Body torsional rigidity table of foreign and domestic cars

Torsional rigidity indicator

Torsional rigidity of the body or LC/c is a value that characterizes the strength characteristics of the automobile frame, its durability and safety. This value has a strong influence on the car’s handling. That is why the world's famous supercars, equipped with carbon fiber and soft lightweight body panels, are distinguished by the highest values ​​of this very parameter. Let's look at the LCD performance of well-known domestic models and compare them with the performance of foreign cars.

Indicators of the Lada Kalina model

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Kalina's car frame is designed taking into account the most important safety regulations. Approximately twelve percent of the body elements on this domestic car are made of high-strength steel. More than half of the iron is coated with zinc. For comparison, for example, on the popular “ten” only 33 percent of the iron was galvanized.

Strength characteristics of the Kalina body

As for LCD/c, Kalina’s indicator is a full twenty percent higher than that of the same “ten”. The PB of the Lada Kalina sedan, even without the use of airbags, has 3 stars out of 5 according to the Euro crash test system.

Despite the large amount of criticism against Kalina, designers and engineers of the domestic car plant regularly make improvements. In particular, if you take a closer look at the second generation Kalina, you will see important points.

For example, what is a successful exterior worth - more solid, aggressive and, of course, attractive. All this was achieved with simple techniques: we raised the hood a little, added more chrome trim and improved the appearance of the optics.

Now, as for the management itself. On the old Kalina, as soon as you turned the steering wheel to the right and left, the car began to roll over, although it retained the straightness of movement. It is not known whether anyone dared to experiment with the steering wheel on bad roads, because this threatened almost a “changeover”.

The new Kalina will definitely not give such a reason, since in addition to increasing the LCD value, a clear adjustment of the steering was carried out. As a result, it has become easier to avoid road irregularities, bumps and holes.

Body and its characteristics

Interesting. The following settings helped make the steering sharper. The “short” rack technology mastered on foreign cars was used, and instead of four turns of the steering wheel, only three were left. And another change concerned more rigid fasteners.

Another fact is noteworthy. Previously, the steering wheel was fixed using rubber bushings. The technology is proven, but clearly outdated. And so AvtoVAZ decided to try, however, only on the left rack support a more rigid fastening method. This immediately bore fruit: the stiffness of the steering system increased by as much as 25 percent!

AvtoVAZ engineers did a good job, also adding a new rear suspension compression buffer. The part has advanced characteristics that reduce roll several times. Coupled with the increased indicators of LCD/c, this gives a powerful effect, and Kalina began to resemble Grant more and more with its confident “steering” and uninterrupted operation of the suspension.

Strengthening and modernization

Strengthening or tuning the body of a VAZ 2109 according to the instructions should be carried out only if the owner is well versed in the design features of the car, has an appropriate understanding of the device, and knows the technical data on weight and other parameters. Otherwise, it is better to entrust the modernization work to professionals at the service station. True, the price of their services in these matters is too high, but you will be satisfied with the result.

So, tuning a VAZ 2109 car is, first of all, upgrading its body. The process always begins with this, and only after that the power unit and other components of the machine are brought to the desired state.

Lada Priora

The next domestic model produced at the Volzhsky Automobile Plant is the Lada Priora. Today it is produced in 4 body variations. The line of models also includes the Priora Coupe - which, however, has not yet gained any popularity among Russians.

Lada Priora

An important parameter of the Priora body, again, is the LCD/c value. It is noteworthy that for the Priora this figure is 12,000 Nm/deg in the sedan version. In other variations, except for the coupe, it is a row lower.

Despite this, there are general indicators for all 3 models, implying body dimensions. Thus, all body types (except coupe) have the same wheelbase, ground clearance and width. As for the length, let us recall that the sedan’s figures are 4350 mm, the hatchback’s are 4,210 mm, and the station wagon’s are 4,340 mm. The heights of the bodies are also different: the sedan is 1420 mm, the hatchback is 1435 mm, and the station wagon is 1508 mm.

Initially, the weak areas of Priora bodies were considered to be the roof, hood and trunk. It is for this reason that experts insist on the mandatory treatment of all internal surfaces of problem areas by the car owner himself with an anticorrosive agent.

Priora body protection against corrosion is provided for 6 years. In practice, this period is determined by: zinc coating of the sills, bottom and arches, as well as the use of low-alloy steel.

Dimensions of Priora

Indeed, practical experience has proven that the Priora body is incredibly resistant to corrosion. If problems start, the first ones at risk are the bumpers, then bubbles form on the paintwork in the winter, and the paint peels off.

The 12 thousand Nm/deg indicator on the Priora sedan is not a large value. Even the VAZ-21106, not to mention foreign cars, has a higher figure. Thus, Priora owners who prefer active driving would do well to strengthen the car’s frame. In particular, strengthening should involve the installation of strut struts and modernization of the SPU on the rear axle.

How to pull out body parts of a “nine” with your own hands

In conclusion of the article I would like to dwell on such a point as body deformation. If the “nine” has any deformed part of the body, then there can be no talk of any tuning until restoration is carried out.

As a rule, complete restoration of the body and elimination of deformations is carried out on a special machine. It's called a slipway. This is professional equipment on which only an experienced and knowledgeable specialist can carry out procedures.

As for restoring the body at home, it must be borne in mind that such an operation is possible only for minor components. Thus, massive body elements, such as a spar or a beam, cannot be pulled out without a slipway. But you can successfully deal with a dented threshold or fender on your own in your garage.

The algorithm for carrying out the work is not very complicated:

• The car is placed on the handbrake, stops are placed under the wheels;
• One of the ends of the cable is tied to a monolithic support, for example, to a large and strong tree;
• The other end is tied to the body part;
• By winding a metal rod around the cable, it becomes possible to gradually tighten the cable.

