Many of you have heard about the existence of engines reinforced with two turbines. Of course, such power units are available only to a select few due to their high cost, but still, if not purchased, then at least each of us has the right to inquire. Have you ever wondered how Twin-Turbo differs from Bi-Turbo, because at first glance, you might think that they are the same thing - an engine equipped with two turbines. Let's go a little deeper into specifications and we'll figure out what's what.

Some people mistakenly believe that Twin-Turbo And - these are different commercial names for one supercharging system. We assure you that the difference is not only in the company, but also in the method of supercharging.

Engines with Twin-Turbo supercharging system

Let's imagine how a turbine operates. It creates a certain air pressure pumped into the engine cylinders. As the speed increases, the efficiency of the turbine decreases and the engine power decreases. To eliminate a drop in power and ensure an increase even by high speed, a second similar turbine was installed.

It is noteworthy that turbines can come into operation in different ways. For example, you can configure the turbines so that they operate in parallel, or it is possible to configure it so that first one turbine pumps up pressure, then, when its power becomes insufficient, the second one is connected and thus compensates for the loss.

It is worth remembering that the Twin-Turbo supercharging system can be installed on both V-engines and in-line engines, there is not much difference here.

Engines with Bi-Turbo system

Bi-Turbo also implies the presence of two turbines, however, if in the previous version the turbines were the same, then Bi-turbo includes the presence of a regular turbine and an enlarged, more powerful one. They have a sequential switching method, that is, the first turbine operates at low and medium speeds, and the increased one operates at high speeds. This configuration ensures smooth acceleration of the vehicle.

In turn, Bi-Turbo can also be installed on both V-shaped and in-line engines.

Difference in operation of Bi-Turbo from Twin-Turbo

So, design features each of the systems influenced the overall behavior of the car. If the Bi-Turbo system, thanks to the use of turbines of different power, provides the car with uniform acceleration, without loss or sharp increase in power, then the main priority of Twin-Turbo is to extract maximum power from the engine. Twin-Turbo, unlike its competitor, still suffers from the so-called turbo lag, i.e. a slight delay until the turbine spins up and gives a boost. This results in a sharp push in acceleration; with the Bi-Turbo system, acceleration occurs smoothly.

A car is a mechanism that makes a person’s life much easier, saves time and provides a certain comfort. Modern cars can have completely different purposes and modifications. For fans of sports cars and similar power plants, manufacturers produce units with powerful engines. These include engines with Twin-Turbo and Bi-Turbo turbocharging types.

What is the Twin-Turbo system?

The turbine operates in a certain way. Air from outside the car is forced and pumped into the engine cylinders. But, after the engine speed increases, the turbine operation loses its efficiency. To eliminate this peculiarity of turbine operation, the developers designed a system consisting of two turbines.

The turbines can operate in a mode individually selected by the car owner. They can work both in parallel and sequentially. In the second case, one turbine is connected at the moment the engine starts and speed increases, and the second is connected at the moment the effective operation of the first decreases. Working together, in turn, provides a huge increase in performance and engine performance.

The Twin-Turbo system can work and be installed on V-type engines, in-line engines are also suitable, there is no particular difference in this fact. The main purpose of such an installation is to increase vehicle performance and quickly gain speed.

The system has a certain list of disadvantages:

1. Long response to the accelerator pedal.
2. Increased operation of the second, more powerful turbine and its premature wear.
3. The presence of turbo lag, a condition in which the turbines are ineffective.

On car models that participate in racing or drag racing, 3-5 turbines are often installed according to the above scheme. The automotive industry does not provide such “excesses” for production cars.

Bi-Turbo system

A similar system refers to a technique for improving a turbine by installing another one. In a Bi-Turbo system, one turbine is significantly larger and more powerful than the other. They can only be connected in series. At low and low engine speeds, the first turbine starts working, and after increasing pressure on the accelerator pedal, the second one turns on.

At low loads, the turbine that has weak power operates; at increased speeds, the powerful one comes into operation. Due to this algorithm, the car operates without failures and loss of power while driving.

Bi-Turbo can be installed on V-twin and in-line type engines. In addition to the positive effect of working on the engine, the installation can also have unpleasant moments. First and foremost, not many people can afford it due to its high cost. The second is complex commissioning and installation work. They are quite specific and require equipment, tools and a knowledgeable craftsman. Most often, the installation can be found on expensive supercars from famous world manufacturers.

