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Thread: Acronym List

  1. #1
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    Acronym List

    Air filter- This device filters the air that goes into your engine. Without an air filter, harmful particles would enter your car's engine and cause internal wear and damage.
    Air pump - Many emissions systems include an air pump, which pumps fresh air into a vehicle's exhaust to help complete the combustion process and reduce emissions. To get accurate lambda measurements with the LM-1, air pumps should be temporarily disabled.
    ASE - After Start Enrichment, the enriched mixture provided for a number of engine cycles when an ECU detects that the engine has transitioned from cranking to running.
    Catalyst - A substance that can increase or decrease the rate of a chemical reaction between substances without being physically consumed in the process. A catalyst, which reduces engine emissions, is used in a catalytic converter.
    Catalytic converter - An in-line, exhaust system device, containing a catalyst, which reduces engine exhaust emissions. Converters are located near the exhaust manifolds or headers for maximum efficiency.
    Closed loop - refers to those times when an EFI computer is using the feedback on the mixture provided by the oxygen sensor to effectively control the injected amounts.
    Combustion - The process by which the air/fuel mixture burns within an engine to create power.
    Computer (PCM) - Many modern cars have a central computer called an engine control unit (ECU) or power train control module (PCM). This controls the car's fuel and ignition systems by taking information from various sensors to determine how to run the engine with the most efficiency and power.
    Converter (Torque) - A fluid coupling device which multiplies torque between an engine and automatic transmission/transaxle. When a vehicle is stopped, a converter allows enough fluid slippage, so the engine can idle without stalling.
    CTS - Coolant Temperature Sensor. Usually the CTS is an NTC (Negative Temperature Coefficient) thermistor, or a resistor whose resistance varies with temperature (NTC means the resistance goes down as the temperature goes up.
    Double overhead cam (DOHC) - A DOHC engine has two camshafts in the cylinder head - one for the exhaust valves, and one for the intake valves. This allows greater efficiency and greater power.
    Driver - A switched electronic device housed in a computer that controls output state. For example, a driver controls how long a fuel injector remains open.
    Duty Cycle (DC)– A number indicating the amount of time that some signal is at full power. In the context of an ECU, duty cycle is used to describe the amount of time that the injectors are on, and to describe the “hold” part of the peak and hold injector drivers (see Low Impedance Injectors, below).
    EGO Sensor - Exhaust Gas Oxygen sensor, used to describe the sensor in the exhaust that measures the lean/rich state of the AFR. Used to control the via a feedback algorithm called “closed loop”.
    Fuel injection - Fuel injection is a system by which fuel is directly sprayed into the intake manifold or intake port at high pressure. Fuel injection is often controlled by a computer, allowing precise monitoring of efficiency and performance by the car's computer.
    Fuel injector - A device for delivering metered, pressurized fuel to the intake system or individual cylinders. An injector sprays fuel, which helps atomization for a more dense mixture, when combined with incoming air.
    Fuel pump - The fuel pump moves gas from the gas tank and delivers it to the fuel injection system or carburetor.
    Fuel starvation - Fuel starvation occurs when fuel, for one reason or another, is prevented from reaching the carburetor or fuel injectors.
    Fuel system - The fuel system is the system by which fuel is stored and delivered to each cylinder. The fuel system includes the fuel tank, fuel tank level sending unit, the fuel pump, the fuel filter, and fuel lines. For carbureted cars, the fuel system also includes the carburetor. For fuel injected cars, the fuel system also includes injectors, fuel pressure regulator and often a main computer.
    G-Force - Unit of measurement used to describe lateral acceleration generated while the vehicle is driven in a steady state turn on a skid pad circle. An average sedan generates 0.60 G of lateral acceleration. Measured in "gravities", one G equals the earth's gravity at sea level.
