You will find that ethanol content varies from station to station and it even varies at the same station with different loads containing different ethanol content. The problem is that E85 is extremely inconsistent. Unfortunately, it's still not that easy…Ī good tuner will be able to dial in your car and get you running on E85, no problem. A skilled tuner will be able to look at the car on a dyno and adjust the fuel until it is just right, calibrating everything to run efficiently and clean giving you a nicely running car that is now capable of considerably more power on this E85 magic fuel. This is where a skilled tuner comes in handy. Depending on the percentage of ethanol, a different amount of fuel will need to be delivered and the ECU on your EJ powered WRX or STI has no clue what is in your tank. And, not only do you have to adjust the tune for the bigger injectors in order to make sure they operate properly on regular gasoline, you also have to adjust for the ethanol content.
That’s not so hard… Hold up a sec, we are missing something…Īt this point, you must address the tune! Your ECU won’t know what to do with itself when all of the sudden the mechanical parts are flowing so much more fuel through the system. So, you are just three mechanical part upgrades away from being able to run E85.
It's much easier to make power on E85 if you have the appropriate fueling modifications. The benefit is that you can make that power with a bigger margin of safety for your engine. Want to know WHY you need so much more E85 fuel when compared to gasoline? See our blog post about how E85 works and what makes it such a great performance fuel - The Magic of E85.Īs you can see in the table, you need much bigger injectors to push an E85 fueled car to higher horsepower. Whether you are making 300hp or 600hp on regular gasoline, if you plan to switch to E85, you will need at least 30% more fuel headroom to do so. If you are running a bigger turbo, then you need bigger injectors, regardless. When upgrading these parts you also have to keep in mind what your pump gas fuel demands will be. There are plenty of other items that you can upgrade as well in order to cover all bases, but these three parts are the main contenders and the most necessary to upgrade. When sustaining more fuel flow, maximizing the efficiency of your fuel delivery system is a must and an upgraded fuel pressure regulator is necessary. I n most cases, i njectors that can be maxed out on regular gas when run hard enough do not have the headroom to flow an additional 30% of fuel and will also need to be replaced. Fuel pumps can’t flow enough to support 30% more fuel reliably and need to be replaced. Since so much more fuel is required when running E85, the first limits you are going to reach are with the hard parts. And thanks to advances in tuning and the aftermarket, it has never been easier to make power running it in your WRX or STI.
With it becoming more and more readily available, switching to E85 has never been easier to do.
The reason you can’t just fill your EJ Powered WRX or STI up and go is because E85 requires about 30 to 35% more fuel than regular gasoline to run right. E85 was intended to reduce the consumption of fossil fuels, but due to its much higher octane and oxygenating ability, it has quickly become an excellent source for cheap and easy to find race gas. First of all, what is E85 and why does it require a “switch” to run on your WRX or STI?Į85 is an ethanol based fuel that is supposed to be 85% ethanol and 15% gasoline.
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