How Common Is It for Cars to Be Hit by Stones on the Highway?

What is the actual speed when the car speedometer shows 100?

When the dashboard displays a speed of 100 kilometers per hour, the actual speed may be approximately 97 kilometers per hour. The so-called positive error means that the measured value is never less than the actual value, that is, the speedometer reading can be equal to or greater than the actual value, but it must never be less than the actual value. Here is some additional information: Speedometer principle: The speedometer signal comes from a sensor. In some manual transmission vehicles, the speed sensor is located on the output shaft of the transmission, while in automatic transmission vehicles, the speed sensor comes from the wheel speed sensor of the ABS system. The sensor can measure the rotational frequency of the object being measured. For example, the wheel speed sensor can measure the rotational frequency of the wheel, and then the wheel speed can be calculated based on hardware parameters and time. Knowing the speed and combining it with the wheel diameter allows the vehicle speed to be calculated.

6

4

Share

What are the symptoms of a BMW fuel pump failure?

BMW high-pressure fuel pump failure symptoms include severe car shaking, lack of acceleration power, unstable idling, difficulty starting, and even stalling. Both the fuel pump and high-pressure fuel pump may fail, though the probability is relatively low. Here is relevant information: 1. Hazards: A damaged fuel pump in the fuel tank is a serious malfunction that directly affects vehicle power and may even cause complete breakdown or failure to start. While high-pressure fuel pump failure won't necessarily strand the vehicle, it can cause weak acceleration and strong jerking sensations during driving. 2. Precautions: The high-pressure fuel pump is purely mechanically driven (by camshaft), with potential failures including mechanical damage, clogging, or oil leakage. For direct injection engines, fuel pump and high-pressure fuel pump failures share similar symptoms. If experiencing weak acceleration or shaking, step-by-step diagnosis is recommended. This applies to both the fuel pump and high-pressure fuel pump.

8

5

Share

What are the requirements for installing an electric vehicle charging station?

Installing a charging station requires meeting the following conditions: 1. Confirm charging conditions: This is the most basic requirement. If installation is not permitted, other considerations become irrelevant. First, determine whether there is a fixed parking space in the residential area, and then check if the parking space can be connected to the State Grid's power lines. 2. Property management: Approval and cooperation from the property management are required. To install a charging station, it is essential to obtain permission from the property management. This mainly depends on the communication between the homeowner and the property management. Once the property management agrees and the installation conditions are met, you can apply at the local power supply office of the residential area. 3. Power supply company: After the charging station construction is completed, you can submit an acceptance application to the power supply company. Upon passing the acceptance inspection, the power supply company will complete the meter installation and power connection, after which charging can naturally begin.

1

2

Share

Is seat ventilation air-conditioned air or natural air?

Seat ventilation blows out natural air, which is not air from the air conditioning system. More related information is as follows: 1. Ventilated seats: Ventilated seats are a common feature among the increasingly diverse car configurations, along with additions like power-folding mirrors, front fog light switches, and reverse radar switches. Other common aftermarket installations include xenon lights and large central control screens. 2. Seat ventilation function: Although seat ventilation modifications might seem unnecessary, they significantly enhance comfort. Seat ventilation helps keep the buttocks and back dry. Whether it's blowing or sucking air, the goal is to make the seat cushion and backrest more breathable, greatly improving driving comfort, especially during long drives where the benefits are most noticeable.

12

3

Share

Where Has Zhengzhou's Largest Motorcycle Market Moved To?

Zhengzhou Motorcycle City Wholesale Market has a 20-year history. To facilitate traffic, it required land expansion for road widening. As the main artery for motorcycle sales across Henan province, Zhengzhou Motorcycle City is frequently visited by many loyal customers. Therefore, the new location is just one road away from the original site. The new address is located downstairs at Meilin Riverside, the intersection of Hanghai Road and Zhongzhou Avenue (south of Tongshengxiang Restaurant), where nearly 200 wholesalers and about 300 brands are gathered. For motorcycle registration, the following documents are required: 1. Identity proof: The identity document of the vehicle owner. 2. Proof of origin: Purchase invoice or other proof of the vehicle's origin. 3. Import certificate: The vehicle's factory qualification certificate or import documentation for imported motorcycles. 4. Tax exemption certificate: Proof of payment of vehicle purchase tax or tax exemption certificate. 5. Compulsory insurance certificate: Proof of compulsory traffic accident liability insurance for motor vehicles.

5

Share

What Octane Gasoline Should the Volkswagen Talagon Use?

The Volkswagen Talagon with a 2.0T four-cylinder engine requires 98 octane gasoline, while the six-cylinder version can use 95 octane gasoline. These octane ratings are recommended in the vehicle's official user manual. In addition to checking the appropriate gasoline octane in the user manual, you can also find it indicated on the fuel tank cap. Typically, the required octane can also be determined based on the engine's compression ratio. Vehicles with a compression ratio between 8.6-9.9 should use 92 octane gasoline, those between 10.0-11.5 should use 95 octane, and higher compression ratios require 98 octane. However, with the use of new technologies, the compression ratio alone may not determine the required octane, as high compression ratios can sometimes be tuned to use lower octane gasoline. Other factors, such as ignition timing, turbocharging technology, and Atkinson cycle technology, also play a role. Generally, higher octane gasoline has a higher octane rating and better anti-knock properties. For example, 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 95% isooctane and 5% n-heptane. If the Talagon occasionally uses the wrong octane gasoline, simply switching back to the correct octane after use is sufficient. However, prolonged use of the wrong octane can have the following effects: Using higher octane gasoline in a vehicle designed for lower octane will not cause damage, but the increased octane can alter the fuel's ignition point, leading to delayed combustion. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. Using lower octane gasoline in a vehicle designed for higher octane can cause engine knocking. The lower octane reduces the fuel's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance builds up during the upward stroke. This resistance makes the engine run very unevenly. Mild knocking may only increase noise without significant engine damage, but severe knocking indicates serious engine issues, affecting driving stability and causing abnormal wear on pistons and cylinders, potentially leading to cylinder scoring.

13

5

Share

How Common Is It for Cars to Be Hit by Stones on the Highway?

What is the actual speed when the car speedometer shows 100?

What are the symptoms of a BMW fuel pump failure?

What are the requirements for installing an electric vehicle charging station?

Is seat ventilation air-conditioned air or natural air?

Where Has Zhengzhou's Largest Motorcycle Market Moved To?

What Octane Gasoline Should the Volkswagen Talagon Use?

What Are the Effects of High-Viscosity Engine Oil on a Car?

What Causes Inner Tire Wear on Rear Wheels?

What to Do About Toyota Engine Immobilizer System?

What Causes the Failure of Car Window Glass to Roll Up and Down?