How tire size affects fuel consumption. Influence of tires on fuel consumption Car fuel consumption on tire size

How to save on fuel for a car and how tire size affects fuel consumption, an explanation from the experts of the Battery Base and much more useful information for car owners on how to take care of their car. You are always welcome, come and call!

A large number of drivers are planning to install the widest tires with larger landing diameters to improve the visual appearance. vehicle. But few people think about the direct impact of tires on gas mileage during use. The main subject of disagreement is the landing diameter of the tires, as well as their profile width. At the moment, all drivers are divided into two different camps. Some drivers are trying their best to prove to others that by buying smaller tires they could significantly improve the fuel economy of their car.

WHAT ARGUMENTS DO THE DEFENDERS OF THE THEORY HAVE

People who defend the theory offer their arguments that it takes much more effort to turn larger diameter wheels. Based on this, for the processes of starting the ride and accelerating, an increased amount of fuel is needed, however, the average speed will increase by 10-15 kilometers per hour (which will come in handy for fans active driving). Despite the objectivity of the information, it is quite difficult to calculate the exact amount of % increased fuel loss, since it depends on a large number of a wide variety of factors (wheel weight, technical condition of the car, etc.).

The most ardent defenders of the theory are convinced that fuel consumption increases non-linearly, therefore it directly depends on the chosen speed limit. In the process of driving at low speeds, the increased consumption of gasoline will not be significant, but with an increase in speeds of more than 40-50 kilometers per hour, its consumption increases sharply.

ARGUMENTS OF THE SECOND PARTY

In search of the truth about what wheel size affects fuel consumption, most experts resort to science called physics. Due to this, there is a theory according to which minimal fuel losses will cause an increased number of engine revolutions, because the work will be equivalent. Fuel consumption will mainly depend in the literal sense on the mass of the car and aerodynamic braking.

There is a “auto theory” which implies the presence of a special formula by which you can calculate the travel fuel consumption Qs, which makes it possible to neglect the dynamic indicators of the radius. In this case, it is worth considering the applied tire profile height: after all, the greater the profile height, the higher the fuel consumption.

PROFILE WIDTH AND ITS ROLE IN FUEL EFFICIENCY

Most likely, everyone understands that wheels with a wider profile require more gasoline, because the weight of this wheel will be large. Plus, the motor needs increased effort in order to move the car. In addition to weight, the contact patch usually becomes larger, and with it the rolling resistance and acoustic noise.

Greetings, dear motorists and just lovers!
It is customary for all of us to believe that when installing wheels of a larger diameter on our car, we have to throw out a few extra hundreds in exhaust pipe as the pet begins to eat more.
The thought that this is not so does not leave me that day, I know that a lot has been said and retold about this, but now I will try to give my hypothesis about this, I think it will seem to you the nonsense of an inexperienced boy who does not understand anything, but I don’t understand much I understand and don’t know about cars and I’ll ask you the masters of the nut and wrench not to condemn if something is wrong, but to correct it.
Let's take a wheel that rolls along the road for 1 m in one revolution, we find by not cunning calculations that in 100 km it will turn 100,000 times.
Let's take a wheel of a smaller diameter that rolls along the road by 90 cm in one revolution, by the same calculation we find that in 100 km it will turn 111.111 times (the data is slightly rounded) It turns out that at the same distance the wheels of a larger diameter scroll with a lower frequency, respectively, transmission gears and internal combustion engines too.
(Further material from an article from one of the sites) "The speedometer is driven from the transmission by a" flexible shaft "- a special cable that transmits rotation well. Since the same speedometers are on different cars, in their drive they use the simplest gearbox, the gear ratio of which is matched to the car. On a rear-wheel drive, the speedometer usually controls the rotation of the gearbox output shaft. So, the readings depend on the size of the tires, gear ratio gearbox rear axle and the intrinsic error of the device. Example: on a Zhiguli, replacing a pair of 4.44 with 3.9 will change the readings by 14%. In these cases, it is also necessary to replace the speedometer gearbox. However, the gearbox gears are not rubber - therefore, there is no perfect match between the speedometer and the size of the tires, and they still wear out ... The total error of readings up to 10% and even more is a common thing. Often this explains the records of yard racers.
Speedometers front wheel drive vehicles with a transverse engine, they usually “serve” the left wheel drive after the main pair. This means that the effect of rounding the road is added to the speedometer error and the influence of tire size: on turns to the left, the “indicated speed” is slightly less than in the middle of the car, and to the right - a little more. What are the effects of oversized tires? Changing a 175/70R13 tire to a 165/70R13 tire or vice versa changes the speedometer reading by 2.5%"
It is clear from the article that when the tire wears out (that is, when the diameter decreases) and when the wheel moves when turning to the right, when the left wheel goes along the outer radius, the speedometer winds up too much.
How do we measure consumption? (on your car, the wheels are 14) We reset the odometer, drive for example 100 km and look at the fuel arrow readings, let's say it turned out 10 liters, you are happy!
You changed your beautiful shoes to 16 wheels, reset the odometer and drove off, having driven a hundred, you were horrified, your favorite swallowed 13 liters. Your disappointment knows no bounds!
In my opinion, this is an illusion caused by incorrect speedometer readings due to the fact that with a smaller wheel diameter, the speedometer twists real mileage and in order for the odometer to show 100km, you actually need to drive a shorter distance, and with a larger diameter, you actually need to drive a distance exceeding 100km from here and an increased consumption comes out.
If anyone has a desire to check, drive the distance, say, from home to work on the same wheels, change the car and drive along the same path on these wheels (exactly along the same path) and compare the odometer readings, in my opinion the readings will be different.
Once again I ask if something is wrong, if I'm wrong, correct me, but do not criticize, I'm not experienced yet.
Thanks to all!
"We all know from childhood that this and that is impossible, but there will always be an ignoramus who does not believe in it. He makes discoveries." Einstein