What is the difference between Twin-Turbo and Bi-Turbo?

Both units are designed to improve the efficiency and performance of a vehicle's engine under load conditions. In addition, they both consist of two turbines that are installed directly in the engine compartment of the car.

The Bi-Turbo system is considered better than its Twin-Turbo counterpart. Its design includes two turbines, which have different size and power parameters. They provide the car with an advantage in a uniform increase in speed, without loss of power and the appearance of “dips.” The main hyperfunction of Bi-Turbo is its smooth operation and excellent start without jerks or delays. The system can be used on cars intended for city driving.

A Twin-Turbo installation is a system of two turbines of the same size and power. The clear advantage is that synchronous work turbines ensure that maximum potential and power are extracted from the car’s engine. A negative quality is considered to be the presence of a turbo lag, the so-called failure, which occurs due to failures and delays on the part of the accelerator pedal. Similar nuances are expressed in high-speed driving mode. The driver feels a sharp jolt when starting and when changing gears.

The concept and principle of operation of a turbocharging system called Twin Turbo. Photos of the new turbocharged Biturbo engine, video and diagrams.

What is it and how does it work?

Twin Turbo translated from English means double turbo and in this turbocharging system there are two turbochargers. At first, turbochargers were used to overcome system inertia. Nowadays, the use and application of these turbochargers has increased significantly as it reduces fuel consumption. Power output increases and helps maintain rated torque over a wide engine speed range.

Types of Twin Turbo and their differences

There are three types of Twin Turbo system designs: series, parallel, and stage. These three schemes differ from each other in the location, characteristics and operating sequence of the turbochargers. The electronic control system very precisely adjusts the operation of the turbochargers. The system includes input sensors, air flow and processed fuel control valve drives.

The trade label for the turbocharging system is Twin Turbo, but there is another name for this system - “Biturbo”. It is not entirely correct that various information sources perceive Biturbo as a system with a parallel circuit for the operation of a turbocharger.

Video: how the turbine works:

1. Parallel Twin Turbo or Biturbo

The Twin Turbo Parallel system operates simultaneously and parallel to each other, and includes two identical turbochargers. Parallel operation occurs due to the even division of the flow of burnt gases between the turbochargers. Compressed air leaves each compressor and enters a common intake manifold, and is then distributed among the cylinders. Parallel Twin Turbo is used, as a rule, on diesel V-engines. Due to the parallel turbocharging design, the efficiency of the system is based on the fact that two small turbines have less inertia than one large turbine. Turbochargers operate at all engine speeds providing a rapid increase in boost. And each turbine is installed on its own exhaust manifold.

In a sequential Twin Turbo system, the first turbocharger is constantly running, and the second one starts working in a certain order of engine operation (increased speed, load). A sequential turbocharger consists of two turbochargers with identical characteristics.

The electronic control system ensures the transition between modes and regulates the flow of burnt gases to the second turbocharger using a special valve. It is correct to call such a system sequential - parallel, because when the control valve for the supply of burnt gases is fully open, both turbochargers operate in parallel. Compressed air is supplied to a common intake manifold from two turbochargers and distributed among the cylinders.

To achieve the highest possible power output, the Twin Turbo sequencing system minimizes the effects of turbo lag. They are used on both diesel and gasoline engines. In 2011, a system with three sequential turbochargers was introduced by BMW and it is called Triple Turbo.

In technical terms, the two-stage turbocharging system is the most advanced. BorgWarner Turbo Systems installs this system on Cummins and BMW diesel engines, and since 2004 they began using a two-stage turbocharging system on some Opel diesel engines.

The two-stage turbocharging system uses valve control of the flow of burnt gases and charged air. This system consists of two turbochargers of different sizes. Subsequently installed in the intake and exhaust tracts.

The combustion gas bypass valve is closed at low engine speeds. The burned gases pass through the small turbocharger, having maximum efficiency and minimum inertia, further through the large turbocharger. And since the exhaust gas pressure is not strong, therefore the large turbine practically does not rotate. The boost bypass valve is closed at the inlet and air flows sequentially through the large and small compressors.

The general operation of turbochargers begins to occur as the speed increases. And gradually the bypass valve of the burnt gases begins to open. The large turbine begins to spin more and more intensively, as part of the exhaust gases goes directly through it.

