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 characteristics, 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 air enters the cylinders separately, through the flap, an optimal air-fuel ratio is formed, 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 there are many positive aspects, there are also a significant number of disadvantages. 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 on bad gasoline, it simply refuses to work normally and will malfunction.

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 comply with VW 504 00/507 00 tolerances. In other words, change engine oil 2 times a year - during the periods of transition to summer and winter 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.

2.0 FSI (Fuel Stratified Injection) engines are not unique in their kind, however, they are more common on the market. Mitsubishi was the first to introduce such an engine in 1997 - 1.8 GDI.

In theory, the 2.0 FSI engine is economical and environmentally friendly. It is characterized as much more efficient than conventional injection engines. There are a lot of advantages.

It must be admitted that if everything works as it should, then a car with 2.0 FSI and TFSI will appeal to many. You can count on an advantageous ratio of performance to fuel consumption. For example, the Audi A3 2.0 FSI consumes on average about 7.5-8 l / 100 km, and the 200-horsepower version - only 2 liters more.

Perhaps that is why Volkswagen decided to develop turbocharged engine modifications, and FSI removed it from sale. As a result, TFSI has found its way under the hood of many VW models and is now the main engine for powerful compacts, small sports cars, and mid-range and higher-class cars. If the 2.0 FSI was presented in only one forcing option - 150 hp, then the TFSI received several variations - from 170 to 272 hp.

Unfortunately, the 2-litre direct injection unit has a number of costly problems. In naturally aspirated versions, after 90-140 thousand km, carbon deposits appear on the intake valves - soot. There are problems with camshafts and engine sensors. In addition, minor interruptions in the operation of the motor are enough for the “Check Engine” message to appear.

In the case of a turbo engine, one should be wary of problems with the turbocharger and high oil consumption (sometimes it takes up to 1 liter per 2000 km). In addition, there have been cases of soot on the intake valve and sensor failure (for example, a knock sensor).

Soot on the valves

Symptoms: uneven and rough operation, reduced power.

Repair: The problem mainly affects early versions of FSI. Later the software was changed. Carbon deposits are removed in several ways: with special cleaning agents or mechanically.

Oil consumption

Symptoms: rapid drop in oil level, catalytic converter damage.

Repair: the problem is well known to official dealers. Excessive oil consumption mainly concerns the 200-horsepower version of the engine of the initial production period and the later 211-horsepower unit. The only solution is to overhaul the engine.

Technique

The 2 liter direct injection engine is a modern design. In addition to a special injection system, this engine has pistons and a 16-valve head made of aluminum alloy, an intake manifold with air flow control flaps, and a variable valve timing system.

A timing belt is responsible for the timing drive, but in some versions of TFSI it is a chain (since 2008 - CAWA, CAWB, CCTA, CCZA and CCZC). The injection system uses a high pressure pump and an exhaust gas recirculation valve. The TFSI engine is constantly evolving, and currently the flagship version of the engine has a power of 272 hp.

Technical Data 2.0 FSI / TFSI

Part 1

Options	2.0 FSI	2.0TFSI	2.0TFSI*	2.0TFSI	2.0TFSI	2.0TFSI**
Release years	2004-09	2005-10	since 2008.	since 2004.	since 2008.	2005-07
Engine type, number of valves	petrol, R4/16	turbo, R4/16	turbo, R4/16	turbo, R4/16	turbo, R4/16	turbo, R4/16
Working volume	1984	1984	1984	1984	1984	1984
Compression ratio	11.5: 1	10.3: 1	9.6: 1	10.5: 1	9.6: 1	10.5: 1
Timing type	DOHC	DOHC	DOHC	DOHC	DOHC	DOHC
Max. power (kW / hp / rpm)	110/150/6000	125/170/4300	132/180/4000	147/200/5100	155/211/4300	162/220/5900
Max. torque (Nm / rpm)	200/3500	280/1800	320/1500	280/1800	350/1500	300/2200

Note: * Engine can be powered by bioethanol; ** The variant was installed in the Audi A4 series 8E (DTM version).

