BoostinPower
03-13-2009, 08:15 PM
This info is off of dsmtuners.
1g Refers to the first generation DSM that was built between 1990 and 1994.
2g Refers to the second generation DSM that was built between 1995 and 1999.
ABS - Anti-lock Braking System A computer-controlled system that can "sense", in a braking situation, when one or more wheels have stopped turning, yet the vehicle is still moving. The computer will then quickly release and re-apply the brakes repeatedly, thus giving the driver more control of the vehicle.
AWS - All Wheel Steering A system that actively turns the rear wheels (usually no where nearly as much as the front wheels) in the same direction as the front wheels to aid in high-speed cornering and to improve the overall "feel" of the car. The Mitsubishi Galant VR-4 and 3000GT VR-4(Stealth R/T) have AWS systems.
CAS - Crank Angle Sensor The positional sensor on a 1G that informs the ECU what the crank and cam shaft position is for timing the ignition and injection events. There are three different types of CAS on the various 1Gs. The 90 model used optical sensors and had a pigtail to connect to the engine harness. The 91 to 93 "green top" CAS used optical sensing and an connector on the CAS body for the engine harness. The 94 cars used the "black top" CAS used hall effect sensors. See also: CKS, CPS.
DOHC - Dual Over-Head Camshaft The engine has two camshafts that are above the head. These engines do not have push rods, etc., that are typical of non OHC engines (e.g. typical chevy 350). Some DSM cars are equipped with a 2.0 L DOHC engine. Some people call it DOH "Cam", but if you think about it, there are two Cam *shafts*, each having many lobes (cams) - unless you have a 1-cylinder engine. See also: SOHC.
DSM - Diamond Star Motors A joint effort by Mitsubishi (three diamonds) and the Chrysler Corporation (penta-star) to build some of the most incredible automobiles in the world. The vehicles were produced with the names Eagle Talon, Mitsubishi Eclipse, and Plymouth Laser. DSM cars are assembled in Normal, Illinois. The '94-and-up Mitsubishi Galant is also assembled at the DSM plant in IL; previous Galant's were assembled in Japan. The Eclipse and Galant (since '89) share the same platform.
ECU - Engine Control Unit The computer that monitors and controls the various engine parameters.
EGT - Exhaust Gas Temperature Usually refers to a gauge that displays the temperature perceived by a sensor that is mounted on the outside of an exhaust manifold/header/etc.
EGR - Exhaust Gas Recirculator An emission-control system that directs some exhaust gases back into the intake manifold to reduce the formation of nitrous-oxide (NOx) pollutants. EGRs typically operate off manifold vacuum, and therefore only operate in the off-idle state up to WOT.
EVC - Electronic Valve Control This device is a basic closed-loop process controller. Its operation is very similar to an electronic cruise control device. You input a desired boost level, and it monitors the actual real time boost pressure. It then adjusts wastegate opening to maintain a stable boost pressure (supposedly) as engine load and RPM changes. Without a closed-loop control that incorporates an integral correction factor, boost pressure will always vary *somewhat* depending upon engine load and speed. The EVC isn't perfectly "tuned" for all possible engine/turbo configurations, and it is prone to under/over correction at times. The wastegate control is achieved by modulating a solenoid that regulates the amount of air that reaches (and thereby opens) the wastegate.
The control module in the cockpit has controls that allow you to set one of four different boost levels - Off, Low, High and Manual. The Manual control has an adjustable-as-you-drive control for boost levels. The Low and
High are small pots in the back of the control unit that you set once and leave.
FCD - Fuel-Cut Defencer In In Diamond Star applications, this comes with the PFC. In most cases, it appears that you can't buy it separately. The operating principle of the device is that of a frequency limiter. It is connected to the output of the Air-Mass sensor pin 2 on turbo TLE's - pin 1 on Galant VR-4's). The output frequency from the FCD tracks the input frequency until it reaches the limit setting... the output frequency then stays the same even if the input frequency (coming from the AMS) continues to increase. By fooling the ECU into believing that Mass Airflow never exceeds a predetermined amount, fuel cutoff is avoided. Unfortunately, fooling the ECU into believing the engine is consuming less air than it really is, results in a leaned-out mixture once limiting has begun. Because the turbo DSM's are set up to run quite rich on the top end, no harm is done expect possibly in extreme circumstances.
