When Miao Yutong once again stood on the track with the black and white checkered finish flag, the first locomotive that happened to be ahead of him was like an ice dancer, drawing a beautiful arc on the final corner, and then straightened the body and increased its horsepower to rush towards the finish line. She put her hands on a pergola to cover the dazzling sunlight above her head, and looked over there, the driver was wearing a red helmet and a black tight-fitting uniform, it was Cheng Xiaonan!

At this moment, Xiao Nan lay her entire upper body on the fuel tank of the 600CC verification car, relying on the front shroud to avoid the strong oncoming wind pressure, and the accelerator in her hand had been twisted to the end, and she wanted to pull out the limit speed of the car on the last 300 meters of straight runway.

Miao Yutong raised the finish flag in his hand high, waving it in the air at Xiao Nan, who was quickly approaching the finish line, at the same time, the other two locomotives had just entered the final corner, Xiong Mi and Qingran did not give up the race because of their big backwardness, but as if desperately, the body was tilted to the extreme angle, the exhaust pipe and the front pedal had a violent friction with the asphalt, and a string of sparks came out behind the body.

"The race is over!" Miao Yutong's hand waved the finish flag hard, Xiao Nan's 600CC verification car rushed across the finish line with a gust of wind, this time Miao Yutong, who had been on guard, lost the flag early, and held the wide-brimmed cowboy hat and miniskirt with both hands respectively, but the flying skirt corners still made her two snow-white round thighs fully exposed to the blazing sun, attracting the eyes of countless male technicians under the maintenance greenhouse.

It took two or three seconds for Xiao Nan to cross the finish line before the motorcycle driven by Xiong Mi and Qi Ran arrived, and although they tried their best in the final stage of the race, even at the cost of making desperate cornering movements on the corner, it was still difficult to make up for the very obvious gap between them and Xiao Nan.

"How about Mi girl, are you convinced this time?" When the three girls returned to the underside of the overhaul greenhouse, Lao Tian, who had been waiting for them for a long time, asked without opening the pot as soon as they met.

Xiong Mi, who had just taken off his helmet, brushed off the bangs that were stuck to his forehead with sweat with his hand, stared at Lao Tian with his eyes quite unconvinced, for a long time, sighed softly, and said very much: "If you lose, you lose, what's the big deal......"

"Do you really think so?" Lao Tian's small eyes, hidden behind the glasses at the bottom of the wine bottle, seemed to smile, and goosebumps rose on Xiong Mi's body. She quickly glanced at Xiao Nan next to her as if she was a little weak-hearted, and saw that Xiao Nan was only concerned about pulling open the zipper of the one-piece suit and fanning it with a fan that she didn't know who handed her, and the expression on her face was so calm that she didn't feel at all about winning or losing just now.

"Okay, I admit it, Cheng Xiaonan is indeed better than me......" Although there are 10,000 reluctances in his heart, Xiong Mi's strong self-esteem makes Xiong Mi unable to tolerate that he will not admit his account after losing, after all, it is one thing to not admit defeat in his heart, and the fact of losing the game is another.

Lao Tian nodded with satisfaction and said with a smile: "Mi girl, your master Yuexi should have taught you, it doesn't matter if you lose, the key is to figure out where you lost, so that you can try to win it back next time." Are you ...... now? Do you know how you lost?"

Hearing Lao Tian's question, Xiong Mi's mouth opened as if he wanted to say something, but when the words came to his mouth, he swallowed them back. Seeing her look of wanting to speak and stopping, Lao Tian shook his head, then turned his face and asked the person next to him, "What about the girl, do you know why you lost?"

Unable to speak, she stared at Lao Tian with a pair of clear big eyes, first nodded, then shook her head, and pointed to the 600CC verification car she had driven and motioned for everyone to come and see. Seeing that he had always rarely expressed his opinions, he actually had "words" to "say", and the girls who were watching next to him also followed Lao Tian Xiong Mi Xiaonan and them to see what was going on.

I saw that he stood in front of the car and first gestured a "one" with one finger, which seemed to indicate that this was the first question he wanted to ask. I saw her point to the instrument on the front of the car, the two fingertips of her right hand compared it on the scale of 7,500 to 10,000 revolutions on the tachometer, her left hand made a movement in the air like an airplane climbing vertically, and then used the tips of her right fingertips to compare it on the scale of 11,000 to 13,000 revolutions on the tachometer, and her left hand made a plane flying to a high point and suddenly dived downward, and then looked at Lao Tian and shook his head exaggeratedly, saying that he didn't understand why.

After doing all this, she made a "two" gesture with two fingers, and then she pointed to the rear tire of the locomotive, and made several movements in a row with gestures, probably feeling that the gesture could not accurately express her intentions, and the expression on her face was a little anxious. She turned around and seemed to be looking for something around, and found a palm-sized model locomotive on Lao Tian's workbench, so she ran over and took it in a few steps, squatted down and pushed the model locomotive with her hands, and made a tail flick on the ground with the front wheel as the axis, and the whole body slid sideways greatly laterally during the movement.

After doing this action demonstration, he stood up and returned the model to Lao Tian, and then stretched out a thumbs up to Xiao Nan to make a gesture of praise, and then put the hand that stretched out his thumb back into his heart and patted it, and the look on his face seemed to admire Xiao Nan.

Seeing that Qingran finished expressing her two questions with gestures, Lao Tian smiled, turned his face to Xiong Mi next to him and said: "Mi girl, look at the people, although they lost, at least they still know where they lost, what about you, you didn't dare to say anything you wanted to say just now......"

"What! At most, she knows where she lost, but she doesn't know what the reason is......" Xiong Mi glared at Lao Tian angrily, and reluctantly admitted: "Okay, in fact, I'm the same as Qingran...... It's just that I've already changed cars once in advance because of this, and I lost again this time, so I really don't have the face to excuse myself again......"

"That's pretty much ......" Lao Tian nodded with satisfaction and said to Xiao Nan: "Cheng girl, since the two of them want to know why they lost, do you want to teach them a good lesson?"

Xiao Nan looked at the innocent look and the unconvinced Xiong Mi, and smiled helplessly: "It's too exaggerated to go to class or something, but I'm willing to tell you about the reasons for this, but first of all, ......" She turned her face to Lao Tian and said: "I have a question to ask Tian Gong first, have you told the two of them in advance that the locomotive has adjusted the gear ratio of the transmission shaft and the ECU fuel injection map?"

Lao Tian nodded at the two girls: "Na, you ask them how they are~" Xiao Nan turned his gaze back to Qingran and Xiong Mi when he heard this, and both girls nodded.

"Don't you think it's a lot slower after pulling the engine up to 11,000 rpm?" Xiao Nan asked.

"Yes, it's a lot worse than before the adjustment, and I feel like the accelerator is tightened to the end, and the car just won't ......run," Xiong Mi said, and the Qing Ran next to him also nodded vigorously to show that he agreed.

"In that case, then why do you still maintain a low-gear driving style with high revs?" Xiao Nan asked again. The two girls looked at each other, and Xiong Mi replied, "Because...... Because since I learned to drive a car, my master has always taught me like this...... In a sports inline-four engine, high rpm means high power, and higher rpm leads to more power, isn't that right?"

"Yes, you're right. Xiao Nan affirmed Xiong Mi's words: "But you're talking about driving those four-cylinder sports cars that were born for the track, not the kind of locomotive we are driving now......"

"Is there a difference?" Xiong Mi asked rhetorically, "I used to drive like this, and I don't think it's any different from a Japanese four-cylinder sports car?"

"Yes, you're right, I've driven this car a few times before, and it feels very similar to the Japanese 600cc four-cylinder sports car, and the higher the revs, the more ...... But now the situation is different......" Xiao Nan said this, pointing to a blackboard erected next to Lao Tian's workbench, on which a lot of words were written in a mess, and some sticky notes were glued with magnets, which were obviously used by Lao Tian as a memo. "Come, let's come here, I'll draw a picture for you......"

Following Xiao Nan to the blackboard, in addition to Xiong Mi and Qing Ran, the girls of the team and many good technicians also surrounded them. Xiao Nan picked up the blackboard and erased it a few times, cleared out a piece of the blackboard, drew a vector schematic diagram with chalk on it, and wrote words such as speed, power, and torque on the table.

"The arrow on the left represents the maximum power, the arrow on the right represents the maximum torque, and the horizontal line below is the speed, and the ......speed line increases from left to right," Xiao Nan said and drew two curves between the two arrows, and there was a position between the two curves that happened to cross together. "This curve is the power curve of the engine, which increases with the rpm to reach its maximum power at 10,000 rpm, and then begins to decay from there, until it reaches 14,000 rpm and only 65 percent of the maximum power remains......"

Speaking of this, Xiao Nan stopped, looked at the "audience" around her, Lao Tian and the technicians didn't react at all, and the beautiful girls stared at each other with a confused face, and couldn't help but worry that they might not be able to understand what they said, but it had come to this point, and she had to say it hard, so she added another curve to the blackboard, which did not coincide with the first curve, but there was a position in the middle that crossed together.

Xiao Nan pointed to this curve with chalk and said: "This line is the torque curve of the engine, you can see that it is also linear, and it also increases with the increase of speed, reaching the maximum torque of 9,400 rpm." Here......" Xiao Nan focused on the intersection between the two curves: "This represents the best balance of power and torque, it is probably located at a position of just less than 10,000 rpm, here, is the best speed area for shifting, shifting gears in this speed area, your engine can always be in the strongest state, which is very conducive to speeding up again after shifting......"

Saying that, Xiao Nan used chalk to point a dot on each of the two lines: "But the two of you always maintain the speed between 11,000 to 14,000 rpm, you see, at this time, the power and torque of the engine have dropped significantly, the power is only 85 to 65 percent of the peak, and the torque is only 80 to 60 percent of the highest point.

After Xiao Nan finished speaking, he was cold for a few seconds, Xiong Mi and Qing Ran nodded as if they didn't understand, and the other girls in the team were even more confused, as if Xiao Nan was speaking Javanese to them.

"Then why was it okay to shift gears at high revs before?" Xiong Mi asked, she no longer had the strength to be unconvinced at the beginning, and she had a feeling of being upset to Xiao Nan.

Xiao Nan smiled approvingly at Xiong Mi and Qingran: "It used to be, because the car at that time was still set according to the foundation of the Japanese four-cylinder sports car, including the camshaft line, ECU fuel injection map, and transmission shaft gear ratio...... But now it's different, hasn't Tian Gong already told us that the ECU fuel injection map and transmission gear ratio have been changed......" Xiao Nan glanced at Lao Tian and asked: "Tian Gong, if I guess correctly, our verification car is going to be officially finalized, right?"

Lao Tian nodded: "Yes, the next step may be to change the line type of the camshaft, and then you can carry out painting and coating, and then it will be finalized and can be mass-produced." ”

"I don't understand, why do you want to change it like this?" Xiong Mi asked: "In this way, the performance of our car is much worse, I only ran to two hundred and forty-five today, I just looked at your record on the computer, and you only ran at two hundred and forty-nine per hour." But if I'm not mistaken, you've run two hundred and eighteen ...... on this track."

"Well, I think it's about durability. I remember Mr. Zuo once told me that our prototype car is a large reference to the Japanese Kawasaki 600 four-cylinder sports car, which was originally designed to be used on the track, and the life of the moving parts of the engine is only a dozen hours, and the life of such parts is put on a locomotive that focuses on the civilian high-end street sports car market, which is simply fatal, who do you think will spend tens of thousands of dollars to buy a high-end four-cylinder car that will burn engine oil in a few days? If that is the case, Zongxin Group will not be able to scold the world's motorcyclists~Xiao Nan said with a smile: "Therefore, the technicians of the second part of the new product have made compromise restrictions on the performance of the verification car, which not only ensures the durability of the key components of the vehicle, but also saves costs to a certain extent, and even makes the engine very fuel-efficient, killing three birds with one stone, why not?"

PS: I accidentally wrote more than 4,000 words today. Maybe there will be many readers who feel at a loss when they read this chapter, just like the team girls in the novel, haha~ By the way, I recommend a friend's book, "I Remulina Don't Love You", everyone is interested in looking for it, maybe it's your appetite!