The large compressor at the inlet with a certain pressure begins to compress the air, but the pressure is not too high and the compressed air then flows into the small compressor, where the pressure continues to increase. In this case, the bypass valve remains closed. The combustion gas bypass valve opens fully at full load. The small turbine stops, and the large one begins to spin up to maximum frequency, since burnt gases almost completely pass through it. The boost pressure reaches its maximum value at the inlet of the large compressor, while the small compressor interferes with the air. And at a certain moment, the boost bypass valve opens and compressed air flows directly to the engine.

Thanks to the Twin Turbo system's two-stage turbochargers, rated torque is instantly achieved and maintained over a wide engine speed range. This achieves the maximum increase in power. Thus, the system maintains excellent performance of turbochargers in all engine operating modes. The system also explains the well-known confrontation diesel engines between extreme power at high revs and high torque at low revs.

Video about Twin Turbo: how it works

Twinturbo and biturbo, what is the difference and what are the differences?

You have heard the names twinturbo and biturbo more than once, but what is the difference? But there really is no difference! Twin-Turbo and Bi-Turbo are everything marketing gimmicks and different names for the same turbocharging system. By the way, read the useful article by Kostya Neklyudin about the pros and cons of various turbocharging systems

Contrary to the beliefs of some “experts,” the name of the biturbo or twin-turbo system does not reflect the turbine operation pattern - parallel or sequential (sequential).

For example, at Mitsubishi car 3000 VR-4 turbocharging system is called TwinTurbo. The car has a V6 engine and has two turbines, each of which uses the energy of exhaust gases from its three cylinders, but they blow into one common intake manifold. For example, German cars have systems similar in operating principle, but they are called not twinturbo, but BiTurbo.

On Toyota car The inline-six Supra has two turbos, the turbocharging system is called TwinTurbo, but they operate in a special sequence, switched on and off using special wastegate valves. The Subaru B4 also has two turbines, but they work sequentially: at low speeds a small turbine blows, and at high speeds, when it can’t cope, the second turbine is connected bigger size.

Let’s now take a look at both bi-turbo and twin-turbo systems in order, or rather, what they write about them on “these Internets of yours”:

Bi-turbo (biturbo) is a turbocharging system consisting of two turbines connected in series. A biturbo system uses two turbines, one small and one larger. A small turbine spins up faster, but at high engine speeds, a small turbine cannot cope with compressing the air and creating the required pressure. Then a large turbine is connected, adding a powerful charge of compressed air. Consequently, the delay (or turbo lag) is minimized and smooth acceleration dynamics are formed. Biturbo systems are not a cheap pleasure and are usually installed on high-class cars.

The biturbo system can be installed as on a V6 engine, where each turbine will be installed on its own side, but with a common intake. Either on an in-line engine, where the turbine is installed in cylinders (for example, 2 for a small and 2 for a large turbine), or sequentially, when a large pipe is first installed on the exhaust manifold, and then a small one.

Twin-turbo (twinturbo) – this system differs from bi-turbo in that it is aimed not at reducing turbo lag or leveling out acceleration dynamics, but at increasing performance. Twinturbo systems use two identical turbines, therefore the performance of such a turbocharging system is more efficient than systems with a single turbine. In addition, if you use 2 small turbines, similar in performance to one large one, you can reduce unwanted turbo lag. But this does not mean that no one uses two large turbines. For example, a serious dredge might use two large turbines for even greater performance. The twin-turbo system can work on both V-shaped and in-line engines. The turbine activation sequence may vary, as on biturbo systems.

In general, for even more fun, no one is stopping you from plugging in 3 (!) turbines or more at once. The goal is the same as for twin-turbo. I should note that this is often used in drag racing and never on production cars.

By the way, read the useful article by Kostya Neklyudin about the pros and cons of various turbocharging systems

Do you like turbos or do you have a turbocharged car? Then join our group!

On modern cars Turbocharging is often used - it allows you to increase engine power by increasing the amount of fuel injected into the cylinder in one cycle. Since the middle of the 20th century, there have been cars that use two turbines at once - this arrangement is called Twinturbo, Biturbo, Double Turbo and other words. You can often find information about the fundamental differences between Twinturbo and Biturbo - separate articles provide definitions and the essence of unique structural elements. Let's try to understand the layout of these systems.

Turbocharging is increasingly being used to increase engine power.

