May 2026 Release Patch 1

Patch Notes

This is a minor patch over the May 2026 release. If you aren't having issues, there's no need to update.

Breaking Changes

• Upgrade console to use Java 21. This may require an update of your Java runtime.
• You may need to update your CAN wideband O2 sensor configuration to select the correct bus for each sensor (many ECUs, including Beer Money Motorsports, have the wideband controller(s) on CAN bus 2).

Added

• Dead knock sensor detection #578
• Allow sending CAN broadcast on both busses #712
• PWM fan control with configurable duty cycle #233
• AC state available as a GPPWM axis (e.g. for AC-dependent fan control) #233
• Lua getChannel function for safely reading ECU values #721
• Improved Atlas board support, including Polygonus engine presets #700
• Clearer ignition/injection pin naming in TunerStudio #596
• 1996-2006 Dodge Viper V10 crank trigger pattern

Fixed

• Prevent false ETB jam detection when the throttle is not being commanded (for example with "Disable ETB if engine is stopped" enabled), which could latch the throttle off permanently
• TPS/PPS raw voltage now readable even when calibration is invalid, allowing users to calibrate sensors #710
• Fix OpenBLT updating 1MB STM32F7-based ECUs
• Improve RPM rate of change signal to idle control so the D-term is actually usable
• Fix automatic knock frequency calculation when cylinder bore is not configured
• Correct ADC conversion precision #707
• Delay sensor error checking briefly after boot to avoid false errors
• Fix boost control blend table axis names in TunerStudio
• Default initialize output channels to avoid invalid values at startup
• Clean up CAN verbose DBC file, removing invalid/orphan entries #677
• Idle VE table when using an electronic throttle correctly uses accel pedal to match main idle logic

New Contributors

• @FDSoftware made their first contribution in #633
• @twisted-builds-llc made their first contribution in #751

Full Changelog: release_251103_01...release_260501_02

May 2026 Release!

Breaking Changes

• Upgrade console to use Java 21. This may require an update of your Java runtime.
• You may need to update your CAN wideband O2 sensor configuration to select the correct bus for each sensor (many ECUs, including Beer Money Motorsports, have the wideband controller(s) on CAN bus 2).

Added

• Dead knock sensor detection #578
• Allow sending CAN broadcast on both busses #712
• PWM fan control with configurable duty cycle #233
• AC state available as a GPPWM axis (e.g. for AC-dependent fan control) #233
• Lua getChannel function for safely reading ECU values #721
• Improved Atlas board support, including Polygonus engine presets #700
• Clearer ignition/injection pin naming in TunerStudio #596
• 1996-2006 Dodge Viper V10 crank trigger pattern

Fixed

• Prevent false ETB jam detection when the throttle is not being commanded (for example with "Disable ETB if engine is stopped" enabled), which could latch the throttle off permanently
• TPS/PPS raw voltage now readable even when calibration is invalid, allowing users to calibrate sensors #710
• Fix OpenBLT updating 1MB STM32F7-based ECUs
• Improve RPM rate of change signal to idle control so the D-term is actually usable
• Fix automatic knock frequency calculation when cylinder bore is not configured
• Correct ADC conversion precision #707
• Delay sensor error checking briefly after boot to avoid false errors
• Fix boost control blend table axis names in TunerStudio
• Default initialize output channels to avoid invalid values at startup
• Clean up CAN verbose DBC file, removing invalid/orphan entries #677
• Idle VE table when using an electronic throttle correctly uses accel pedal to match main idle logic

New Contributors

• @FDSoftware made their first contribution in #633
• @twisted-builds-llc made their first contribution in #751

Full Changelog: release_251103_01...release_260501_01

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

February 2025 Release!

Welcome to the FOME 2502 release!

Breaking Changes

• Large data logging improvements and changes - in TunerStudio, you may need to re-create your dash layouts from default and then re-add any broken gauges and indicators.

Added

• Read (some) OBD2 error codes using a normal scan tool! Currently limited to some common sensor errors. (#529 thank you @dynfer for implementation, @paleppp for testing, and others!)
• Support Miata NA CAS "CMP" signal as a cam input (if you've installed a 36-1 crank trigger on an NA, for example) #495
• Support 4 independent wideband O2 channels, and 4 fuel trim banks
• Flash error codes for some sensors using the check engine light #526
• Implement knock sensing support for STM32H7 chips
• Show knock sensing window on FOME console engine sniffer

Fixed

• Idle VE table's indicator dot properly tracks when using an idle VE Y-axis override
• Minor performance improvements to injection/ignition scheduling
• Per-cylinder knock sensing while in wasted spark mode (fixed by #553)
• Improved transitions between fuel/spark modes, improves cranking and startup (#551, #553. #554)

Full Changelog: release_240916_03...release_250220_01

September 2024 Release!

Welcome to the FOME 2409 release!

