Super Car Sales System

Chapter 253 Standard Tire Pressure
Chapter 170: Standard tire pressure
Song Guoyuan slid his finger across the surface of the tire and said, "If the tire pressure is too high or too low, it will increase fuel consumption. It is best to adjust it to the standard tire pressure specified by the manufacturer..."

"Will the tire pressure be too high or too low to increase the fuel consumption?" Song Guoyuan hadn't finished speaking, which had aroused Wang Hu and others' doubts.

Everyone has heard before that some 4S stores even suggest that car owners take the initiative to lower the tire pressure, saying that this will save fuel.

Wang Hu raised a question based on his own experience: "I heard that the tire pressure should be lowered, especially in summer, because the weather is too hot and the tire pressure should be kept lower."

Xu Hong hesitated for a moment before expressing his opinion: "I remember that some car owners would even take the initiative to deflate the tires and lower the tire pressure in order to make their cars look low and beautiful."

Liu Liang paid more attention to racing cars. He heard that some cars filled the tires with nitrogen, and wanted to ask Song Guoyuan if it would be beneficial to do so.

……

The five people asked questions one after another, almost obliterating Song Guoyuan, and this master in the auto repair industry couldn't stand it anymore.

Fangyuan has a car dealership system, so he knew what Master said was right, so he waved his hand to tell everyone to stop talking: "Standard tire pressure, since it is called standard tire pressure, it is the correct tire pressure that needs to be maintained by the car owner during use. , It is obtained by various OEMs based on countless experiments and painstaking experiments, and it is not allowed to increase or decrease at will. If everyone is so willful, there is no need to formulate standard tire pressure.”

Fang Yuan's words were a bit heavy, because there was a surge of anger in his heart.

It's not that Fang Yuan hates Wang Hu and others for having too many questions, or that he's angry at his colleagues. He really hates the fact that the Internet is full of hard-to-distinguish popular science knowledge, which disrupts everyone's cognition.

Take this tire pressure as an example, a random search on the Internet reveals a lot of contradictory and diametrically opposed arguments. Many articles say the same thing, but the result is completely opposite, bewitching car owners to do this and that.

These people sell methods that have not been proven and tested. What if something goes wrong?
Since these people are so good, why do they need so many engineers from OEMs?
Since these people boast that they are extremely correct, why do OEMs spend so much time and money setting up standard tire pressures?
Fang Yuan was even thinking, since these people are so smart, OEMs don't need to spend billions or billions to develop new cars, just find these people, touch the upper lip to the lower lip, and the accurate data will come out , but the first car built asked them to test drive it.

Fang Yuan, who rescued the master, looked a bit unkind. Coupled with his prestige among his colleagues and his status in the car dealership, the chaotic crowd thought that their leader was angry, so they shut up immediately and listened to Song Guoyuan honestly. Go on.

"Don't worry, I'll answer you one by one." At this moment, Song Guoyuan was very patient, pointed again to the place where the tires and the ground contact, and explained to everyone seriously, "As I said just now, if the tire pressure is too low, the tires and the ground will touch each other. The contact area of ​​the ground will increase..."

Everyone nodded, expressing their approval of Song Guoyuan's current statement, because the facts are in front of them, the tire pressure of the current Audi A4allroad is on the low side, as Song Guoyuan said, the contact area between the tire and the ground has become larger.

Song Guoyuan gestured the distance from the ground to the edge of the wheel hub: "If the tire pressure is too low, the friction between the tire surface and the ground will increase, and the carcass material will be broken and cracked, and the damaged tire cannot bear the total load of the vehicle. Shortened tire life and fuel consumption are inevitable, and serious damage to the wheel hub and tire blowout will result.”

What Song Guoyuan said was reasonable, and there were real objects in front of him as on-site teaching tools. Everyone was very convinced and gradually realized their mistakes.

"Injecting nitrogen into tires is not so magical, at least it has basically no effect on tire pressure and tire temperature stability during driving..." Song Guoyuan deliberately emphasized after explaining Liu Liang's question that the standard tire pressure recommended by various OEMs is not Similarly, for example, the standard tire pressure suggested by Chevrolet Malibu is 2.4bar, while the standard tire pressure suggested by Harvard H6 is 2.1bar.

Moreover, the standard tire pressure refers to the tire pressure when the car is cold, not the tire pressure displayed during the driving of the car.

According to the performance of their own models, some OEMs even mark the tire pressures for light loads and full loads. Which one to choose as the standard tire pressure at this time depends on whether your car is lightly loaded or fully loaded. , Whichever situation is more, take whichever is the standard tire pressure.

In addition, some models consider that the front half of the front-wheel drive model is heavier, which will cause greater pressure on the front tires, so it is carefully suggested that the tire pressure of the front tires should be higher than that of the rear tires.

Of course, if your car does not have the front and rear tire pressure marked, then it will be the same by default, so don't make the front high and the rear low.

As soon as Song Guoyuan's words fell to the ground, Liu Liang asked again: "How can I know what the standard tire pressure of my car is?"

