What is a head push and tail flick, what is the difference, and is it harmful to the car?

Pushing the head (understeer) and tail flick (oversteering) are problems that luxury cars or many performance cars are trying to avoid. These problems are not unique to high-end cars, and should be avoided as much as possible regardless of the level of model. Head pushers and tail flicks are actually related to safety, because during the initial development, engineers tried to avoid these two problems as much as possible in terms of chassis tuning, power delivery, tire type, weight distribution, etc.

To be clear, don't talk about extreme driving, drag racing, drifting, racing and other sports are not on the agenda of today's discussion.

Push head (understeer).

The phenomenon of pushing the head refers to the fact that when you are about to turn, the front wheels are not able to turn in the direction you want to go because of the lack of grip on the front wheels, which is more common in front-wheel drive models. For example, when you want to make a quick 90-degree turn, the front of the car may just turn 50 degrees.

Tail flick (oversteer).

Tail flick is the rear of the car, and when cornering, the rear wheels have a lack of grip, causing the vehicle to turn at more angles than you would like, usually on rear-wheel drive models. For example, you would have wanted to make a 60-degree turn, but the car made a 90-degree turn because the rear wheels were skidding.

Therefore, the main advantage of front-wheel drive vehicles is the manufacturing cost.

Space for stable driving. The disadvantage of front-wheel drive vehicles is that the weight of the car is concentrated in the head, and the weight of the car is unevenly distributed, and the front is heavy and the rear is light. And the front wheels have to withstand the two-way function of steering and traction. In this case, if you are turning, the front wheels must have traction friction on the one hand.

On the one hand, it is necessary to overcome tangents.

Centrifugal force in the direction.

When the speed is too fast, it is easy to understeer.

The main advantage of the rear-wheel drive is the average weight of the body, BMW.

It tends to have a 1:1 weight ratio (not absolute, but approximate) in front and rear, and the weight of the whole car is uniform. Rear-wheel drive and front-wheel steering do their job. The handling of the car will be much better. However, it is prone to tail flicking. Imagine pushing a shopping cart in a supermarket.

and the difference between pulling a shopping cart.

The push head is that the front wheels of the car lose grip and cannot make effective turns, and the tail flick is that the rear wheels of the car lose grip and the body rotates, both of which will seriously affect the appearance and service life of the vehicle.

The push head slams on the accelerator when the car starts, so that the car moves forward at a high speed, and the tail flick is to slam the steering wheel while the car is moving, so that the car moves quickly, such an operation is very harmful to the car, and it is easy to damage the suspension and tires of the car.

The push head is an emergency brake, the tail flick is a sharp turn, both of which have a certain amount of damage to the car, and the car's sudden braking capacity and rapid turning are easy to wear out the tires, and there are certain safety hazards.

Hello, I am happy to serve you and give you the following answers: car head shaking refers to the phenomenon that the car will swing back and forth due to the imbalance of the vehicle during driving, which is the so-called "head shake". There are many ways to solve the problem of car head shake, but the most common method is to inspect the tires and wheels of the vehicle to ensure that they are of good quality and condition.

If there is a problem with the tires and wheels, you can replace them with new ones to ensure the balance of the vehicle. In addition, the vehicle's suspension systems can also be checked to ensure that they are of good quality and condition. If there is a problem with the suspension system, you can replace it with a new suspension system to ensure the balance of the vehicle.

Finally, the vehicle's engine can also be checked to ensure that it is of good quality and condition. If there is a problem with the engine, it can be replaced with a new one to ensure the balance of the vehicle. Personal Tips:

Car head shake is a common problem that can be solved by checking the vehicle's tires, wheels, suspension, and engine. In addition, the quality and condition of the vehicle can be checked regularly to ensure the safety and reliability of the vehicle.

Summary. Car head shake refers to a situation that occurs when the car is driving at high speed due to the instability of the vehicle itself, that is, the front of the car shakes, and it may even drive the car to the side. The phenomenon of head shaking may pose a threat to the safety of vehicle operation, so measures should be taken to solve it in time as soon as possible.

Can you elaborate on that a little bit more?

Car head shaking refers to a situation that occurs when the car is unstable due to the instability of the vehicle itself in high-speed driving, that is, the front of the car shakes, and it may even drive the car to the side. The phenomenon of shaking the head may slow down the code and pose a threat to the safety of vehicle operation, so measures should be taken as soon as possible to solve it in time.

