Both have EA888 engines. Volkswagen calls them TSI and Audi calls them TFSI. What is the difference between the two? I believe this is a problem that troubles many friends. In fact, whether it is Volkswagen or Audi, EA888 can only be regarded as a series of engines, not the final

is both an EA888 engine. Volkswagen is called TSI, and Audi are called TFSI. What is the difference between the two? I believe this is a problem that troubles many friends. In fact, whether it is Volkswagen or Audi, EA888 can only be regarded as a series of engines, not the final product. Take the Audi Q5L currently on sale. If you look at the engine series alone, this car is powered by the EA888, but the power performance is different depending on the model.

Among them, the Audi Q5L 40T version is equipped with an EA888-DTA engine with a maximum power of 140 kilowatts and a peak torque of 320 N·m; while the Audi Q5L 45T model is equipped with an EA888-DKW engine with a maximum power of 185 kilowatts and a peak torque of 370 N·m. So, apart from different parameters, what are the differences between these two sets of power?

EA888 engine history

Car owners who know Volkswagen must know Volkswagen EA888 engine . For many domestic users, everyone is familiar with the concept of turbocharged , which also started with this engine. From the Volkswagen Passat , Magotan , Tuyue, Tiguan , to Audi A6L, Audi Q5L and other luxury brand models, they also use the EA888 series 2.0T engine. But it should be noted that the EA888 engine that everyone calls is not developed by Volkswagen, but is led by Audi. So far, the EA888 put into mass production by Volkswagen has evolved to the 3rd and 3.5th generations (GEN3/3Bz) .

Volkswagen EA888 engine

In 2004, the first-generation EA888 engine was born, but it was not until 2006 that this engine officially entered the market. Relying on turbocharging and in-cylinder direct injection technology , the first-generation EA888 engine brought consumers There is strong power, but the problem that comes with it is also obvious-burning engine oil.

Audi EA888 engine

In 2009, the second-generation EA888 engine was launched. Compared with the first-generation engine, this engine has AVS variable valve lift technology, and a secondary oil-gas separator was added to alleviate the problem of oil burning after listening to feedback from car owners. The problem of oil burning, but judging from consumer feedback, the problem of oil burning in the EA888 engine has not been alleviated much.

EA888 engine evolution history

With the emission regulations and fuel consumption points, EA888 has been continuously upgraded. Starting from the third-generation EA888 engine, this series has also successively made adjustments in details such as the injection system, turbine, compression ratio, and cooling system. After 2016, the EA888 GEN3B, commonly known as the "three and a half generations", officially debuted. Although is the same as the first generation product, it also belongs to EA888, but in terms of technical details, this engine has undergone many upgrades. What are the classifications of

EA888 engines?

As mentioned earlier, in the Volkswagen/Audi family, the EA888 series is mainly used in high-end models of Volkswagen, Skoda , and some Audi models. The models currently on sale for are mainly DTA, DKW, DPL, DLH, DKY, DKX, DMF, and DMJ. The versions on sale in the domestic market are roughly divided into: GEN3 Bz, GEN3 ordinary, and GEN3 high-power . The specific classification is as follows:

Data reference: Tianma Xingkong Q

Based on the above analysis, it is not difficult to see that the EA888-DTA engine belongs to the GEN3 Bz series, which is a third-generation product, while the EA888-DKW engine belongs to the third-generation high-power product. On a technical level, both engines are equipped with the Audi Variable Valve Lift System, referred to as the AVS system. But GEN3 BZ uses mixed injection technology, while GEN3 uses in-cylinder direct injection technology. Next, let’s take a look at the differences between the two engines.

Performance curves of different EA888s

EA888-DTA engine

Equipped models: Audi A4L 40T, Audi Q5L 40T

The entry-level Audi Q5L 40T model is equipped with the GEN3 BZ engine, the engine model is DTA, and the BZ behind it is German Budack Zyklus, Budack is the name of the new engine designer, and Zyklus translates to cycle in German. So in the Volkswagen/Audi family, this set of power is also the B cycle.

Audi's B cycle is optimized on the Miller cycle . As we all know, the concept of the Miller cycle is expansion ratio > compression ratio. For a normal engine, to achieve an expansion ratio greater than the compression ratio, must let The closing time of the engine intake valve is advanced, which makes the mixture of air and fuel inside the piston better, and improves the compression ratio of the engine . The concept of the B cycle is to use the intake valve to close in advance during partial load and control the overlap angle of the intake and exhaust valves at the same time.

Optimized Miller cycle

Looking at the information of this engine, we can see that the intake valve of the ordinary combustion method is closed 20° before bottom dead center, while in the B cycle, it is closed 70° before bottom dead center. If you don’t understand this concept, you just need to understand that this approach can greatly improve fuel economy. It can be seen that at the power level, the GEN3 BZ engine pursues fuel economy rather than power.

So, how does the EA888-DTA engine achieve this effect? The answer is simple, that is Audi's AVS variable valve lift system .

Audi AVS variable valve lift system mainly relies on camshaft and camshaft electromagnetic driver (AVS solenoid valve). Structurally, this system has two sets of cams, namely high and low angle cam . Unlike traditional engines, the cam on this engine is not fixed and can move left and right, and the cam has spiral grooves.

Different versions of AVS have different functions.

