In the initial D
BOSS Wentai
The car has been adjusted for several months
The performance of the AE86 is so excellent
p>Changing the driving feel and performance of a car
The first important thing is not the modified parts
It is the adjustment of the four-wheel alignment data
Don't you believe it?
Even Ferrari’s tuning
is not for the best performance
but for
“This is Ferrari”
p>
Trust me
Adjust the four-wheel alignment data well
You will get a good driving experience
As for how it suits you in the end
Then we have to keep working hard
Author?/?Victor
When we mention improving control, what is the first thing we think of?
Change the set of cranks, thicken the anti-roll bar, or add a tower roof, but I think that doing a good four-wheel alignment before touching the hardware may make your car completely different. driving experience.
Today, let us talk about four-wheel alignment.
This issue has been debated for a long time.
In principle, laser is definitely more accurate than cable pulling, but the prerequisite is that the merchant's wheel aligner is regularly maintained and calibrated.
Some friends may ask, why do professional teams use pull wires? After all, the wire drawing machine can be moved around, while the laser wire drawing machine can only be fixed in the store.
However, because it takes longer to pull the wire, the price is generally more expensive, and the technicians are generally more attentive. But if we talk about technology and can find technicians who are attentive, there is no doubt that laser is the faster and better choice.
In the minds of many friends, four-wheel alignment only needs to be done when the car goes off track, but this is not the case. When we are not satisfied with the control of the car, such as pushing the front or tail, the feel of the steering wheel can be adjusted through four-wheel alignment.
This is why when we watch more professional car programs like Top Gear, manufacturers will send technicians there, and a big part of them is to adjust the four-wheel alignment.
When the OEM sets the factory four-wheel alignment, it considers the usage conditions of most owners of this vehicle, which does not necessarily mean it will meet your usage scenario.
A positive example of this is Porsche, which will provide four-wheel alignment data for high-performance driving.
A negative example is Ferrari. The factory four-wheel positioning of high-end supercars such as the 488?pista is entirely to cater to the so-called Ferrari feel, rather than for optimal performance.
This article will tell you how to find a suitable four-wheel alignment for your car.
Every car can have four-wheel alignment, but now many manufacturers will restrict the adjustment of certain data. For example, the inclination of the author's own S3 cannot be adjusted by the original factory. At this time, certain adjustments may be required. Modified to achieve the data we want. OK without further ado, let’s start breaking down four-wheel alignment step by step.
What we are discussing today is to make the car handle better. Generally, we will adjust three parameters - toe angle (toe), camber angle (camber) and caster angle (caster).
Toe angle (Toe)
The toe angle is whether the coaxial tires of the car are parallel when we look from top to bottom. Toe angle is adjustable on almost every car. When the toe angle is 0, the tires are perfectly parallel.
▲?The toe angle value is positive (Toe?in)
The toe angle mainly affects the cornering performance. The smaller the toe angle value, the more sensitive it will be when cornering, and the response to steering will be more sensitive. However, negative toe angles may cause instability, so the original car factory generally comes with some toe angles.
▲?The toe angle value is negative (Toe?out)
If you want to improve oversteer, you can try reducing the toe angle to 0 or even a negative number, and you will have better results. bends and more responsive steering.
When lowering the toe angle, be careful not to adjust it too much at once. If the toe angle is too low, the front wheel may enter the corner too quickly, causing it to lose grip and push the front wheel again. If you want to increase the straight-line stability of your car, you need to increase the toe angle.
Camber
Camber is the inclination of many modified cars we see.
▲?Negative inclination
Not every car has original inclination adjustment. The inclination angle mainly improves the grip during and out of corners.
The inclination angle is generally a negative number. The smaller the number, the more splayed the tire is.
The disadvantage of increasing the inclination angle is that it will increase the wear of one side of the tire in daily driving, but for those who often go to the track, it may help us use the tires more evenly.
▲?Positive inclination angle
We can judge whether we need to increase the inclination angle by observing the wear of the tires. If the wear on the outside of the tire is much higher than that on the inside, it means that the inclination angle needs to be increased, and vice versa. Likewise.
Caster angle (Caste)
The caster angle is generally not adjusted. When replacing the modified swing arm, some brands will increase or decrease this value, which will mainly affect the steering feel and become heavier. Becoming lighter will not be discussed here.
At the end of the article I would like to bring you two cases that can serve as a reference.
Ferrari 488 Pista
The first case comes from Robert Mitchell, who is very famous on the Internet. They operate Ring Taxi (a one-stop car rental service for cow strap running experience). Robert There is a 488 Pista, and he found many problems with the Pista's control.
The original settings of Ferrari are negative toe angle of the front wheel, -0.8 degree of inclination angle, positive toe angle of the rear wheel, and -1.8 degree of inclination angle. This setting gives the Pista an overly sensitive front end, followed by oversteer.
The positive toe angle of the rear wheel and the inclination angle greater than that of the front wheel make the rear of the Pista very stable, further enhancing its head-pushing characteristics. The owner once wanted to sell the Pista, but due to the decline in market prices caused by the epidemic, he finally chose to perform further adjustments.
The owner changed the front wheels to positive toe angles, increasing the inclination angle by 0.8 degrees. Such a simple change gave this Pista a completely different driving experience, and the owner even posted a special post about how much he enjoys driving the Pista on the back of an ox.
Audi S3
The second case is my own S3. My experience and ideas are also applicable to all MQB and front-wheel drive models.
As we all know, the problem of S3 is push. The original S3 front wheel has a positive toe angle and an inclination angle of only -0.5 degrees, and the rear axle also has a positive toe angle and an inclination angle of -1.3 degrees.
The original S3 cannot change the inclination angle. By installing and modifying the front axle on the top of the tower, the inclination angle is increased by -1.4 degrees. I keep the inclination angle of the rear wheels unchanged and set the front and rear toe angles to 0. .
The final result is very obvious. It has excellent cornering and can maintain very high grip in the corner. At the same time, it can make the rear of the car swing flexibly through the escape brake and use the throttle to correct it.
The dynamics of the entire car have become more fun, and the lap speed has also been improved to a certain extent.
I hope this information can help you tune a car that is more suitable for you. For more tuning experience, please feel free to discuss in the message area. More?
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This article comes from the author of Autohome Chejiahao and does not represent the views and positions of Autohome.