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eFlexFuel ethanol conversion kits
eFlexFuel ethanol conversion kits
Boost Performance with the eFlexPlus E85 Flex Fuel Conversion Kit
Install eFlexPlus, fill up with E85, and drive — it’s that simple. Unlocking the performance benefits of E85 has never been easier or safer:
Run on E85, gasoline, or any blend — automatically
Fully automatic operation: no tuning, map switching, or manual adjustments required
Choose Eco, Dynamic, or Sport driving modes, adjust cold-start fueling, monitor ethanol content and injector duty cycle — all via your smartphone with the eFlexApp
Clean “under-the-hood” installation that doesn’t interfere with your factory ECU, OBD system, or trigger a check engine light
Vehicle-specific E85 compatibility verification — including injectors, fuel pump, fuel lines, and any modifications
Includes everything needed for E85 conversion and DIY installation
Gain more power, lower engine temperatures, and reduce emissions with E85
The eFlexPlus kit automatically adjusts fueling based on the ethanol blend in your tank, helping eliminate knock and optimize engine performance. It’s the easiest way to convert your vehicle into a true flex-fuel setup—capable of running E85 or gasoline. For those seeking advanced tuning capabilities, we recommend exploring our eFlexPro kit.
Install eFlexPro 2, Run E85 & Gain 10–20% More HP/TQ
Install the eFlexPro 2, fill up with E85, and unleash more horsepower and torque. You’ll experience impressive gains using the default driving modes, and for those who want to go further, eFlexPro 2 offers safe, DIY tuning options to fully optimize ethanol performance for your specific setup.
eFlexPro includes all eFlexPlus features, plus exclusive Pro-only capabilities:
Enhanced fuel control for precise ethanol fueling
Upgraded Control Unit hardware for improved performance
Advanced wiring harness with two optional 0–5V analog inputs
Patent-pending Virtual Load Sensor—no need to tap into external load sensors
Wideband sensor integration for datalogging and creating E85-specific fuel maps
Detailed ethanol AFR tuning via our eFlexTuner Windows software
You don’t have to be a tuning expert to get more out of your vehicle while driving on E85. The eFlexPlus E85 flex fuel kit gives you the power you’re after and the ability to change engine performance settings on the fly.
Get greener kilometers as you cut down on your carbon footprint up to 80%.
Fully automatic and service free system: Drive on ethanol, gasoline or any combination of the two
Use eFlexApp and monitor your engine with your smartphone
Drive on a domestically produced renewable fuel that is often more economical choice than gasoline.
Ensured compatibility: eFlexFuel crew verifies the compatibility of your fuel system: fuel injectors, fuel pump, fuel lines etc.
Everything needed to run E0-E90 blend & DIY install is included
The eFlexPlus Direct E85 flex fuel kit automatically adjusts and optimizes fueling based on the E85 mix in your tank, eliminating knock and maximizing engine performance in the process. eFlexPlus Direct is the easiest way to convert your vehicle to a true flex fuel, E85-or-Gasoline capable vehicle.
NOTE: Additional aftermarket modifications may inhibit proper operation. Due to fuel system complexity, the eFlexPlus Sensor is ONLY compatible with unmodified / stock engines for the application. If you have questions about compatibility, please contact our Customer Support: support.eflexfuel.com.
eFlexPlus Sensor
Install eFlexPlus Sensor, fill up with E85, and Drive – that’s it! It has never been easier (or safer) to harness the performance of E85:
Drive on E85, Gasoline, or any blend of the two
Fully Automatic: No tuning, changing maps, or adjustments required
Monitor Ethanol content and Duty Cycle, and more via smartphone with our eFlexApp
“Under-the-hood” installation that doesn’t touch your factory ECU, OBD, or trigger a Check Engine Light
We verify your vehicle’s E85 compatibility, including fuel injectors, fuel pump, fuel lines, and any modifications done
Everything needed to run E85 & DIY install is included
Run high octane fuel, lower operating temperatures, and reduce emissions on E85!
The eFlexPlus Sensor E85 flex fuel kit automatically adjusts and optimizes fueling based on the E85 mix in your tank, eliminating knock and maximizing engine performance in the process. eFlexPlus Sensor is the easiest way to convert your vehicle to a true flex fuel, E85-or-Gasoline capable vehicle.
NOTE: Additional aftermarket modifications may inhibit proper operation. Due to fuel system complexity, the eFlexPlus Sensor is ONLY compatible with unmodified / stock engines for the application. If you have questions about compatibility, please contact our Customer Support: support.eflexfuel.com.
eFlexV10+ for over 8-cylinder vehicles
Install eFlexV10+, fill up with E85, and Drive – that’s it! It has never been easier (or safer) to harness the performance of E85:
Drive on E85, Gasoline, or any blend of the two
Fully Automatic: No tuning, changing maps, or adjustments required
“Under-the-hood” installation that doesn’t touch your factory ECU, OBD, or trigger a Check Engine Light
We verify your vehicle’s E85 compatibility, including fuel injectors, fuel pump, fuel lines, and any modifications done
Everything needed to run E85 & DIY install is included
Make more power, lower operating temperatures, and reduce emissions on E85!
Please note that the eFlexV10+ has limited eFlexApp features: it is not possible to use the control features (driving modes, cold start control). Bluetooth connection is only possible to one controller at a time.
eFlexV10+ includes 2 controllers, 2 wiring harnesses (max. 16-cyl), and one ethanol sensor with accessories.
eFlexV10+ shipping time is 7-10 workdays from order.
+Have an aftermarket wideband?
If YES, we highly recommend the eFlexPro system. You can connect your aftermarket wideband sensor directly to the eFlexPro harness, enabling precise ethanol AFR tuning using our free eFlexTuner software for Windows. Select the eFlexPro option from the dropdown to learn more.
+Vehicles with larger injectors or big power-adders
Vehicles equipped with upgraded fuel injectors or high-performance modifications—such as aftermarket forced induction systems, aggressive camshafts, or other major power adders—are strongly recommended to use our eFlexPro kit. It offers advanced fueling control and fine-tuning capabilities tailored for demanding builds.
This vehicle needs a custom wiring harness. Your kit will be shipped within five business days.
Free world wide shipping in 2-5 days
5 year warranty with registration
Lifetime customer support
Installation
Plug&Play installation - An experienced mechanic will install in 1h-2h. For first time DIY installation, expect to double the time needed.
Vehicle specs
Make & Model
Year
Engine
Power
Always Optimized Fully Automatic Flex Fuel
Cooler & Cleaner Engine
Up to 10% Increase in Performance
Complete System, No Tuning Needed
Complete System, No Tuning Needed
Up to 10% Increase in Performance
Your Fuel System Verified
DIY Virtual Load Sensor Tuning
Easily & safely create custom ethanol fuel maps based on your own vehicle's performance & modifications, without tapping into external load sensors - all from your laptop. Now you can augment your Ethanol fueling yourself, without touching your factory ECU and without jeopardizing engine safety.
Supercar Technology in your Daily Driver (or Weekend Warrior)
By installing the eFlexFuel kit, you're in good company. eFlexFuel conversion kits utilize technology found in the Koenigsegg Jesko, Dodge Challenger SRT Demon 170, and other top-tier performance vehicles. This tech is used to get the most out of ethanol, gasoline, or whatever blend of the two you have in your tank.
Experience the VelvetTouch+
VelvetTouch+ is the first-class signal processing technology developed by eFlexFuel. This technology ensures that the eFlexFuel system works in any engine, environment and conditions without interfering in any way with the operation of the vehicle. It also ensures that there is no signal interference that could disrupt vehicle systems. VelvetTouch+ allows you to convert your vehicle to ethanol in complete safety. Whether you drive on ethanol or gasoline.
Expertly Engineered, Designed & Manufactured in Finland
Expertly Engineered, Designed & Manufactured in Finland. We have developed our hardware & software in-house in Pirkkala, Finland, since day one. Before shipping, we confirm every single control unit's functionality before shipping.
