The BMW 4 Series is a series of its own.
I believe that cars also have dignity. If the name of the 3-series enhanced version is rigidly attached to the 4-series, it is estimated that it will never agree. In fact, whether it is the BMW 2 Series, the BMW 4 Series or the BMW 6 Series, it is unique and unique. You know, BMW never lacks explosions and supporting roles. Being unique under the brand gene that pays great attention to inheritance means that you must have extraordinary identity and skill, and no one can underestimate it.
The continuation of the essence of sports
BMW is passionate and stubborn. In BMW's eyes, the inheritance of the essence of sports cannot be changed and needs perseverance. You can even use rigid dogma to describe it, but you can never deny it. The front-to-rear weight ratio is 50:50, which was originally a hard indicator of M series models. Now, not only the 3 series is following, but also the 1 series car is the forerunner. What is the reason for not following the 4 series which pays more attention to sports driving control? The design of short front suspension solves the problem that the vertical engine occupies a large space and the center of gravity moves forward. The driver's center of gravity is basically locked at the midpoint of the front and rear axles, which not only provides enough engine space to accommodate the engine, but also ensures that the center of gravity of the car body moves backward and meets the rigidity index of 50:50. To put it bluntly, all efforts are aimed at solving a problem-reducing understeer and oversteer.
So we can understand why BMW can play professional sports on medium-sized cars with a wheelbase of more than 2.8 meters. Since the 4 Series is still imported, the wheelbase has not been lengthened, and you can also understand that there is no compromise practicality. The body length of 4670mm is not much longer than that of many A-class cars. The short and pithy features are in the same strain as the 3 Series, but the wider and lower body tells us that this is a guy who pays more attention to the low center of gravity than the 3 Series.
The familiar B48 engine matches ZF's 8-speed automatic manual transmission, which is an absolutely reliable combination. One hundred years ago, the engine sound from a factory in Munich, Bavaria, meant the birth of Ward's top ten hospital champions. Valvetronic electronic valve, double scroll turbine, aluminum alloy exhaust manifold, etc. These technologies have been branded on the business cards of BMW engines. Based on McPherson suspension, the front axle of the two-ball damper and the five-link rear independent suspension are still partners, and the all-aluminum suspension reduces the unsprung weight. These details have not changed in series 4. The only difference is that the 440i is equipped with a 3.0T L6 engine, which is beyond the reach of the current 3 Series.
The toe-in of the front and rear wheels improves the cornering stability of the vehicle, and the 4 series also adopts tires with different front and rear sizes, which is a sign of paying attention to performance. The tire width of the rear tire is 255, so as to obtain much-needed grip under rear wheel drive.
A different side.
There is inheritance and independence. Compared with the 3 series, the 4 series is not so satisfactory in body shape. There are not only four-door coupe versions, but also two-door and convertible versions. More diverse and dynamic modeling design makes the style of the 4 series obviously different from that of the 3 series. All models are equipped with M sports kit, and the wooden decorative board in the interior can be replaced with fiber decorative board, which reveals an unavoidable sharpness under elegance. Series 4 has achieved excellent results in subjects with low center of gravity, not only the body center of gravity is lower, but also the sitting posture is lower. The organ pedal is matched with the leg rest, so the driver can drive in a semi-lying position, and the line of sight will not be too limited.
The price of Series 4 is between Series 3 and Series 5. With the increase of price, Series 4 pays more attention to quality. The workmanship and materials for the interior can only be done by going up a flight of stairs. Harman Kardon's acoustics cover low-end models. These details give me a very intuitive feeling-4 series is more advanced.
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2 Driving experience sharing returns to the peak
The moment you hold the steering wheel, it is the beginning of driving.
From the moment I held the steering wheel, I knew that driving had already started, and this time only the mountain road could bear it. However, on the way to find the mountain road, something went wrong, and I stumbled into an unknown country road. The flat road seemed to be crumpled by the wheels, and the 4-series at the foot began to become impatient, hanging like two unbending knees, constantly hitting my ass. The rumble of low-twist engine in sports mode seems to be a complaint to me, so I have to switch to comfort mode wisely, but it is not much better.
The steering wheel doesn't give me face either. It seems that every time I turn slowly, I don't want to keep fighting with me and show me its stubborn temper. To tell the truth, this feeling is not friendly, or because we just got along, I think it is not easy to control on such a bad road. Actually, it is understandable. It doesn't belong here after all.
