REFInd was nicely installed in /EFI/refind/ on the UEFI partition (sdX1, mounted on /boot/temp-efi, so in my case in /boot/temp-efi/EFI. Piggy Back Controllers connect into the OEM wiring harness to make changes to the fuel map. These devices alter the sensor signal from your engine and “fooling” your factory ECU into providing a different amount of fuel than the real engine conditions warrant. The simplest example of this is that if the factory ECU is told the engine temperature is 30 degrees cooler than it really is, the ECU is going to lengthen the time the fuel injectors are open and provide a richer fuel mixture. It’s actually a simple, but effective way to create new fuel maps. You create an adjusted fuel map in the piggy back system software and it is smart enough to change what the factory ECU senses. The downside of this upgrade is that you never really change the true fuel map that is in the factory ECU.
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