30.10.2015

The fuel efficiency of a car depends on many factors. One of the most important properties of tires is the fuel consumed during the movement. Fuel Rating tires are placed on tire labels. The rating is based on the tire's rolling resistance on a scale from A (best performance) to G (worst performance).

Rolling resistance tells us how much friction occurs at the interface between the wheels and the ground. The properties of the tire, which undergoes deformation during driving, have the greatest influence on friction. The consequence of this is the loss of energy in the form of heat. Minimum rolling resistance, ensures less energy consumption. The result is minimal fuel consumption. Rolling resistance is investigated on the basis of strictly defined principles on specially adapted machines. The tests are carried out on the drum at a uniform load and speed that reflect normal operating conditions at temperatures close to 25 degrees Celsius. The results are expressed in kilograms per ton.

The biggest influence on rolling resistance is therefore basically the same tires. Rolling resistance mainly depends on the design of the tire, the rubber components used in the mixture, the internal pressure of the tire, its technical condition, as well as operating conditions. Lighter tires have less rolling resistance, which are characterized by a smaller number and thickness of elements. In addition, the shape of the contact surface of the tire with the road is important, as well as the shape and design of the tread. The increased rigidity of the tire makes it less deformable. This results in lower rolling resistance, resulting in lower fuel consumption.

All the largest producers tires are constantly working on new technologies that reduce rolling resistance. One of the many examples of innovative solutions can be a mixture created by the Japanese concern Yokohama. It uses compounds of polymer and finely dispersed silicon dioxide with the addition of essential oils from orange peel. The goal of Japanese engineers is to find environmentally friendly solutions that will reduce the share of petroleum products in the production of tires. The result is a compound that reduces rolling resistance by 20 percent compared to a conventional compound without losing adequate grip and wear resistance.

High rolling resistance, may be caused by insufficient tire pressure. It increases sag and less stability of the tread blocks in contact with the road. Pressure below 1 bar of the recommended level causes more rolling resistance by about 30 percent. The consequence of this is an increase in fuel consumption. Tire manufacturers use various methods to prevent air infiltration. Yokohama uses a special paper-thick insert. It is made of elastic rubber and original plastic, which reduces air loss by 36 percent.

The resistance difference between the highest and lowest energy efficiency class is 5.5 kg/t. In practice, a class A tire, especially on long routes, heats up to a lesser extent. The result is lower fuel consumption, even up to 7.5 percent. In terms of this, this is about 6 liters of fuel for every 1000 km. However, we must not forget that fuel efficiency is also influenced by vehicle parameters: body type, engine size, use of air conditioning and even driving style. Due to these factors, fuel consumption (with tires of the same class) may vary. Provided that an average driver drives an average of 35 thousand kilometers a year, he can save up to 200 liters of fuel.

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Volga's donors were Volvo 940 and Toyota 2JZ-GE.

