FSI vs TSI – Which One Is More Superior and Reliable?

FSI vs TSI – Which One Is More Superior and Reliable?

FSI stands for “Fuel Stratified Injection,” and TSI is for “Turbo Stratified Injection.” These abbreviations relate to engines that employ the direct fuel injection technology pioneered by Volkswagen and Audi. These engines use highly pressurized fuel in a common rail system that is pumped directly into each of the four cylinders’ combustion chambers.

FSI engines use a fuel-rich “stratified charge” near the spark plug. More NOx is produced as a result [1].

As a result, the air-to-fuel ratio used by FSI engines in the U.S. is the same as that used by port-injected engines. The air-to-fuel ratio used by FSI engines in the United States is the same as that used by port-injected engines, whereas FSI engines use lean burn in Europe for the best power and efficiency.



In 2008, the FSI engine was phased out in favor of the TSI engine, which had debuted in 2004 [2].

Between FSI and TSI engines, there are some notable distinctions. Through a pump, the gasoline for FSI engines is fed into the machine. To compel air into the engine, TSI engines have a turbocharger. It was published on August 1st, 2010.​

What is the same in both FSI and TSI?

  • Displacement: 1984cc
  • Max Power:  200hp
  • Max Torque:  206 lb-ft
  • Valves per Cylinder:  4
  • Bore: 82.5mm
  • Stroke: 92.8mm
  • Firing Order:  1-3-4-2

What was different between the FSI and TSI?

  • The FSI uses chain timing as opposed to belt timing
  • 6:1 compression ratio, down from 10.5:1;
  • Bosch MED 17 engine management, up from Bosch MED 9
  • Oxygen Sensors: Adding one more to bring the total to three from two
  • The main bearing caps are now cross-bolted to the block for added strength.
  • Oil spray jets on the pistons’ undersides for better cooling lubricant shafts.
  • More evenly distributed camshafts in the block’s middle
  • Improved PCV system,
  • Updated internals with less internal parasitic loss,
  • An improved flowing cylinder head

The most recent version of VW/small Audi’s displacement turbo architecture, known as the EA888 TSI platform, will eventually provide incredible power [3].

TSI engines have lower fuel consumption and pollutant output compared to FSI engines. This is done so that the turbocharger can be employed, which improves the engine’s performance at higher compression ratios. A simpler design and lower failure rate are features of the turbocharger.

FSI engine problems


The following are examples of FSI engine problems:

  1. VW and Audi 2.0T FSI Bad Ignition Coils and Misfires

There may be some problems with the 2.0T FSI engines from VW and Audi. For example, a flashing check engine light is more likely to occur when the ignition coil malfunctions [4].

In addition, misfires on one or more cylinders may result from defective ignition coils. By switching the ignition coils to other cylinders, they can be examined.

  1. Cam Follower and Camshaft Wear problems

To generate the high pressures required for direct injection, FSI employs a mechanical high-pressure fuel pump (upwards of 1800 PSI). The cam follower shields the FSI fuel pump from the camshaft lobe. Thus, the Cam Follower frequently fails.

  1. 0T FSI Diverter Valve (DV) Failure (P2099)

A key component of the turbo system is the diverter valve, often known as the turbo recirculation valve. Its duty is to relieve the battery when you let off the gas or in between shifts [5].

The diaphragm’s tearing is the primary cause of this component’s failure. The piston-style DV is better and more dependable because it has no wearable component.

  1. FSI Carbon Build-Up and Cold Start Misfires Problem on FSI

Eventually, the intake valves on your VW or Audi FSI engine will accumulate carbon. When it does, it usually begins randomly generating misfire codes when the car is cold (or has been sitting for some time). These are frequently known as “cold start misfires” and are likely to worsen over time. Carbon buildup in the intake manifold may cause both of these symptoms.

