The future of ethanol afr tuning is eFlexTuner
Professional tuners and DIY enthusiasts rejoice, your answer to ethanol AFR tuning has arrived: meet eFlexTuner.
eFlexTuner empowers you to optimize ethanol fueling and get the most out of E85 from your eFlexFuel system, without touching the vehicle’s ECU. Make unlimited ethanol fueling corrections tailored to your vehicle in real-time or based on eFlexTuner data logs. Save your customized ethanol AFR tunes to your eFlexFuel device via Bluetooth and access them any time on your smartphone with the free eFlexApp.
Your engine demands precision ethanol fueling to deliver maximum performance: tailor ethanol AFRs with our patented eFlexTuner and get the most from your eFlexFuel system.
eFlexTuner Overview
Create unlimited custom ethanol AFR tunes
Beginner friendly with robust features for tuning professionals
Monitor, log, and analyze up to 21 critical engine & fueling datapoints
Ethanol AFR tuning applied directly to your eFlexFuel device only and fully reversible
Non-invasive: tune ethanol AFRs without touching or reprogramming your vehicle’s ECU
eFlexTuner Price: 100% Free
How does eFlexTuner work without touching my vehicle’s ECU?
eFlexTuner empowers you to make ethanol fueling corrections and control ethanol AFRs independent of the vehicle’s ECU. Any fueling adjustments made in eFlexTuner will only be applied to your eFlexFuel device, without interacting with the vehicle’s ECU or ODBII system. Because of this, eFlexTuner adjustments are completely untraceable and will not impact vital factory ECU operations and safety functions.
All corrections made via eFlexTuner will ONLY impact your ethanol fueling. The higher the ethanol percentage of your fuel, the greater the impact these adjustments will have – this is an ethanol AFR tuning tool, it will not affect your gasoline fueling. If you are running gasoline, there will be zero impact from eFlexTuner adjustments. We recommend performing eFlexTuner ethanol AFR tuning with as high an ethanol percentage as possible for best results.
+ Closed Loop eFlexTuner Capabilities (eFlexPro Only)
Closed loop operation typically occurs during partial throttle input and light load; basically, during normal driving conditions. In closed loop, the vehicle’s ECU constantly adjusts fuel delivery based on feedback from oxygen sensors in the exhaust system. Because the vehicle’s ECU is constantly correcting fuel trims, customized eFlexTuner adjustments during closed loop will have a limited effect - but are still possible!
The goal of closed loop ethanol AFR tuning with eFlexTuner is to minimize or eliminate your ECU’s fuel trim adjustments, allowing your vehicle to operate with maximum efficiency in closed loop operation. By completing closed loop tuning, you are ensuring your engine is performing with optimal fuel efficiency and power delivery during normal driving conditions.
Closed loop eFlexTuner adjustments are performed by monitoring OBD fuel trims on an OBDII reader or datalogging OBD fuel trims via eFlexTuner1 and making adjustments to your eFlexTuner fuel map in the appropriate load/RPM fields. eFlexPro is required to perform closed loop tuning.
1) Compatible Bluetooth OBDII dongle required
+ Open Loop eFlexTuner Capabilities
Open loop operation occurs during wide-open throttle (WOT), high RPM, and heavy load conditions. In open loop, the vehicle’s ECU relies on predetermined fuel maps based on varying conditions, such as load and RPM. Because the vehicle’s fueling is derived from lookup tables, customized eFlexTuner adjustments deliver reliable and consistent AFR changes during open loop, allowing you to dial in your desired ethanol AFR/Lambda values and maximize performance.
The goal of open loop ethanol AFR tuning with eFlexTuner is to deliver precise ethanol fueling that matches your specific vehicle, engine, and build to optimize performance and generate maximum horsepower, torque and responsiveness. While our “out-of-the-box” ethanol fueling performs great, ethanol AFR tuning tailored to your vehicle yields maximum performance, whether your engine is stock or fully built.
Open loop eFlexTuner adjustments are performed by reviewing AFR/Lambda values during a dyno run or datalogging AFR/Lambda values via eFlexTuner1 and making adjustments to your eFlexTuner fuel map in the appropriate load/RPM cells. eFlexTuner includes a log analyzer that enables you to pinpoint specific load/RPM cells that require adjustment and modify fueling in a matter of clicks. eFlexPro is required to data log AFR/Lambda values.