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Tail flick is a driving technique, also known as side sliding, tire slipping, or drifting. By locking the tires or pressing the accelerator pedal, the relative speed between the tires and the ground is greatly increased, and the static friction between the tires and the ground changes to dynamic friction, and the grip is lost and the situation of skidding. If it is subdivided, it can be divided into power slip tire or inertial drift.

Power sliding tire: Pressing the accelerator pedal takes advantage of the instantaneous acceleration of the engine power to slip, and can make a spinning action on the spot. Inertial drift:

At a certain speed, the tires are skiddled by locking the tires with brakes or hand brakes, or pretending that the body will slide in the direction it was heading instead of exactly following the direction of the tires. However, in fact, it is mostly a mixture of the two techniques. For example, the inertial drift of the vehicle body is caused by braking, and then the time and distance of the scoop are extended by using the power sliding tire.

Usually cornering relative to a lack of bite (the way of cornering that maintains the grip of the tire). It is mainly used for performances or when racing through corners. Mainly in cross-country rallying, there are few shots of tail flicks in other racing cars (unless accidental).

Because although the tail flick can pass through the corner faster, the ability to accelerate after leaving the corner will be greatly reduced due to the loss of grip. And tail flicking will bring greater wear and tear to the tire.

The push head is related to the weight of the vehicle. If the front of the car is too heavy, the car will understeer when cornering quickly, which is commonly known as a pusher.

Most family front-wheel drive cars are transversely engined, and the weight of the engine and gearbox of this kind of car is concentrated in the front part, so the front of the family front-wheel drive car is relatively heavy. When the family front-wheel drive car is cornering at high speed, the phenomenon of pushing the head will occur. Also, front-wheel drive itself is not a very reasonable way to drive.

The front wheels of a front-wheel drive car are responsible for both steering and driving the car forward. Rear-wheel drive is a more reasonable way to drive, the rear wheels of a rear-wheel drive car are responsible for driving the car forward, and the front wheels are responsible for steering. Most rear-wheel drive cars also have a scrambled engine on the front of the car, but the engine of a rear-wheel drive car is longitudinal.

The longitudinal engine and transmission also need to be longitudinal, and one of the benefits of the longitudinal engine and gearbox is that the engine and gearbox can be placed as far back as possible, which can balance the weight of the front and rear of the car. So, there are many rear-wheel drive cars with longitudinal engines that have a 50 to 50 front and rear weight ratio.

If the front-to-rear weight ratio of the body reaches 50 to 50, then the car can try to avoid understeer and oversteer when cornering fast, and the body attitude of this kind of car is relatively neutral when cornering quickly. Balancing the car's front and rear weights can improve the car's handling and cornering speed.

The push and tail flick of the car have to start with the steering. Generally speaking, car steering can be divided into low-speed steering and high-speed steering. High-speed steering can be divided into understeering, neutral steering, and oversteering.

When a car with insufficient steering turns a corner, there will be a phenomenon of "pushing the head", which is manifested as the front wheel slipping, losing steering force and rushing to the outside of the corner; The phenomenon of "tail flicking" will occur when the car with too much steering is cornering, which is manifested as the rear wheel skidding, losing grip and pointing to the inside of the corner, causing the body to spin.

So why is there a phenomenon of pushing the head and flicking the tail?

The lateral force that steers the car is actually the force of inertia acting at the center of mass of the car, and its distribution on the front and rear axles is proportional to the weight distribution. The steering characteristics of a car depend on the load on the front and rear axles, which is theoretically defined by an understeering gradient k.

k, is the ratio of the front and rear axle loads to the lateral stiffness, also known as "lateral deviation compliance".

When the lateral deviation of the front axle is greater than that of the rear axle, k>0, at this time, the lateral force makes the front axle produce a large lateral deviation, and the front part of the car slides outward, and the car turns along the outside direction, that is, produces insufficient steering; Conversely, if the lateral deviation of the rear axle is greater than that of the front axle, k<0, the rear of the car will slide outward, and the car will rotate in the inner direction, that is, too much steering.

Although the understeering gradient is derived when the car is steering, it can also be used to reflect the vehicle's response to disturbance when driving in a straight line. It is precisely because of the normal disturbance when driving in a straight line that the car with oversteering characteristics reaches the limit of stability at critical speeds.

Knowing this knowledge, I once again understand why the car should be designed with its own understeer tendency.