Every abbreviation in the automotive industry means something. So, the concepts of FSI and TFSI also matter. Only here is the difference between almost identical abbreviations. Let's analyze what is inherent in the names and what is the difference in them.
Characteristic
The FSI power unit is a German-made engine from the Volkswagen concern. This engine has gained popular popularity due to its high technical specifications as well as ease of construction, repair and maintenance.
The abbreviation FSI stands for Fuel Stratified Injection, which means layered fuel injection. Unlike the widely used TSI, the FSI is not turbocharged. Speaking in human terms, this is an ordinary naturally aspirated engine, which Skoda used quite often.
FSI engine
The abbreviation TFSI stands for Turbo Fuel Stratified Injection, which means turbocharged stratified fuel injection. Unlike the widespread FSI, the TFSI is turbocharged. Speaking in human terms, this is a conventional naturally aspirated engine with a turbine, which Audi used quite often on the A4, A6, Q5 models.
TFSi engine
Like FSI, TFSI has an increased environmental standard and economy. Due to the Fuel Stratified Injection system and thanks to the features of the intake manifold, fuel injection and “tamed” turbulence, the engine can run on both ultra-lean and homogeneous mixtures.
Pros and cons of using
The positive side of the Fuel Stratified Injection engine is the presence of dual-circuit fuel injection. From one circuit, fuel is supplied at low pressure, and from the second - at high pressure. Consider the principle of operation of each fuel supply circuit.
The low pressure circuit in the list of components has:
- fuel tank;
- gasoline pump;
- fuel filter;
- bypass valve;
- fuel pressure control;
The device of the high pressure circuit assumes the presence of:
- high pressure fuel pump;
- high pressure lines;
- distribution pipelines;
- high pressure sensor;
- safety valve;
- injection nozzles;
A distinctive feature is the presence of an absorber and a purge valve.
FSi engine Audi A8
Unlike conventional gasoline power units, where the fuel enters the intake manifold before entering the combustion chamber, on the FSI, the fuel enters directly into the cylinders. The nozzles themselves have 6 holes, which provides an improved injection system and increased efficiency.
Since the air enters the cylinders separately, through the damper, an optimal ratio is formed air-fuel mixture, which allows gasoline to burn evenly without subjecting the pistons to excessive wear.
Another positive quality of using such aspirated is fuel economy and a high environmental standard. The Fuel Stratified Injection system will allow the driver to save up to 2.5 liters of fuel per 100 kilometers.
Applicability table TFSi, FSi and TSi
But where are many positive aspects, there are also a significant number of shortcomings. The first disadvantage can be considered that the aspirated is very sensitive to the quality of the fuel. You can't save on this engine, because bad gasoline, it simply refuses to work normally and will fail.
Another big drawback can be considered the fact that in the cold, the power unit can simply not start. Considering common faults and FSI engines, cold start problems can occur in this range. The culprit is considered to be the same layered injection and the desire of engineers to reduce exhaust toxicity during warm-up.
Oil consumption is one of the disadvantages. According to most owners of this power unit, an increase in lubricant consumption is often noticeable. To prevent this from happening, it is recommended to keep the VW 504 00/507 00 tolerances. In other words, change the engine oil 2 times a year - during the periods of transition to summer and winter mode operation.
Conclusion
The difference in names, or rather the presence of the letter "T", means that the engine is turbocharged. Otherwise, there is no difference. FSI and TFSI engines have a significant number of positive and negative sides.
As you can see, the use of aspirated is good in terms of economy and environmental friendliness. The motor is too sensitive to low temperatures and poor fuel. It was for the shortcomings that its use was discontinued and switched to the TSI and MPI systems.
If you are well versed in engines, then you certainly know what TSI is. If not, we recommend reading this article.
TSI engine- This is a gasoline power unit, a distinctive feature of which is twin turbo. In this case, the abbreviation TSI (Turbo Stratified Injection) translates as an engine with a turbocharging system and layered fuel injection.
The design of the TSI engine is notable for the fact that the developers smashed the mechanical compression system and the turbocharger on different sides of the engine. By harnessing the energy from the exhaust gases, the standard turbocharged engine is supplied with extra power. Exhaust gases spin the turbine wheel, and with the help of a drive system create increased air injection and compression. This system is more efficient than traditional gasoline engine.