1) Compatible aftermarket wideband sensor required
By performing open loop ethanol AFR tuning via eFlexTuner, you are maximizing the horsepower, torque, and responsiveness potential of E85 from your eFlexFuel system!
+ Injector Dead Time & Offset eFlexTuner Capabilities
If needed, eFlexTuner allows you to match your ethanol fueling dead time to the dead time / offset requirements of larger injectors. This ensures you have smooth operation and ideal fueling characteristics during idle and very low-load operation while running high ethanol blends, even with larger injectors installed!
Note: When installing larger injectors you still must perform a gasoline ECU tune. eFlexTuner can only be used to fine-tune your ethanol fueling, it cannot be used to change baseline gasoline fueling to compensate for larger injectors. eFlexPro is recommended for large injector applications.
eFlexTuner Highlights
3D Fuel Maps
View 3D fuel maps when tuning or reviewing your eFlexPro fuel table. This view can be rotated freely with selected fuel cells appearing highlighted on the 3D map. This color-coded map makes the data easier to digest, simplifying analysis and correction.
Data Logging
View and log up to 21 critical parameters from your eFlexFuel control unit, compatible Bluetooth OBD dongle, and compatible analog input signals (wideband, MAF, MAP, TPS, fuel pressure, etc.) to make data-driven fueling corrections. Data channels include Load, RPM, Injector Duty Cycle, Ethanol Content, OBD fuel trim values1, Lambda/AFR values2, and more! See full list in detailed features below.
1) Requires compatible Bluetooth OBDII dongle, 2) Requires compatible wideband sensor
Log File Analysis
Analyze eFlexPro data log files and review color-coded datapoints to highlight lean or rich areas in your fueling. Log analysis is displayed next to the active fuel map, making fueling corrections quick and painless. Update your fuel map, record a new log, and repeat analysis with updates until satisfied – it’s that easy!
Detailed Features
+ eFlexPlus & eFlexMoto Plus
eFlexTuner offers limited support for the eFlexPlus device family:
- Non-Invasive Tuning: All fueling adjustments made via eFlexTuner only impact your eFlexFuel device, allowing you to make customized fueling corrections without reprogramming your vehicle’s ECU.
- Fuel Map Adjustments (LIMITED): Make RPM-only based fuel map adjustments for non-specific ethanol fueling corrections. eFlexPro is required for precise Load x RPM adjustments.
- Data Logging (LIMITED): View and log up to 17 critical parameters from your eFlexFuel control unit and compatible Bluetooth OBD dongle to make data-driven fueling corrections. Native eFlexPlus data channels include RPM, Injector Duty Cycle, Fuel Ethanol Content, Fuel Temperature, Engine Temperature, Fuel Map Value, Ethanol Content Compensation, Startup Correction, and nine OBDII related data channels. See OBD Data Logging below for more.
- OBD Data Logging (Beta): OBD data log channels include Lambda State 1, Lambda State 2, Engine Load, STFT 1, STFT 2, LTFT 1, LTFT 2, Fuel Trim 1 Sum, and Fuel Trim 2 Sum. Please note a compatible Bluetooth OBDII dongle is required for OBD data logging. OBD data logging is still in beta phase and may require patience when connecting.
- Fault codes: eFlexFuel products have built-in self-diagnostics. With eFlexTuner, you can read the fault codes to help troubleshooting efforts.
- Cold Start Adjustment: With versatile cold start adjustment factors, define your settings in three phases of start-up, from cranking to warm-up, and monitor the cold start process in real-time.
- eFlexFuel Device Lock: Lock your eFlexFuel device to prevent any changes and ensure full fueling security.
- Injector Dead Time & Offset Correction (LIMITED): We strongly recommend vehicles running larger injectors choose our eFlexPro device for improved complex ethanol fueling control. That said, eFlexPlus also supports injector dead time and offset correction. Adjust and match your ethanol fueling dead time to the dead time / offset requirements of larger injectors. With eFlexPlus, this promotes smoother operation and fueling characteristics during idle and very low-load operation while running high ethanol blends with larger injectors installed.
