Terms and Acronyms and general info

HolyCrapItsFast

Drinks beer!
Below you will find a list of common acronyms that you most undoubtedly heard before. This list explains their meaning.

Please feel free to come up with more. If you know of any and don't see it here then please post it up and I will update the list.

I would like to thank the Elite group for helping me out so far... This still needs some work and is considered a living document.

Thanks allot guys! :tup:
 
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HolyCrapItsFast

Drinks beer!
General Acronyms and Other Info

STI Colors:

GD...

WRB - World Rally Blue
PSM - Platinum Silver Metallic
SGM - Silver Gray Metallic
CGM - Crystal Gray Metallic
UGM -Urban Gray Metallic
OBP - Obsidian Black Pearl
JBP - Java Black Pearl
SWP - Silver White Pearl
AW - Aspen White

GR/GV...
WRB - World Rally Blue
SSM - Spark Silver Metallic
SWP - Silver White Pearl
DGM - Dark Gray Metallic
OBP - Obsidian Black Pearl
LR- Lazer Red
AW - Aspen White

Body Style and Refernces

93-01 GC
02-03 GDA, Bug eye
04-05 GDB, Blob eye or Peanut eye
06-07 GDB, Hawk eye
08-10 GR, Stink Eye or Vag eye :lol:
11 Sedan GV, Stink Eye

Technical Acronyms


AFR - Air Fuel Ratio

AP - AccessPort

An after market engine management system that utilizes the stock ECU. This is known as a re-flash solution where you modify the programing via a laptop with special software and then flash the new programming to the stock ECU via this device. Links to related material: http://www.igotasti.com/vBforum/showthread.php?213-Newbies-Guide-to-Logging, http://www.igotasti.com/vBforum/showthread.php?435-Engine-Management

AVCS - Active Valve Control System

Valve timing system utilizing oil pressure to fill a chamber with in a rotating assembly that attaches to the end of the cam. The cam itself is attached to a rotor inside the chamber. As the chamber fills with oil the rotor is forced to rotate to an advanced state. The oil flow is controlled by a solenoid activated by a pulsed signal that is controlled by the ECU. The higher the duty cycle, the greater the advance. Link to writ-up

BAR
Unit of measure for pressure commonly used in the European union.

BOV - Blow Off Valve
Link to Writeup

BPV - Bypass Valve
Link to Writeup

CL - Closed Loop
Refers to the Closed Loop operation of the engine. In Closed Loop operation the ECU is monitoring the AFR sensor and making adjustments to fuel based on that reading.

ECT - Engine Coolant Temp

ECU - Engine Control Unit

This is the brains of the engine. This computer reads input from various sensors and uses that information to control fuel spark and boost.

EGR - Exhaust Gas Recirculation
Refers to either a physical EGR valve on an engine used to recirculate exhaust gases back to the intake to be re-burned during light load and cruise RPM to help reduce emissions. Also refers to vehicles that employ Valve Timing to achieve the same goal through valve overlap.

EGT - Exhaust Gas Temperature

DAM - Dynamic Advance Multiplier
A term used by AcessTuner Race and the Access port. This is a parameter that the ECU uses to apply more or less advance to the primary ignition table. It is referenced by the ignition advance table. The advance defined in your ignition advance table is multiplied by DAM and then added to the primary ignition. The final result is your total ignition advance plus any other compensations.

DCCD - Driver Control Center Differential
The planetary center differential in the wrx sti splits engine torque in variable ratios between the front and rear wheels. It also gives the driver a choice – leave ratio choice to computers or set it yourself (Text copied from Paul C's writeup). Link to Writeup

IAM - Ignition Advance Multiplier
Same as DAM only an acronym used by RomRaider

IAT - Intake Air Temp

This usually refers to one of the ECU inputs for Air Intake Temperature and is measured at the intake. More specifically there is a thermocouple resistor located in the MAF sensor assembly and is considered part of the MAF sensor.

IDC - Injector Duty Cycle
Link to Writeup

IPW - Injector Pulse Width
This is a pulsed signal that is calculated by the ECU and ultimately supplied to the injector to deliver the required amount of fuel to the engine. The ECU determines the amount of fuel to be delivered by shortening or lengthening the pulse. This is the time the injector is open while delivering fuel. This is not to be confused with IDC. IDC has nothing to do with how much fuel is delivered.

kPa - Killo Pascals
Standard unit of measure for pressure

MAF - Mass Air Flow
Refers to the sensor typically located in the intake just after the air filter. The sensor is responsible for measuring the mass of air entering the engine and is measured as weight of air over time = flow In this case, g/s or grams per second = flow

MAP - Manifold Absolute Pressure
Refers to the sensor typically located in the intake manifold or throttle body and is responsible for measuring the manifold pressure in psi plus atmospheric pressure. So if your manifold pressure is 7psi, the reading at the sensor will be 7psi plus 14.7psi atmosphere for a total of 21.7psi.

MRP - Manifold Relative Pressure
This is related to MAP but the difference is that this reading is pressure that is relative to the manifold only where by 0psi of Manifold Relative Pressure is 14.7psi of Manifold Absolute Pressure.

MPa - Mega Pascals
The standard unit of measure for pressure

OEM - Original Equipment Manufacturer

OL - Open Loop
Refers to the open loop operation of the engine. In Open Loop the ecu does not take into consideration input from the O2 sensor nor does it make corrections based on the O2 sensor. In Open Loop the ECU uses the MAF sensor combined with a look up table to calculate the required amount of fuel.

PCV - Positive Crankcase Ventilation

PSI - Pounds per Square Inch
Unit of measure for pressure used primarily in the US

RR - RomRaider
Similar to the AccessPort, RomRaider is a software re-flash solution where you modify programming via a lap top using the RomRaider software and then flash it to the car utilizing the Tactrix OpenPort 2.0 interface. The software is free but you must purchase the OpenPort. Links to related material: http://www.igotasti.com/vBforum/showthread.php?213-Newbies-Guide-to-Logging, http://www.igotasti.com/vBforum/showthread.php?435-Engine-Management

TGV - Tumbler Generator Valve
Refers to the section of runners between the intake manifold and the head, this device is used to divert air around the injector outlet to aid in the atomization and mixing of fuel and air by creating an air tumbling effect. The advantage to this is a much cleaner burn and smoother operation at idle and very light load and rpm. With this comes some sacrifice to high speed flow. When people refer to TGV deletes the are referring to the removal of the butterfly valves inside this device to improve top end flow and overall drivability.

WOT - Wide Open Throttle
 
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Grinder34

Track Monkey
Terminology FAQ

I started this thread to define frequently-used terms in the car world that may not be self-explanatory.

Long Block - Can vary, but it's usually the whole engine, but without all the other bits like alternator
Short Block - Just the block, pistons, crank etc... but not the heads up
Downpipe - The part of the exhaust that attaches to the turbo "exit"
Uppipe - The part of the exhaust that attaches to the turbo "inlet"
NVH - Noise, Vibration, Harmonics. Basically all the stuff you dont get in a bentley.
Offset - In a nutshell, a lower offset means more distance from the wheel/hub mating surface to the outer edge of the wheels.
 
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