The most interesting point in this problem is that there are no fundamental differences. Biturbo and its counterpart Twinturbo are simply alternative names for identical charging systems with two compressors. Moreover, both Biturbo and Twinturbo involve the use various variations technical part.

Various names were invented by marketers of famous automobile manufacturers to distinguish their products from the many similar cars built using the same layout. It is interesting that the Japanese prefer their twin turbochargers Twinturbo, while European companies write Biturbo - this is how it happened historically. Cars come to our country from both parts of the world, so both the name Biturbo and Twinturbo are familiar to domestic consumers. Therefore, the debate about the differences between the names of turbochargers can be considered unfounded - but it will be interesting to learn about the fundamentally different systems used in international practice.

If you know what turbocharging is, you will understand that installing two turbochargers has its own challenges. Both turbines of the Biturbo system have to be installed on the same exhaust pipe, and a certain distance must be maintained between them. The problem is that the distant turbocharger will receive less energy and will not operate as efficiently. In the middle of the 20th century, this problem was solved quite simply - the second turbine in the Twinturbo layout had different bearing characteristics and impeller shape. Due to this, it was possible to synchronize the operation of the two units and significantly increase engine power using the Biturbo system.

Biturbo system is used less and less

However, practice has shown that the sequential Twinturbo layout has several important disadvantages:

• The presence of a serious “turbo lag”, that is, a speed range in which the turbines simply do not work;
• Quite a long response time to gas supply;
• Accelerated wear of the nearby turbine;
• Inconvenient installation on V-shaped engines.

They tried to solve the problem different ways. However, the most elegant and effective engineering solution was offered by Toyota, which included turbochargers in its Biturbo variant. At low speeds, the valves are closed and exhaust gases pass only through the small first turbine, easily spinning it and providing an early exit from the turbo lag. After reaching 3500 rpm, when the gas pressure already becomes excessive, the electronics open a special damper and the hot flow rushes to a second larger turbocharger, providing a significant increase in engine power.

However, with the massive spread of V-shaped engines, the sequential Biturbo system began to be used less and less, since it was inconvenient to use from a design point of view. Around the beginning of the 80s, an alternative Twinturbo layout was proposed, in which each turbine was assigned to several engine cylinders - as a rule, we were talking about one or another “half” of the block. Turbochargers could be located much closer to the intake and exhaust manifolds, which significantly reduced the level of mechanical and aerodynamic losses, and also increased engine power. In addition, the parallel Biturbo system, using compact turbines, made it possible to get rid of “turbo lag” and make the engine very sensitive to changes in fuel supply.

In most cases, the parallel Twin Turbo design involves the use of a common intake manifold, which simplifies it and makes it less expensive to maintain, but limits the dynamic potential of the car. Therefore, a Biturbo layout with separate intake tracts and manifolds was proposed as an alternative. Among other things, this made it possible to adapt the system for use on compact in-line engines, which were previously equipped exclusively with two turbochargers arranged in series.

However, the most interesting Twinturbo scheme was proposed by BMW - its difference was in the location of the turbines in the V8 camber, and not on the sides of the cylinder block. Moreover, each of the turbochargers was powered by cylinders located on both sides of the engine! Despite the enormous difficulties that the engineers had to overcome, the result exceeded all expectations. This original Biturbo system reduced the length of the “turbo lag” by 40% without reducing the reliability of the unit. In addition, the stability of the engine has significantly increased and the intensity of its vibrations has decreased.

Sometimes the Twinscroll turbine is confused with the Twinturbo layout. The latter involves the use of one turbine having two channels and two sections of the impeller with different blade shapes. At low speeds, a valve leading to a smaller impeller opens - as a result, the turbocharger accelerates quite quickly and provides an increase in power without “turbo lag”. However, as the crankshaft speed increases, the exhaust gas pressure becomes excessive and a second valve opens - now only the large impeller is used. As a result, the car receives an additional increase in performance.

Of course, such a system is somewhat less efficient than the classic Biturbo. However, in comparison with a single turbine, the traction capabilities of the engine still increase. Of course, the Twinscroll layout is difficult to manufacture and is considered quite unreliable. However, nowadays it is very often used in powerful cars - including as part of the Biturbo system.

If you know the difference between a mechanical compressor and a turbine, you will understand why these two systems are considered incompatible - the first is driven by the crankshaft, while a turbocharger uses the energy of exhaust gases and it is almost impossible to combine them. However, nothing is impossible for Volkswagen engineers - they included both units in their version of the Twinturbo system. The turbine works constantly, while the compressor helps eliminate turbo lag at low speeds. Subsequently, it turns off, but when the gas pedal is pressed sharply, it comes into effect again, improving the engine's response to fuel supply.

