2015-2017 Subaru WRX STi 2.5L E85 Flex Fuel Conversion Kits
Boost your HP by up to 20% With our Plug-and-Play E85 Kits
In 2015, Subaru decided to focus their Rally Car efforts on the WRX STi sedan and we are here for it. The 4th and current generation of WRX STi still gets its speed from the 2.5L turbocharged 4-cylinder, capable of 310 horsepower but its suspension got a major overhaul. Reminiscent of the 2000-2007 Impreza WRX STi, the current generation has a much tighter turn with quicker steering and super sharp reflexes for sailing through the curves. Boost the horsepower by up to 20% with one of our WRX STi E85 flex fuel conversion kits and you have a real track contender.
No tuning required!$699 List price $874 SKU: U-EF-PLUS
- Free shipping
- Delivery time 2-5 days
- 5 year warranty with registration
The eFlexPlus and the eFlexPro are so easy to install that you can do it yourself in an afternoon and have your car running any mixture of E85 flex-fuel and standard gasoline the same day. Both come with a handy phone app that allows you to monitor the fuel mixture and switch between efficiency and performance profiles, effortlessly. The eFlexPro comes with the additional eFlexTuning software that allows you to tune your turbocharged engine on any mixture of fuel above E50. Order one of these for your 4th generation Subaru WRX STi today and increase your horsepower by up to 20%. Your HP can go from 301 to 370 ponies. That’s not bad for a couple of hours of “work”.
Plug&Play installation with some modifications - An experienced mechanic will install in 2-3h. For first time DIY installation, expect to double the time needed.
|Make & Model||Subaru WRX|
|Engine||2.5l / EJ257|
|Dynamically adjust engine tune to match fuel|
|Available performance and eco tunes|
|Select performance or eco tunes via eFlexApp|
|Create and save custom dyno tunes|
|Pro grade eFlexTuner tuning software|
+ What's included
- Control unit (3” x 5 1/5” x 1” in)
- Ethanol sensor
- Wiring harness specific to your vehicle with an external temperature sensor (for 1-8 cylinders)
- Two additional analog inputs that plug in to the engine’s own sensors (MAP, MAF, TPS or WBO) - included only in eFlexPro
- Cable ties
- Male fuel injector connectors
- Fuel hose
- Fuel line quick connectors
- Fuel line disconnect tool
- Hose clamps
All eFlexFuel E85 kits operate via a wireless Bluetooth connection. This allows the eFlexApp to recognize the version of your E85 kit and monitor your engine in real-time while driving on E85, gasoline, or a combination of the two. With eFlexPro you can choose from six driving modes - three presets and three customizable ones. The app also lets you choose, monitor, and customize.
|Monitor ethanol content, fuel temperature, ambient engine temperature, injector duty cycle and cold enrichment, etc.|
|Real-time logging feature (duty cycle, ethanol content, engine temperature)|
|Self diagnosis - Display fault codes|
|Adjust and monitor cold start|
|Choose your driving mode (Economy, Dynamic, Sport)|
|Display OEM engine sensor data: MAP, MAF, TPS, or WBO|
|Custom E85 tunes (Created with eFlexTuner)||1||3|
eFlexTuner is a free PC software that connects to eFlexFuel kits via Bluetooth. Create your own custom E85 tunes and switch them while driving from the eFlexApp.
- Fuel map adjustment
- Log file analysis
- 3D fuel maps
- Sensor linkage
- Cold start adjustment
- Fault codes
- Data logging
- Installation info
- Product package includes detailed manual
We always verify compatibility of the purchased product with the customer’s vehicle, so you don’t need to return or exchange your kit. If you must return or exchange your purchase, please contact us within 30 days of receiving your order. Your intent to return must be in writing, include a reason for return and sent to [email protected] Please include your reason for return/exchange.
The team at eFlexFuel will then issue a return authorization number (RMA) and shipping instructions. Please be advised – we are charging a $50 restocking fee. and be sure to buy insurance for the return shipment because we’re not responsible for returns that get lost or damaged in transit.More About Returns
eFlexFuel guarantees its products are free of manufacturing defect for 2 years of use.
If you wish to extend the limited liability warranty to 5 years, please register your product here.More About Warranty
What's included in the eFlexPro E85 flex fuel conversion kit / Installation
Note: If your car is modified you can use E85 with eFlexFuel. If this is the case, please list all the main engine modifications on the checkout page. Our technical team will ensure that your setup is fit for E85.
* Power and torque increase depends on your engine technology and/or your custom built of the engine.