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eFlexFuel E85 flex fuel conversion kits

$699 List price $874

Starting at $61.50 / month with Affirm logo

Truspilot consumer rating 4.7 SKU: U-EF-PLUS Availability: In stock
  • Free shipping
  • Delivery time 2-5 days
  • 5 year warranty with registration
Fully Automatic Flex FuelAlways Optimized Fully Automatic Flex Fuel
Cooler & Cleaner EngineCooler & Cleaner Engine
No Tuning NeededComplete System, No Tuning Needed
Increase PerformanceUp to 10% Increase in Performance
Flex Fuel System VerifiedYour Fuel System Verified
Automatic engine tune adjustment in real-time to match the fuel blend
eFlexApp for smartphones
Ability to connect to two OEM or external engine sensors: MAF, MAP, TPS or WBO
eFlexTuner tuning software for Windows PC
Ability to create custom E85 tunes with fully adjustable 3D fuel maps

+ 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
  • Cable ties
  • Male fuel injector connectors
  • Fuel hose
  • Fuel line quick connectors
  • Fuel line disconnect tool
  • Hose clamps
  • Installation and User Guide

+ eFlexApp

All eFlexFuel kits feature a Bluetooth connection and eFlexApp for your smartphone. eFlexApp allows you to monitor your engine in real-time while driving on E85, gasoline, or a combination of the two. You can also toggle between three different engine performance modes: Economy, Sport, and Dynamic.

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)3

+ eFlexTuner

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

  • Installation info
  • General Installation and User Guide is included in the product package.

+ Returns

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

+ Warranty

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.

Prop 65 Warning
Warning signNot legal for sale or use on pollution-controlled vehicles