The result of using this Biturbo variant was a significant increase in power, reaching the torque limit at low speeds, accelerating the acceleration, as well as reducing the response time to pressing the gas pedal. The difference with a simple Twinturbo is almost invisible to the driver - he only feels the easily predictable powerful dynamics and is not distracted by power failures or other problems. However, the system developed by Volkswagen turned out to be very difficult to manufacture and unreliable. Therefore, at present, cars of brands included in the group of companies use only one of two supercharging options.

Summarizing the above, we can conclude that the differences between Twinturbo and Biturbo are only in the name. If you are really interested in different supercharging systems, you should pay attention to parallel and sequential layouts. In addition, it would be useful to become more familiar with the differences between a turbocharger and mechanical supercharging and the advantages of their combined use.

How do Biturbo and Twin Turbo engines work in cars?

Literally translated from English, the phrase twin-turbo means “double turbo” or “double turbo”. Both translations are correct. Now let's leave the linguistic aspect and study in detail the technical side of this type of turbocharging.

In order to achieve a noticeable increase in engine power, a turbine is installed in its design. Twin-Turbo is one of the types of car turbo systems and it is on this that we will focus our attention. Twin turbo involves installing two identical turbines at once, which greatly increase the performance of the entire turbocharging system. This arrangement is much more efficient than a turbo system, which uses only one turbine.

Initially, the biturbo was designed to solve the main problem of all inflatable engines - eliminating the so-called “turbo lag”. This phenomenon manifests itself in a decrease in elasticity and a sharp drop in engine power at low speeds. All this happens at a time when the engine turbine, under exhaust gas pressure, does not have time to spin up to optimal speed.

It was subsequently observed that twin turbines allow a significant expansion of the rated torque range, thereby increasing maximum power while reducing overall fuel consumption.

Did you know? The exclusive Bugatti Veyron supercar is equipped with four turbines at once, and this turbocharging system is appropriately called Quad-Turbo.

There are several main types of Twin-Turbo systems: parallel, sequential and staged. Each type of turbocharging is characterized by its own geometry, operating principle and produced dynamic characteristics.

This is a relatively simple type of turbo system, the design of which includes a symmetrical pair of compressors operating simultaneously. Thanks to this synchronization, an even distribution of incoming air is achieved.

This scheme is often used in V-shaped diesel engines, where each compressor is responsible for supplying air to the intake manifold of its own group of cylinders.

Reducing inertia is achieved by reducing the mass of the turbine rotor, since 2 small compressors create more pressure, spinning up much faster than one large and more efficient compressor. As a result, the turbo lag mentioned above is significantly reduced, and the engine produces better performance throughout the entire speed range.

This type implies an arrangement consisting of two comparable compressors, which may have different characteristics and operate in a complementary mode. The lighter, faster supercharger operates continuously, eliminating deep and wide turbo lag. The second supercharger, using special electronic signals, controls engine speed and turns on under more severe engine operating conditions, thus providing maximum power and fuel efficiency.

At peak engine operating conditions, 2 turbines are switched on at once, working in pairs. A similar scheme can be used on engines with any fuel cycle.

The most complex and advanced type of turbocharging, providing the widest power range. Creating the necessary boost becomes possible thanks to the installation of two compressors of different sizes, connected to each other by a special system of bypass valves and pipes.

This type of turbocharging is called staged turbocharging due to the fact that exhaust gases spin a small turbine at minimum speeds, and this allows the engine to easily gain speed and operate with greater efficiency. As the speed increases, the valve opens, which in turn drives a large turbine. But the pressure it creates needs to be increased, which is what a small turbine does.

After reaching maximum speed, the large turbine produces enormous pressure, which turns the small supercharger into aerodynamic drag. At this very moment, the automation opens the bypass valve, and compressed air enters the engine, bypassing a small turbine on its way.

But all the complexity of this system is fully compensated by the flexibility of the engine and its highest characteristics.

What are the advantages of using Twin-Turbo and are there any disadvantages?

The undoubted advantage of the Twin Turbo system is high power with a relatively small engine displacement. This also includes high torque and excellent dynamics of a car equipped with Twin-Turbo. A twin-turbo engine is much cleaner than a conventional engine because turbocharging allows the fuel to burn much more efficiently in the cylinder system.

