I bought the first car and drove it for more than two years. I decided to switch to the rear model. The three benefits of the car in front are obvious, but two pain points are hard wounds. When buying a car, pay attention to the front car or the rear car. Only by understanding the advantages and disadvantages of the front car, the rear car, and the four-wheeler can we avoid regret after buying a car. Buyers with a budget of 150,000 are using cars. Most riders may not care whether it's the front car or the rear car, but with a budget of more than 200,000, the gap between the front car and the back car has become obvious, and many riders say they regret choosing the wrong car. Generally speaking, the car is divided into three types: forward car, rear car, and four-wheel drive. According to the setting position of the engine, it can be divided into four types: front-facing front-drive, front-mounted rear-drive, mid-mounted rear-drive, and rear-mounted rear-drive. For private cars within 200,000, almost all of them are front-facing front-drive. More than 200,000 private cars, sports cars, supercars or various types of trucks are generally rear cars, and some heavy-duty SUVs and off-road vehicles use four-wheel drive. Elaborate on their strengths and weaknesses. Why are private cars generally front cars?
1, compared with the cost of making cars, the front desk driving cost performance is higher, the front car engine is in the front, the engine directly drives the first two wheels through the half shaft, no need for structural components such as the transmission shaft, the complexity of the rear driving is low, and the car company can effectively save production costs. In other cases, the cost of the front car is at least 20,000 less than the rear car. However, there are still shortcomings in the front-drive horizontal engine. The front wheels must be responsible for both drive and steering. The wear of the front wheel is much greater than that of the rear wheel, and the general tire replacement time is 40,000-60,000 kilometers, but the front wheel may be replaced 10,000-20,000 kilometers earlier than the rear wheel. Similarly, due to the heavy front of the car, the braking system is heavily loaded and the losses are obvious. 2, the space of the front drive is greater than the utilization of space, the front car engine is generally placed horizontally at the front of the car, and the rear wheel does not need a transmission device, which means that the rear and trunk have a lot of space. If you look closely, almost all the rear cars and the middle of the four-wheel drive rear seat have a protruding "nose bridge".
BMW 5 Series rear car Of course, the front car also has a rear central uplift model, but it is relatively small, rear central uplift. The following is generally a drive shaft, exhaust pipe and other structures, different models of design considerations are different, the results are also different, but the rear central bulge is a very common phenomenon, occupying the rear space. A lot of rear central bulges, so it's 5 cars, but the feet on the upper rear central seat are not put down, very uncomfortable Cadillac forward car
3, fuel consumption comparison, the front car fuel consumption is relatively low in front of the car engine power transmission is more direct, no need to transmit power through the long drive shaft, the power loss is relatively small, the vehicle structure is not as complex as the rear car, in the same case, the overall weight of the front car is slightly lighter, on the whole, the fuel consumption of the front car is slightly lower. In addition, the rear car attaches importance to sports performance, and the general engine power is also slightly higher, and the natural fuel consumption is also slightly higher. In addition, the two models of mid-mounted rear-drive and rear-drive are generally supercars, and most of the sports cars use Porsche 718, Porsche cayman, Lamborghini, Ferrari and other mid-mounted rear-drive
4, compare the driving feeling, control performance of the front drive of the engine, transmission is generally lying on the front of the car, almost two-thirds of the vehicle weight concentrated in the front of the car, the front wheel is not only responsible for driving, but also responsible for steering, both profitable and unfavorable. For example, when climbing steep slopes, the grip of the front wheels is weakened due to the backward tilt of the center of gravity of the vehicle, which is easy to slip. When starting on the flat ground, the front of the car is heavier, the friction resistance of the front wheels is also larger, and the starting power is slightly slower, which affects the acceleration performance of the vehicle. When using the rear car to climb a steep slope, the center of gravity of the whole vehicle is backwards, the rear wheel grip is strong, and the rear wheel is driven by itself, which looks like a climb and has power. 20 years ago, the front wheel of the tractor was slippery on the steep slope and could not climb the steep slope. At this time, I saw several drivers standing at the front of the car, increasing the weight of the nose, and it was easy to come up, in fact, the reason was similar.
Some drivers will make a U-turn. Reversing, reversing uphill, it's easy. In fact, compared with the forward car, if the reverse car climbs, the weight of the vehicle will be concentrated on the front of the car, the friction resistance of the front wheel ground will increase, and the grip will be enhanced, and it will be easy to climb the slope. Of course, there are also models that use the most suitable torque for the engine in reverse mode, and it becomes easier to go uphill. Secondly, due to the heavy front of the car in front of the car, the inertia when braking urgently, there will be a "nod" phenomenon when getting on the car. The rear weight is reasonable, and the brake nod is not obvious.
Finally, in a more powerful automatic car, the front wheels are easy to slide and idling when pressing on the throttle to overtake and accelerate suddenly. At present, this is still outstanding even if the vehicle has a body stabilization system such as ESP. Therefore, for automatic cars, remember to switch to manual low gear before overtaking, or switch to sport mode. For rear models, the engine is generally placed longitudinally. In this layout, there is more front space, the front of the car is longer than the front car, and the door position of the forward car is also shifted backwards. It's also the easiest way to distinguish between a front and rear car. Vertical layout, part of the weight is scattered in the rear of the vehicle, is conducive to reducing the weight of the front, the front wheel is responsible for steering, the rear wheel is responsible for driving, under the wheel load distribution, the average ratio of 50:50 can reach the forward car, it can be said that the front car rear drive is the ideal driving method.
Theoretically, the turning radius of the rear-wheel drive is generally larger, and the maximum speed is more obvious than that of the forward car, but if the front wheel has begun to turn, the inertia of the rear-wheel drive will promote "overtaking", which is what we call the "tail" turn. Similarly, the forward car has a "insufficient" turn, but the four-wheel drive perfectly solves the problem. Of course, this is directly related to vehicle cost, automobile enterprise technology, driver technology, even if it does not cost money, high training technology, good driving technology, naturally will not be understeered, oversteered. On the contrary, for people who like sports cars and racing cars, it is the joy of driving to use the brakes and throttle to control the driving dynamics of the vehicle.
In addition, the rear model is on the ice and snow road, muddy road, because the vehicle center of gravity is located at the front of the car, the ground friction of the rear wheel becomes smaller, the grip is weakened, and it is easy to slip. In this case, some drivers will bear the weight in the rear and trunk and are prone to drowsiness. It is said that the rear car is prone to oversteering. It is said that the front car is safer than the under-steering of the front car. This is true in theory, but now auto companies make up for this shortcoming by teaching technology. The key to safety also depends on the driver's autonomous actions. In short, the main advantages of the front car are that the price is relatively cheap, the space utilization rate is high, the fuel consumption is low, and it is generally suitable for family cars. The main advantage of the rear car is that it has strong athletic performance and a certain economic foundation, which is suitable for riders who attach importance to driving performance. If you like self-driving tours and off-road rides every day, four-wheel drive vehicles are preferred. If you like "every" and "drift", then you like supercars