectors to avoid any potential issues.
There is also a discussion about the energy density of E85 being lower compared to pump gas, which means that more fuel needs to be burned to get the same amount of energy. This could potentially lead to issues with the timing of the fuel injection and the need for bigger injectors.
Overall, there is conflicting information on the web regarding the use of stock fuel injectors with E85 in an S550. While some people claim that it works fine for them, others have reported issues and advise upgrading to larger injectors. It is important to do thorough research and consult with experts before making any decisions regarding fuel and injector systems.
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Others say injector upgrades are a must for E85
While some people claim that it is possible to run E85 on stock fuel injectors, others insist that injector upgrades are essential for safe and effective use. This is because E85 fuel has a lower power density than pump gas, so more fuel needs to be burned to generate the same amount of energy. As a result, stock injectors may not be able to deliver enough fuel, leading to potential performance issues and even engine damage.
Upgrading to larger injectors, such as 30% larger injectors, can ensure that the engine receives the necessary amount of fuel when running on E85. This is a relatively inexpensive modification that can provide peace of mind and help prevent maxing out the stock injectors. Additionally, upgrading injectors can improve the overall performance and power output of the vehicle.
Some people argue that running E85 on stock injectors can be risky, especially for those with high-flow intake manifolds or certain engine configurations. In some cases, it may lead to inadequate fuel flow, lean fuel trims, or other issues. Upgrading the injectors can help avoid these problems and ensure a more reliable and efficient fuel delivery system.
Furthermore, when converting a vehicle to run on E85, it is crucial to consider the entire fuel system. Upgrading the fuel injectors alone may not be sufficient, and other components such as the fuel pump, fuel lines, and even the engine tuning, may need to be modified or replaced. Consulting with a professional or experienced tuner can help identify the specific requirements and modifications needed for a safe and successful conversion.
While there are varying opinions on the necessity of injector upgrades when running E85, prioritizing safety and performance is essential. Upgrading fuel injectors can provide several benefits, including increased fuel flow, improved performance, and reduced risk of engine damage. For those considering running E85, it is important to weigh the potential advantages and disadvantages and make an informed decision based on their specific vehicle and usage.
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E85 has an average octane of 105
It is not recommended to run E85 on stock injectors in an S550. This is because the fuel mass is 25% greater than stock, and there is a risk of maxing out the stock injectors. However, some users have reported running E85 on stock fuel injectors with no issues.
E85 has an average octane rating of 105, and it is often used as racing fuel due to its high octane. The high octane rating of E85 allows it to be used in higher-compression engines, which tend to produce more power per unit of displacement than their gasoline counterparts. The octane rating of E85 can vary, with some sources citing a range of 100-105, while others list ratings of 112 or 114. The octane rating of gasoline typically falls between 87 and 93.
The high octane rating of E85 is due to its high ethanol content, which can be as high as 85% in some countries. Ethanol naturally has a high octane rating, and it also has better combustion characteristics, such as high thermal efficiency and raised torque. This results in increased power and torque in vehicles using E85, with some engines showing a power improvement of up to 40%.
In addition to its high octane rating, E85 also has several other benefits over gasoline. E85 burns cleaner and produces fewer emissions, with up to 80% less emissions depending on how it is made and the ethanol content. It also does not leave any carbon deposits in the engine and can even clean out existing carbon deposits, reducing the need for maintenance. E85 is also usually cheaper than gasoline and high-end racing fuels, making it a cost-effective option for many drivers.
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E85 has lower energy density than pump gas
E85 has a lower energy density than pump gas, which means that you need to burn more fuel to get the same amount of energy. This is important to consider when thinking about whether an S550 can run E85 with stock fuel injectors.
While it is technically possible to run E85 with stock fuel injectors in an S550, it is not recommended by many mechanics and tuners due to the higher fuel mass required. The stock fuel injectors may not be able to keep up with the increased fuel demand, leading to potential performance and reliability issues.
One of the main issues is that the stock fuel injectors may not be able to deliver enough fuel at higher RPMs, causing the car to lean out and potentially damaging the engine. Additionally, the increased fuel flow can lead to fill-up anxiety due to lower miles per gallon, as well as the limited availability of E85 fuel stations.
Some people have reported running E85 with stock fuel injectors in their S550s without any issues. However, it is important to note that this may not be the case for all vehicles, and it is always a good idea to consult with a professional before making any fuel or engine modifications.
To address the lower energy density of E85, an injector upgrade is often recommended. Larger injectors can deliver more fuel, helping to compensate for the lower energy density and ensuring that the engine receives the fuel it needs, especially at higher RPMs. This can help improve performance and reliability when running E85.
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E85 is not available in the UK
It is not recommended to run E85 on stock fuel injectors in an S550. While some users have reported doing so without issues, others have warned against it, citing potential issues with inadequate fuel flow and lean fuel trims. It is generally advised to upgrade the fuel injectors and fuel flow capability when using E85 to avoid these problems.
However, it is important to note that E85 is not readily available in the UK, which may alleviate any concerns about using this fuel type with stock fuel injectors in an S550. E85 was launched in the UK in 2006 by the Morrisons supermarket chain, but it did not gain widespread adoption. As of now, E85 is only available at a small number of outlets in the country.
E85, an abbreviation for a fuel blend of 85% ethanol and 15% gasoline, has become increasingly common in the United States, particularly in the Midwest, where corn is a major crop for ethanol production. It is also widely used in Sweden, although most of it is imported from Italy and Brazil. In France, about 30% of gas stations supply E85, and the number of flex-fuel kits installed has been growing.
In contrast, the availability of E85 in the UK is extremely limited. While it was introduced by Morrisons in 2006, it failed to gain traction, and currently, only a handful of outlets offer it. This lack of availability means that UK residents with S550s need not worry about running E85 with stock fuel injectors, as it is not a feasible option for regular use.
It is worth noting that E85 has different properties than pump gas, including a lower energy density, which means that more fuel needs to be burned to achieve the same amount of energy. This can affect the timing of fuel injection and may require bigger injectors to accommodate the increased fuel flow. However, with E85 being largely inaccessible in the UK, this is not a concern for S550 owners in the country.
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Frequently asked questions
Yes, S550 can run E85 with stock fuel injectors. However, it is recommended to switch back to 91/93 octane occasionally or use an E85 additive to prevent clogging and maintain reliability.
Running E85 on stock fuel injectors may lead to "fill-up anxiety" due to lower mileage and limited fuel stations. It is also important to ensure the use of quality E85 to maintain reliability and prevent moisture build-up.
Yes, an injector upgrade is an alternative option. An injector upgrade may be necessary, especially when using a GT 350 intake manifold, to prevent maxing out the stock injectors.
It is recommended to use a flex fuel tune, such as the Lund Flex Fuel tune, to optimize performance. Additionally, downloading apps like Gas Buddy or Alternative Fuel Finder can help locate E85 stations.