Among the disadvantages of a biturbo, one can highlight the difficulty of operating such a system. The power plant becomes more sensitive to fuel quality and motor oil. Turbocharged engines require special oil, since without it the service life of the oil filter is noticeably reduced. High temperatures, in which turbines operate have a negative impact on the entire car engine.

The main disadvantage of the Twin-Turbo system is its high fuel consumption. To create a fuel-air mixture in the cylinders, a large volume of air is required, which entails an increase in the fuel supply.

Turbines wear out quite quickly if you immediately turn off the engine when stopping the car. To extend the life of the Twin-Turbo, let the engine run for a while. idle speed, thus cooling the turbines, and only after that can you safely take out the ignition key.

Remember! Twin-Turbo is a complex and highly sensitive turbocharging system that requires careful attitude and quality components. Following these simple rules allows you to enjoy the speed and dynamics of your car as much as possible.

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Bi-turbo (Bi-Turbo) and Twin-turbo (Twin-Turbo), double supercharging - differences. So are they different or not?

Turbocharged engines are not as simple as they seem; there are many misunderstandings and uncertainties surrounding this topic. One of these is about two structures: “bi-turbo” and “twin-turbo”. Not long ago I personally witnessed a conversation between two car owners, one assured that there was a difference, but the other that there was no difference! So what is the truth? Indeed, how do these two structures of TURBO engines differ, let’s figure it out...

To be honest, of course there will be a difference, but it will not be categorical! Only because the names are taken from different manufacturers who install their units with different layouts and structures.

However, the “Bi-turbo” and “Twi-nturbo” systems are essentially the same thing. If you take English language and look at the designation, Bi-Turbo and Twin-Turbo, you can see two prefixes “Bi” and “Twin” - roughly translated it turns out to be “TWO” or “TWO”. Nothing more than a designation for the presence of two turbines on an engine, and both names can be applied to the same engine, that is, they are absolutely interchangeable. These names do not carry any technical differences, so this is “naked marketing”.

Now the question may arise: why? It’s simple, there are only two questions that they are designed to solve:

• Eliminating turbo lag, we can say that this is a priority problem.
• Increased power.
• Engine structure.

I’ll start, perhaps, with the simplest point - the structure of the engine. Of course, it's easy to install one turbo when you have a 4 or 6 cylinder in-line engine. There is only one muffler. But what to do when you have, say, a V-shaped engine? And three to four cylinders on each side, then there are two mufflers! So they put a turbine of medium or low power on each one.

Eliminating turbo lag - as I already wrote above, this is task number “1”. The thing is that a turbocharged engine has a failure - when you press the gas, the exhaust gases need to pass through and spin the turbine impeller, it is this time that the power “sags”, it can be from 2 to 3 seconds! And if you need to make an overtaking maneuver at speed, it’s not safe! So they install various turbines, and often a compressor + turbine. One works at low speeds, that is, at the start, to avoid “turbo lag”, the second – at speed when you need to leave traction.

Increasing power is the most commonplace case. That is, to increase the engine power, another powerful one is installed to a low-power turbine, so there are two of them blowing, which significantly increases productivity. By the way, some racing cars have three or even four turbines, but this is very complicated and, as a rule, does not go into production!

These are actually the solutions for which “TWINTURBO” or “BITURBO” are used, and you know, this is really the way out for getting rid of turbo lag and increasing power.

Nowadays, many cars use only two main structures - the arrangement of two turbines. These are parallel and sequential (also known as sequential).

For example, some Mitsubishi have “TWINTURBO”, but parallel operation, as I noted above, means two turbines on a V6 unit, one on each side. They blow into a common collector. But for example, on some AUDIs, there is also parallel operation on the V6 engine, but the name is “BITURBO”.

Toyota cars, in particular the SUPRA, have an in-line six, but there are also two superchargers - they work in a tricky order, two can work at once, one can work, the other doesn’t, they can turn on alternately. It all depends on your driving style - this work is achieved with “tricky” bypass valves. Here's serial-parallel work for you.

As on some SUBARU cars - the first (small) pumps air at low speeds, the second (large) is connected only when the speed has increased significantly, here you have a parallel connection.

So is there still a difference or are there no differences at all? You know, behind the scenes, manufacturers still distinguish these two buildings, let’s go into more detail.

