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= Weekly Digest: November 18–22, 2025 =

== Highlights ==
* [[2025-11-18_epicefi-firmware-changelog.md|epicEFI Firmware Changelog]] — Comprehensive changelog of all epicEFI features through September 2025
* [[2025-11-18_afr-vs-lambda-tuning.md|AFR vs Lambda]] — Understanding fuel target units in epicEFI
* [[2025-11-19_maf-tuning-basics.md|MAF Sensor Tuning Basics]] — MAF transfer functions, MAF/MAP blend mode
* [[2025-11-22_rotational-idle-feature.md|Rotational Idle]] — Programmable ignition skip patterns for smooth idle

== Technical Discussions ==
* '''AFR vs Lambda internals''': How epicEFI handles Lambda 1.0 internally and converts to AFR for display, why stoich varies by fuel type (14.7 gasoline, 9.8 E85)
* '''VE and ignition table setup''': Beginner guide to configuring VE tables, ignition timing, and understanding MAP-based load axes
* '''MAF/MAP blend''': Running both air metering models simultaneously with configurable weighting per operating point
* '''Lean cruise strategies''': Running Lambda 1.05–1.10 at light loads for fuel economy, timing compensation for lean mixtures

== Hardware & Wiring ==
* '''EPIC CAN Bus''': External device control via CAN bus protocol for dash integration
* '''ETB TPS redundancy''': Toyota throttle body dual-TPS modes and failsafe behavior

== Feature Spotlight ==
* '''Rotational Idle''': A unique feature that skips ignition on specific cylinders in a rotating pattern to reduce idle vibration without lowering RPM


= Weekly Digest: December 1–7, 2025 =

== Highlights ==
* [[2025-12-02_tcu-transmission-control.md|TCU Transmission Control]] — Automatic transmission control for Toyota A340 and similar

== Technical Discussions ==
* '''Transmission control''': epicEFI's TCU supports simple solenoid-based automatics (one solenoid changes per shift), with input shaft speed sensing for shift timing
* '''Line pressure tuning''': Firmware-based shift firmness control replicating aftermarket shift kit behavior
* '''Gear range limiting''': How the manual selector lever's hydraulic limits interact with TCU firmware

== Support & Troubleshooting ==
* General tuning discussions and community support throughout the week


= Weekly Digest: December 8–14, 2025 =

== Highlights ==
* [[2025-12-08_ve-table-map-multiply-explained.md|VE Tables and MAP Multiply]] — Why VE tables have curved shapes and the math behind it

== Technical Discussions ==
* '''VE-to-MAP relationship''': Detailed experiment showing the 1/x inverse relationship between MAP and required VE compensation, explaining why VE tables are non-linear
* '''Choked vs non-choked flow''': Airflow behavior changes at ~52 kPa, making idle-region VE tuning especially tricky
* '''Injector dead time tuning''': Using epicEFI's sequential/batch switching tool to precisely calibrate injector dead times, signs of incorrect dead times, and why most enthusiasts skip this step

== Key Numbers ==
* VE at 25 kPa needs ~400% to match 100 kPa baseline
* Flow behavior changes at ~52 kPa (choked flow threshold)
* Dead time errors show up as AFR differences between sequential and batch firing modes


= Weekly Digest: January 1–7, 2026 =

== Highlights ==
* [[2026-01-05_epictuner-alpha-release.md|EpicTuner v0.1.0-alpha]] — First alpha release of the cross-platform tuning application

== Feature Updates ==
* '''EpicTuner alpha release''': Modern cross-platform tuning software by @sangawku supporting Windows x64, macOS ARM64, and Linux x64
* Key features: drag-and-drop dashboards, 2D table editor with 3D visualization, curve editor, real-time data streaming, built-in logging
* Portable application — no installer needed, reads INI directly from ECU
* Aims to provide TunerStudio paid features (VE Analyze, composite logging) as standard for epicEFI users


= Weekly Digest: January 8–12, 2026 =

== Highlights ==
* [[2026-01-08_first-start-troubleshooting.md|First Start Troubleshooting]] — 4G63 cranking troubleshooting, acceleration enrichment, MBT timing
* [[2026-01-09_firmware-variable-access-lua.md|Firmware Variables in Lua]] — Accessing firmware variables via Lua and output channels
* [[2026-01-10_injector-decapping-reference.md|Injector Decapping Reference]] — Bosch/Denso/Deka injector identification, Honda coil dwell
* [[2026-01-11_pcb-design-ecu-boards.md|PCB Design for ECU Boards]] — Layout rules, crosstalk prevention, ground pour strategies

== Technical Discussions ==
* '''4G63 first start''': Step-by-step troubleshooting from cranking through idle, including trigger sync, fuel prime, and acceleration enrichment wall-wetting model
* '''Lua firmware access''': How to read/write firmware variables from Lua scripts, with BMW CAN torque example
* '''Injector identification''': How to identify unmarked injectors by decapping and examining internal structure

== Hardware & Design ==
* '''PCB best practices''': Trace spacing rules for high-current paths, crosstalk prevention between signal and power traces, ground pour debate (full pour vs strategic routing)


