MHD FlexFuel Kit (Automatic) – BMW G-Series / Toyota GR Supra

OVERVIEW

The MHD FlexFuel Kit for BMW G Series and Toyota Supra models with an automatic transmission enables the FlexFuel feature on MHD and EcuTek tuned vehicles. It covers the B48, B58 and S58 engines.

A CAN Ethanol Content Analyzer (ECA) reads the signal from the E85 sensor, converts it to CAN format and sends it to the engine computer (DME). E85 is a fuel with a high octane rating; the FlexFuel feature is the tuning function that adjusts the tune on the fly to the ethanol content the ECA reports in the tank. Without the correct tune for the blend in the tank the engine will not run correctly and can be damaged.

Installation is straightforward with no wires to splice or solder. The kit is plug-and-play including connectors and fuel fittings, and every unit is tested before it ships.

SPECS

• Enables the FlexFuel feature on MHD and EcuTek tuned cars
• CAN Ethanol Content Analyzer: reads the E85 sensor and converts the signal to CAN for the DME
• Coverage: G Series BMW and Toyota GR Supra with automatic transmission, B48 / B58 Gen 1 and Gen 2 / S58 engines — see Vehicle Applications
• For the OEM / stock / TU high pressure fuel pump
• Plug-and-play installation — no wire splicing or soldering
• Includes the connectors and fuel fittings needed for the install
• Custom Precision Raceworks PR360 5/16 in. plug-and-play fuel fittings
• Every unit is bench tested before shipping

PARTS INCLUDED

• Ethanol Analyzer Module
• Ethanol Sensor
• Custom plug-and-play piggyback harness
• Custom plug-and-play Precision Raceworks PR360 5/16 in. fittings
• Eye protection glasses
• Hand protection gloves

TECH RESOURCES

Additional Parts Required

• Active MHD Flasher Super License with FlexFuel maps (or an EcuTek tune with FlexFuel enabled). The kit supplies the ethanol reading; the tune does the work. Matching MHD Super License: BMW B58, Toyota Supra B58, S58.
• MHD Universal WIFI Adapter or another supported MHD interface, needed to flash the FlexFuel-enabled map to the car.
• E85 or an ethanol blend available at the pump.

Installation

• MHD FlexFuel Kit – G20 B58 / G80 S58 install video
• MHD FlexFuel Kit – G-Series B58 / S58 (X3 M / X4 M) install video
• PR360 fuel fitting lock and check procedure (PDF): PR360 Fitting Lock Guide
• How to enable the FlexFuel feature in the MHD app (video)
• Setup, flashing, datalogging and return-to-stock: Speed Logic MHD Tuning Guide
• Request an Install Appointment

Notes

• Automatic transmission cars only. Manual-transmission cars need the MHD FlexFuel Kit (Open Wire).
• For the OEM / stock / TU high pressure fuel pump only.
• Requires an MHD or EcuTek tune with FlexFuel enabled.
• Not for B58 Gen 3 cars (2023+ 740i G70, 2024+ 540i G60, 2024+ X5 / X6, 2025+ M340i / M440i).
• For off-road use only.
• Not sure? Send us your VIN and we'll confirm fitment before you order.
• Part Number: MHD-ECA-G-B58-S58-AT

VEHICLE APPLICATIONS

Years are US model years. Confirm your exact model and build date with Speed Logic by VIN before ordering.