As a rule, these are two turbines connected in series. A striking example is SUBARU - one small and then another large.

The small one spins up much faster, because it does not have much inertial energy - logically it is included in the work at the bottom, that is, first. For low speeds and up to low revs this is quite enough. But at high speeds and speeds, this “baby” is practically useless; here you need a supply of a much larger volume of compressed air - a second, heavier and more powerful turbine is turned on. Which gives the required power and performance. What does this sequential arrangement give in BI-TURBO? This is almost the exception of turbo lag (comfortable acceleration) and high performance at high speeds, when traction remains even at speeds over 200 km/h.

It should be noted that they can be installed both on a V6 unit (with its own turbine on each side) and on an in-line version (here the exhaust manifold can be divided, for example, one blows from two cylinders, and another from the other two).

The disadvantages include the high cost and work required to set up such a system. After all, fine adjustments of the bypass valves are used here. Therefore, the installation is required on expensive sports cars, such as TOYOTA SUPRA, or on luxury cars - MASERATTI, ASTON MARTIN, etc.

The main task here is not to get rid of the “turbo lag”, but to maximize productivity (compressed air injection). As a rule, such a system operates at high speeds, when one supercharger cannot cope with the increased load on it, so another one of the same type is installed (in parallel). Together they pump twice as much air, giving you almost the same performance boost!

But what about the “turbo lag” that is rampant here? But no, she is also effectively defeated only in a slightly different way. As I already said, small turbines spin up much faster, so imagine - they replace 1 large one with 2 small ones - the performance practically does not drop (they work in parallel), but the “YAMA” goes away because the reaction is faster. Therefore, it turns out to create normal traction from the very bottom.

Installation can be the same as for in-line models power units, and V-shaped.

It is much cheaper to manufacture and set up, so this structure is used by many manufacturers.

This can also be called “BI-TURBO” or “TWIN-TURBO” - whatever you want. In fact, both the compressor and the turbo option do the same job, only one (mechanical) is much more efficient at the bottom, the other (from exhaust gases) at the top! Read about the differences in boost here.

As a rule, the compressor is installed on a belt drive from the engine crankshaft, so it spins up as quickly as possible with it. Thus, allowing you to avoid the “PIT”, but at high speeds it is useless - this is where the turbo option comes into play.

This symbiosis is used in some German cars, a big plus of the compressor is that it has a much higher resource than its opponent!

Now let's watch a short video

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You've probably heard more than once that there are turbocharged engines, and gasoline internal combustion engines also have turbines. But engines also have two turbines. However, such cars are not widely used, being quite expensive. But you can get information for free.

So, there are turbocharged engines called Bi-turbo and Twin-turbo. Many people believe that the difference in names depends on the car manufacturing companies. However, companies aside, the reason for the differences lies in the turbo itself.

Twin-Turbo supercharging system. Imagine how a turbine functions. It is designed to create air pressure, which is then pumped into the cylinders. As the engine speed increases, the turbine loses efficiency, and with it the power necessarily decreases. In order to prevent this, to increase its speed at high speeds, the car engine was simply equipped with a second turbine.

But turbines can function together in different ways, depending on how the system is configured. For example, parallel operation is possible, as well as sequential operation - first one turbine pumps up pressure, and then it is replaced by a second one. Sometimes an additional turbine is connected when there is a lack of power, compensating for losses. Let us add that the Twin-Turbo system is successfully installed on in-line and V-shaped units.

Bi-Turbo – such units also have a pair of turbines, but if in the “Twin” version they are the same, here a more powerful one is added to the ordinary turbine, which is also larger. The method of turning on the turbines here is always consistent: at medium speeds an ordinary turbine still works, and when they increase and it ceases to be enough, the enlarged turbine starts up. This configuration always ensures smooth overclocking characteristics. Installation of two turbines of this kind is also possible on both of the above-mentioned types of internal combustion engines.

But a car with different supercharging systems still behaves differently during a trip. In Twin-Turbo, there is a subtle turbo lag effect, when pressing the accelerator and firing the turbine is separated by a few fractions of a second. During this moment, the turbine spins up and gives the required increase. Bi-Turbo engines do not have a “pit” due to different turbines, which is why there are no shocks during acceleration.

Note that biturbo cars participate in races and car competitions, but Twin-Turbo does not allow this, because the design, you know, is not suitable for racing.