Added

• Staged injection: a second set of fuel injectors that inject part of the fuel load when you run out of primary injector
• VE/Ign/Boost blend tables can select a Y axis override for even more flexibility
• Added Lua function getAuxDigital for parity with rusEFI #351
• Optional table to change after start idle taper time #369 (thank you, @Krakert!)
• Increased precision available for Lua tables
• Add EGT values to CAN broadcast format #398
• Add options to enable/disable optional CAN frames (cams, EGT so far)
• Add 1-5-4-8-3-7-2-6 and 1-6-5-10-2-7-3-8-4-9 firing orders
• Console command set_sensor_mock now accepts a sensor by name, instead of index. Example: set_sensor_mock CLT 85.5
• TunerStudio UI improvements (#436, etc)
• Dropdown selector for popular gearbox ratios (#358, thank you @alrijleh and @nmschulte!)
• Add two more aux linear sensors #476
• Support wasted spark on odd cylinder count and odd-fire engines. Improves startup and allows running without a cam sensor!
• Add an option for the DFCO MAP threshold to use a table dependent upon RPM #485 (thank you @alrijleh!)
• Option to disable DFCO on gear shift #487
• Ability to use an 8x8 table for after-start fuel multiplier that depends on CLT and engine run time
• Start-up tachometer sweep!

Fixed

• Improve performance with Lua CAN reception of a high volume of frames
• Displayed units in TunerStudio change when switching between volume vs. mass injector flow modes #42
• Make Toyota "3 Tooth Cam" decoder more robust #382
• Flex sensor-derived fuel temperature indication works properly
• Fix a scenario where noisy trigger can cause overdwell rusefi/rusefi#6349
• Fix decel fuel cutoff (DFCO) on engines without a MAP sensor #457
• Automatic calculation of knock sense frequency based on cylinder bore #379
• Removed MAP sampling option that can result in inaccurate MAP sensor readings
• Improve TunerStudio performance on STM32F4-based ECUs #474
• Inhibit VVT control if the cam position sensor dies
• Fix "Alpha-N IAT density correction" option

New Contributors

• @125jdavis made their first contribution in #338
• @dynfer made their first contribution in #409
• @DenisMitchell made their first contribution in #463
• @alrijleh made their first contribution in #471

Full Changelog: release_231224_05...release_240916_02

December 2023 Release: Happy Festivus!

Welcome to the FOME 2312 release!

Breaking Changes

• Simplified VVT single tooth cam modes. "Single tooth second half" and "single tooth first half" have been replaced by simply "single tooth". This may require re-setting your trigger and VVT timing offsets if you used "single tooth first half" prior to this change. #178

Added

• Log per-cylinder true ignition timing (includes trim, knock retard, etc) #76
• Add mode for CLT/IAT sensors that are installed "high side" instead of typical "low side" #116
• Automatic supply voltage compensation for VVT solenoids, giving more stable control as battery voltage changes #209
• Configurable ignition timing limits, adding safety particularly for engines running wasted spark with a large cam #211
• Improved injection, ignition bench test UI and functionality: More gauges, fuel pump on/off buttons for injector testing, and configurable duration/count #219
• Preset for Mazdaspeed Miata (NB) IAT sensor
• Option to compensate Alpha-N fueling with intake air temperature
• Gasoline-scale AFR gauge: instead of showing true AFR, show "gasoline scale" where 14.7 means stoichiometric
• Decode fuel temperature from flex fuel sensors #254
• Allow brief operation over 100% injector duty cycle and add configurable duty cycle limits #215
• Buttons to bump VVT targets for testing/PID tuning
• Improved serial port selection for FOME console and firmware update
• Better default configuration values for some advanced features
• Support BMW E8x/E9x CAN speed sensor input (works for standalone MK60e5 too)

Fixed

• Improved bench test resolution (more usable for testing injectors, dwell, etc)
• Maximum knock retard table displays correct Y axis values in TunerStudio
• Make errors about fuel pressure sensors less aggressive #111 #117
• Always operate in "two wire" mode for batch fuel, fixing batch firing order #23
• Fix "Toyota 3 Tooth Cam" VVT mode (1JZ, 2JZ, 1G, etc) actually works now #237
• Fix autotune while TS project is in AFR mode - corrections now made properly for target AFR table values
• Changing idle stepper settings causes kernel panic #265
• Data log channel "Fuel: Injection timing SOI" indicates correct values

New Contributors

• @rusefillc made their first contribution in #170

• @mi-hol made their first contribution in #171

• @opelpanfan made their first contribution in #270

• @Krakert made their first contribution in #275

Full Changelog: release_230512_01...release_231224_05

May 2023 Release

Welcome to the FOME 2305 release.

Added

• Detected gear and wastegate position to CAN format
• Y axis override for Idle VE table. Helps with idle quality on ITB setups. #94
• Blend tables for boost open and closed loop control #73
• Log channels to make MegaLogViewer VE Analyze work #82
• Enable knock sensing on F407 Discovery build, hardcoded to PA3 #105
• Support gauge and differential fuel pressure sensors (in addition to absolute) #32
• Snapshot builds have a date code in the folder name #91

Fixed

• Sensor checker wasn't checking sensors
• Removed vestigial warning about unset ignition pins #79
• Gear detection sometimes didn't work #86
• Restore built-in INI storage on STM32F7-based ECUs
• Improve log field names, easier to find the channel you're looking for #98

New Contributors

• @nmschulte made their first contribution in #92
• @karniv00l made their first contribution in #106

Full Changelog: release_230411_01...release_230512_01

April 2023 Release: Patch 2

Fixes gear detection so that it works without without pressing the Burn button.

Full Changelog: release_230411_03...release_230411_04

April 2023 Release: Patch 1

Fixes the console updater looking for the wrong binary file to flash.

Full Changelog: release_230411_02...release_230411_03

April 2023 Release

FOME's first release!

Don't expect much, this is just a snapshot so that we have some release published. It may not be polished, but it should work fine enough.