= Weekly Digest: January 13–19, 2026 =

== Highlights ==
* [[2026-01-13_wideband-lambda-sensor-setup.md|Wideband Lambda Sensor Setup]] — 14point7/Spartan wideband configuration for E85
* [[2026-01-14_acceleration-enrichment-predictive-map.md|Acceleration Enrichment & Predictive MAP]] — AE tuning strategies and predictive MAP model
* [[2026-01-16_new-user-onboarding-m144h7.md|M144H7 Onboarding]] — Getting started with M144H7 boards
* [[2026-01-17_user-tables-arbitrary-variables.md|User Tables]] — Arbitrary variable lookup tables for custom corrections

== Technical Discussions ==
* '''Wideband for E85''': Configuring 14point7/Spartan widebands for flex fuel, free-air calibration procedure, sensor conditioning
* '''Predictive MAP''': How the ECU predicts manifold pressure during transients for better fueling before the MAP sensor catches up
* '''DFCO''': Deceleration fuel cutoff configuration and re-engagement strategies

== New User Support ==
* '''M144H7 board setup''': Pin mapping, firmware variant selection, EGT sensor wiring, SD card logging configuration
* '''User Tables feature''': Creating custom correction tables with arbitrary X/Y axes selected by variable hash


= Weekly Digest: January 20–26, 2026 =

== Highlights ==
* [[2026-01-24_custom-trigger-wheel-design.md|Custom Trigger Wheel Design]] — Trigger wheel tooth patterns and BMW N63TU cam sync
* [[2026-01-25_hall-sensor-trigger-edge-and-tune-corruption.md|Hall Sensor Edges & Tune Corruption]] — Hall sensor edge selection, corrupt tune recovery

== Technical Discussions ==
* '''Trigger wheel design''': Choosing tooth count and missing tooth patterns, how the ECU achieves sync, BMW N63TU twin-turbo V8 cam sync challenges
* '''Hall sensor edges''': Rising vs falling edge selection for Hall-effect sensors, how incorrect edge selection causes timing errors
* '''Tune corruption''': How corrupt Lua scripts in MSQ files can brick the ECU config, firmware backup architecture and recovery procedures


= Weekly Digest: January 27 – February 2, 2026 =

== Highlights ==
* [[2026-01-28_can-bus-protocol-reference.md|CAN Bus Protocol Reference]] — 0x701/0x721 protocol details, virtual outputs, tune database
* [[2026-01-30_vanos-vvt-calibration-procedure.md|VANOS/VVT Calibration]] — BMW M54 VANOS procedure using epic_can_proxy
* [[2026-01-31_etb-setup-guide.md|ETB Setup Guide]] — Electronic throttle body configuration, VR sensor polarity

== Technical Discussions ==
* '''CAN bus protocol''': Detailed reference for epicEFI CAN message IDs 0x701 and 0x721, virtual output configuration for CAN-controlled devices
* '''VANOS calibration''': Step-by-step BMW M54 variable valve timing calibration using CAN serial proxy for remote tuning
* '''Tune sharing database''': Community effort to build a shared database of known-good tunes for common engine configurations

== Hardware & Setup ==
* '''ETB configuration''': Electronic throttle body setup procedure including auto-calibration, pedal mapping, and PID tuning
* '''VR sensor polarity''': How to verify VR (variable reluctance) crank sensor polarity and the consequences of reversed wiring
* '''Ignition cut warning''': Using ignition cut as an over-rev warning before hard rev limiter


= Weekly Digest: February 3–9, 2026 =

== Highlights ==
* [[2026-02-04_acceleration-enrichment-async-fuel.md|Async Fuel AE Strategy]] — New acceleration enrichment approach using asynchronous fuel injection
* [[2026-02-05_sensor-grounding-best-practices.md|Sensor Grounding Best Practices]] — GND vs GNDA, H7 power requirements
* [[2026-02-08_epictuner-troubleshooting.md|epicTuner Troubleshooting]] — Common epicTuner issues, ETB manual calibration, YoloSync
* [[2026-02-09_wideband-o2-heater-management.md|Wideband O2 Heater Management]] — Bosch heater profile, OEM vs aftermarket controllers

== Technical Discussions ==
* '''Async fuel AE''': New acceleration enrichment strategy that injects additional fuel asynchronously (not timed to intake valve opening) combined with MAP prediction for faster transient response
* '''Wideband heater profiles''': How Bosch LSU 4.9 heater management works, differences between OEM and aftermarket controller implementations, cold-start heater ramp strategies

== Hardware & Wiring ==
* '''Sensor grounding''': Why sensor ground (GNDA) must be separated from power ground (GND), star grounding topology, H7 board power requirements and voltage regulator considerations
* '''epicTuner tips''': MAP_PRE channel for predictive MAP visualization, YoloSync mode for quick trigger testing, ETB manual calibration fallback procedure


= Weekly Digest: February 10–16, 2026 =

== Highlights ==
* [[2026-02-12_tcu-a340-setup-guide.md|TCU A340 Setup Guide]] — Detailed Toyota A340 4-speed automatic transmission control setup

== Technical Discussions ==
* '''A340 TCU setup''': Complete setup guide for Toyota A340 transmission control including solenoid wiring, gear state table configuration, range selector input, and TCC (torque converter clutch) PWM strategy
* Builds on the earlier [[../2025-12-02_tcu-transmission-control.md|TCU overview]] with specific wiring and configuration details

== Community ==
* Continued general tuning support and firmware discussion throughout the week