BMW S55 M2 M3 M4 Bluetooth Flex Fuel Kits for F Chassis

Stop Guessing. Start Knowing Your Exact Ethanol Content.

Running E85 on your S55 BMW M2, M3, or M4? Ethanol content at the E85 pump can vary from E50 to E85 or higher depending on season and station. Regular premium gas can have up to 10% ethanol at some stations. No more calculating gallons at the pump and guessing ethanol percentage. Just open the app and know.

Key Features

Real-time ethanol content monitoring via Bluetooth
Displays exact ethanol percentage (E-content) in the Fuel-It! or JB4 app
05V analog output for JB4 or flash tuning integration
Genuine Continental ethanol sensor for OEM-grade accuracy
Plug and play fuel line integration
Ethanol safe PTFE fuel lines and fittings
Installs in approximately 30 minutes
No cutting or permanent modification required

Why You Need an Ethanol Sensor

E85 pumps rarely dispense true E85. Seasonal blends can drop into the E50 range without notice. If youre tuning for ethanol, this matters.

With this kit you can

Dial in your exact E85 blend every fill-up
Avoid running too much ethanol on a pump gas map
Maximize timing and boost safely on ethanol maps
Maintain consistent performance at the track
Protect your engine from unknown fuel mixtures

The Bottom Line

If youre running E85 in your S55 powered M, a flex fuel sensor isnt optional, its essential.

Power, consistency, and safety all start with knowing exactly whats in your tank.

S55 BMW Vehicle Fitment

Compatible with the BMW S55 3.0L twin-turbo engine only.

BMW M2
2019-2021 S55 F87 BMW M2, including M2 Competition and 2020 M2 CS models

BMW M3
2015-2018 S55 F80 BMW M3, including Competition, 30 Jahre, and CS models

BMW M4
2015-2020 S55 F82/F83 BMW M4 Coupe and Convertible, including Competition
2016 S55 F82 BMW M4 GTS
2018-2019 S55 F82 BMW M4 CS

Download the Fuel-It! ECA app here:

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