Preventative Measures

  • Catch Can
  • Sea Foam or other chemical manifold services
  • Water Methanol Injection (Performance oriented)

Cleaning Solutions (Once you have carbon built up)

  • Picks and scraping for manual cleaning (Intake Manifold off)
  • Media Blasting (Soda, Walnut, and Others  (Intake Manifold off)

Intake Manifold Runner Control (IMRC) Motor for 2.0T FSI

According to the engine’s request, the IMRC motor control flaps in the intake manifold control the airflow direction. IMRC motor failure causes the motor to bind up or become stuck occasionally. Check the engine light with the following error codes that may result from this. The intake flap motor on your VW or Audi FSI would need to be replaced to fix this.

Check the Gas Cap light on VW and Audi 2.0T FSI

Hydrocarbons in fuel vapors can be harmful to the environment [6]. The N80 valve regulates the volume of fuel vapor that returns to the engine. This valve may become stuck open, clogged, or lose its electronic functionality. A “check gas cap light” or a fault code P0441 will most often appear on your dashboard (EVAP Emission Control Sys: Incorrect Flow).

2.0T FSI Chain Adjuster, Timing Chain, and Chain Tensioner Problems.

The two camshafts of the FSI engine are kept in sync by a timing chain on the driver’s side as opposed to a timing belt on the passenger side. Oil pressure is applied to the cams by the Cam Chain Adjuster to operate. Given that this component is oil-driven changing the time may be impossible if it becomes blocked.

An ECU solenoid valve that controls oil flow to the cam adjuster enables the tensioner. The timing chain that maintains the cams on schedule will likely jump if it breaks. A neglected engine could have issues like P000A/000010 – Camshaft A: Positioner Slow Response.

2.0T FSI PCV Valve and Loud Whistle Noise

The FSI engine’s PCV valve is crucial. You could encounter several problems if this component breaks. For example, if there is a significant vacuum leak, the car may make a loud whistling noise from underneath or run rough. As a result, there may even be a check valve failure that results in a loss of power. A new PCV valve is a fantastic solution if you’re trying to find a vacuum or boost a leak.

2.0t FSI VW and Audi Fuel Pump Control Module

The FSI fuel pump control module is typically found under the back seat of VW and Audi vehicles. The Electric Pump Module is installed between the electrical harness of the car and the in-tank electric fuel pump. Unfortunately, these pump components frequently go wrong and can be extremely problematic.

FSI Coolant Temp Sensor

The coolant temperature sensor is an essential component of your car that maintains your engine functioning properly. It performs many tasks and, if it fails, can lead to several problems. For example, most VW and Audi vehicles typically run too chilly rather than overheating if they malfunction of thermostat.

FSI vs TSI reliability


Both engines are typically dependable in terms of reliability. But since the TSI engine is newer and hasn’t been around as long as the FSI engine, it might be more reliable.

According to official technical statistics, the Volkswagen Passat B6’s 2.0 FSI/TSI/TFSI (EA113) engine normally consumes more than 8 liters of fuel per hour [7].

The output is often 1.5 liters higher in practice. This shows that even when considering 150 horsepower, the assumption of increased savings has not been realized.

Read Also: VW EPC Light Car Shaking

A modern gasoline engine (EA113) with direct fuel injection will be the Volkswagen Group’s main weapon against rivals. Unfortunately, the new engines’ appearance was not as striking as the Germans had hoped.

The 2.0 FSI/TSI/TFSI (EA113) engines were no longer manufactured in 2009 after five years since they were not as well-liked or reasonably priced as they could have been.

Related: Glow Plug Light Flashing VW 


In conclusion, high-octane fuel, like super unleaded or Shell Optimax, is required for the FSI technology to function at its best. Smaller engines may run more effectively with TSI technology, enabling them to travel farther on a given amount of fuel.

All TSI engines, which are strong and lightweight in design, offer high specific torque at low revs, boosting the dynamism, effectiveness, and clean operation of Volkswagen vehicles.