- A Note on Larger Injectors: When installing larger injectors you must still perform a gasoline ECU tune outside of eFlexTuner. eFlexTuner can ONLY be used to fine-tune your ethanol fueling, it cannot be used to change baseline gasoline fueling to compensate for larger injectors.
+ eFlexPro & eFlexMoto Pro
All eFlexTuner features are compatible with the eFlexPro device family:
- Non-Invasive Tuning: All fueling adjustments made via eFlexTuner only impact your eFlexFuel device, allowing you to make customized fueling corrections without reprogramming your vehicle’s ECU.
- Virtual Load Sensor Tuning: Easily create custom ethanol fuel maps based on your own vehicle's performance & modifications, without tapping into external load sensors - all from your laptop. Augment your Ethanol fueling without touching your factory ECU.
- Fuel Map Adjustments: Make Load x RPM fuel map corrections to precisely adjust ethanol fueling for all different load and RPM situations. The appropriate fuel map cell will be highlighted in real-time to simplify the adjustment process – tune in real-time or make adjustments based on log files.
- 3D Fuel Maps: View 3D fuel maps when tuning or reviewing your eFlexPro fuel table. This view can be rotated freely with selected fuel cells appearing highlighted on the 3D map. This color-coded map makes the data easier to digest, simplifying analysis and correction.
- Data Logging: View and log up to 21 critical parameters from your eFlexFuel control unit, compatible Bluetooth OBD dongle, and compatible analog input signals (AFR/Lambda from wideband, fuel pressure, MAF, MAP, TPS, etc.) to make data-driven fueling corrections. Native eFlexPro data channels include Load (ECU Pulse In), RPM, Injector Duty Cycle, Fuel Ethanol Content, Fuel Temperature, Engine Temperature, Fuel Map Value, Fuel Map 2 Value, Ethanol Content Compensation, Startup Correction, Analog Input 1, Analog Input 2, and nine OBDII related data channels. See External Sensor Data Logging and OBD Data Logging below for more.
- External Sensor Data Logging: Log from either or both optional 0-5V analog inputs. A compatible aftermarket wideband is most commonly used to log AFR/Lambda values from one of these inputs to aid in ethanol AFR tuning. Your Throttle Position Sensor, MAF sensor, MAP sensor, compatible fuel pressure sensor, or other 0-5V signal can also be used if this would be helpful for your tuning.
- OBD Data Logging (Beta): OBD data log channels include Lambda State 1, Lambda State 2, Engine Load, STFT 1, STFT 2, LTFT 1, LTFT 2, Fuel Trim 1 Sum, and Fuel Trim 2 Sum. Please note a compatible Bluetooth OBDII dongle is required for OBD data logging. OBD data logging is still in beta phase and may require patience when connecting.
- Log File Analysis: Analyze eFlexPro data log files and review color-coded datapoints to highlight lean or rich areas in your fueling. Log analysis is displayed next to the active fuel map, making fueling corrections quick and painless. Update your fuel map, record a new log, and repeat analysis with updates until satisfied – it’s that easy!
- Cold Start Adjustment: With versatile cold start adjustment factors, define your settings in three phases of start-up, from cranking to warm-up. Monitor the cold start process in real-time.
- Fault codes: eFlexFuel products have built-in self-diagnostics. With eFlexTuner, you can read the fault codes and troubleshooting efforts.
- eFlexFuel Device Lock: Lock your eFlexFuel device to prevent any changes and ensure full fueling security.
- Injector Dead Time & Offset Correction: Adjust and match your ethanol fueling dead time to the dead time / offset requirements of larger injectors. This ensures you have smooth operation and ideal fueling characteristics during idle and very low-load operation while running high ethanol blends, even with larger injectors installed!
- A Note on Larger Injectors: When installing larger injectors you must still perform a gasoline ECU tune outside of eFlexTuner. eFlexTuner can ONLY be used to fine-tune your ethanol fueling, it cannot be used to change baseline gasoline fueling to compensate for larger injectors.
- Supported Wideband Sensors: If your wideband sensor has a 0-5V Analog Output (most do), then it is likely compatible with eFlexTuner. We have pre-loaded some popular wideband sensor files, but this is not all inclusive. Don’t see your sensor listed? If it has a 0-5V Analog Output then it is most likely compatible, please contact us for confirmation.