Lada Granta

Grant body

Grant's liftback is a 3-volume body, implying a successful combination of the luggage compartment lid and the rear window. It is noteworthy that during the Soviet era, liftbacks as such did not exist. There was such a model – IZH-2125 Combi, but it only embodied some of Liftback’s ideas. In fact, such a word was not legalized in the CAS, although such concepts as fastback, phaeton and even breg were found there.

Thus, the Lada Granta Liftback restores historical justice, because in addition to the new name, the car was produced precisely at IAZ, now referred to as OAS.

Note. The Izhevsk Automobile Plant today is more of a branch of the Togliatti enterprise, which does not carry out its own developments.

Liftback is not just a word. So, this type of body looks enviably good in terms of LCD performance. This figure has become twice as high as that of hatchbacks, although less than that of sedans due to design features.

In particular, the difference in design features between a liftback and a sedan lies primarily in the “rear cross member”. The liftback does not have this part at all; it is not provided for, but in sedans it goes behind the back of the rear sofa.

Note. In principle, a cross member could be installed on the liftback, but in this case all the convenience associated with loading into the trunk would disappear. The car would lose half its practicality, which is unacceptable under any circumstances, even for the sake of LCD performance.

Trying to somehow compensate for the loss in the LCD/c, the engineers went to the following. They added amplifiers in some places, thus significantly increasing the figure, and only falling short of the sedan's result.

In addition, due to the introduction of amplifiers, the liftback became 15 kg heavier, and this, in turn, had a negative impact on the torsion indicator.

Ways to increase rigidity

Increasing body rigidity is achieved not only by welding or screwing the frame; there are also less radical methods.

Mounted stiffeners

When a new car is released, the rigidity of its body is also calculated. The manufacturer provides the necessary margin of rigidity, but if the vehicle is not intended for auto racing, then you should not expect miracles from it.

The simplest and most affordable way is to install stiffeners, popularly known as struts or “Struts”. Divided into three types:

In addition, there are a lot of additional amplifiers for specific brands and models of cars: subframes, struts along the sills, on the fenders (kerchiefs), a frame under the bumper - bash bar.

Installing spacers is not a way to prepare a car for racing, except at the amateur level.

Body reinforcement

This is a more advanced way of increasing rigidity, very labor-intensive and financially expensive.

With integrated reinforcement, spot welding areas are additionally scalded. Mounting points for units and particularly loaded areas of the body are reinforced with additional layers of metal. Particular attention is paid to deformation zones specified by the manufacturer. Gussets and jumpers are welded to these places.

However, in order to prepare for participation in professional sports disciplines, installation of a frame will be required.

Car body stiffness table

Of course, torsional rigidity of the body is one of the most important indicators of a modern car. Let's hope that over time, our engineers will come up with more efficient designs and improve the design so that domestic cars occupy the top positions in the ranking of the best cars in the world for this indicator.

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Other ways to strengthen the VAZ 2114

Other ways to strengthen the VAZ 2114 can be considered the installation of reinforced spare parts during repairs. For example, if you are changing the rear springs, then it makes sense to replace them with reinforced ones, but this is usually done if you often have to transport heavy objects. In addition to springs, the car is reinforced with other spare parts:

The reinforced cushion (engine mount) of the VAZ 2114 will allow you to forget about replacement for many years, because it is no secret that standard VAZ 2114 engine mounts do not last long enough.

The same applies to the reinforced VAZ 2114 crabs (brackets), and the reinforced vacuum seal will allow you to forget about replacement for a long time, and the braking system will become more sensitive and reliable. When repairing the clutch, pay attention to the reinforced clutch of the VAZ 2114. The standard factory one does not hold a candle to it.

Many people know that the VAZ 2114’s weak point in the front is the TV. The simplest solution is to install a new Autoproduct subframe. But if you are a welding specialist, making this or a similar subframe with your own hands will not be difficult.

In fact, many components during the repair process can be replaced with reinforced ones, for example, steering tips, ball joints, silent blocks, hoses, CV joints, etc. Before replacing, it’s worth assessing their quality at least based on reviews, since among decent quality they sell a lot of obscene junk that not only will not improve your car, but can also lead to problems on the road or expensive repairs.

Product added to bookmarks!

• Description
• Reviews

APPLICABILITY: VAZ 2108, 2109, 21099, VAZ 2113, 2114, 2115.

Increases body torsional rigidity by 20-25% depending on body type. Significantly improves the driving performance of the car.

Certified, protected by patent.

Tested, approved and allowed for production by AVTOVAZ. Retains VAZ guarantees.

The body amplifier was developed using mathematical modeling specifically to eliminate the effect of “imposing” behavior of these cars. Increasing the rigidity of the body entails improved handling and stability of the car, increased durability of the body and increased passive safety of the car.

When driving in a straight line: – the vehicle’s stability increases, especially at high speeds or when driving on roads with poor quality surfaces;

– the adjustment of the movement trajectory when avoiding irregularities becomes clearer.

When driving in a turn: – the car’s response to turning the steering wheel improves, which gives the driver confidence when driving the car, allowing you to move in turns at a higher speed; – the complexity of driving a car is reduced in comparison with a serial one, since the angle of rotation of the steering wheel decreases when passing turns of the same radii; – the behavior of the car becomes more predictable, which allows the driver to choose different modes and safe driving trajectories;

– the smooth ride of the car is maintained while improving stability and controllability.

The upper connecting bar is removable, which allows you to use a large luggage compartment even with the amplifier installed. It can also be installed on top mounting points.

It is not recommended to install the booster on a car if it only has a rear anti-roll bar installed (i.e. the front stabilizer is left as standard).