Description
Upgrade your fuel system and safely unlock the full performance potential of your BMW Gen 2 B58 engine with a complete Flex Fuel Kit. This plug-and-play system provides accurate ethanol content readings in real time through a digital LED display or your mobile device. Compatible with flash tuning platforms including MHD, BM3, EcuTek, and JB4, this kit is essential for anyone running ethanol blends or full E85.
Fast, Clean Installation in 30 Minutes
Each kit is engineered for a seamless, plug-and-play installation with no wire cutting or custom work required. Choose between CANbus or Bluetooth ECA modules based on your vehicle and tuning setup.
Available Kit Options
1. Complete Kit with CANbus ECA and Plug-and-Play Harness
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Compatible with automatic transmission G-chassis B58 models
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Supports JB4, MHD, BM3, and EcuTek
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Includes digital LED display and smartphone monitoring via the BMS CANflex app
2. Complete Kit with CANbus ECA and Universal Harness
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Designed for manual transmission models or BM3 flex fuel setups
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Offers all CANflex functionality with universal wiring
3. Complete Kit with Fuel-It! Bluetooth ECA
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Enables wireless ethanol content monitoring through the Fuel-It! app
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Includes Bluetooth and 5V analog output
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Ideal for JB4 and standalone Bluetooth setups
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Note: This version does not include CANbus integration
Included Components
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Genuine Continental ethanol content sensor
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BMS CANflex ECA or Fuel-It! Bluetooth ECA
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Stainless steel braided fuel lines with black nylon sheathing
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Custom billet fuel fitting with removable 1/8" NPT port for optional port injection
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Optional plug-and-play or universal wiring harness
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Free mobile app downloads for iOS and Android
Performance Benefits
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View ethanol content in real time via LED display or mobile device
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Supports optimized tuning for E30 to E85 blends
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Compatible with JB4, MHD, BM3, and EcuTek
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Prevents timing and fueling mismatches from fluctuating ethanol levels
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Designed specifically for Gen 2 B58 engines
Important Notes
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For JB4 installation, connect the white or blue wire to Pin #4 on the 25-pin harness
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Select WMI Ethanol Setup Option 0 in JB4 menu to activate flex fuel input
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Ethanol sensors measure fuel based on gasoline absence; fuel contamination may affect readings
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Kit must include fuel lines, ethanol sensor, and analyzer to function properly
Vehicle Fitment
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2022+ G42 BMW M240i
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2019–2024 G20/G21 BMW M340i
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2021–2024 G22/G23/G26 BMW M440i
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2017+ G30 BMW 540i
This flex fuel kit is the perfect solution for ensuring your BMW’s tuning strategy adapts accurately to any ethanol blend. Monitor your fuel content with precision and drive with confidence on every tank.