Pre-loaded wideband sensors include:
- 14point1 SLC Free 2 and Spartan 2 AFR (Gas)
- 14point1 SLC Free 2 and Spartan 2 Lambda
- AEM 30-4110 UEGO Gauge AFR (Gas)
- AEM 30-4110 UEGO Gauge Lambda
- AEM X-Series UEGO Gauge AFR (Gas)
- AEM X-Series UEGO Gauge Lambda
- Ballenger Motorsports AFR500 AFR (Gas)
- Ballenger Motorsports AFR500 Lambda
- Ballenger Motorsports AFR500v2 extreme range AFR (Gas)
- Ballenger Motorsports AFR500v2 std range AFR (Gas)
- Ballenger Motorsports AFR500v2 extreme range Lambda
- Ballenger Motorsports AFR500v2 std range Lambda
- Innovate LC-2 AFR (Gas)
- Innovate LC-2 Lambda
- Innovate MTX-L PLUS AFR (Gas)
- Innovate MTX-L PLUS Lambda
- NGK Powerdex AFX Wideband AFR (Gas)
- NGK Powerdex AFX Wideband Lambda
- PLX SM-AFR AFR (Gas)
- PLX SM-AFR Lambda
- Zeitronix ZT-2 Wideband AFR (Gas)
- Zeitronix ZT-2 Wideband Lambda
- Zeitronix ZT-3 Wideband AFR (Gas)
- Zeitronix ZT-3 Wideband Lambda
- Don’t see your wideband listed? Don’t worry, contact us to confirm compatibility!
About eFlexTuner
The eFlexFuel R&D team developed both the eFlexApp and our eFlexTuner E85 tuning software in-house to meet the specific requirements of our E85 kits. While all eFlexFuel kits come with fully automatic, real-time ethanol content sensor with automatic fueling corrections, the eFlexTuner allows eFlexPlus and eFlexPro users to modify their fueling to achieve maximum engine performance.
eFlexTuner Technical Requirements: Windows 10/11 OS, Bluetooth 4.0+ support. Most laptops have BT 4.0+ but a USB Bluetooth dongle can be used if the computer does not have BT.
eFlexTuner User ManualGet your free e85 tuning software
Download DropBox (alt.)eFlexTuner FAQ:
+ Is eFlexTuner really free?
YES! eFlexTuner is 100% free to download and use for an unlimited number of sessions and vehicles.
+ Why/How is eFlexTuner Free?
We appreciate our customers and understand that purchasing an eFlexFuel kit means you want the best in E85 fueling capabilities. We consider eFlexTuner an extension of our kits, empowering eFlexFuel customers to achieve optimal E85 fueling.
+ Does eFlexTuner require licenses?
No, eFlexTuner does not require licenses. It is 100% free to use for an unlimited number of sessions and vehicles.
+ Can anyone use eFlexTuner?
Anyone can use eFlexTuner! We recommend having some basic tuning principles knowledge, but we’ve designed this software to be intuitive and user friendly. Because the system doesn’t touch your factory ECU, those safety nets will also remain in place. Watch some quality YouTube videos on AFR tuning, read our instructions in full, and try making small adjustments to your ethanol fueling! However, perform all tuning at your own risk – eFlexFuel cannot be held liable for improper use.
+ What supporting hardware do I need in order to get the most out of eFlexTuner?
To get the most out of eFlexTuner, we recommend our eFlexPro E85 kit and a compatible aftermarket wideband sensor. The AEM X-Series gauge is probably the most popular wideband used by our customers and we have created an installation article that can be found here. With this combination properly installed, you will not need access to a dyno and can DIY tune after data logging or email us for tuning support.
+ Can eFlexTuner control timing?
No, eFlexTuner cannot control timing. eFlexTuner only controls ethanol AFR fueling via your eFlexFuel control unit and DOES NOT control timing. However, by dialing in your ethanol fueling, you are ensuring optimal horsepower, torque, and responsiveness for your engine’s configuration and current ECU tune parameters. When running E85, knock will be virtually zero, preventing your ECU’s need to retard ignition (pull timing) and when combined with optimal AFR/Lambda, performance is maximized.
