Zhang Yifei has never driven a 150cc kart, but he has ridden a motorcycle with this displacement in his previous life. Even a larger displacement motorcycle such as 250cc and 600cc. Zhang Yifei has also come into contact with it, so he is quite familiar with this kind of stroke engine and thinks that it is not a problem to control it.

Lu Ningping also guessed Zhang Yifei's mentality, so he smiled and said, "Yifei, it feels different to driving a competitive kart. Why don't you start practicing from 100cc?"

"No need, just this."

Zhang Yifei insisted on driving 150cc. Uncle Lu looked down on others so much that he really put himself in with children under ten years old.

"Okay, go and put all the protective gear."

Lu Ningping pointed to a corner where helmets, gloves, racing suits and other professional protective gears were all children's versions, and Zhang Yifei probably couldn't wear them anymore, so he just put his helmets on the gloves and got on the 150cc competitive kart.

"This is a four-stroke high-speed engine, divided into KZ groups by international specifications, and is paired with a six-speed gearbox, commonly known as a gear kart. The maximum speed is 130km/h, the electric injection engine system, a 1:1 steering ratio, and some other small differences, you can slowly experience it yourself."

"I understand, Uncle Lu."

Zhang Yifei nodded. These data are actually motorcycle data, which is not difficult for Zhang Yifei to understand.

"Competitive karts use fully hot-melt tires. Let's heat the tires before running the lap." Lu Ningping instructed.

There are many types of tires in cars, such as explosion-proof tires, snow tires, off-road tires, etc. However, when used in competitions, unless it is a special weather such as rain and snow, only semi-hot-melt or fully hot-melt tires will be used.

Most fully hot-melt tires are used in field racing or Formula racing, which is commonly known as "bald-headed tires". Because the surface of the tire has no patterns, when friction with the ground increases during driving, the tire surface will melt at high temperature and become gel-like. The softened tires and the ground are enhanced, thereby increasing the vehicle's cornering limit.

Also, fully hot-melt tires have great defects. First, because there is no pattern on the surface of the tire, the drainage is almost equal to zero. Once there is water on the site, it will not only not enhance the grip, but will instead slip more easily.

In addition, the fully hot-melt tires are very wear-resistant. For example, when watching F1 competitions, you can often see racing cars entering the repair station to change tires because the tires are worn too much. Moreover, the price of fully hot-melt tires is very expensive. For example, F1, one is at least tens of thousands, and the cost of changing tires alone is hundreds of thousands after a game, so Formula racing is really a money-burning game.

Semi-hot melting tires are simply a moderate product. They have the advantages of fully hot melting tires and avoid the disadvantages of poor drainage and high cost. However, their advantages are not as strong as full hot melting, and the disadvantages are not that obvious. In general, the cost performance is relatively high, so most street drivers choose semi-hot melting tires.

Whether it is full-heat-melt tires or semi-heat-melt tires, hot tires are needed before the official competition to allow the tire temperature to rise and have better grip. In Lu Ningping's eyes, Zhang Yifei is just a street driver and it is almost impossible to contact the fully-heat-melt tire models, so he reminded him.

Zhang Yifei knew these things very well, so he did not run the throttle lap as soon as he got up, but circled around at normal speed after ignition, familiarizing himself with the track and hot tires. This is also a scene that many professional competitions often see. Before the race, the event guides the car to lead the front, and many racing cars followed the hot tires to familiarize themselves with the track.

To be honest, Zhang Yifei, who was driving a kart, felt like he was driving at this moment, but more like he was fiddling with a big toy. After all, for a professional driver, even if he had never touched these things, it would not be difficult to get started.

There is not much technical problem, and it is more about adapting to the difference between feeling, such as the 1:1 steering ratio, no cockpit, no car rolling when turning, but the whole body swings. But soon, Zhang Yifei adapted to these changes, and the speed of the kart began to accelerate.

From 30-40km/h when the tires started, to gradual acceleration to 60-70km/h later, the process was not as difficult as Zhang Yifei imagined, and it may also have something to do with the model. Even if it is a 150cc modified kz-level kart, the speed difference between the real Formula racing car is very large, and it can only be regarded as the "cradle" level of the F1 racing car.

After adapting, Zhang Yifei began to pursue lap speeds. Karts or Formula racing are different from street racing, and there is no so-called drift at all. Because for the speed of Formula racing, once the tire loses grip, it is very likely to be over. Therefore, Formula racing drivers will find the best way to turn around, and use the method of cutting the center point of the curve, it is best not to slow down and drive over the full throttle without slowing down.

Every lap of the track is meticulous for the Formula drivers, and it is also as accurate as the clock. The wheels are calculated in centimeters from the edge of the curve. There is a famous story here. The generation of car god Senna hit the isolation barrier while turning, but after the race, he was very dissatisfied and believed that it was not his driving mistake that hit the isolation barrier, but the wall hit him!

If anyone else was going to do this kind of thing, it would be a fantasy. If you hit a wall by a car, you can even throw the blame to the wall. What a joke, it would be shameless? But this sentence was said by the car god Senna, so the racer went to explore the cause of the accident. After measurement, the isolation barrier was really shifted by one centimeter. Because a driver hit it a few laps before, the position moved about one centimeter than the beginning.

That's right, the error of the car god Senna every lap is within a small centimeter. When he continues to make a bend in the next lap, he bumps into it because the isolation barrier has some displacement. This is the terrifying driving skill of the strongest F1 driver. It's like a god descending to earth, so it's not without a reason to be called a car god.

Zhang Yifei ran three or four laps with an average speed of 60-70km/h, and he gradually became familiar with the track. At the same time, the kart oil and tire temperature also increased, entering the best mechanical environment. At this time, Zhang Yifei increased the speed again and pursued the best route for every corner. Operations such as finding the tangent line of the cornering center are not difficult for a professional driver.

On the other hand, Lu Ningping also felt the change in Zhang Yifei's speed. He understood that the boy was planning to run seriously, so he took out his stopwatch to start time Zhang Yifei's lap meter, wanting to see where his limit would be, and whether it would be as surprising as the mountain road at the beginning.

The kart engine roared violently, and its speed had remained at a state of over 10,000 yuan. This is the difference between a high-speed race engine and an ordinary engine. Generally, the engine enters the red zone after 6,000 yuan, while the explosion point of the high-speed engine is more than 10,000 yuan. Under the same displacement basis, it has more powerful power.
Chapter completed!