Song Guoyuan was getting old, and he seemed a little tired after talking for a long time. Fang Yuan was a little worried about Master's body, so he explained to Liu Liang first: "Generally, it will be marked on the inside of the fuel tank cap, or check the B-pillar of the co-pilot."

Liu Liang and the others didn't have a car, and they didn't pay attention to such details. Now that Fang Yuan said this, Liu Liang and the others suddenly understood.

Liu Liang and the others also noticed Song Guoyuan's tired expression, and asked Fang Yuan: "Master Song just said about ordinary tires, what about the run-flat tires like BMW and Mini? Are they also inflated according to the standard tire pressure?"

"Of course." Fang Yuan told Liu Liang that it also depends on the standard tire pressure written on the car's nameplate or fuel tank cap.

"Other models have spare tires. BMW and mini are run-flat tires, so you don't need a spare tire at all." Liu Liang said enviously that he would like to buy a BMW in the future.

"Brother Liu, you are wrong to think that way." From Fang Yuan's point of view, Liu Liang's idea is very dangerous. Run-flat tires are stronger than ordinary tires. Kilometers or so, enough to persist until you find an auto repair shop, and many ordinary tires can do this now.

People design this run-flat tire not to allow the car to continue driving after a problem occurs, but mainly to prevent the car from losing control when the tire suddenly loses pressure, so that the car can be driven to the nearest place where it can be inflated for maintenance in time.

The shorter the time, the better. If you work with illness for a long time, tires, wheels, ball joints, lower swing arms and other components are also very easy to be scrapped.

And the run-flat tires are not so strong that they are fearless. BMW's run-flat tires are afraid of bumps on curbs and ditches, otherwise they are prone to failure.

"Oh, so that's how it is. I thought I could go on a rampage with run-flat tires." Liu Liang blushed with embarrassment, and then realized that run-flat tires are not a panacea.

"BMW and mini don't have spare tires, and now some models are not equipped with spare tires." Fang Yuan recalled a message in the car dealer's system and told Liu Liang and others that after some car owners bought their cars home, the first One thing is to remove the spare tire fixed in the trunk or on the chassis, because this reduces weight and saves fuel.

The practice of these car owners has inspired some OEMs. Although they are not equipped with run-flat tires, they have prepared some tire repair tools to replace spare tires.

This approach saves space in the trunk and fuel consumption, but it also has disadvantages. In short, there are advantages and disadvantages. Fang Yuan didn't comment much.

……

After finishing the visual inspection, Song Guoyuan asked Liu Liang to open the hood again, and began to check the engine, coolant, water tank and other places.

Song Guoyuan inspected these places very quickly. He took a general look at the working conditions of the engine and made sure that there was no vibration or severe abnormal noise. Then he transferred to other places such as the oil circuit. The car is so comprehensive when it is appraised.

"Because most of the vehicle condition appraisal is checked by professionals, the inspection before the trip is checked by the car owner himself, and most of the car owners do not have sufficient auto repair skills. , abnormal noise, leakage, etc. can be clearly seen and heard clearly.” After Fang Yuan stood by and explained to everyone, Liu Liang and the others thought it was right, they did not have the skills of auto repair. It’s useless to do it. If you break it with your hands, it will be a bad thing. It’s better to just do a preliminary inspection. If you feel uneasy, go to a professional auto repair shop or 4S shop.

Liu Liang and the others now know the difference between the vehicle condition appraisal and the temporary inspection. This time, they stopped making a fuss. After Sun Yanming sat in the car and checked the engine oil pressure, brake system, steering gear, etc., there were no faults, and finally confirmed that this car The Audi A4allroad is in peak condition, just need some pressure.

Song Guoyuan just did a very simple inspection, and it took nearly an hour of busy work, and he was sweating profusely. Liu Liang and others were envious, and felt that Song Guoyuan was so kind to him.

Fang Yuan has a car dealer system, and it only takes a few seconds to get the same result that Song Guoyuan spent an hour getting, but he is also very grateful to Song Guoyuan.

After explaining the simple inspection to everyone, Song Guoyuan began to ignore everyone, and directed Liu Liang to put the car on the lift, and began to do more detailed inspections alone.

The people gathered around dispersed, and they continued to do what they should be busy with.

Liu Liang leaned in front of Fang Yuan and said enviously, "Master Song is so kind to you."

Fang Yuan smiled, he heard from Sun Yanming that his master used to have a very weird temper, but after such a long time of contact, he realized that it was not the case at all.

Song Guoyuan's face is cold and warm-hearted, especially he pays attention to professional ethics and refuses to do things that violate professional ethics. Fang Yuan respects him very much in this regard.

　Today I went to the hospital to get a bottle, and I was free to search for my own book. I saw a reader leave a message on a channel, and I seem to like this book very much.

　　I also happen to have an account, so I immediately ordered a five-star review for my book and sent a long review. Isn’t this counting as Wang Po selling melons and boasting?

　　
　
(End of this chapter)