Car Terms Explained: Turbo Petrol, ADAS, DCT, CVT, AWD & More

Buying a new car can become confusing when manufacturers use terms such as Turbo Petrol, ADAS, DCT, CVT, AWD, torque and regenerative braking. This guide explains the most common car terms in simple language so you can understand what they mean and why they matter.

Engine & Performance Terms

What Is Turbo Petrol?

A turbo petrol engine is a petrol engine equipped with a turbocharger. The turbocharger forces additional air into the engine, allowing it to produce more power and torque than a naturally aspirated engine of a similar size.

Turbo petrol engines are popular because they can provide strong acceleration while using a relatively small engine. They are particularly useful for highway driving and overtaking.

Term	Simple Meaning
Turbo Petrol	A petrol engine that uses a turbocharger to increase the amount of air entering the engine and improve power and torque.

What Is Torque?

Torque is the twisting force produced by an engine or electric motor. It is generally measured in Newton-metres (Nm).

In simple terms, torque helps a car pull strongly from a standstill, accelerate at lower speeds and handle loads such as passengers or luggage.

Term	Simple Meaning
Torque	The twisting force that helps a vehicle accelerate and move its load. It is usually measured in Nm.

What Is Horsepower?

Horsepower is a measure of an engine's power output. In India, car specifications commonly list power in PS as well as kW.

Generally, higher power can help a car achieve stronger acceleration and higher performance, although the actual driving experience also depends on weight, gearing, torque and other factors.

Term	Simple Meaning
Horsepower	A measurement of how much power an engine or motor can produce.

Transmission Terms

What Is DCT?

DCT stands for Dual-Clutch Transmission. It uses two separate clutches to manage different sets of gears.

One clutch can handle one group of gears while the other manages another group. This allows gear changes to happen quickly and can provide a sporty and responsive driving experience.

Term	Simple Meaning
DCT	Dual-Clutch Transmission. It uses two clutches to enable fast gear changes.

What Is AMT?

AMT stands for Automated Manual Transmission. It is essentially a manual gearbox in which the clutch operation and gear changes are controlled automatically.

AMTs are generally simpler than many conventional automatic systems and can be efficient and affordable. Gear changes can, however, feel more noticeable compared with smoother automatic transmissions.

Term	Simple Meaning
AMT	Automated Manual Transmission. A manual gearbox operated automatically without requiring the driver to use a clutch pedal.

What Is CVT?

CVT stands for Continuously Variable Transmission. Unlike a traditional automatic gearbox with fixed gear ratios, a CVT can continuously vary its effective ratio.

This allows the engine to operate in an efficient range and usually results in smooth acceleration without conventional gear changes.

Term	Simple Meaning
CVT	Continuously Variable Transmission. It continuously changes its transmission ratio instead of using fixed traditional gear steps.

What Is iMT?

iMT stands for Intelligent Manual Transmission. It is a manual gearbox that does not require the driver to operate a conventional clutch pedal.

The driver still selects the gears manually, while the system controls the clutch electronically.

Term	Simple Meaning
iMT	Intelligent Manual Transmission. The driver changes gears manually while the vehicle automatically operates the clutch.

What Is a Torque Converter?

A torque converter is a fluid-based device used in many automatic transmissions. It transfers engine power to the transmission while allowing the engine and gearbox to operate at different speeds.

It also allows the engine to keep running when the vehicle is stopped, such as at a traffic signal, without requiring a conventional clutch pedal.

Term	Simple Meaning
Torque Converter	A fluid coupling used in many automatic transmissions to transfer engine power smoothly to the gearbox.

Drive System Terms

What Is AWD?

AWD stands for All-Wheel Drive. An AWD system can send driving force to all four wheels when required, depending on the vehicle's design and operating conditions.

AWD can improve traction on slippery roads and provide additional stability in certain driving conditions. Different AWD systems operate in different ways, so AWD does not always mean that all four wheels are driven equally all the time.

Term	Simple Meaning
AWD	All-Wheel Drive. The system can deliver driving force to all four wheels to improve traction when needed.

What Is 4WD?

4WD stands for Four-Wheel Drive. It is commonly used in SUVs and off-road vehicles designed to handle difficult terrain.

Many 4WD systems provide selectable modes or low-range gearing for challenging conditions such as mud, sand, rocks and steep terrain.

AWD and 4WD are related but are not identical. The exact hardware and operating strategy depend on the vehicle.

Term	Simple Meaning
4WD	Four-Wheel Drive. A drivetrain system designed to provide drive to all four wheels, often with selectable modes for difficult terrain.

Car Size & Practicality Terms

What Is Ground Clearance?

Ground clearance is the distance between the lowest point underneath a vehicle and the ground.

Higher ground clearance can make it easier for a vehicle to pass over speed breakers, rough roads and uneven surfaces without the underside touching the ground.

Term	Simple Meaning
Ground Clearance	The vertical distance between the ground and the vehicle's lowest underside point.

What Is Wheelbase?

Wheelbase is the distance between the centre points of the front and rear wheels on the same side of a vehicle.

A longer wheelbase can create more cabin space and often contributes to better high-speed stability, although handling also depends on the vehicle's overall design.

Term	Simple Meaning
Wheelbase	The distance between the front and rear wheel centres. It is commonly measured in millimetres.

What Is Boot Space?

Boot space refers to the amount of luggage storage available in the rear cargo area of a car. It is commonly measured in litres.

A larger boot capacity generally means more room for luggage, although the actual usefulness of the space also depends on the boot's shape and loading area.

Term	Simple Meaning
Boot Space	The available luggage storage capacity in the car's rear cargo area, usually measured in litres.