Benefits of TSI engine
A conventional turbocharged engine has one big drawback - at low and full speeds, its efficiency is low. In its turn, TSI engine equipped with a mechanical compressor (running at low speeds) and a turbocharger, providing a significant increase in power for high revs. That is, practically throughout the range revs going on additional injection and compression of air in the engine system.
It is thanks to this fact that the power increases many times against the background reduce fuel consumption.
Such a reduction is provided by a layered, metered injection system and a dual injection system. All these factors indicate that the TSI engine developed by Volkswagen has impressive power.
For comparison, take a classic turbocharged engine from the same manufacturer. With a nominal volume of 1.2 liters, the TSI engine shows results on average by 12 Horse power better (102 horsepower for a TSI engine versus 90 horsepower for a standard turbocharged engine). In addition, thanks to the dual compression system eliminates power failure and improves traction both at low and high speeds.
Naturally, the complexity of the layout of the TSI engine also affected its price. However, a small increase in price more than pays off with increased power and lower fuel consumption.
Not everyone knows what TSI is and how this abbreviation stands for. We will talk about this today.
What is TSI
The TSI engine is a petrol-powered unit characterized by a "twin turbo" system. The translation of the abbreviation TSI is as follows - an engine with a turbocharger and fuel injection in layers.
A distinctive feature of the TSI design is the placement of a turbocharger on one side and a system responsible for mechanical compression on the other. The use of energy from exhaust gases allows you to increase the power of a conventional turbo engine. This is possible due to the fact that the exhaust gases start the turbine wheel and forcefully pump and compress the air thanks to the drive system. Such a system shows greater efficiency than traditional ones.
What is improved in TSI engines
Recognized by experts and consumers, as evidenced by numerous awards. This system has been three years(in the period from 2006 to 2008) became the owner of the "Engine of the Year" award at the "Engine of the year" competition.
Using the concept of minimization, the essence of which is that a smaller engine with a small consumption of gasoline produces the most power. The reduction in the working volume made it possible to increase the efficiency, while reducing friction losses. The small volume facilitates the engine and the car as a whole. Such technological solutions have become an integral part of TSI.
Video showing how the TSI engine works:
Combining drive and economy. The initial goal of the developers was to create economical engines with high power and reduced CO 2 emissions.
Large rev range. TSI systems are tuned so that when the crankshaft rotates at a frequency ranging from one and a half thousand to 1750 revolutions per minute, then the torque remains at its highest, which has a good effect on how much gasoline is saved when the car is running, and on the power of the car. As a result, the driver receives maximum power at a large rev interval. TSI engines are perfectly combined with transmissions that have gear ratios, which are much larger, which has a positive effect on .
Optimization of mixture formation, which was achieved due to the specially developed design of the high pressure nozzle with 6 holes. The injection system is tuned in such a way that it provides greater efficiency in the combustion process of gasoline.
Intercooling provides more dynamics. One more hallmark The aggregate is the presence of an intercooler of fluids that has a system that circulates independently. This cooling reduces the volume of air that is injected, due to which the boost pressure rises faster. As a result, due to small delays in the turbo effect and the level of optimal filling of the combustion chamber, an increase in dynamics is achieved. TSI with a declared power of 90 kW without an auxiliary compressor does not have a turbo lag. Already when reaching the mark of 1500 rpm, you can get the highest torque data of 200 Nm.
Supercharging in TSI
Turbocharging and fuel injection. The TSI system uses a special technology that has made it possible to obtain the highest level of torque and the highest power for a car, despite the fact that the engine has a rather small volume: fuel injection together with turbocharging or combined supercharging with a turbocharger and compressor. In this design, the combustion of fuel is more efficient, due to which the power of the TSI exceeds that of traditional naturally aspirated engines.
A turbocharger combined with a compressor gives a good effect. The use of another compressor helped to smooth out the effect of turbo-lag, which occurs due to the fact that the turbocharger creates a sufficiently high boost pressure when the rev range is higher.
boost pressure readings. Roots mechanical compressor is started by means of crankshaft belt transmission. In this case, the level of force with which boost occurs begins at the smallest range with which the revolutions occur. This approach provides high traction characteristics and torque indicators in a large rev interval.
