How Does the eFlexFuel kit work?
The most advanced flex-fuel systems on the planet
eFlexFuel systems install under-the-hood and enable your vehicle to operate with E85 in the tank, gasoline in the tank, or any mixture of these two fuels in the tank. No user inputs are required as the system automatically adjusts to the exact blend of fuel in your vehicle. Vehicle operation is seamless on both fuels, running just as it did before installing eFlexFuel – except now you can fill up with E85 and enjoy a healthy performance boost and emissions reduction when running this environmentally friendly fuel.
eFfexFuel expands your vehicle’s fueling capabilities
eFlexFuel systems work in conjunction with your vehicle’s ECU to deliver precise fueling for gasoline, E85, and any mixture of these two fuels. To accomplish this, eFlexFuel analyzes the fuel’s ethanol content over 100 times per second while processing each injector’s native fueling signal. This data is combined to yield optimized injector output for the current ethanol-gasoline blend. As the fuel blend changes, eFlexFuel instantaneously adapts with it. eFlexFuel’s fuel delivery adjustments are real-time, seamless, and fully automatically, providing ultimate drivability regardless of fuel.
+ Is eFlexFuel user friendly? It does not get any easier than this
Because eFlexFuel systems dynamically adjust fueling without user input, the system could not be any easier to use: if you are near an E85 pump, fill up with E85; if only gasoline is available, fill up with gasoline. It doesn’t matter which fuel was in your tank before or how much you are filling up - you can grab either the E85 or gasoline handle and you are good to go.
+ Can you really mix e85 and gasoline together with eFlexFuel? Yes, and here is why
E85, Gasoline, and eFlexFuel in Simple Terms
Yes, you can mix E85 and gasoline together with an eFlexFuel kit installed. To understand why this is okay, you must understand the basics of E85 and gasoline. These two fuels are essentially made up of the same two ingredients but in different ratios: ethanol and gasoline.
Gasoline: Virtually all gasoline in the United States contains 10% ethanol. This means gasoline from the pumps is actually 10% Ethanol and 90% gasoline, which you can call “E10”.
E85: E85 is made up of 85% ethanol and 15% gasoline. (The exact ethanol % in E85 can vary, but we will use an exact 85% for this example)
Because both E85 and gasoline are made up of the same two ingredients, mixing gasoline (10% ethanol + 90% gasoline) with E85 (85% ethanol + 15% gasoline) simply changes the final ratio between ethanol and gasoline. This is why you can have a half tank of E85 and fill up the remainder with gasoline (E10) and the two naturally combine without issue: you are just forming a new ethanol-gasoline ratio in your tank. In this case, the resulting ethanol blend would be around E47.
As ethanol percentage increases, so does the volume of fuel required for operation. eFlexFuel kits utilize an ethanol sensor to analyze the fuel’s ethanol content over 100 times per second. Regardless of whether you have gasoline (E10), E85, or any other ethanol-gasoline mixture in your tank (E15, E50, E67, E-”anything”), the eFlexFuel system ensures ideal fueling and operation.
In other words, you don't have to think about it with eFlexFuel - simply refuel with E85 or gasoline and go!
+ Reliable fueling that works with your vehicle’s ECU, not against it
In basic terms, your vehicle is constantly making fuel adjustments to achieve a “target” exhaust gas composition (the result of an air-to-fuel mixture). The vehicle’s ECU utilizes feedback from sensors in the exhaust to make fueling corrections, ensuring engine safety and emissions control. In stock form, your vehicle can only achieve its “target” exhaust gas composition with gasoline.
eFlexFuel systems work with your vehicle’s ECU by enabling the fuel system to make larger adjustments to accommodate for a wider range of ethanol-gasoline blends. This allows the vehicle’s ECU to reach its “target” exhaust gas composition (the result of an air-to-fuel mixture) not only for gasoline, but also for E85 and all mixtures of gasoline-and-E85.
This is all achieved without making any modifications to the vehicle’s ECU programming whatsoever. Because the ECU is untouched, the Original Manufacturer engine safety and emissions control systems remain fully intact, ensuring safe operation at all times.
Increased performance thanks to E85 + eFlexFuel
Running E85 with eFlexFuel installed results in increased horsepower, torque, and overall engine performance thanks to several factors working together.
Performance
E85 facts
- E85 is approximately 30% oxygen by weight, while normal gasoline is anywhere from 0-3.5% oxygen. Greater fuel oxygenation means more fuel and more complete combustion, leading to more power.
- Ethanol absorbs heat during vaporization, leading to reduced air temperatures when the air-fuel mixture ignites.This charge cooling effect creates a modest power increase while supporting ethanol’s knock resistance.
- The higher chemical octane of E85 reduces the risk of knock. When combined with ethanol’s charge cooling effect, E85 is highly knock resistant, with virtually zero knock under normal operating conditions; the same cannot be said for gasoline. As a result, the vehicle’s ECU does not need to retard ignition (pull timing) while running E85.
- Ethanol burn properties affect cylinder pressure, increasing power:
- There is less ignition delay (from spark to burning) with ethanol.
- Ethanol’s flame front propagation is faster.
- These burn properties result in cylinder pressure rising faster, increasing efficiency and power.
- Turbocharged engines also benefit from higher exhaust gas flow from E85, resulting in quicker turbo spool.
eFlexFuel: summing it all up
- eFlexFuel kits install in your engine bay and enable your vehicle to safely run on E85, gasoline, and all mixtures of E85-and-gasoline.
- eFlexFuel systems are fully automatic, requiring zero user input, and do not touch your vehicle’s ECU programming, ensuring all Original Manufacturer engine safety and emissions control systems maintain operation as originally designed.
- Running E85 via eFlexFuel guarantees improved engine performance.
- Expertly engineered, designed, and manufactured in Finland, eFlexFuel kits boast an industry leading 5-year warranty with technical capabilities surpassing any peers.
Put simply, eFlexFuel kits are the most advanced flex-fuel systems on the planet.