Part 2

Options	2.0TFSI***	2.0TFSI****	2.0TFSI*****	2.0TFSI	2.0TFSI******
Release years	2007-08	2011-12	2007-13	since 2008.	since 2008.
Engine type, number of valves	turbo, R4/16	turbo, R4/16	turbo, R4/16	turbo, R4/16	turbo, R4/16
Working volume	1984	1984	1984	1984	1984
Compression ratio	10.3: 1	9.8 1	9.8 1	9.8 1	9.8 1
Timing type	DOHC	DOHC	DOHC	DOHC	DOHC
Max. power (kW / hp / rpm)	169/230/5500	173/235/5500	177/240/5700	195/265/6000	200/272/6000
Max. torque (Nm / rpm)	300/2200	300/2200	300/2200	350/2500	350/2500

Note: *** Only on Golf V GTI Edition limited to 30 units; **** Limited edition of 35 Golf VI GTI Edition only; ***** In Leon Cuprze; ****** In the Golf R - the manufacturer indicates a power of 271 hp.

Spare parts cost ($) *

	Dealerships	Analogues
oil filter / air	9/25	from 7/20
spark plug
turbocharger	1100	from 800
thermostat
water pump
coils (pcs.)
dual mass flywheel

* For 2.0 TFSI / 200 HP (2006).

Application

The engines are most widely used in the following cars:

Audi A3 (2003-2012), Skoda Octavia II (2004-2013), Audi A5 (since 2008), Volkswagen Golf (2003-2008), Seat Leon (2005-2012), Volkswagen Passat (2006-2010).

If you are wondering about buying a car or replacing it, and at the same time want a TFSI engine installed on it, then gather as much information about this engine as possible in advance.

After all, what is a TFSI engine and there are quite a lot of options for cars with such an engine, and the choice is a rather difficult procedure and many different factors must be taken into account. For example, financial.

If your finances allow you to buy a good and high-quality car, then you already know that this purchase will serve you faithfully for many years. But we must not forget that the engine of any vehicle is its most important component.

It is this node that is responsible for the power, speed of movement and the ability to transport a certain mass. Many modern motors have various prefixes and names and markings in their names.

Therefore, you, as a car enthusiast, must carefully study and decipher these data before purchasing such a tool. They can tell you a lot. Knowing this information, you will know what your car is ready for, what restrictions it has and how it will behave on the road.

Description and features of the engine

TFSI engine stands for Turbocharged Fuel Stratified Injection. But there is another abbreviation that is very similar to the one that will be discussed now, TFS. For some reason, many drivers mistakenly confuse them and are greatly mistaken in this. These 2 engines are completely different. They differ in features and design.

There is a motor with which TFSI really has common features, this is FSI, however, they also have very strong differences. For comparison, we will take these two engines to talk a little about them. FSI today is a rather old version of motors, but quite reliable. For many years of its existence, such engines have managed to show themselves in work and have proven themselves well.

Once again, the German company was at the height of the production of high-quality and durable engines. It was the invention and production of FSI that became the impetus for the appearance of injection engines in general.

Over time, the quality of the developers' engines ceased to suit and they set themselves the goal of creating something new, more powerful and efficient. At the same time, they wanted to invent an engine that would emit less harmful substances into the atmosphere, that is, it would be more environmentally friendly.

By the way, at present, the Europeans have a leading role in ecology in all areas, including engineering. This area includes the conditions under which the quality of a product is recognized. So cars are no exception.

That is why in the production of engines for the implementation of their ideas, they did not affect only the one that concerned the injection of the mixture directly into the cylinders themselves. Everything else has changed. Some of the nodes have been revised and improved. Piston designs have generally been changed so that the engine does not lose its power, but at the same time reduces its compression performance.

2 camshafts were added to the design of the cylinder head, which were made of durable and resistant types of metals. Valves were made from the same material. The system responsible for the intake and exhaust of fuel was also improved. It was improved as follows: the channels that were responsible for the supply of fuel and the removal of gas workings were corrected.

