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Revision as of 13:32, 16 February 2026 by Gurov (talk | contribs) (Created page with "# Weekly Digest: November 18–22, 2025 ## Highlights - [epicEFI Firmware Changelog](../2025-11-18_epicefi-firmware-changelog.md) — Comprehensive changelog of all epicEFI features through September 2025 - [AFR vs Lambda](../2025-11-18_afr-vs-lambda-tuning.md) — Understanding fuel target units in epicEFI - [MAF Sensor Tuning Basics](../2025-11-19_maf-tuning-basics.md) — MAF transfer functions, MAF/MAP blend mode - [Rotational Idle](../2025-11-22_rotational-idle-fe...")
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  1. Weekly Digest: November 18–22, 2025
    1. Highlights

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

    1. 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

    1. 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

    1. Feature Spotlight

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

  1. Weekly Digest: December 1–7, 2025
    1. Highlights

- [TCU Transmission Control](../2025-12-02_tcu-transmission-control.md) — Automatic transmission control for Toyota A340 and similar

    1. 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

    1. Support & Troubleshooting

- General tuning discussions and community support throughout the week

  1. Weekly Digest: December 8–14, 2025
    1. Highlights

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

    1. 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

    1. 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

  1. Weekly Digest: January 1–7, 2026
    1. Highlights

- [EpicTuner v0.1.0-alpha](../2026-01-05_epictuner-alpha-release.md) — First alpha release of the cross-platform tuning application

    1. 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

  1. Weekly Digest: January 8–12, 2026
    1. Highlights

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

    1. 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

    1. 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)

  1. Weekly Digest: January 13–19, 2026
    1. Highlights

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

    1. 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

    1. 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

  1. Weekly Digest: January 20–26, 2026
    1. Highlights

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

    1. 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

  1. Weekly Digest: January 27 – February 2, 2026
    1. Highlights

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

    1. 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

    1. 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

  1. Weekly Digest: February 3–9, 2026
    1. Highlights

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

    1. 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

    1. 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

  1. Weekly Digest: February 10–16, 2026
    1. Highlights

- [TCU A340 Setup Guide](../2026-02-12_tcu-a340-setup-guide.md) — Detailed Toyota A340 4-speed automatic transmission control setup

    1. 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 [TCU overview](../2025-12-02_tcu-transmission-control.md) with specific wiring and configuration details

    1. Community

- Continued general tuning support and firmware discussion throughout the week

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