FlexFuel

MS41.3 supports FlexFuel with the associated supporting hardware. Here are some base values that can be used to get up and running quickly. Further tuning will be required.

Support Thread - https://www.romraider.com/forum/viewtopic.php?f=58&t=20199

The flowchart below describes the custom Assembler code that governs the FlexFuel logic within MS41.3. Further explanation will be posted later.

Full blending of alternate fuel and timing maps that respond to a variable 0 to 100% Alternate Fuel Content is supported. You can also configure them to respond to an on/off toggle switch if a 0-5V transducer is not available.

Common Alternate Fuels:

Ethanol Mix (E0 thru E100)

Liquified Petroluem Gas (LPG)

Hardware

FlexFuel can be utilized by installing an Ethanol Content sensor which has a final output of a linear 0-5 Volts.

GM and Continental make EC sensors but they output a square wave with varying frequencies and widths. These cannot be directly connected to the MS41 ECU. An Ethanol Content Analyzer converts these digital signals into a 0-5 Volt linear analog output which the ECU can read, for example:

https://www.hamotorsports.com/products/kt-flex-fuel-conv

https://www.fuel-it.com/bluetooth-flex-fuel-analyzer/

https://forums.nasioc.com/forums/showthread.php?t=2810122 (DIY)

Or, you can buy a full kit: