"Brother Fei, you even brought the clutch plate, I was thinking about this problem just now, I was afraid that the gearbox would not be able to withstand the torque of the modified engine."

Hearing this, Zhang Yifei also replied with a smile: "Ah Hu, how much horsepower are you going to change this car to?" ”

"At least five hundred go up, the bigger the better!"

There is a famous saying in the power industry, that is, the power of the brick! That is to say, as long as the power is enough, you don't care about aerodynamics at all, even if it is just a brick, it can fly you into the sky!

Of course, this is just a relatively exaggerated analogy, but Ah Hu is a supporter of berserk power, 500 horsepower is only his basic goal, if he can, he is even willing to change this car to thousands of horsepower, but the current conditions do not allow it.

This is the potential of 4G63, the reason why EVO can become a generation classic with GTR and Toyota Supra is because its engine modification potential is really amazing, even after 20 years, in addition to small problems such as fuel consumption and emissions, the power is still worthy of the top supercar.

But if you want to change to such an exaggerated power, heat dissipation is the biggest problem, because the 4G63 is a cast iron engine. This material is not advanced, even if it is a civilian-level vegetable cart in later generations, many of them are aluminum alloy direct injection, but precisely because it is cast iron, the strength is much higher than that of aluminum alloy, and it is suitable for modification.

The disadvantage is naturally that the heavy heel heat dissipation is not good, the fourth generation of EVO has improved the intercooling system, so that the engine can maintain better working conditions, but this is still not enough, more horsepower means more exaggerated heat, and it needs to be overhauled.

Chen Zhi next to him heard the words of five hundred horsepower, and couldn't help laughing: "The horsepower is not as big as possible, one is that the accessories are not complete, this kind of change basically needs to replace the entire engine bearing, and there is the matching with the body gearbox, too much horsepower is easy to push the head, I think the most suitable range is still about 400P horsepower." ”

400P horsepower is also a reasonable number in Zhang Yifei's mind, as a rally driver in later generations, the rally car he drove was designed in accordance with WRC standards, and the maximum power limit was actually 300P.

However, this is not the limit of rally, the eighties rally also has a Group B group, this group is also called the unlimited modification group, that is, as long as the manufacturer's strength is enough, you can even change it to aircraft power, so there are all kinds of monster rally cars with more than 500P horsepower and 0-100 kilometers acceleration in 2 seconds.

Later, with the popularization of racing safety planning, the unlimited modification groups of various FIA events were basically cool, and the scene of walking a tightrope was much less.

Because of the different types of events, rally cars are more interested in the explosive power of 0-100, and the power requirements are secondary, and the 300P horsepower is completely sufficient.

The caravan race has higher requirements for horsepower, and the later CTCC (China Touring Car Championship) super group 2.0T displacement power, the general power is about 450P, but you must know that now it is 20 years ago, and the power of 400P is completely enough for Zhang Yifei to fly on the track.

If you insist on making any crushing power, then the time required to overhaul the engine is undoubtedly too long, Zhang Yifei does not have so much time to test the car, as long as there is news from Uncle Lu, he will go to Hong Kong Island as soon as possible.

Chen Zhi and Ah Hu are both young people, and their hands are very fast, and almost when they are talking, they have already begun to dismantle the Mitsubishi EVO. Although I didn't plan to completely squeeze the Mitsubishi EVO 4G63 engine this time, I still planned to replace some 100mm crankshafts and other accessories to prevent the cylinder from bursting at high horsepower for a long time.

In the afternoon, Feng Linmu also came over, and Zhang Zhiguo closed the car repair shop in front of him and stopped taking orders. The four maintenance workers in the entire car repair shop all revolve around this Mitsubishi EVO, and their actions and maintenance habits are quite like a racing car maintenance team.

Zhang Yifei can feel that Zhang Zhiguo is very excited, maybe after so many years, he finally experienced the complete team division of labor and cooperation again, overhauling a sport-level performance car, this is where people's blood is rekindled.

Feng Linmu is responsible for the replacement of the crankshaft, Zhang Zhiguo is responsible for the transformation of the intercooling system, and Chen Zhi doesn't know where to get a notebook that is considered an "antique" in Zhang Yifei's eyes, and began to brush the ECU for EVO, and the last part is to change the clutch plate of Ah Hu.

It can be said that this is what a professional team should look like, even if Zhang Zhiguo thinks that he has no hope of returning to the track over the years, he still leads apprentices according to the standards and behavioral logic of race engineers, Chen Zhi and Ah Hu are the same.

In terms of hardware transformation, Zhang Yifei can quite understand, the only thing that makes him feel a little novel is Chen Zhi's ECU.

ECU is simply the car's driving computer, if the engine is compared to the heart, then the ECU is the brain, and all the running actions of the whole car need to be controlled by the ECU data.

It can be said that ECU belongs to the software problem of automotive engineering, and the vast majority of auto repair personnel cannot reach this level, and the ECU data was saved by Feng Linmu before, but he did not expect that he handed over such an important aspect of ECU to Chen Zhi this time, which means that Brother Zhi has reached the level of an automotive engineer, rather than a simple maintenance technician.

There is such a scene in the movie "Initial D", Edison Chen took a computer and put it on the engine cover, and all kinds of data in the screen or something, and then Jay Chou came over to ask after seeing it, and he also asked if the car was broken, but Edison Chen said that he was changing the car.

However, in the movie, Edison Chen also involves the tuning data of the chassis, and the engine modification needs to export the original ECU data, and then rewrite it, which involves the rewriting of some data such as ignition advance angle, fuel injection volume, fuel injection time, and the concentration of combustible mixture, which can be said to be very professional.

Whether this EVO can make the power and torque match perfectly in the end depends on Chen Zhi's programming level.

HKC's mushroom head was installed, SARD's intercooler pipe was replaced, and the spare parts were modified in an orderly manner. Zhang Zhiguo also knew that Zhang Yifei's time was very tight this time, so several of them could be said to be working overtime, and the business of the car repair shop in front was completely put on hold, and even eating was just a boxed lunch in the warehouse.

Two days later, the hardware transformation has been almost done, and the rest is test commissioning.

To be honest, this kind of speed can be described as god speed in a general car repair shop. But in the competition-level maintenance team, it can only be said to be a general level.

You must know that in a rally, crash overhaul is simply commonplace, and in order not to affect the race, the repair time is calculated in hours.

And the most well-known team efficiency cooperation in the racing car is estimated to be the scene of the F1 race pit stop to change tires, think about how long it takes for the general car repair shop to change a tire, and the time for F1 to change four tires is only a few seconds, that's why, never use hobbies to challenge other people's careers, the peak professional skills are too strong.

The road test stage was done by Chen Zhi with Zhang Yifei, but this time it was not in the school playground, but found a large driving school to borrow the venue.

Chen Zhi constantly recorded Zhang Yifei's posture habits, and then debugged the various ignition and fuel replenishment times of the ECU, trying to achieve the integration of people and vehicles.

That is, when Zhang Yifei was testing the car, he received a call from Lu Ningping from Hong Kong Island and gave him a piece of news that he didn't know if it was good or bad.