    High Impedance Injectors - (a.k.a. hi-Z) Fuel injectors designed to work with a simple switch in a 12 volt circuit, no special signal conditioning is required to drive them. The resistance of a high impedance injector is about 10-15 ohms.
    IACIdle Air Control. Typically a “stepper motor”.
    IAT sensor - Intake Air Temperature sensor, measures the inlet air temp.
    Idle circuit - This is a special kind of circuit found in a carburetor that only operates when the engine is at an idle.
    Ignition - Complete system used to step up battery voltage to a higher voltage and deliver it to the spark plug to complete the combustion process. When the key is turned on, the ignition system is energized.
    Ignition Advance/Retard - The advancing or retarding (in crank degrees) of ignition spark relative to the piston location in the cylinder. In performance applications, the goal is to set ignition timing such that peak cylinder pressure occurs at 16-18 degrees after top dead center (TDC).
    Ignition module - Part of the ignition system which instructs the ignition coil to send current to the distributor.
    Ignition system - The ignition system contains the components that supply spark to the vehicle's spark plugs. These include the battery, the ignition coil, the distributor (including the cap and rotor), the spark plug wires, the ignition module, and the spark plugs themselves. Older cars also have ignition points and an ignition condenser.
    Knock (Engine) - The sharp, metallic sound produced when two pressure, or flame fronts collide in the combustion chamber. This could be the result of incorrect ignition timing, incorrect air/fuel mixtures, or the wrong grade (octane rating) of gas. Also known as Detonation.
    kPa (kiloPascals) - the measurement of air pressure used in some ECU computations. Average pressure at sea level is 101.3 kPa.
    Lambda – the ratio between actual air/fuel ratio and stoichiometric ratio. Lambda of less than 1 is rich, and greater than 1 is lean.
    Low Impedance Injectors - (a.k.a low-Z) Fuel injectors that are designed to run at a much lower current than would be supplied by a direct 12 volt connection. They require a special signal that is initially at full current (4-6 amps, a.k.a. “peak current”) for about 1.0-1.5 ms, but then drops down to about 1 amp (“hold current”) for the rest of the opening pulse. The resistance of a low-impedance injector is typically 1-3 ohms.
    MAP sensor - Manifold Absolute Pressure sensor. Measure the absolute pressure in the intake manifold (related to the engine vacuum), to determine the load on the engine and the consequent fueling requirements.
    NB-EGO Sensor - Narrow Band EGO sensor, gives a switch at the stoichiometric ratio (the chemically correct mixture of air and fuel), but unreliable for AFR other than stoichiometric.
    OEM (original equipment manufacturer) - refers to parts produced for initial assembly of a new vehicle.
    Open Loop - refers to those times when ECU ignores the feedback from the oxygen sensor.
    P&H Injectors - Peak and hold injectors; see Low Impedance injectors.
    Pulse Width Modulation (PWM) - A signal with a fixed pulse width (frequency), which is turned on for part of the pulse. The percent of time that the signal is on is called its duty cycle. PWM is used to control voltage (and consequently current) to fuel injectors.
    Required Fuel – For some ECUs and EFI systems, the injector pulse width, in milliseconds, required to supply the fuel for a single injection event at stoichiometric combustion, 100% volumetric efficiency and standard temperature.
    Stoichiometric Ratio- The ratio at which all available fuel is combined with oxygen during the combustion process. This theoretically ideal ratio produces minimum emissions, however maximum power is achieved at an AFR 10-15% richer than stoichiometric, while maximum efficiency is achieved at an AFR 3-5% leaner than stoichiometric (depending on many engine variables).
    TPS - Throttle Position Sensor, a voltage divider that provides information about throttle opening, from which it computes rate of throttle opening for acceleration enrichment.
    VE - Volumetric Efficiency. The actual amount of air being pumped by the engine as compared to its theoretical maximum. A 200 cubic inch motor will theoretically move 200 cubic inches of air in one cycle at 100% efficiency. If the engine is actually running at 75% VE, then it will move 150 cubic inches of air on each cycle.
    WB-EGO Sensor - Wide Band EGO sensor, can be used to derive real AFR data with mixtures from 10:1 to 20:1, i.e. anything you are likely to be interested in.
    WOT - Wide open throttle.
    WUE - Warm Up Enrichment, the enriched mixture applied when the coolant temperature is low.