(NOTE: Other "hacks" have been discovered that will serve the same basic purpose: Removing the lower honeycomb section, enlarging the lower AMS inlet, and adding resistors/pots to the baro sensor and thermistor circuits
are all somewhat effective techniques.)
LSD - Limited-Slip Differential A special differential that limits the amount of slip (spinning) that will occur on a wheel that has no traction before the other wheel (with traction) begins to move. On the AWD DSMs, the LSD unit is a viscous coupler that will shift the torque to the wheel that has traction. Available only on the rear axle of AWD DSMs (was not available for Galant VR-4). None of the DSMs have front LSD units; they were determined to be unnecessary.
MAF/MAS - Mass-Air-flow Sensor The device used to measure volume of air being consumed by the engine. DSM cars use a specific type of sensor called a "Karman Vortex airflow sensor". The upper inlet of the sensor has an obstruction in the airflow path that generates a constant stream of vortices (think of them as miniature tornadoes) directly behind the obstruction. The velocity of the incoming airflow determines rate at which these vortices are spun off. By placing an ultrasonic speaker and microphone across the stream of vortices, their rate can be counted. (the vortices spin off in alternating directions and thereby produce a alternating FM shift of the received signal from the speaker) In addition to measuring incoming airflow velocity, the mass airflow sensor unit also measures air temperature and the local barometric pressure in order to provide the ECU all the data it needs to do a true determination of the MASS of the air that the engine is consuming.
NT or N/T Refers to the Non-Turbo version of the DSM. There were Non-Turbo 1g cars and 2g cars. The Non-Turbo 1g cars consisted of models that came with a 1.8L engine and a 2.0L 4G63 engine. The 2g Non-Turbo cars had a 420A Chrysler engine.
1g Refers to the first generation DSM that was built between 1990 and 1994.
2g Refers to the second generation DSM that was built between 1995 and 1999.
ABS - Anti-lock Braking System A computer-controlled system that can "sense", in a braking situation, when one or more wheels have stopped turning, yet the vehicle is still moving. The computer will then quickly release and re-apply the brakes repeatedly, thus giving the driver more control of the vehicle.
AWS - All Wheel Steering A system that actively turns the rear wheels (usually no where nearly as much as the front wheels) in the same direction as the front wheels to aid in high-speed cornering and to improve the overall "feel" of the car. The Mitsubishi Galant VR-4 and 3000GT VR-4(Stealth R/T) have AWS systems.
CAS - Crank Angle Sensor The positional sensor on a 1G that informs the ECU what the crank and cam shaft position is for timing the ignition and injection events. There are three different types of CAS on the various 1Gs. The 90 model used optical sensors and had a pigtail to connect to the engine harness. The 91 to 93 "green top" CAS used optical sensing and an connector on the CAS body for the engine harness. The 94 cars used the "black top" CAS used hall effect sensors. See also: CKS, CPS.
DOHC - Dual Over-Head Camshaft The engine has two camshafts that are above the head. These engines do not have push rods, etc., that are typical of non OHC engines (e.g. typical chevy 350). Some DSM cars are equipped with a 2.0 L DOHC engine. Some people call it DOH "Cam", but if you think about it, there are two Cam *shafts*, each having many lobes (cams) - unless you have a 1-cylinder engine. See also: SOHC.
DSM - Diamond Star Motors A joint effort by Mitsubishi (three diamonds) and the Chrysler Corporation (penta-star) to build some of the most incredible automobiles in the world. The vehicles were produced with the names Eagle Talon, Mitsubishi Eclipse, and Plymouth Laser. DSM cars are assembled in Normal, Illinois. The '94-and-up Mitsubishi Galant is also assembled at the DSM plant in IL; previous Galant's were assembled in Japan. The Eclipse and Galant (since '89) share the same platform.
