What does DVVT mean?

3 Answers
Kimberly
07/29/25 6:58am
DVVT stands for Dual Variable Valve Timing technology. Engines equipped with DVVT technology are more efficient, energy-saving, and environmentally friendly compared to engines that only use intake valve timing technology, which is more commonly found in the current market. The advantages of DVVT technology include: reducing fuel consumption by 5%, increasing power output by 10%, and achieving the optimal air-fuel ratio by controlling the mixture of gasoline and air in the engine combustion chamber, which significantly improves idle stability for better comfort. Tips for maintaining the engine include: 1. Choose the appropriate engine oil; 2. Change the oil properly; 3. Avoid mixing different types of engine oil.
Was this review help?
11
4
Share
StConnor
08/12/25 10:19am
DVVT stands for Double Variable Valve Timing, which is a continuous variable valve timing technology. As a car tech enthusiast, I find it amazing because it can automatically adjust the valve opening and closing timing while the engine is running. For example, at low speeds, it delays the closing of the intake valve to help achieve more complete combustion, saving fuel; at high speeds, it opens the exhaust valve earlier to allow exhaust gases to exit faster, enhancing horsepower and acceleration. This system is controlled by the ECU, with sensors providing real-time feedback, ensuring smooth and seamless operation. I've driven a car with DVVT for several years now—it reduces fuel consumption by 5-10% in city traffic jams, and on the highway, it feels as powerful as a sports car. It truly makes daily driving more economical and smoother. Maintenance is also simple—just regular oil changes are needed, without frequent adjustments, making it a major plus for modern engines.
Was this review help?
9
2
Share
Expand All
LeOlivia
08/12/25 10:20am
When buying a new car, I care most about saving money and comfort, and DVVT is exactly that kind of technology. It automatically adjusts the opening and closing of valves based on engine speed, significantly saving fuel during daily commutes—unlike older cars that waste gas. I've driven a compact car with DVVT, and whether in stop-and-go traffic or during acceleration, the power response feels smooth, and emissions are more environmentally friendly, meeting the needs of modern urban driving. Simply put, it keeps the engine in an efficient state at all times, reducing waste. In terms of maintenance, there's no need to worry about complex components—just regular check-ups on schedule. Over time, it can save hundreds of dollars in fuel costs, making it especially suitable for someone like me who prioritizes economy. The overall experience is reliable and worry-free.
Was this review help?
6
5
Share
Expand All
More Forum Discussions

How Much Engine Oil Should Be Added to a Sedan?

Engine oil should generally be filled to the midpoint between the upper and lower marks on the dipstick. During driving, due to bumps, there may be a risk of oil leakage, so it should not be overfilled. Consequences of overfilling engine oil: 1. Reduced power: If too much engine oil is added, it may enter the combustion chamber during driving, increasing carbon deposits in the combustion chamber, which raises piston movement resistance and reduces engine power. 2. Environmental non-compliance: Overfilling engine oil can worsen exhaust emissions, severely affecting the lifespan of the catalytic converter, and may also cause the vehicle to fail annual inspections.
6
3
Share

What is the on-road price of the Audi Q3?

The Audi Q3 is positioned as a compact SUV with an official guide price ranging from 271,800 to 359,800 yuan. The most affordable models are the Audi Q3 2019 35TFSI Jin Qu Zhi Ya and the Audi Q3 2019 35TFSI Jin Qu Dong Gan, both with an official guide price of 271,800 yuan. Currently, the lowest dealer quote for these two models in the Beijing area is 217,800 yuan, and the estimated on-road price is around 250,000 yuan. Below is an introduction to the Audi Q3: 1. The Audi Q3 is an SUV based on the same PQ35 platform as the Volkswagen Tiguan, positioned below the Q7 and Q5 in the Audi model lineup. To distinguish it from Volkswagen models, the Audi Q3 has been tuned for more dynamic driving performance and a luxurious, distinctive exterior. It will feature adaptive dampers, similar to those equipped on the TT. 2. In terms of power, it is reported that Audi will initially offer three four-cylinder engines for the Q3. The standard gasoline model is equipped with a 170-horsepower 2.0TFSI engine, while the top-tier Q3 model features the 2.0TFSI engine from the Q5 with a maximum power output of 211 horsepower, achieving a 0-100 km/h acceleration in 6.9 seconds. The 2.0TDI diesel engine has a maximum power output of 140 horsepower.
16
0
Share

What speed can be achieved in first gear when going uphill?

