Flex Fuel kit – Subaru WRX & STi 315600

Update 3/16/22: The Cobb Flex Fuel kit for WRX FA20 has been discontinued. If you need to add a flex fuel sensor input to your Subaru we have exactly what you need: VE Flex Fuel sensor kit + subaru TGV connector + 0-5v signal converter here. These are all the parts you will need to add flex fuel data to your OEM subaru ECU. The VE flex fuel kit also comes complete with -6an inlet/outlet fittings on the flex sensor for a clean race car spec install perfect for those running aftermarket fuel rails and fuel lines.

After years of development Cobb offers a full Flex Fuel solution for the Subaru WRX 08-14 and STI 08-2020. This means you can now safely run any blend of ethanol/gasoline and your ECU will know exactly how to handle the blended fuel. Cobb Flex Fuel kit 315600 is a bolt in solution that gives your ECU the exact ethanol content of your fuel which is a key part to a reliable Flex Fuel tune.

In the past we would normally use 2 different maps; 1 map for gasoline and 1 map for E85. While this works well it does not allow for any “blending” of the gasoline/Ethanol. Using the Flex Fuel kit you can now simply use 1 map for any gasoline/ethanol blend resulting in more HP and Torque along with un matched reliability, now that you can safely top off your fuel tank with whatever fuel is available you will never need to stress about which gas station you need to stop at again.

Special Tuning offer: All Cobb Flex fuel kit online orders get a $25 credit towards any of our Subaru E-tune services. Brewed Motorsports supports Cobb Flex Fuel through our normal Tuning service as well as our E-Tune services.

Why Do you need Flex Fuel or Ethanol?

Compared to standard pump fuel, the higher ethanol content in E85 provides a substantially higher effective octane rating. The octane rating of a fuel indicates its ability to resist detonation. This added resistance allows tuning to be more aggressive through timing and boost, yielding greater horsepower output. These factors combined make for a fuel solution with more power potential over the standard gasoline you find at the pump. With an active Flex Fuel system, a vehicle’s ECU is able to seamlessly blend calibrations required for each type of fuel. The COBB Flex Fuel kit will allow you to overcome any disparities in ethanol content from station to station or season to season. This is something a standard tune for E85 cannot do. Also, if there isn’t a station with E85 convenient, simply fill up with pump gas and avoid the need to change maps. We highly recommend using a Flex Fuel sensor on any race car (motorsports us ONLY) to ensure the ECU always knows the exact ethanol content of the fuel being used.

Easy installation, complete plug and play kit:

• Connects to your vehicle stock mounting point
• Pre fit fuel lines with OEM style quick connects
• Pre loomed wire harness for trouble free install
• For off road motorsports use only
• Easy-to-read color display of Ethanol content on AP v3

**With Cobb discontinuing their flex fuel kits we do have an alternative kit from Velocity Elements to take care of your needs!**

Emissions NOTE: The Cobb Flex Fuel kit is for off road Motorsports use only. This part is NOT CARB approved and can not be used on any public roads in the USA.