It all started with the fact that a young guy bought a used GAZ-24 and first put it in order. After driving the car for three years, the young car owner decided to do the tuning of his car on his own in order to turn it into a more modern design.

The tuning project started with the replacement of the suspension and the replacement of the rear of the Volga with the “stern” from the Volvo 940. The hood was also reworked. Next came the turn to change the engine under the hood. The owner of the car placed a 230-horsepower 3-liter engine from Toyota 2JZ-GE in place of the old engine, paired with automatic transmission transmissions from the "Japanese".

After changing the technical part, the motorist came to grips with body work. The roof was lowered, like American muscle cars of the 70s, then the 4-door sedan turned into a 2-door coupe. A new body kit appeared in the form of custom bumpers and wheel arches, new optics and other body elements that the author of the project developed himself.

And finally were replaced wheel disks, after which the Volga sparkled with new colors.

The opinions of netizens about the tuning project were divided. I liked one result very much, others noted that the car still looks like a “collective farm”, what don’t you do with it

The experts spoke about the correct actions of the driver when the traffic police officer asks: “Why are we violating”?

Within the territory of Russian Federation you can often find the phrase popular among inspectors: “Why are we violating”? However, it does not always mean that the driver really broke some law.

In case of a really committed violation, the traffic police officer draws up a special protocol, in which all information about the composition of the violation, the date, as well as the signatures of both parties, including full agreement with the described circumstances of the crime, are entered. The latter is done so that the driver cannot later appeal the fact or absence of a violation in court.

But Russian motorists they rarely start disputes with traffic police officers, so they agree to sign and pay for everything. At the same time, most of the “recorded violations” were not actually committed, so they can be challenged in court. Basically, drivers agree to sign protocols after a small mental attack, which is often practiced by patrolmen. For example, a standard question: “Why are we violating”?

This very question immediately puts the motorist in an uncomfortable position, who begins to think what he managed to violate, but in the end everything ends up looking for excuses, even if there was no violation.

Selling Korean-made cars Hyundai Solaris on the secondary market, motorists can bail out up to 90% of the original price. The Volvo V40 leads the premium segment Cross Country, whose sellers receive 88% of the resale. Also, owners of Korean Kia car Soul, receiving 87% of the original price.

Closes the top three japanese crossover Mazda CX-5, whose owners, having decided to sell the car, can get 86.5% of the starting price by selling the car on the secondary market.

The most unprofitable in terms of resale are: BMW, VAZ UAZ and Peugeot, as they quickly lose value, and, accordingly, selling them on the secondary market is much cheaper compared to the original price.

To improve appearance cars, drivers put extremely large tires with a large landing diameter. Meanwhile, few car owners have thought about how tire size will affect fuel consumption during operation. A key topic in disputes between car owners is the discussion of the inner diameter of the tire and the height of the profile.

Today, the debate over the effect of tire size on fuel consumption has divided car owners into two opposing groups. Half of drivers prove to others that buying smaller tires will save on fuel.

Arguments of supporters of this theory

Proponents of the theory argue their position by the fact that when a wheel with a larger diameter rotates, more effort is required. According to such statements, in order to move the car, more fuel will be required, its average speed will increase by 10-15 km / h. Calculating the percentage of increased fuel consumption is quite problematic, because the result will depend on many indicators: wheel weight, road surface condition, weather conditions.

Proponents of the theory argue that fuel consumption can grow non-linearly and depends on the speed selected by the driver. At low speeds, the percentage increase in fuel consumption will be imperceptible, while when driving more than 40-50 km / h, fuel consumption will begin to increase.

Arguments of opponents

In search of the truth, many experts use scientific facts and the laws of physics. There is an opinion that slight losses of fuel can cause an increase in the number of revolutions of the engine. Opponents argue that the main factor affecting fuel consumption is total weight vehicle and aerodynamic performance during braking.

Many drivers are familiar with the "car theory", which is a mathematical formula. Using the formula, the level of fuel consumption Q s is calculated, which makes it possible to neglect the dynamics indicators. During the calculation, the profile height of the tire is taken into account, the larger it is, the higher the fuel consumption.

The role of profile width in the theory of fuel costs

Obviously, wheels with a wide profile have more fuel costs, because their mass is higher. The motor needs to apply more force to start the car moving. The higher the mass of the car, the larger the contact patch of the wheel, which means that the rolling resistance and acoustic comfort increase.