The supply of gasoline has also been changed in TFSI. This system has undergone changes in the form of installing a modernized pump, which pumped up fuel and gave a pressure an order of magnitude higher than in FSI. As a result, we got more power, but lower consumption. In the previous version of the motors, the pump had only 2 cams, in the modern version one more was added and we already have a three-cam design.

The pump is electric, due to which its firmware has been changed. This made it possible for the engine to calculate the amount of fuel supplied, taking into account the needs of the motor. Gradually, we came to the main difference between these types of engines is the presence of a turbocharger.

In the abbreviation TFSI, this change occurred in the addition of the letter T. Thus, there was a change in the name from FSI to TFSI. Adding this letter to the name and the presence of a turbocharger gave this type of engine more power, dynamics and torque.

Now we would like to finally dispel all doubts about the difference between these two engines. After all, both in one and in the other there are turbines. And at first glance, they are the same and equal to each other. But no, there are still significant differences. Only TSI has two.

First, one of them is the supply of fuel, which goes to the intake manifold. The second difference is that the design of such a motor provides for the presence of a turbine tarbonaduva. That is, the design of the engine provides for both a mechanical turbine and an electric compressor.

Exhaust gases lead to the operation of one unit. Another unit increases the air pressure. Their work is organized in turn and depends entirely on the operating modes of the motor. TSIs are considered more economical and more responsive than TFSIs.

TFSI is most often installed by Germans on car brands such as Audi and Skoda. Now it’s worth paying a little attention to problematic issues and the main disadvantages of TFSI motors. Each unit and node has them, and it will not be right if we hide them and do not touch them.

TFSI engine problems

So, we will take the 2.0 TFSI engine and discuss what the owners of cars with these types of engines installed on them most often complain about. The first and fairly common problem is oil consumption or, as many car owners put it, “oil zhor”.

This problem is not present in fresh cars, but more concerning those that have already run more than average. Yes, there is a problem, but it is solvable and there is nothing wrong with that, just contact the service in time and they will help you fix everything. Usually everything is solved by replacing components such as the VKG valve. If this procedure does not solve the problem, then the valve stem seals are changed.

The second problem is knocking. It appears when the camshaft chain tensioner has already worn out. It is also solvable and occurs by replacing this node.

The third problem is the loss of power, that is, there are failures in acceleration. The problem lies in the valve number 249. Replacing it will solve all the problems.

The fourth problem at high speeds the car does not go. Check the injection pump pusher, the problem is in it. If this unit is periodically checked (every 15-20 thousand kilometers) and controlled, then its replacement will solve everything.

Fifth problem refueled the car, but it does not start. Check ventilation valve. These kinds of problems are more about American cars. The most interesting thing is that we named the problems that people often encounter.

However, you probably noticed that all of them are quickly resolved. They bought the part, replaced it, that's the whole algorithm. Since engines are quite complex, the best option would be to contact specialists in this field if problems arise.

Some Volkswagen Group vehicles are equipped with a specific type of engine: the TFSI engine. Of the most prominent representatives of such cars, Audi cars can be distinguished, it is on them that these engines are installed with great success. Many people continue to confuse this engine with the Volkswagen TSI engine, although these engines are significantly different from each other.

TFSI are turbocharged engines, they are installed on AUDI cars and on some Skoda cars. TSI and TFSI - engines are completely different both in structure and in some characteristics. But, for example, TFSI can be compared with another engine - FSI, which is conventional and non-turbo.

TFSI and FSI.

FSI has been produced by Volkswagen for a long time. It has stood the test of time and has performed well. It was this engine that became, in a sense, the progenitor of the TFSI engine, when the concern set itself a rather serious task: to increase the percentage of efficiency of FSI engines. In addition to this task, a number of others were set: to increase engine power, reduce the amount of harmful substances emitted into the atmosphere, etc. Based on the tasks set, a new type was developed.

TFSI engines have an almost identical design with their older comrade, they have the same fuel injection as the FSI - directly into the cylinders.

The changes include the design of the engine pistons, namely the bottom of the engine piston, which was redesigned so that the engine could work with a decrease in the compression ratio. The cylinder head, crankshaft and connecting rod of the engine were also changed.