    This info provided by innovate motorsports website www.innovatemotorsports.com
    Last edited by EC_Tune; 12-29-2006 at 04:47 PM.
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  2. #2
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    ABS-Anti-Lock Brake System
    ADD-Adaptive Driver Demand
    AutoTune-A feature that will soon be available only to people utilizing HPTuners Real Time Tuning Custom Operating systems which will allow the end user to setup some simple guidelines that will allow the scanner to self adjust your PE, VE, MAF, & Idle tables for you while you drive.
    AutoVE-A feature first introduced to the LS1 market by HPTuners to simplify tuning your VE tables by simply copying and pasting the difference of your commanded air fuel ratio as compared to the actual wideband verified air fuel ratio sometimes referred to as "copy paste special".
    AE-Accelleration Enrichment, the enriched mixture provided when the throttle position sensor signal changes at various rates.
    AFR - Air Fuel Ratio, the ratio of air to fuel in the combustion chamber.
    A/F - Air Fuel Ratio see above
    APP Sensor = Throttle pedal on ETC vehicles
    Works in the same way the ETC TPS sensors work: Voltage goes up on one sensor as you press the pedal and goes down on the other. As with the ETC the sensors must agree or the throttle goes closed.

    O2 Sensors
    B1
    -Bank 1 Usually refers to the drivers side ie B1S1
    B2-Bank 2 Usually refers to the passenger side ie B2S1
    S1-Sensor 1 Usually refers to the forward most sensor ie B2S1
    S2-Sensor 2 Usually refers to the 2nd sensor in stream ie B1S2
    S3-Sensor 3 Usually refers to the 3rd sensor in stream B1S3

    BCC-
    Broadcast code
    BCM-Body Control Module
    BE-Boost Enrichement
    Bobble Torque Management-Similar to GM's M6 spark smoothing its a "jerkiness remover" for low rpm clutch out driving
    C.A.G.S.-Computer Assisted Gear Selection
    CAN-Controller Area Network
    CCM-Chassis Control Module
    CLIP-Closed Loop Intervention Prevention
    CMCV-Charge motion control valve
    COS-Custom Operating System
    COT-Cat Over Temp
    CR-Compression Ratio
    CSB-Cool Story Bro
    BLM-Block Learn Memory...also usually referred to as Fuel Trims.
    DMR-Direct Memory Access
    DTC-Diagnostic Trouble Code
    DFCO-Deceleration Fuel Cut Off
    Fuel is cut off when at medium RPM and closed throttle settings. Used to lower emissions and improve fuel economy. Can also simply reduce fuel during decreasing throttle transients.

    ECT-Engine Coolant Temp
    EEC-Electronic Engine Control
    EGR-Exhaust Gas Recirculation
    Introduces exhaust gas into the intake system to reduce NOx (Oxides of Nitrogen and Nitric Oxide - NO -- Very poisonous BTW!) emissions. Achieved by cooling the combustion with inert gas (exhaust). Some systems now cool the exhaust gas before introducing it to the intake system for further NOx reduction. A side benefit (minor) is that pumping losses in the engine are reduced with a slight improvement in gas mileage. Previous statement applies *mostly* to Linear EGR valves and systems.

    EGT-Exhaust Gas Temperature
    EOT-Engine oil temp
    ETC-Electronic Throttle Control
    Drive by wire throttles. No cables. ETC encompasses a stepper motor drive to open and close the throttle and two TPS sensors. On one the voltage output increases as the throttle is opened the other decreases as the throttle is opened. If the sensors do not agree then the throttle is closed.
    ESP-Electronic Stability Program
    FA-Fuel/Air
    FCM-Fan Control Module
    FDCM-final drive control module
    FI-Fuel Injected OR Forced Induction
    FTC-Fuel Trim Cell
    FPCM-Fuel pump control module
    FSO-Fuel Shut Off
    IDC-Injector Duty Cycle
    IFR-Injector Flow Rate
    IMRC-Intake manifold runner control
    IPW-Injector Pulse Width
    In. Hg-Inches of mercury
    KR-Knock Retard

    KISS-Keep it simple, stupid
    LID = Live In Drive (paddle pressed while in Drive)
    LTFT
    -Long Term Fuel Trims
    LTIT-Long Term Idle Trims
    Long term adjustment to cover myriad operating conditions. Is a stored value in NV RAM

    Labtop-http://www.urbandictionary.com/define.php?term=labtop

    MAF-Mass Air Flow
    MAS-Mass Airflow Sensor
    MAP-Manifold Air Pressure
    MCT-Manifold charge temp
    MBT-Mean Best Torque
    MDS-multiple displacement system(DOD)
    MIL-Malfunction Indicator Light
    MPH-Miles Per Hour
    MPID-Memory Parameter Identification Data
    MTV-manifold tuning valve
    NA-Naturally Aspirated
    N/V-N being engine speed, V being vehicle speed
    Ms-milliseconds
    NV RAM = Non-Volitile Random Access Memory - doesn't lose it's memory when key is turned off.
    OLFA-Open Loop Fuel Adder
    OEM-Original Equipment Manufacturer
    OBD-On Board Diagnostics
    PATS-Passive Anti-Theft System
    PCM-Powertrain Control Module
    PE-Power Enrichment
    PR-Baro / MAP
    PRTHF-Please read the help file a nice way of saying RTFM see RTFM below
    PICNIC-Problem in chair, Not in computer
    PID-Parameter Identification Data
    RAF-Running Air Flow
    How much air in lbs/hr or grams/Sec (g/sec) needed to keep the engine idling without stall/surge.
    RTFM-Read the F&*%$#@g manual

    Read or Re-read your pcm-The act of opening the editor software and clicking the Read Entire button to initiate reading the current file off of your pcm.

