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.
+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.
SKU: EFLEXPLUS Availability: In stock - Free world wide shipping in 2-5 days
- 5 year warranty with registration
- Lifetime customer support
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 (no soldering required)
- Ethanol Tested & Approved fuel accessories (line, clamps, quick-connectors)
- Bluetooth 5.2
eFlexApp Main Features
Dynamic Gauge Screen
with Key Information
Choose Your Driving Mode
Dyno Proven Power Gain
Real-time Analog Data
for Sensor Inputs
Log History
with Real-Time Parameters
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
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+ * | ||
| Free 5-Year Warranty (with registration) | ||
| Ethanol Content real-time measured over 100 times per second | ||
| Shock-Proof & Weather Proof casing | ||
| Ethanol Tested & Approved fuel accessories (line, clamps, quick-connectors) | ||
| Bluetooth | ||
| Analog Wires for External Sensors | ||
| eFlexApp | ||
| Ethanol content | ||
| Vehicle speed | ||
| Engine RPM | ||
| Fuel injector duty cycle | ||
| Fuel temperature | ||
| Ambient engine temperature | ||
| Fuel injector activity | ||
| Cold enrichment | ||
| Device status | ||
| Driving mode selection * | ||
| Cold enrichment custom setting (created with eFlexTuner) ** | ||
| Save RPM based enrichment with driving mode selection (created with eFlexTuner) ** | 1 | 3 |
| eFlexPro view for analog data | ||
| eFlexTuner | ||
| RPM. based 2D fuel map ** | ||
| Fault codes | ||
| Data logging | ||
| Cold start adjustment ** | ||
| Log file analysis | ||
| Sensor linkage | ||
| Virtual Load Sensor Tuning (eFlexPro 2) |
* 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.
** Does not include in eFlexV10+ or eFlexPlus Direct devices.