After driving into the mountain road, these shortcomings became advantages. Switch to sports mode again. With the gradual deepening of the throttle, the sound becomes deeper and more beautiful. With the tempered sound, it indicates that a game may start at any time. At this time, Department 4 showed a high degree of tacit understanding and discipline. All the parts seem to be running in an orderly way on the predetermined track, such as throttle, brake, steering and so on. Has become a whole. All I need to do is hold the steering wheel tightly and try to improve my confidence and courage to cope with the passion and challenges it brings me.
At this time, I'm glad that Series 4 has a short and compact suspension, because there is no annoying bump when driving on the mountain road, and all that remains is that the shock absorber compresses and releases cleanly every turn. When challenging sharp corners, I don't have to worry about the body roll. I can always keep my body stable with a low center of gravity and strong suspension support. I even have the illusion of flying close to the ground. The balanced front-to-rear ratio makes the 4 series have extremely high cornering quality. At first, I was worried that too fast speed would lead to understeer, and I didn't dare to make big moves when approaching bending center. I'm worried that rear-wheel drive will lead to oversteer, which makes it difficult for me to control. However, it turns out that these fears are superfluous. The rear wheels cling to them like they are on the ground, and the front of the car is maneuverable enough to cope with your violent driving. Trying to challenge its limits is a dangerous thing. In my opinion, there is only a slight difference between grasping the ground with confidence and losing control. Wandering on the verge of losing control, this is not the style of 4 series.
Of course, there are more exciting things. Switch the mode to SPORT+. At this time, the electronic body stability system and traction control system will be turned off, and the attitude of the body will be completely controlled by the driver. However, I have always been wary of excessive steering of rear-wheel drive, so I haven't tried too much on mountain roads. Of course, if you can experience it outside the track, this mode will be the best choice. Although the throttle is very sensitive, the engine will have different reactions every time you step on the throttle. How to control the throttle more finely is a major issue when driving the 4 Series.
The peak torque of the 2.0T high-power engine generate for test drive is 350n·m, which is enough to make me feel its desire for mountain driving. Presumably, the 440i equipped with a 3.0T engine will behave even crazier. BMW has its own sports aesthetics and logic, such as the torque output adjustment of the engine. Compared with other 2.0T engines of the same class, the parameters of 350n·m are not so dazzling. After all, some have reached 400n·m, but the power output of the engine is always just right. The actual feeling of this performance is that I don't have to worry about the lack of power connection after cornering, and I don't have to worry about the sudden power that I can't control. Everything is under control, and every corner is faster and smoother than I thought.
The motion logic of ZF 8AT gearbox is also an aid. When I release the throttle, the gearbox will keep the engine speed at a high level, as if waiting for my next throttle. So when I step on the accelerator and continue to accelerate, the gearbox with downshifting action is saved, which can help the engine transmit large torque to the wheels at the fastest speed. Of course, you can also use shift paddles, which will be another driving experience.
Although there is no blessing of the variable motion steering system, the steering of the 4 series is still unforgettable. This unforgettable feeling is more reflected in the heaviness, which is not good in daily slow-paced driving, but when I go to challenge the corner, the tight and precise steering makes me feel very relaxed. Without too much adjustment, facing different corners, the direction can always be reached in one step. In fact, Series 4 and Series 3 have the same understanding of sports, and pay more attention to the overall balance of vehicles and the integration of people and vehicles. Whether it is the engine or the steering system, the sense of existence is very low. If this is an aesthetic, I will say that I really love it.
Frankly speaking, before the test drive experience, I think the personality of Series 4 will be more prominent, and the definition of limit will be clearer, which may be more difficult to control than Series 3. However, after a trip, I even began to doubt the necessity of xDrive in Series 4. Of course, this is just a joke, or I am too timid to take this 430i to the extreme. But I think, after all, it is not an M series, of course, not to dress up as an M suit, but actually to pass on its own sports concept to drivers. You can also regard the driving control of Series 4 as the advanced level of Series 3, which undeniably makes the movement more pure and thorough. Finally, I still want to say that the steering wheel is really heavy. As soon as I hold it, I know the challenge is about to begin. ...
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3 performance data test back to the top
Performance test: stable performance
0- 100km/h accelerated test
For BMW, which emphasizes balance, acceleration performance has not been its most prominent advantage, which is also reflected in the 430i tested. The measured acceleration of 6.38 seconds is not outstanding, but it is definitely not weak. Switch the mode to SPORT+ and set the gear lever to S position, at which time the maximum engine speed allowed to start is 3000rpm. When the speed pointer points to this point, the system will start the launch control and start the control system. The rear wheel only skidded briefly and clearly at the moment when the brake was released, and then flew forward with a powerful sound. The shift of 8AT gearbox can be described as forceful, which conveys an exciting mechanical texture with the increase of vehicle speed.
