BMW 535i & Z4 Bluetooth Flex Fuel Kits for the E Chassis N54 Motors

Stop Guessing. Start Knowing Your Exact Ethanol Content.

Running E85 on your N54 powered BMW 535i or Z4? 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, a flex fuel sensor isnt optional, its essential.

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

Vehicle Fitment

BMW 5 Series
2008-2010 E60 BMW 535i Sedan including xDrive
2008-2010 E61 BMW 535i Touring including xDrive

BMW Z Series
2009-2016 E89 BMW Z4 sDrive35i and Z4 sDrive35is

Download the Fuel-It! ECA app here:

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