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What is Flex Fuel? Flex fuel is exactly what it sounds like—flexible fuel. When adding ethanol (E85 or any blend) to your tank, the ECU must recognize the ethanol content using a flex fuel sensor. This sensor allows the ECU to determine the exact ethanol percentage in your fuel. As ethanol content changes, the ECU automatically adjusts key parameters such as: Fueling Ignition timing Boost control This creates a seamless transition between fuel types. The ECU accomplishes this by interpolating between the E10 and E85 calibration tables, smoothly adjusting fueling, ignition, and boost based on the ethanol content in the...

By purchasing or using race engines, components, or parts from 1:1 Tuning LLC , the customer acknowledges and agrees to the following terms: No Warranty: All race engines, parts, and components sold are intended for off-road, racing, and performance use only. These products are sold "as-is" without any express or implied warranty of any kind, including but not limited to the implied warranties of merchantability or fitness for a particular purpose. Usage Risks: Racing and high-performance applications involve significant risks, including the potential for engine failure, parts failure, or other damage. The customer assumes all responsibility for any damage or...

Explanation of how an E-tune works