• Absolute Pressure = pressure measured on a scale where Absolute Vacuum = 0
• Absolute Vacuum = the state where there are no gas molecules present
• Atmospheric Pressure = the pressure of air around you
• Boost = Pressure greater than atmospheric pressure
• Air Fuel Ratio = ratio between air and fuel entering engine

• Ecu Sensors = Sensors that the ECU monitors in order to run the motor properly.

• Atmospheric Pressure = the pressure of air around you
• Boost = Pressure greater than atmospheric pressure
• Absolute Pressure = pressure measured on a scale where Absolute Vacuum = 0
• Absolute Vacuum = the state where there are no gas molecules present
• Air Fuel Ratio = ratio between air and fuel entering engine. critical

Stock ECU Code Features

Stock ECU Code Features

Physics, Thermodynamics, Engine Management Theory

• Ideal Gas Law = equation explaining relationship between gas properties
• Speed Density = the type of engine management philosophy used in Honda ECUs.
• Volumetric Efficiency = the efficiency of an engine at pumping air in a given state
• Mass Air Flow = A type of engine management system that directly measures air entering the motor. Not typically found on Hondas, but common on other manufacturers.

%META:TOPICINFO{author="pelz" date="1082391405" format="1.0" version="1.1"}%

Vocab:

• ECU = Engine Control Unit
• OBD0 = the first unofficial generation of honda engine electronics
• OBD1 = the second unofficial generation of honda engine electronics
• OBD2 = the first official standard for engine electronics
• EDM = European Domestic Market
• JDM = Japanese Domestic Market
• USDM = United States Domestic Market
• Check Sum = what is a checksum? What kind of checksums do honda ECUs use?
• Manual Checksum = how do I fix a checksum by hand?
• Bin File = what is a bin file?
• Hex File = what is a hex file?
• Hex2 Bin = how to convert hex files to bin files
• Pulse Width Modulation = PWM which is frequently used to do DAC
• DAC = Digital to Analog Conversion
• ADC = Analog to Digital Conversion
• Absolute Pressure = pressure measured on a scale where Absolute Vacuum = 0
• Absolute Vacuum = the state where there are no gas molecules present
• Atmospheric Pressure = the pressure of air around you
• Boost = Pressure greater than atmospheric pressure
• Air Fuel Ratio = ratio between air and fuel entering engine
• RPM = Revolutions Per Minute = how fast the motor is spinning
• Pre Ignition = "knocking" or "detonation" - destructive combustion of fuel without a spark

Devices/Hardware:

• ECU = Engine Control Unit
• Ecu Sensors let the ECU interact with the world.
• Rom Burner programs chips
• Rom Emulator a device that "looks" like a ROM but allows changes in realtime
• Engine Simulator A workbench ECU testing and tuning device. (Work in Progress.)
• Boost Controller = device to adjust boost pressure levels
• Waste Gate = device to limit boost with a turbocharger
• Exhaust Gas Temp Sensor = ''EGT'' - measures the temperature of exhaust gases
• Wide Band O2 = ''wideband'' - a device to measure a (relatively) broad range of Air Fuel Ratios

Stock ECU Code Features

• Dual Tables = fuel and timing mapping for two separated states on the same ROM. Used with Vtec motors.
• Rev Limiter = limits engine rotation to a safe RPM
• Speed Limiter = limits a vehicles top speed
• Data Logging = most ECUs have some provision for datalogging in the factory code.
• ECU-Code Compatibility = Most ECUs can run a wide variety of programs other than the one from the factory

PGMFI-Hacked Features/Code (duplicates indicate modifications)

• Dual Tables = added to non-Vtec ECU code to run a Vtec motor properly, and as part of ECUNitrous Control
• Add Boost = What does Crome ROMEditor or Uber Data ERM do to make the ECU understand boost?
• ECUBoost Controller = What is the Boost Controller portion of Uber Data ERM and how does it work?
• ECUNitrous Control = Code for the ECU to turn a nitrous solenoid on/off (and also implement Dual Tables and other stuff.)
• Data Logging = often, code mods are needed for solid datalogging.
• Launch Control = a "two-step" revlimiter - low revlimit while stationary for consistent launches
• Full Throttle Shift - For ricer glitz full-throttle shifting w/o grenading your motor