November 2025 Release!

Welcome to the FOME 2511 release!

Breaking Changes

• Closed loop boost control tables now have their own axes, rather than sharing with open loop. If using closed loop boost control, you will have to reconfigure the X/Y axes on the closed loop table.

Added

• Allow fractional tachometer pulse ratio for fine tachometer calibration
• Add an option to ramp the idle target down as engine speed returns to idle. Makes the running -> idle transition much smoother while in closed loop mode #570
• Lua functions storePersistentValue/getPersistentValue to persist values in backup memory between reboots #592
• Fully disable VVT when the target is 0. This prevents trying to control VVT when near the stop, which can damage the locking pin on some engines.
• Automatic cylinder balancing of MAP sensor readings for smoother running at high load #610
• Table-based injector small pulse compensation #609
• MAF filtering for better transient response
• Minimum injector pulse width setting
• Allow selection of DTC severity #625
• AC pressure switch & startup delay (#623, #660, #661, #662)
• Y axis override for VVT target
• Feature to skip initial trigger pulses for noisy triggers #634
• VVT open loop "hold" table #638
• Fire DTCs for detectable cam/crank errors
• Selectable X/Y axis channels for boost control #861
• Implement a trailing spark table (for rotary and dual-plug engines) #695

Fixed

• CAN reception on STM32H7-based ECUs
• Speed up bootloader launch by 250ms
• Move ETB sensor redundancy from Experimental/Broken/Parking Lot to sensor dialogs #165
• K20/K24 intake VVT angle reads correctly
• Easier to decipher check engine light blink codes #653
• TunerStudio: Provide sensible EGT sensor "high" alerting threshold defaults
• Improve knock detection dialog UX
• Increase memory available to Lua on STM32F4 and STM32F7-based ECUs

Removed

• Removed A/C-based alternator open-loop duty adder (#660)

New Contributors

• @rozap made their first contribution in #584
• @mikaelhirn made their first contribution in #618

Full Changelog: release_250220_04...release_251103_01