Technical Specs & Features
Precise Ethanol Content real-time measured over 100 times per second
Advanced signal processing filtering system in all input signals
Shock-Proof & Weather Proof casing IP68
High Quality Wiring Harness with snap in connectors
Please confirm device versions features at eFlexApp page
eFlexTuner Main Features
3D Fuel Maps
With eFlexFuel's Pro models, fuel maps can be observed in the 3D graphics window. The view can be rotated freely and selected fuel map cells are highlighted over the 3D map. The color-coded fuel map makes analysis simple.
Data Logging
All running parameters of the control unit can be captured and saved to a log file. Choose which parameters to display including date range. eFlexPro and eFlexMoto Pro log files can be analyzed in-depth with the eFlexTuner. Color-coding helps distinguish data points. (For example, the fuel mixture or the injector duty cycle.)
Log File Analysis
eFlexPro and eFlexMoto Pro log files can be analyzed in depth with the eFlexTuner. Data can be taken from an entire session or a specific timespan. The data is color-coded, which helps to distinguish e.g., the fuel mixture or the injector duty cycle.
Please confirm device versions features at eFlexTuner page
eFlexFuel + E85 Vs. Gas Dyno Results
MOPAR (Chrysler, Dodge, Jeep, Ram)
Nissan / Infiniti
Honda / Acura
Honda Civic
Acura
Chevrolet / GMC / Cadillac
Subaru
Toyota
Toyota Tundra
Toyota Sienna
Mercedes-Benz
BMW S1000RR (moto)
Peak power gains do not always tell the whole story! It's important to look at power gains across the entire RPM range / dyno curve, A.K.A. power "under the curve." Power gains under the curve will have a greater impact on driving experience. This is because gains under the curve impact the broader usable powerband, whereas peak power is momentary - only at one point in the RPM range.
If peak gains are 5% while max gains under the curve show 20%, this +20% increase is a better reflection of how your driving experience will change (you'll certainly feel that increase!). You want to feel the difference in the seat of your pants, and this is where power under the curve plays usually the biggest role.
+Compare products
Features
VelvetTouch+ 1
Free 5-Year Warranty (with registration)
Ethanol Content real-time measured over 100 times per second
Cold enrichment custom setting (created with eFlexTuner) 2 3 4
Save RPM based enrichment with driving mode selection (created with eFlexTuner) 2 3 4
1
3
eFlexPro view for analog data
eFlexTuner
RPM based 2D fuel map 3 4
Fault codes 3
Cold start adjustment 3 4
Data logging 3
OBD2 connectibity 5 6
Autotuner 2 3 4 6
3D fuel map
2D map for external sensor
Log analyzer (4D scatter plot)
Sensor editor for user-defined sensors
Presets for most common AFR gauges
Virtual Load Sensor Tuning (eFlexPro 2)
1 VelvetTouch+ is the first-class signal processing technology developed by eFlexFuel. This technology ensures that the eFlexFuel system works in any engine, environment and conditions without interfering in any way with the operation of the vehicle. It also ensures that there is no signal interference that could disrupt vehicle systems. VelvetTouch+ allows you to convert your vehicle to E85 in complete safety. Whether you drive on ethanol or gasoline.
2 Does not include in eFlexPlus Direct.
3 Does not include in eFlexV10+.
4 Does not include in eFlexPlus Sensor.
5 Supports most Bluetooth OBD2 adapters (ELM327-protocol), for example OBDLink LX / MX+.
6 Requires Bluetooth OBD2 adapter for closed loop tuning and Wideband AFR gauge for open loop.
+What's included
Control unit (133 x 72 x 25 mm) x 2
Ethanol sensor
Wiring harness specific to your vehicle with an external temperature sensor x 2
T>Two additional analog inputs that plug in to the engine's own sensors (MAP, MAF, TPS or WBO) - included only in eFlexPro
General Installation and User Guide is included in the product package.
What's included in the E85 kit / Installation
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