Zhang Yifei's tone and expression were very calm, but when Junko Takeda saw the Renault car less than half a meter away from the wall, she understood how thrilling it was just now.

So she turned to Yamamoto Ukyo and asked, "Didn't you change to neutral tires this time, it stands to reason that tires are harder and less prone to punctures, why is this happening?" ”

"I don't know, is there something debris on the track that was crushed by Yifeijun?"

Yamamoto Ukyo thought of this possibility, and then came to the side of the racing car, and the general civilian car puncture, as long as it is not hard to drive dozens of kilometers, basically the outer tire and the inner tube or something, there is a complete appearance is different.

Formula car tires are metal mesh without an inner layer, and once the tire is punctured at high speed, it will be torn into pieces in an instant, leaving only one wheel to hang on the car.

Therefore, Yamamoto Ukyo could not find any traces of a puncture, and no other debris was found on the track except for the rubber sheets left over from the puncture.

"It's just a flat tire, don't be so nervous, find a way to change the tire and get the car back to the pits first."

"Okay, I'll go back with Brother Zhi and push the tire rack over."

Ah Hu immediately responded, and then returned to the pit with Chen Zhi, ready to bring the tools and spare tires.

In fact, in a formula car, even if it is a flat tire, it is okay to drive it back.

For example, if the F1 track has a tire burst in the middle of the race, and it is still on the track without causing a loss of control, there is a distance from the pit stop, and many drivers are gritting their teeth at this time to drive the car hard, and it is a big deal to change the wheel, which is much better than retiring.

But the problem is that this hub is converted into RMB, and it will cost tens of thousands! Moreover, the accident that occurred during the test run was not within the scope of Toyota's sponsorship, which means that Zhang Yifei needed to pay the money himself.

Although the race didn't cost much during this time, the hotel expenses of the group, the cost of renting a car, and the loss of the car during the test run, Zhang Yifei also spent 100,000 yuan, and the price was really not low.

According to Zhang Yifei's estimate, the Renault 2000 European Cup is completed in the whole process, even if it goes well, there will be millions of expenditures by visual inspection, which is really not a small amount of money.

So this kind of cost of scrapping a wheel hub at will, Zhang Yifei is distressed and reluctant to spend this money.

Yamamoto Ukyo was still crouching next to the car, checking the condition of the other tires to find out the cause of the puncture.

The supplier of F1 racing tires in this era is Bridgestone, a Fortune 500 company in Japan and one of the three giants of tires in the world.

Although the brand of Formula Renault did not specify the tire manufacturer, Toyota is also a Japanese company, and because of the convenience of supply, it still chose Bridgestone tires.

Moreover, Bridgestone has a good reputation on the F1 track in the past two years, and there are no major flaws. It stands to reason that today's test run is a new tire, and it is still a neutral tire, and there should be no puncture accident.

So Yamamoto Ukyo was worried that it had nothing to do with the tires, but the problem with the car itself, and if that was the case, even if the tires were changed, there would still be a risk of a puncture on the track, and he had to find out the problem.

Zhang Yifei is just a driver, not a maintenance technician, ordinary vehicles change tire parts or something, he can still take a handle, the professionalism of formula racing has exceeded the scope of his knowledge, so he can only stand on the sidelines and watch.

He Ziling took out a kettle from the backpack behind him at this time, handed it to Zhang Yifei and said, "Look at your sweaty appearance, drink saliva." ”

Hearing this, Zhang Yifei looked at He Ziling beside her, because she was running, her face was also red at the moment, and there were beads of sweat on her forehead and the tip of her nose.

"Drink, I'm not thirsty."

Zhang Yifei was more scared into a cold sweat before, rather than thirsty.

"It should have been dangerous just now, you...... You stay safe in the future. ”

He Ziling muttered in a low voice, when she ran to the scene just now, she always wanted to ask about Zhang Yifei's situation, but there were too many people, and she couldn't interject.

She had experienced a track accident with He Lang before, and knew what the consequences of an accident would be with the exaggerated speed of a car. So when she heard Junko Takeda say something happened before, she was also nervous.

But because of the current status of the two of them as classmates and reluctant friends, He Ziling couldn't tell anything too much, so he could only whisper to remind Zhang Yifei to pay attention to safety.

Listening to He Ziling's instructions, Zhang Yifei smiled at the corner of his mouth, but did not answer.

The word safety, as if for racers, can be regarded as something to be abandoned.

Because once you pursue the speed limit, you are destined to have no chance of safety, and no driver dares to say that he can always race the track safely, as well as Senna, there will be times when he misses.

But even if you know that some moves are not safe, drivers will still choose to push the limits.

Just like Zhang Yifei almost crashed just now, in fact, he was also afraid of a cold sweat, but if he was allowed to run another lap, he would still choose not to step on the brakes to challenge the limit of cornering, which is the courage and courage that a professional driver should have.

Ah Hu and Chen Zhi moved quickly, and a cart with tires and removal tools on it was taken to the scene of the accident.