When the engine is running at high load, the system controls the AVS electromagnetic driver to move the camshaft to the right, switch to the high-angle camshaft, and increase the air intake volume by increasing the lift of valve ; while in During low-load operation, the system can control the electromagnetic driver to move the camshaft to the left and switch to a low-angle cam, thereby shortening the intake valve stroke and reducing the intake volume. As a result, this system can ensure the power while taking into account the engine's fuel economy.

Secondly, this set of power also uses mixed injection technology (PFI and GDI).

In Volkswagen Group , mixed injection technology (PFI valve injection and in-cylinder direct injection GDI) has been used since 2011, and its first model is the EA888 engine. PFI injection is to replace the fuel injector It is installed on the intake manifold , and then the fuel is injected near the intake valve, and then the air is sucked into the piston from the intake valve. This injection pressure is lower , generally below 10Bar, and is also known as Jet the manifold.

The in-cylinder direct injection (GDI) injector is installed on the cylinder head . It is a side-mounted high-pressure injector. Judging from its working status, when the fuel is injected, its pressure reaches 250Bar. For engines, has obvious advantages of high pressure, which can improve the atomization effect of fuel and improve fuel economy. In addition to the previous details, GEN3 BZ also uses improved piston and cylinder block to change the shape of the piston top, which also helps to improve fuel economy .

EA888-DKW engine

equipped models: Audi A4L 45T, Audi A6L 40TFSI, Audi A6L 45TFSI, Audi Q5L 45T

Compared with GEN3 BZ, the biggest difference between GEN3 and GEN3 BZ is the AVS variable valve lift system and fuel injection method, which can also be viewed It is the difference between EA888-DKW engine and EA888-DTA engine.

Schematic diagram of different injection systems

As mentioned above, the AVS of GEN3 BZ is on the intake side, while GEN3 is on the exhaust side, and uses the in-cylinder direct injection fuel injection method. At the same time, in the injection process, the EA888-DKW engine does not use the mixed injection technology like the EA888-DTA. The main reason is that GEN3 pays more attention to power, so it abandons the mixed injection technology and uses in-cylinder direct injection. During the injection process, the injection pressure of this power set is 200Bar.

Structurally, the EA888-DKW engine has the AVS valve lift system installed on the exhaust side, mainly to improve low-speed performance and turbine response speed. At the same time, compared with EA888-DTA, EA888-DKW also has a larger turbine. Coupled with the exhaust design, the engine's power response can be greatly improved, so depending on the model it is equipped with, EA888-DKW is more powerful than EA888-DTA.

Comparing the first and second generation products, does the third generation EA888 still burn oil?

It is undeniable that among the Volkswagen/Audi family, the performance of EA888 is very powerful, but from another perspective, the situation of Volkswagen EA888 burning oil still exists. However, judging from actual usage, the phenomenon of oil burning in third-generation products has been alleviated compared to the first two generations. The fundamental reason why the second generation of

1. burns engine oil is to reserve more space for thermal expansion at high temperatures for the aluminum piston. When the engine is working, the gap between the piston and the cylinder is too large, causing engine oil and gasoline to cross each other. In addition, the German engine cooling system has a higher temperature and higher volatility, so it is more likely to cause oil burning.

EA888 Piston rings after GEN3

Starting from the third generation EA888, the third generation EA888 redesigned the piston ring. The third layer of oil control ring is composed of two thin steel plates, a gasket and an expansion spring. During the operation of the engine, the 3-layer oil control ring can effectively scrape off the oil and prevent the oil from escaping into the combustion chamber , thereby slowing down the phenomenon of oil burning. At the same time, the oil and gas separator has also been changed to a two-stage separation. The oil will no longer enter the combustion chamber with the volatilization of gasoline. Therefore, although the EA888 still burns oil, compared with the previous engine, this situation is much optimized.

Compared with Mercedes-Benz GLC and BMW X3, how is the power performance of Audi Q5L?

At present, in the mainstream mid-size luxury SUV market, BMW X3, Mercedes-Benz GLC, and the Audi Q5L we mentioned earlier, all use 2.0T power. However, at the configuration level, like the Audi Q5L, they also provide high and low configurations for consumers to choose based on different configurations.

The BMW X3 is equipped with the B48B20D engine. After the new facelift, the technically upgraded version is Technical Update, so it is also collectively referred to as the B48TU engine . At the same time, in order to achieve better combustion, this system has also upgraded the ignition system to a 42kV system, which not only improves fuel economy, but also takes into account driving performance. The Mercedes-Benz GLC is equipped with the 264 920 engine. At the technical level, this engine has NANOSLIDE aluminum cylinder spraying technology to replace the iron cylinder liner, mid-mounted injector piezoelectric injector, variable valve lift technology Camtronic, Dual flow channel supercharger and other technologies.

Based on the comparison table, it is not difficult to see that the performance of the three cars is basically the same whether the is an entry-level model or a high-end model. But specifically in terms of maximum power, the Mercedes-Benz GLC has the highest power. On the other hand, the Audi Q5L pays more attention to fuel economy. Whether it is the 40T model or the 45T version, the fuel consumption is the lowest among the three..

Conclusion:

As an engine that has been in the market for many years, the performance of the EA888 series is relatively comprehensive in terms of reliability, fuel economy, and driving performance. At the same time, based on the background of National VI, this engine also has a lot of upgrades in terms of emissions. Although there is still a certain gap between this car and the Mercedes-Benz GLC in the same price range in terms of performance, combined with the price of this car and the consideration of fuel economy, it can still meet the car needs of the vast majority of users. .