ECU - Engine Control Unit The computer that monitors and controls the various engine parameters.
EGT - Exhaust Gas Temperature Usually refers to a gauge that displays the temperature perceived by a sensor that is mounted on the outside of an exhaust manifold/header/etc.
EGR - Exhaust Gas Recirculator An emission-control system that directs some exhaust gases back into the intake manifold to reduce the formation of nitrous-oxide (NOx) pollutants. EGRs typically operate off manifold vacuum, and therefore only operate in the off-idle state up to WOT.
EVC - Electronic Valve Control This device is a basic closed-loop process controller. Its operation is very similar to an electronic cruise control device. You input a desired boost level, and it monitors the actual real time boost pressure. It then adjusts wastegate opening to maintain a stable boost pressure (supposedly) as engine load and RPM changes. Without a closed-loop control that incorporates an integral correction factor, boost pressure will always vary *somewhat* depending upon engine load and speed. The EVC isn't perfectly "tuned" for all possible engine/turbo configurations, and it is prone to under/over correction at times. The wastegate control is achieved by modulating a solenoid that regulates the amount of air that reaches (and thereby opens) the wastegate.
The control module in the cockpit has controls that allow you to set one of four different boost levels - Off, Low, High and Manual. The Manual control has an adjustable-as-you-drive control for boost levels. The Low and
High are small pots in the back of the control unit that you set once and leave.
FCD - Fuel-Cut Defencer In In Diamond Star applications, this comes with the PFC. In most cases, it appears that you can't buy it separately. The operating principle of the device is that of a frequency limiter. It is connected to the output of the Air-Mass sensor pin 2 on turbo TLE's - pin 1 on Galant VR-4's). The output frequency from the FCD tracks the input frequency until it reaches the limit setting... the output frequency then stays the same even if the input frequency (coming from the AMS) continues to increase. By fooling the ECU into believing that Mass Airflow never exceeds a predetermined amount, fuel cutoff is avoided. Unfortunately, fooling the ECU into believing the engine is consuming less air than it really is, results in a leaned-out mixture once limiting has begun. Because the turbo DSM's are set up to run quite rich on the top end, no harm is done expect possibly in extreme circumstances.
(NOTE: Other "hacks" have been discovered that will serve the same basic purpose: Removing the lower honeycomb section, enlarging the lower AMS inlet, and adding resistors/pots to the baro sensor and thermistor circuits
are all somewhat effective techniques.)
LSD - Limited-Slip Differential A special differential that limits the amount of slip (spinning) that will occur on a wheel that has no traction before the other wheel (with traction) begins to move. On the AWD DSMs, the LSD unit is a viscous coupler that will shift the torque to the wheel that has traction. Available only on the rear axle of AWD DSMs (was not available for Galant VR-4). None of the DSMs have front LSD units; they were determined to be unnecessary.
MAF/MAS - Mass-Air-flow Sensor The device used to measure volume of air being consumed by the engine. DSM cars use a specific type of sensor called a "Karman Vortex airflow sensor". The upper inlet of the sensor has an obstruction in the airflow path that generates a constant stream of vortices (think of them as miniature tornadoes) directly behind the obstruction. The velocity of the incoming airflow determines rate at which these vortices are spun off. By placing an ultrasonic speaker and microphone across the stream of vortices, their rate can be counted. (the vortices spin off in alternating directions and thereby produce a alternating FM shift of the received signal from the speaker) In addition to measuring incoming airflow velocity, the mass airflow sensor unit also measures air temperature and the local barometric pressure in order to provide the ECU all the data it needs to do a true determination of the MASS of the air that the engine is consuming.
NT or N/T Refers to the Non-Turbo version of the DSM. There were Non-Turbo 1g cars and 2g cars. The Non-Turbo 1g cars consisted of models that came with a 1.8L engine and a 2.0L 4G63 engine. The 2g Non-Turbo cars had a 420A Chrysler engine.