Distinctive features of TFSI.

The letter T denotes the presence of a turbocharger in the engine, or in other words, a turbine. This same turbine is located in the exhaust manifold. With him, she forms a common module. A module flange is attached to the cylinder head using special terminals. The engine turbine provides certain advantages in terms of torque, dynamics and acceleration power (when comparing TFSI and FSI).

For TFSI engines, the fuel supply system was slightly changed, namely, a new type of fuel pump was developed. Due to this application, the developer managed to increase the level of engine power and at the same time reduce the amount of fuel consumed. The latest firmware on the pump makes it deliver exactly as much fuel as the engine uses.

Thus, we can conclude that the TFSI engine is an improved turbocharged version of the FSI engine.

Marketers of the VW-Group concern have made a lot of confusion, using different abbreviations to refer to engines installed in Volkswagen, Skoda, Seat and Audi. Today, under our guns, the TFSI engine. Consider some design features, problems and differences from TSI motors.

TSI and TFSI

It's no secret that Skoda, Seat and Audi are all owned by Volkswagen, which implies joint engine development. So it turns out that the abbreviation TSI is used on Skoda, Seat Volkswagen models, and TFSI on Audi cars, but the letter designation serves to identify identical motors. The difference between Turbo Fuel Startified Injection and Turbo Startified Injection is only in the absence of the word Fuel (from English - fuel) in the designation. Immediately note that there is no universal one, called TFSI or TSI. This is only a general designation for a series of engines with direct injection and additional air supercharging. We have already considered earlier, so we will not dwell on this. In this case, the engine can only have a mechanical supercharger or a supercharger paired with a turbocharger. Depending on the year of production, the abbreviation can be worn by both engines with conventional, if appropriate, direct injection, and internal combustion engines using the Miller-Atkinson cycle.

It would be wrong to talk about these motors in the singular, cutting them all with the same brush. The same applies to the list of the most common problems and malfunctions that occur during the operation of TFSI engines. By the way, even now there are enough materials on the network written by people who are incompetent in this matter or compiled before the time when it became necessary to separate engine models.

Generation Models

TFSI is a logical development of a direct fuel injection system called Fuel Startified Injection. The main feature of FSI, which allows the atmospheric engine to be both economical and powerful at the same time, is layered mixing. Thanks to the features of the intake manifold, fuel injection and "tamed" turbulence, the engine can run on both ultra-lean and homogeneous mixtures.

V-shaped internal combustion engines

The TFSI line includes not only in-line models, but also V-shaped “hearts”:

• 3.0 V6 with a power of 213 kW;
• 4.0 V8. TFSI engine with power from 309 to 382 kW. To increase efficiency and reduce emissions of harmful substances as unnecessary, part of the cylinders can be turned off, an energy recovery system is used.

Problems and malfunctions

Among all the malfunctions of TFSI engines, one can distinguish:

• stretching the chain, leading to extraneous knocks during operation and the risk of "meeting" the valves with the pistons. Troubles can overtake the owner already at 30-40 thousand km. run;
• maslozhor. This problem, unfortunately, affects all gasoline ICEs from the VW-Group. Constant improvements to the CPG only delay the mileage at which increased oil consumption appears. Often the owners themselves exacerbate the problem, unknowingly operating the car in uncomfortable conditions for the motor. Constant careful operation leads to aggravation only with “stroking” the gas pedal and long warm-ups at idle.

Telling the story of the development of Turbo Fuel Startified Injection, we used individual engine letters. It is by these numbers and letters that you can accurately identify the model and generation of the engine installed in a particular Audi. When buying a used car with TFSI, you should look for profile information using these particular designations. To increase the circle of information search, correlate abbreviations with the designations used for Volkswagen cars.

We simply do not have the opportunity to describe all the problems of specific ICE models. If you want to buy a used or new Audi, we recommend that you refer to the reviews of real users. You can find all the subtleties of the design, the principle of operation of each of the TFSI engine series in the Audi Self-Study Program. The materials are intended to improve the skills of Audi service center employees and, fortunately, are freely available.