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

• An MHD or EcuTek tune with the FlexFuel option enabled. The kit supplies the ethanol reading; the tune does the work. Speed Logic stocks the matching MHD Super License for BMW B58, Toyota Supra B58 and 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 at the pump — the FlexFuel maps only make sense with ethanol available locally.
• Basic hand tools and a safe way to relieve fuel system pressure, supplied by the installer.

Installation

• Step-by-step guide to setup, flashing, datalogging and returning to stock: Speed Logic MHD Tuning Guide (it links to every section of MHD's own user guide)
• Installation instructions are supplied with the kit; contact Speed Logic if you need help.

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).
• The table lists the cars MHD and its US distributor Bimmer ECU Solutions name for this kit.
• 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