Two days ago, a good brother suddenly found Tai Ge and said that he wanted to modify it, and it was best to have a significant improvement in the control reaction, without the trouble of disassembling and changing parts, without scalper inspection.
That's particularly simple, Tiger recommends that he change a set of lightweight wheels on it, why say that the wheel changer can be controlled significantly better, here to say a concept called "spring mass".
Modification is actually very simple to start with "unsprung quality", and it is certainly true
The under-spring mass is actually these parts in the wheel arch:
The components that generally belong to the under-spring mass are: springs, shock absorbers, up and down swing arms, half shafts, steering tie rods, connecting rods, brake calipers, brake discs, horns, tires, wheel hubs and so on.
Effect of unsprung mass on the vehicle:
We all know that 100-meter athletes wear ultra-light running shoes to reduce unnecessary consumption when athletes swing their legs. In the same way, the smaller the under-spring mass, the inertia of the wheel during acceleration and the impulse when bouncing can be reduced, and the inertia force when steering will be reduced, and the maneuverability and comfort can be improved.
In the case of a car without considering other factors, from the analysis of the reed mass and the under-spring mass on the impact of the vehicle's handling, comfort and acceleration performance, it is concluded that the greater the ratio of the reed mass to the unsprung mass, the performance of all aspects will tend to be more excellent.
For a simple example, there is a spring with a large ball (on-spring mass) and a small ball (sub-spring mass) at each end, and if the large ball is much heavier than the small ball, the vibration of the small ball has a very slight impact on the large ball, (comfort is very good). Conversely, the heavier the ball, the more obvious the vibration has on the ball (the vibration sensation of the body will be more obvious). Therefore, in order to make the performance of all aspects of the vehicle excellent, reducing the quality under the spring is the direction that everyone pursues. So what is the specific impact of reducing the unsprung mass on the performance of the vehicle? How can we reduce the under-spring mass? Tiger continued to introduce the analysis to everyone.
It's not the bigger rims that have flatter tires that are best
Most car owners will replace the larger diameter rims in the first step, and at the same time, they can bring a good visual effect by matching the tires with low flat ratio. However, it invisibly increases the weight of the entire tire, and it will definitely weaken the shock absorption ability of the tire. Therefore, when replacing the rim, Tiger does not recommend adding too much, and appropriately increasing 1-2 inches can be. Replace with a larger size rim, but also consider not to increase the weight, structurally reduced banner, the use of lighter materials are a good way.
In addition to the rim, lightweight braking systems are also required, such as replacing lightweight brake kits, large vent brake discs, and upgrading single-piston calipers to multi-piston calipers.
For an idealized suspension system, in fact, reducing the quality of the spring is far more than that, under the condition of ensuring an excellent geometric suspension structure, other components such as support springs (short springs), titanium alloy shock cylinders, titanium alloy and carbon fiber swing arms, chrome-nickel alloy transverse anti-roll rods, etc. can also use lightweight kits.
Effect on comfort:
Although many cars are limited by cost, they still reduce the under-spring mass as much as possible, not only for better handling and acceleration, but also for improved ride comfort and fuel economy.
Vehicle comfort is mainly due to the ability to absorb shocks, and the wheels continuously absorb shocks from the ground due to suspension, improving vehicle stability. The mechanical structure of the suspension can improve the shock absorption ability, increase the ratio of the mass above the spring to the bottom of the spring, and also achieve a more ideal effect.
Larger under-spring masses, with greater motion inertia, extend the time it takes for the wheels to respond to road vibrations back and forth. In real life, it can be found that a fully loaded vehicle will have better driving smoothness than when it is unloaded. This is actually to expand the proportion of spring load mass, other parameters remain unchanged, increase the proportion of spring mass to make the vehicle more comfortable.
To sum up
Changing to a lighter tire doesn't necessarily save fuel. The focus is on reducing the under-spring mass to improve comfort, and the handling and acceleration performance can also be improved. For friends who are keen on modification, reducing the quality of the spring is the most basic and complex part, which is knowledgeable, and Tiger still recommends that the masters consult the modification technician specifically to comprehensively adjust the best.