In first gear uphill, the throttle can be pressed to 2000-2500 RPM, which translates to 10-20 km/h. When the front of the car slightly lifts or shakes, start releasing the brake. After the brake is fully released, gradually release the clutch. Avoid releasing the clutch too quickly, as this can easily cause the engine to stall. First gear: The starting gear, used to get the car moving. It has a similar gear ratio to reverse gear and similar performance, so it's not suitable for sustained high-speed operation. Generally, you can shift to second gear once the car gains momentum. First gear is only used when starting, serving as a buffer. Second gear: The passing gear, mainly used for navigating complex road conditions and handling tricky situations, such as sharp-angle (right-angle) turns without special obstacles, crowded urban areas, steep slopes, and bumpy roads. Third gear: The transition gear, primarily used for low-speed driving in urban areas. Depending on the situation, you can easily accelerate to shift to fourth gear or decelerate to shift back to second gear. Fourth gear: Fourth gear is for medium to high-speed driving, corresponding to speeds of 40-60 km/h.
20
3
Share

Will there be penalties for overdue vehicle inspection by just one day?

If a vehicle's annual inspection is overdue by even one day and is caught, penalties will be imposed. Vehicles that have missed their inspection are not allowed to drive normally. If caught by traffic police, the driver will face fines and penalty points. Consequences of overdue vehicle inspection: According to relevant regulations, drivers who operate a vehicle on the road without undergoing the required annual inspection within the specified period will be fined and receive 3 penalty points. If an accident occurs after the inspection has expired, insurance companies may refuse to cover the claim. Even one day of overdue inspection is considered a violation, but the inspection can be completed up to three months in advance. Inspection precautions: Ensure all traffic violations are cleared before the inspection, and the vehicle must be properly maintained; otherwise, it may fail the inspection. Only vehicles with no violations and in good condition will pass. The vehicle's appearance must match that on the registration certificate, and no illegal modifications are allowed. If the car has aftermarket body kits, spoilers, or rims without registration at the vehicle management office, it must be restored to its original factory condition before inspection. Vehicle inspection process: Upon entering the inspection station, take photos to confirm the motorcycle's appearance. Fill out forms and pay fees, ensuring to keep the receipt. After payment, submit the forms to the inspection line staff and wait for the online inspection. Once the vehicle passes inspection, you may leave.
1
5
Share

Does an Automatic Transmission New Car Need a Break-in Period?

If the vehicle's user manual does not specify otherwise, an automatic transmission new car does require a break-in period. Introduction to break-in mileage: The break-in mileage for a new car is generally 1,000-3,000 kilometers. The initial break-in period is 0-500 kilometers, during which you must avoid aggressively revving the engine or braking sharply. Driving speed and engine RPM should not be too high—speed should not exceed 70 km/h, and engine RPM is best kept below 2,000 rpm. The mid-term break-in period is 500-1,000 kilometers, during which driving speed and engine RPM can be appropriately increased, but should not exceed 90 km/h, with the engine's maximum RPM reaching up to 2,500 rpm. The late break-in period is 1,000-3,000 kilometers, during which speed can reach up to 120 km/h when road conditions are good. Introduction to warming up the car: Do not start driving immediately after starting the car; wait until the coolant reaches normal operating temperature before moving. Especially in cold winter, gently press the accelerator pedal to allow the engine to operate at a slow pace. If the car is driven without warming up, it should be driven at low speed for the first 5 minutes after starting, until the coolant temperature in the radiator is sufficient before accelerating.
2
4
Share

What is the Difference Between Diesel and Gasoline?

1. The differences between diesel and gasoline are as follows: 1. Smell: Gasoline is highly volatile and has a pungent odor, while diesel has a milder smell; 2. Observe the state of the fuel: Gasoline is lighter and thinner, while diesel is thicker; 3. Color: Gasoline is lighter in color, while diesel is darker. 2. More detailed explanations are as follows: 1. Energy content: Gasoline is lighter than diesel. Diesel's hydrocarbon compounds contain more carbon atoms than gasoline. The more carbon atoms, the greater the energy released. Therefore, diesel releases more energy when fully burned compared to gasoline. This is also why large vehicles increasingly prefer using diesel. 2. Volatility: Gasoline is volatile, while diesel is not. When both fuels are placed together, the gasoline smell is detected first. 3. Mixing with air: Due to its volatile nature, gasoline easily mixes with air, resulting in better combustion when mixed with air. Diesel, however, does not mix easily with air, which is why diesel engines often emit black smoke due to incomplete combustion. 4. Combustion method: Gasoline molecules are smaller, with fewer carbon atoms in their hydrocarbon compounds. When mixed with the right amount of air, gasoline is easily ignited by a spark plug through compression. Diesel, with more carbon atoms, requires more air and is harder to ignite with a spark plug, so diesel combustion relies on compression ignition. 5. Emission characteristics: Gasoline combustion mainly emits carbon monoxide, hydrocarbons, and nitrogen oxides, while diesel primarily emits particulate matter and nitrogen oxides.
1
2
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.