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

Lu Ningping also guessed Zhang Yifei's psychology, so he said with a smile: "Yifei, the feeling of getting started in competitive karting is different from driving, why don't you start practicing with 100CC?" ”

"No, that's it."

Zhang Yifei insisted on driving a 150CC, and Uncle Lu looked down on people too much, so he really put himself with children under the age of ten.

"Alright then, go get your protective gear on."

Lu Ningping pointed to a corner, where there were helmets, gloves, racing suits and other professional protective gear. It's just that these racing suits are children's versions, and Zhang Yifei probably can't wear them, so he just put on his helmet and gloves, and then sat on the 150CC competitive kart.

"This is a four-stroke high-revving engine, divided by international specifications into the KZ group, with a six-speed gearbox, commonly known as a gearbox. The top speed is 130km/h, the EFI engine system, the 1:1 steering ratio, and some other small differences, which you can slowly experience for yourself. ”

"I see, Uncle Lu."

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

"Competitive karting uses all-melt tires, so let's warm up the tires before running laps." Lu Ningping instructed.

There are many types of tires in automobiles, such as run-flat tires, snow tires, off-road tires, and so on. However, when used in competitions, unless it is a special weather such as rain and snow, only semi-hot melt or full hot melt tires are generally used.

Full hot melt tires are mostly used in track races or formula cars, which are commonly known as "slick tires", because the surface of the tire is without any pattern, and the friction with the ground heats up in the driving state, the surface of the tire will melt at high temperature and become a gel state, and the adhesion between the softened tire and the ground will be enhanced, thereby improving the cornering limit of the vehicle.

The same full hot melt tires also have great defects, one is because there is no pattern on the surface of the tire, so that the drainage is almost equal to zero, once there is water in the field, it not only does not enhance the grip, but is easier to slip.

In addition, the all-hot melt tires are very wear-resistant, such as watching Formula 1 races, you can often see the car entering the pit to change the tires, because the tires are worn too much. Moreover, the price of full hot melt tires is still very expensive, such as F1, which is at least tens of thousands, and the cost of changing tires alone is hundreds of thousands after a race, so formula racing is really a money-burning game.

Semi-hot melt tires are simply a mediocre product, which has the advantages of full hot melt tires, but also avoids the disadvantages of poor drainage and high cost. However, the advantages are not as strong as those of full hot melt, and the disadvantages are not so obvious, and the overall cost performance is higher, so the average street rider chooses semi-hot melt tires.

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

Zhang Yifei knew these things very well, so he didn't run the full throttle lap as soon as he came up, but circled at a normal speed after ignition, and warmed up the tires while getting familiar with the track. This is also a scene often seen in many professional races, where the pre-race guide car leads the way in the front, and many cars follow the hot tires around the field to familiarize themselves with the track.

Zhang Yifei, who was driving a go-kart, to be honest, didn't feel like driving at this moment, but more like fiddling with a big toy. After all, for a professional driver, even if you have not been exposed to these things, it is not difficult to get started.

Technically, there are not many problems, but more about the differences in adaptation and feeling, such as the 1:1 steering ratio, no cockpit, and no vehicle roll when cornering, but the swing of the whole body. But soon, Zhang Yifei adapted to these changes, and the speed of the kart began to increase.

From 30-40km/h at the beginning of the hot tires to 60-70km/h at the back, the process is not as difficult as Zhang Yifei imagined before, and it may also have something to do with the model. Even a 150CC modified KZ-class kart has a big speed gap with a real formula car, and it can only be regarded as the "cradle" level of F1 cars.

After adapting, Zhang Yifei began to pursue lap times, go-karts or formula cars, unlike street racing, there is no so-called drift at all. Because for the speed of a formula car, once the tires lose their grip, it is very likely that the calf will be destroyed. Therefore, formula racers will look for the best cornering route, and use the method of cutting the center point of the corner, preferably without slowing down and driving at full throttle.

Every lap of the track is meticulously calculated for the formula drivers, and at the same time as clock-like precision, with the wheels being measured in centimeters from the edge of the corner. There is a famous story in this, a generation of car god Senna hit the barrier while cornering, but after the race he was very unconvinced, thinking that it was not his driving mistake that hit the barrier, but the wall hit him!

If this kind of thing is changed to any person, it is simply a fantasy, you can still throw the pot to the wall when you drive into the wall, what kind of joke is this, and you have to be shameless? But this sentence was said by the car god Senna, so the race team went to find out the cause of the accident, and after measurement, it was really a centimeter off the fence, because a driver had hit it a few laps ago, so the position was about a centimeter lower than the beginning.

That's right, every lap of the car god Senna's cornering course, the error is within this small centimeter, when he continues the previous lap of the cornering route, because the fence has produced a slight displacement, causing him to crash up, this is the strongest F1 driver can be called a terrifying driving skill, it is just like the god of heaven and the general metamorphosis, so it is not for nothing that he is called the car god.

Zhang Yifei ran three or four laps at an average speed of 60-70km/h, and gradually became familiar with the track, and at the same time, the oil and tire temperature of the go-kart also went up, entering the best mechanical environment. At this time, Zhang Yifei increased his speed again, and pursued the best route for every corner, such as finding the tangent of the corner, which is not a difficult thing for a professional driver.

On the other hand, Lu Ningping also felt the change in Zhang Yifei's speed, he understood that this kid was going to run seriously, so he took out a stopwatch and began to time Zhang Yifei's lap time, wanting to see Zhang Yifei's first time running a kart track, where his limit would be, and whether it would be as surprising as the original mountain road.

The go-kart engine makes a violent roar, and the speed has been maintained at a state of breaking 10,000, which is the difference between the high-speed racing engine and the ordinary engine, the general engine enters the red zone after 6,000 rpm, while the flashpoint of the high-speed engine is more than 10,000 rpm, and it has more surging power under the same displacement base.

Zhang Yifei's straight-line speed at the moment is close to the speed limit of this go-kart, even if it is the corner speed, as long as it is not a continuous compound corner, it is also maintained at 80-90km/h, if nothing else, it is very likely to break the lap record of the kart club.