Why is QQ Speed ??useless after modification?

Vehicle modification: Another issue is the performance of the car. Cars with faster speeds are more expensive. Damage to the car during the collision will affect the performance of the car body, and it will cost a lot of money. If you sometimes feel that you can't accelerate no matter what, one is the performance of the car itself. Each car has its own upper limit of speed. Unless it is modified, the upper limit can be increased. The other is that there is something wrong with the car. In the upper right corner of the screen As can be seen in the perspective view of the car in the corner, the parts marked in yellow are the ones with problems. Enter the modification options, which are divided into external modifications and internal modifications. Each modification requires a fee, which you can earn from competitions. Exterior modifications include: body paint, tire size, rims, glass colour, advertising slogans on the windshield header, slogans on the hood and doors. Internal modifications include: engine, ride height, anti-roll bars, nitrogen, and turbo modifications. Except for the tires, the rest of the exterior modifications basically play a role in aesthetics. This is already mentioned in the detailed explanation of the menu above. Modified tires: What is actually modified here are rims, which provide more than 40 styles and types, with sizes ranging from 15＼16＼17. Personally, the smaller the better. During driving, the tires wear out the fastest. The front wheels of front-wheel drive cars wear out quickly due to the influence of braking. On rear-wheel drive cars, due to the heavy load and the driving wheels, they wear out quickly. faster. Therefore, it is best to protect the tires during the race. It is better to use manual transmission than automatic transmission. Modifying the engine: The engine is also the most important thing. By increasing the horsepower, the car will perform better and run faster. Performance Impact TOPSPEEDTOPSPEED ACCELERATION Modified Chassis: The speed of the car can be increased without adding any acceleration accessories. Whether to change it to a lower or higher level depends on the road conditions. We know that the lower the chassis, the faster it is. However, if the road is bumpy, it will squeeze the tires and the shock absorbers will also be affected, which will easily get stuck on the chassis. But currently There are no competition roads with harsh environment yet, so it is up to the players to decide whether to raise the chassis or not. However, there are no raise or lower options in the game. There are only 4 options. You just need to judge according to the performance bar marked on the picture. Performance impact TOPSPEED ACCELERATION modified suspension system: The suspension system consists of push rods, rocker arms, torsion bars, shock absorbers and wishbones made of carbon fiber. This is the control