Fueling
Air-Fuel Ratio (AFR) Guide for Honda Tuning
An introduction to Air-Fuel Ratio (AFR) in internal combustion engines, explaining stoichiometric targets, rich vs. lean...
Understanding ECU Fuel and Ignition Maps
An introductory guide explaining how fuel and ignition tables (maps) are structured and interpreted inside Honda ECU ROM...
Closed-Loop Fuel Control
Closed-loop fuel control basics for Honda tuning, including open-loop fallback, wideband and narrowband targets, fuel tr...
Introduction to Honda ECU Tuning
An introductory guide to fuel and ignition tuning on Honda ECUs. Learn how to calibrate air-fuel ratios, timing advance,...
Tuning Honda ECUs for Smog and Emissions Inspections
A comprehensive guide on adjusting fuel and ignition maps in your Honda ECU ROM to pass vehicle tailpipe emissions and s...
Mass Air Flow (MAF) Systems
A Mass Air Flow (MAF) engine management system utilizes a sensor in the intake tract to directly measure the mass of air...
Wideband Oxygen Sensor Integration and Tuning
An overview of wideband oxygen sensor technology, controller options, and integration methods for ECU tuning.
Fuel Injector Offsets Database
A comprehensive database of battery offset (dead time/latency) tables for OEM and aftermarket fuel injectors.
Oxygen (O2) Sensor Technical Reference
Technical guide on Honda narrowband and wideband oxygen sensors, including operating principles, output characteristics,...
Fuel Pressure Tuning and Specifications
Learn how adjusting static fuel pressure affects fuel delivery and injector performance in Honda fuel systems.
Fuel Injector Sizing and Selection
Learn how to correctly calculate and select the appropriate fuel injectors based on your target horsepower and engine mo...
High Impedance Injectors
Technical guide to high-impedance (saturated) fuel injectors on Honda PGM-FI engines, explaining their electrical proper...
Manifold Absolute Pressure (MAP) Sensor
The Manifold Absolute Pressure (MAP) sensor measures engine vacuum and boost, acting as the primary load input for Honda...
OBD1 8-Bit Fuel Calculation Reference
Technical reference for calculating fuel pulse width and duty cycle using 8-bit ROM table values in Honda OBD1 engine ma...
Low Impedance Injectors
Technical guide to low-impedance (peak-and-hold) fuel injectors, inline resistor boxes, and converting between injector...
Volumetric Efficiency (VE)
Volumetric Efficiency (VE) defines the ratio of air/fuel mixture drawn into the cylinder versus its theoretical maximum...