    Reopen or open your file-The act of opening the editor software & clicking the file-open button to intitiate opening a specific file that was previously read or saved.

    RPM-Revolutions Per Minute

    RTT-Real Time Tuning

    RWHP-Rear Wheel Horsepower
    RWTQ-Rear Wheel Torque

    Scan your PCM-The act of opening your VCM Scanner to log data ie Engine RPM, Vehicle speed, Spark advance, etc.

    SD-Speed Density
    SES-Service Engine Soon
    SST = Select Shift (paddles pressed in sport and locked in)
    STFT
    -Short Term Fuel Trims
    STIT-Short Term Idle Trims
    Quick adjustment to control engine speed and prevent stall. Not stored in NV RAM

    Soon-Sometime Out Of Nowhere, a fortnight, "2 weeks"

    TAC = Throttle Actuator Control Module
    Translates between APP Sensor and ETC to create the proper throttle opening. Interfaces with ECM to provide torque management and current throttle position. Also used on *some* cable actuated cars for torque management by relaxing the throttle cable when torque managment is requested.

    TCM-Transmission Control Module
    TQMT-Torque Management
    TM-Torque Management
    Used to control wheel spin or slip (think icy roads or TT vehicles) in conjunction with the anti lock brake system (ABS). Reduces engine power by reducing torque output of the engine usually by reducing spark advance considerably or closing the throttle on ETC vehicles. Also used to prolong transmission life (at least through warranty...) by reducing engine output (reducing spark advance) during shifts.

    TT = Twin Turbo (usually)
    VATS-Vehicle anti-theft system
    VE-Volumetric efficiency
    VID-Vehicle Identification
    VCM-Vehicle Control Module
    VCT-Variable Cam timing
    VSS-Vehicle Speed Sensor

    Some of these were found in this thread http://www.hptuners.com/forum/showth...&highlight=TAC as well as others.
    Thanks to anyone that helped or gave info or links to these.
    Last edited by Bill@HPTuners; 06-26-2019 at 03:21 PM.
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  3. #3
    Potential Tuner Joe Castrellon's Avatar
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    So I was reading "BEFORE POSTING TO ASK FOR HELP!! read this first", and see "Dynamic airflow with SD and MAF airflow with MAF". Look here and don't see "SD". Pretty sure it's not Scooby Doo. What is SD?

  4. #4
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    Added to the list
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  5. #5
    Potential Tuner Joe Castrellon's Avatar
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    Thank you!

  6. #6
    Tuner in Training
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    This is great... helps alot.


    Will there be a test??

  7. #7
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    Quote Originally Posted by thunderkyss View Post
    This is great... helps alot.


    Will there be a test??
    Yes, on friday
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  8. #8
    Tuner gr8vet's Avatar
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    What does RAF stand for?

    thanks
    tt

  9. #9
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    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  10. #10
    Tuner gr8vet's Avatar
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    Thanks Bill, not sure if you added that or if I just missed it totally. Thanks!

    tt

  11. #11
    HP Tuners Support
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    Nope, its been there the whole time.
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  12. #12
    Tuner in Training
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    What is SAE?

  13. #13
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    Quote Originally Posted by Dirty 30 View Post
    What is SAE?
    Society of Automotive Engineers
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  14. #14
    Tuner in Training
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    oh its cause i keep seeing it in the scanner, wasnt sure if it was the same thing.

  15. #15
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    Nbs?
    Janky Monkey Tuning

    Call or PM for tuning solutions.

    Cell 210-954-4985

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    Tune your own? Start here ----> Open Editor ---> Hit F1...READ!

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    Still lost? Consult a Pro!

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  16. #16
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    Quote Originally Posted by Cantalope Kid View Post
    Nbs?
    New Body Style.
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  17. #17
    Tuner in Training douglasmelter's Avatar
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    ecu?

  18. #18
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    Engine control unit
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  19. #19
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    I'm glad I finally ran across this thread. I've subscribed to it! Thank you Bill.
    2016 GMC Sierra 1500 6.2L

  20. #20
    Lnf?