Dual supercharging, which is used in engines of this type, an efficient injection system, together with the highest pressure indicators with which fuel is injected, and the use of six-jet nozzles, make it possible to achieve gasoline savings for TSI engines, which is spent. Today cars created by Volkswagen, a series golf plus, model range Golf and Jetta, Touran and new models already have a turbocharged engine.
Revolutionary innovative technology
Today, Volkswagen is the only manufacturer that serially installs engines of this type, equipped with double supercharging in combination with staged injection, in cars of its own production. The placement of the compressor and turbocharger makes the pressure force with which boost occurs more. That is, an engine with a displacement of 1.4 liters is able to develop up to 125 kW (or 170 hp), which is a record in the automotive industry among four-cylinder engines.
Fuel savings due to reduced weight. The new TSI engine models, thanks to a number of improvements, weigh 14 kg less compared to engines of the same type equipped with a dual-charging system. Innovations include: design optimization of the head of the block and lighter weight of its cover, weight reduction by 304 grams of all camshafts.
Video about the operation of a turbocharged internal combustion engine:
It is quite logical that the complexity of the design and improvements in engines also affected. However, a slight rise in price is fully compensated by increased power indicators and a decrease in the amount of fuel consumed.
Surely everyone who thought about buying German Skoda cars or Volkswagen, thoughtfully considered the abbreviation of the TSI engine type, thinking about what the peculiarity of this power unit is. In the vastness of Russia, there are still many misconceptions about this. Some believe that this type of engine runs on diesel fuel, because with a smaller specific volume, it produces a much greater power value compared, for example, with a simple turbocharged engine. But in reality, everything is different. The TSI engine is far from being a diesel.
How does a TSI and FSI engine work?
FSI.
In order to better understand how the TSI engine works, let's take an example of how its "brother" FSI engine works. The abbreviation FSI (Fuel Stratified Injection) denotes engines developed by German specialists with the so-called "layered" fuel injection. in this engine is designed similarly to diesel units:
The fuel pump pumps gasoline at high pressure into a common fuel rail for all cylinders. Fuel injection controlled by a solenoid valve system is carried out using nozzles, by the way, if you want to flush the nozzles, then you here. The opening of each of the nozzles occurs after a command is given by the central control unit. The phase of operation in this case depends on both the speed and the load of the engine.
FSI engine video
Advantages of the FSI engine.
The advantage of such an engine is that due to the strict dosing of fuel injection into the combustion chamber, savings of up to 15% are achieved in comparison with gasoline engines equipped with a classic injection system. In addition, more uniform traction at low and medium speeds is provided by changing the camshaft phases.
TSI.
Unlike FSI engine, TSI engine is petrol power unit with dual turbocharging system. The abbreviation TSI (Turbo Stratified Injection) here can be translated as an engine with stratified fuel injection and turbocharging.
Such an engine inherited the fuel injection system from the FSI engine and received an additional mechanical compression system. Naturally, the design of such an engine is much more complicated. However, this disadvantage is fully compensated by its greater reliability, power and economy.
Video about the TSI engine
The layout of the TSI engine is different in that the turbocharger and the mechanical compression system are spaced apart on opposite sides of the engine. A traditional turbocharged engine obtains additional power by using the energy of the exhaust gases, which, by spinning the turbine wheel, through the drive system, create compression and air injection. Compared to a classic petrol engine, this system is more efficient, but the efficiency of the TSI engine with stratified injection and turbocharging is much more efficient.
Advantages of the TSI engine.
A big disadvantage of a simple turbocharged engine can be considered that it is poorly efficient at small and idling. Unlike him motor TSI has a mechanical compressor running on low revs and a turbocharger, which provides an increase in power at high speeds. Thus, additional compression and injection of air into the engine system occurs over almost the entire range of operating speeds. It is this factor that contributes to a multiple increase in power with reduced fuel consumption, which is provided by a metered, layered injection system and a dual injection system.
All of the above factors lead to the fact that the engine of the TSI system, developed by the German Volkswagen experts, reaches impressive power levels. So, in comparison with a classic turbocharged engine of the same manufacturer, with a nominal engine capacity of 1.2 liters, the TSI system engine shows an average result of 12 hp. better (90 hp for a turbocharged engine versus 102 hp for a TSI engine). In addition, the dual compression system results in no power drop and excellent traction at both low and high engine speeds.
Naturally, the complexity of the engine design could not but affect its price. But a slight rise in price fully pays off with a reduced level of consumption and increased power.