From the measured graph, the acceleration G value at the initial stage reaches 0.7g, and the whole acceleration process is stable and powerful, and the shift fluctuation can also be reflected from the graph, but the actual G value fluctuation is far less obvious than the in-car experience. The whole acceleration process can be described as smooth.
100km/h-0 braking test
Thanks to the balanced body weight, the posture of the whole braking process is very stable, and there is no obvious forward leaning phenomenon. Coupled with the strong support of the front suspension, it can be clearly felt that the integrity of the car body is very high when braking at full strength, rather than the center of gravity moving forward and all the weight pressing on the front wheel. The braking force in the whole process is very linear, which leaves a deep impression on people.
The measured braking distance is 38.33 meters, which is a normal performance for a car that pays attention to driving control. It can be seen from the fluctuation of G value that the whole braking process is very smooth, almost in a straight line, which is also rare.
noise test
When idling, the noise control in the car is excellent, the presence of the engine is very low, and the noise value of 35.7 decibels can also be called quiet. However, it can be seen that the noise control of Series 4 is not as hard as that of sports performance, and the noise reduction measures are limited. The actual noise performance is quite satisfactory, and the main noise source is road noise. Tires with low flatness feedback the real road conditions, and so does the noise. In addition, the design of frameless door makes wind noise penetrate through the glass at high speed. From the measured results, the noise performance of Series 4 is slightly worse than that of most mainstream B-class cars, but it is acceptable on the whole.
A more comprehensive understanding of the top of the 4-series gyrus
4 series from the point of view of design and use
The lower posture makes the 4 Series look better than the 3 Series. The M sports kit is just an ornament, and the smooth and elegant posture is the biggest difference of the 4 Series. The four-door model is not named Coupe at will. The back-sliding rear is equipped with a hatchback tailgate, which is beautiful and practical, and shows the temperament of the 4 series. However, such a design will inevitably affect the seating space in the back row, but for the 4 series, space is not the most critical issue, and how to look better is the key.
M sports kit adds a lot of details to the body. In the absence of double doors and convertible, frameless doors have become an indispensable element of the four-door version. It seems that with it, we can prove the identity of Department 4.
Coral red interior with carbon fiber aluminum trim, in my opinion, is the best interior collocation of Series 4. The Dakota leather seat has a "rough" handicraft texture and black decorative strips, which show an ingenious craft. The two wings of the sports seat also support electric adjustment, which can wrap your body tightly and make you feel safe no matter how you drive. BMW's sports seats are better in ergonomic design, but if you ride for a long time, you will inevitably feel tired.
The 430i doesn't have many driver assistance systems. Panoramic image and blind area monitoring constitute the core active security system. As for automatic parking, driver assistance function and active cruise control system, they are all optional for the 430i, but I think these are irrelevant, and driving is the most important. When the blind spot monitoring system detects the danger of lane change, it will send out a short and clear steering wheel vibration when you make a lane change, as if to tell you not to be too arrogant. After radar intervention, the 360 image system is automatically turned on, which can clearly show the situation around the car body. Although the 430i has few functions, the details are still satisfactory.
IDrive system pays more attention to practicality, and it is equipped with car wireless CarPlay, professional navigation system, online consulting service and other functions. The screen supports touch, or you can use traditional control knobs and buttons. For those who are familiar with BMW, this system is very easy to use.
Test summary: After running the mountain road, try to slow down in a crowded city to experience the other side of Department 4. It is true that the personality of Series 4 is not as easygoing as that of Series 3, but when you are familiar with it, you will feel a touching intimacy, or you will find it rare to meet a car that can read yourself. Not limited by the wheelbase, not affected by the level, its job is to try to show you the best of yourself while holding the steering wheel. How can you not love such a car?
Compared with the suit mob, Series 4 is more like a gentleman in a suit and tie, who can calmly and elegantly show his true self. Probably not the object pursued by fanatics, but more living in their own sports world. If your sports concept is consistent, please get on the bus and enjoy it. If it's different, don't force it.
(Photo/Text/Photo: Pacific Auto Network Huang Keyu)
5 model parameter configuration comparison back to the top