What Is Kerb Weight?

Kerb weight is the weight of a vehicle in its normal ready-to-drive condition, including the standard equipment and operating fluids specified by the manufacturer, but generally excluding passengers and luggage.

A lighter vehicle can have advantages in areas such as acceleration, braking and efficiency, although vehicle engineering and powertrain characteristics are also important.

Term	Simple Meaning
Kerb Weight	The vehicle's ready-to-drive weight without passengers and luggage.

Hybrid & Electric Technology

What Is Hybrid Technology?

Hybrid technology combines two types of power sources, usually an internal combustion engine and one or more electric motors.

Depending on the type of hybrid system, the vehicle can use the engine, electric motor or both. The electric system can help improve efficiency and reduce fuel consumption, particularly in conditions where the electric motor can handle part or all of the propulsion.

Term	Simple Meaning
Hybrid Technology	A powertrain that combines an internal combustion engine with electric motor technology and a battery.

What Is Regenerative Braking?

Regenerative braking is a system used in hybrid and electric vehicles to recover some of the vehicle's kinetic energy during deceleration.

When the vehicle slows down, the electric motor can operate as a generator and convert part of that energy into electrical energy. The recovered energy can then be stored in the vehicle's battery.

Term	Simple Meaning
Regenerative Braking	A system that recovers some energy during deceleration and uses it to recharge the vehicle's battery.

Safety & Driver Assistance

What Is ADAS?

ADAS stands for Advanced Driver Assistance Systems. It is a collection of electronic systems designed to assist the driver and improve awareness and safety.

Depending on the vehicle, ADAS can include features such as automatic emergency braking, adaptive cruise control, lane departure warning, lane keeping assistance, blind-spot monitoring and other driver assistance functions.

ADAS is designed to assist the driver. It does not mean that the vehicle can safely drive itself in every situation.

Term	Simple Meaning
ADAS	Advanced Driver Assistance Systems. Technology that helps the driver with functions related to safety, awareness and driving assistance.

What Is ADAS Level 2?

Level 2 ADAS refers to a higher level of driving assistance where the vehicle can simultaneously assist with steering and acceleration or braking under supported conditions.

For example, a Level 2 system may combine adaptive cruise control with lane-centering assistance. The driver must still remain responsible for the vehicle, monitor the road and be ready to take control whenever required.

Level 2 does not make a car fully autonomous or driverless.

Term	Simple Meaning
ADAS Level 2	A driver-assistance level where the vehicle can provide steering and acceleration/braking assistance together, while the driver remains responsible and must continuously supervise the system.

Quick Car Terms Guide

Term	What It Means
Turbo Petrol	Petrol engine with a turbocharger for increased air intake and stronger performance.
ADAS	Advanced Driver Assistance Systems that help the driver with safety and driving tasks.
DCT	Dual-Clutch Transmission.
AMT	Automated Manual Transmission.
CVT	Continuously Variable Transmission.
iMT	Intelligent Manual Transmission.
Torque Converter	Fluid coupling used in many automatic transmissions.
AWD	All-Wheel Drive.
4WD	Four-Wheel Drive.
Ground Clearance	Distance between the ground and the vehicle's lowest underside point.
Wheelbase	Distance between the front and rear wheel centres.
Boot Space	Luggage storage capacity, generally measured in litres.
Torque	Twisting force produced by an engine or motor.
Horsepower	Measurement of engine or motor power.
Kerb Weight	Ready-to-drive weight of the vehicle without passengers and luggage.
Hybrid Technology	Combines an internal combustion engine with electric motor technology.
Regenerative Braking	Recovers some braking energy and stores it in the battery.
ADAS Level 2	Combined steering and acceleration/braking assistance with continuous driver supervision.

Frequently Asked Questions

What is the difference between horsepower and torque?

Torque is the twisting force produced by the engine or motor, while horsepower is a measurement of power output. Torque is especially important for pulling force and low-speed response, while power is important for overall performance.

Is DCT better than CVT?

Neither is universally better. DCTs generally offer quick gear changes and a more performance-oriented feel, while CVTs are designed around smooth acceleration and efficient operation. The better choice depends on your driving needs.

Is AMT a fully automatic transmission?

An AMT operates the clutch and gear changes automatically, so the driver does not need to use a clutch pedal. However, mechanically it is based on a manual transmission design.

Is iMT an automatic transmission?

iMT removes the need for a conventional clutch pedal, but the driver still selects the gears manually. It is therefore different from a conventional fully automatic transmission.

What is the difference between AWD and 4WD?

AWD systems generally manage power delivery to the wheels automatically according to driving conditions, while 4WD systems are commonly associated with selectable four-wheel-drive modes and off-road use. The exact operation varies by vehicle.

Does higher ground clearance mean a better car?

Not necessarily. Higher ground clearance can be useful on rough roads and speed breakers, but ride comfort, handling, stability and overall vehicle design are also important.

What is a good amount of boot space?

It depends on your needs. A larger boot is useful for families and frequent luggage use, but the shape and accessibility of the boot are also important.

Does Level 2 ADAS mean the car can drive itself?

No. Level 2 ADAS provides driving assistance but does not make the car fully autonomous. The driver must continuously monitor the road and remain responsible for driving.

What is regenerative braking in an electric car?

Regenerative braking allows the electric motor to recover some energy while the vehicle slows down. This energy can be stored in the battery for later use.

What is hybrid technology?

Hybrid technology combines an internal combustion engine with electric motor technology. Depending on the system, the vehicle can use the engine, electric motor or both to move the vehicle.