Yamamoto Ukyo checked the wheels and brake system of the car and found no problems, and it seems that this incident was indeed an accident.

"Change the tyres and then drive the car back to the pits, this time you need to check it to avoid any hidden dangers."

Junko Takeda conveyed the meaning of Yamamoto Ukyo, Ah Hu and Brother Zhi, holding a spare tire, and the three times five divided by two were replaced.

Anyway, they also learned from Toyota's technical team, and there is no big problem in changing tires, which is the most basic work in formula maintenance.

After changing the tyres, several people pushed the Renault from the gravel buffer onto the track and re-ignited it with an external power supply.

Zhang Yifei sat in the car again at this time, but he did not continue to test run, but slowly drove the car back to the pits. Generally, after an accident in a formula car, it must be thoroughly inspected to prevent damage to other parts.

At the San Marie Nomola circuit, where the car god Senna died unexpectedly, in fact, in addition to him, there was also an F1 driver named Larsenborg who died in the qualifying session the day before.

The site of the accident at Larsenborg was on the big straight in the stands of the Imola circuit, and officially because of the big straight, the speed of the car was very high, more than 300 km/h.

The higher the speed, the greater the wind resistance, in addition to such a high level of wind resistance, the front of the car suddenly fell off, causing the car to lose control and install the concrete wall.

Moreover, the F1 car at that time did not have Hans's neck protection system, and the violent impact caused Larsenborg to fracture the base of his skull and died of injuries. It can be seen that in the case of high speed in formula car, the detachment of any small part will cause unknowable serious consequences.

That's why a Formula 1 car, which requires up to 22 service technicians, is too delicate and too dangerous.

Zhang Yifei drove the car back to the pit, and Yamamoto Ukyo and a few people collected the large tire fragments on the track to avoid these debris from causing hidden dangers to other drivers.

After picking up a few pieces, Ukyo Yamamoto suddenly touched his hand to the ground, and then quickly took out an infrared thermometer from the tool bag he was carrying with him and measured the temperature of the ground.

Yamamoto Ukyo then ran towards the outside of the forest, aimed at the road surface in direct sunlight, and measured the number again.

After the comparison, Yamamoto Youkyo showed a sudden realization expression on his face, and then said to Junko Takeda, who came over: "Junko, I know the reason for the flat tire of Yifei-kun!" ”

"Temperature difference?"

Junko Takeda looked at Yamamoto Ukyo's movements, in fact, she had already roughly guessed the meaning behind it, but this situation is extremely rare, and it is rare to meet this condition.

"That's right, the temperature of the track floor exposed to direct sunlight is close to 60 °C, but the temperature of the tree-lined road is only about 30 °C, and the temperature difference between the two is nearly doubled!"

This is the most unique thing about the Hockenheimring Circuit, which has a tree-lined track with no direct sunlight and a very large temperature difference on the track.

Keep in mind that when the ground temperature is close to 60°C, the temperature of Renault racing tires can be as high as a staggering 130°C. If the road is always in the sun, there is no change in temperature, and there is not much risk of a puncture.

However, once you enter the tree-lined track, the huge ground temperature difference makes the tires unable to withstand this sudden change of cold and heat, and it is easy to get a puncture.

To be honest, without a wealth of engineer experience, this detailed change in ground temperature is very difficult to detect.

This is actually Yamamoto Ukyo's shortcoming, this is his first time as a temporary competition engineer, and there are indeed many deficiencies. If you are an experienced engineer, you may be the first to react.

The problem was found, but it was not easy to solve now, and the temperature change on the track was beyond their control. So after cleaning up the large tire fragments on the ground, several people returned to the pit first to discuss countermeasures.

In the pit station, Zhang Yifei had already changed out of the racing suit at this time, because of such an accident, there was definitely no way to test run today, and taking off the racing suit early can still breathe and cool down.

Seeing Yamamoto Youjing and a few people coming back, Zhang Yifei asked at this time: "Youjing, have you found the cause of the puncture?" ”

"I found it, the temperature difference on the track is the main cause of the puncture."

"Temperature differences?"

Zhang Yifei didn't understand it for a while, he was also inexperienced in these things, and he didn't know much about them.

"That's right, the temperature difference between the boulevard and the direct sunlight is nearly double, and the tires are prone to punctures when they suddenly experience this sudden change in cold and heat."

"So how to solve this problem?"

"There's basically no solution other than a change in the weather or a change in stiffer tires."

The track layout is fixed, and the tree-lined track is a feature of Hockenheim, and it is impossible to change this temperature difference unless the weather turns cloudy or rainy.

Another way to prevent punctures is to switch to stiffer tyres, but to be honest, medium tyres are already hard tyres for high-speed tracks like Hockenheim.

If you change to a stiffer tire, although the risk of puncture can be greatly reduced, the same grip will be greatly reduced, and the speed will be greatly affected.

This is a common choice for drivers, safety or speed?

The answer is obvious, as long as you have a champion heart, then the racer will definitely choose speed!