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+# Abbreviations and Terminology
+
+## This document contains all of the commonly used abbreviations and terminology used by rusEFI
+
+TFSI - Turbo Fuel Stratified Injection - A VW direct injection lean burn strategy
+GDI - Gasoline Direct Injection
+EGR - Exhaust gas recirculation
+DI - Direct injection
+Hall - A type of sensor that requires a power and earth wire in addition to its signal wire, the output is normally a 5v square wave.
+High side -
+Low side
+High/Low driver
+SMD - Surface mount device, interchangeable with SMT
+SMT - Surface mount technology, interchangeable with SMD
+VANOS - BMW variable valve timing system
+Valvetronic - BMW variable valve lift system
+DISA - BMW variable inlet manifold resonance system
+VISA - BMW variable inlet manifold length system
+ETB - Electronic throttle body
+PID -
+VSS - Vehicle speed sensor
+VCC -
+VDD
+TLE - Short for TLE8888 the Infineon chip on the MRE
+RE - rusEFI
+REO - rusEFI Online
+MRE - Micro rusEFI
+PNP - Plug and play
+NTC - Negative temperature coefficient, used in context of temperature sensors and refers to the resistance increasing as temperature decreases.
+PFI - Port fuel injection
+MBT - Mean best timing, used in context of spark timing, it is the spark timing that results in the best torque
+MFB - Mass fraction burned, often stated with a number after i.e. MFB10/MFB50/MFB90 and refers to the fraction of the fuel burned by mass.
+CR - compression ratio
+Stoichiometric - The ideal quantity of fuel to burn with a quantity of air for complete combustion. For gasoline this is 14.7:1, ethanol is 9:1 and methanol 6.47:1
+TVIS - Toyota variable intake system, a variable inlet length system that switches on/off a set of longer intake manifold runners.
+IMEP - Indicated mean effective pressure
+IVC - Intake valve closing
+EVC - Exhaust valve closing
+IVO - Intake valve opening
+EVO - Exhaust valve opening
+SI - Spark injection
+VVT - Variable valve timing
+CoV - Coefficient of variability
+EGT - Exhaust gas temperature
+BMEP - Brake mean effective pressure
+High and low Z - High and low resistance, used in terms of fuel injectors, normally around 14 ohms for high impedance and ~4 ohms for low.
+Injector impedance - The resistance of the fuel injectors, see high and low Z
+Smart coil - A type of ignition coil that has its ignition drivers (IGBT) built into the coil, this means they only receive a 5v signal to activate.
+Primary coil - The primary winding of an ignition coil
+Secondary coil - The secondary winding of an ignition coil.
+LQFP - Low profile quad flat package
+SOIC - small outline integrated circuit
+TE - TE connectors, they produce the ampseal connectors on the proteus and a lot of OEM ECUs.
+
+
+
+
+
+
+
+AAP
+
+Absolute Atmosphere Pressure
+AFR
+
+Air Fuel Ratio - See also Lambda, Stoichiometric
+AFR is the ratio of air to fuel, often expressed as "14.7:1"
+AIT
+
+Air Intake Temperature
+Baro
+
+Shorthand for Barometric pressure
+BTDC
+
+Before TDC, Before Top Dead Center - See also ATDC
+CAS
+
+Crank Angle Sensor Also See [CPS](http://en.wikipedia.org/wiki/Crankshaft_position_sensor)
+CLT
+
+Coolant Temperature
+CPS
+
+Crankshaft Position Sensor
+EDIS
+
+Electronic Distributorless Ignition System - An older Ford ignition system that combined a set of ignition IGBTs and some electronics to assist the ECU. Obsolete on modern ECUs.
+EGO
+
+Exhaust Gases Oxygen - see also lambda sensor, WBO2,
+Often used when referring to air fuel sensors like the lambda sensor.
+Sometimes also used as HEGO or Heated Exhaust Gas Oxygen.
+EOI
+
+End Of Injection - See also SOI
+IFR
+
+Injector Flow Rate
+IGBT
+
+http://en.wikipedia.org/wiki/Insulated-gate_bipolar_transistor
+A common type of transistor used for switching high power devices like ignition coils with a low power/voltage output.
+IPW
+
+Injector Pulse Width
+MAF
+
+Mass Air Flow, often used in the context of air flow or load sensors.
+MAP
+
+Manifold Absolute Pressure or perhaps Manifold Air Pressure, often used in the context of load sensors.
+NGC
+
+Chrysler Next Generation Controller
+PIP
+
+Profile ignition pickup See http://en.wikipedia.org/wiki/Profile_ignition_pickup
+RUSEFI
+
+Really Uber Simple EFI? Robust Ultra Simple EFI? Retarded Unproven Shitty EFI?
+SOI
+
+Start Of Injection - See also EOI
+Sequential
+
+Often this refers to Sequential injection, which means the injectors fire individually for each cylinder and often at a specific crank angle.
+This can be handy for engines direct injection or to try to spray the injector into the cyl while the intake valve is open. If an engine can inject onto an open inlet valve it will reduce the amount of fuel wetting the port walls and help reduce low load emissions.
+Sequential is required for direct injection engines like common rail diesel.
+SD
+
+Speed Density this is a method of predicting how much fuel should be delivered to an engine. This is a MAP based system which uses pressure to make a prediction of how much O2 is entering the cyl.
+Staged injection
+
+The use of 2 injectors for one cyl. This commonly means at low RPM and lower loads, one injector is turned on which allows for finer control over idle fuel delivery, while at higher RPM and higher Loads both injector inject fuel which allows for larger amounts of fuel to be delivered.
+TDC
+
+Top Dead Center
+TFI
+
+Thick Film Ignition - Ford distributor - Likely unsupported at this time.
+VE
+
+Volumetric Efficiency, often expressed as a decimal value i.e. 0.8 (for 80%)
+VOL
+
+Short for engine volume
+WOT
+
+Wide Open Throttle
+