The introduction of the 2.0T FSI engine to the market in 2005 had a lot of euro enthusiasts excited with anticipation. Probably because the predecessor, 1.8T engine made a lot of impact on the aftermarket euro tuning scene a few years after its debut. The 1.8T became one of the most tunable engines in Euros. Performance manufacturers started making an immense amount of aftermarket parts for the engine, with lots of parts to choose from, prices for them dropped and created the opportunity for enthusiasts to tune their engines to output an extreme amount of power. Back to the 2.0T FSI engine, which can be found in a large variety of Audi and Volkswagen vehicles worldwide, such as Audi A3, A4, VW GTI, Jetta GLI, Eos, and Passat.
For the North American market the engine was first introduced in 2005 Jetta and 2006 Passat and was 2.0L/200HP 4-Cylinder Turbo FSI ( Fuel Stratified Injection) with 4-Valves per Cylinder at 207 lb-ft of torque. The special features of the engine include, exhaust system with 2 catalytic converters, Hitachi ethanol-resistant high-pressure fuel pump, returnless fuel system, homogeneous fuel injection, decoupled final drive sprocket in the balance shaft drive gear, and elliptical secondary drive wheel on the crankshaft. The Fuel Stratified Injection is a direct-injection system developed by Volkswagen and use in many VW and Audi cars. The main purpose is to increase the engines output and reduce fuels consumption, and VW claims their FSI does it by as much as 15%.
Since this engine packs the potential, and its predecessor has a lot of earned respect in the performance industry, lots of companies started manufacturing aftermarket parts for 2.0T FSI. With a large variety of parts available for the engine now, tuners can extract up to 30% more power from the engine with just basic upgrades. Just like in any vehicle that is lenient for performance upgrades some of the basics are, software upgrade, cold air intake, intercooler, and exhaust. Lets starts with the software upgrade, which is probably one of the simplest and most performed upgrades that will bring the most whp gain. There are a lot of brands on the market that offer quality products, but on average, a software upgrade will generate anywhere from 20-50 horsepower gain, and 50-85 torque gain. Intake is the most fundamental way to increase engine output, it increases the amount of cold air going in the engine or more precisely into the combustion chamber.
There is an unending amount of CAI (Cold Air Intake) systems readily available on the market today probably for every vehicle on the market. By installing a CAI you can expect an average of 8-10 horsepower increase. The next step is an intercooler, the main purpose of an intercooler in a turbocharged engine is to decrease air intake temperature by providing constant cooling, this will result in more consistent power delivery and extra power. Most aftermarket intercoolers are 100% bolt on and require not trimming. You can expect an average increase of 15 whp on a modified car. The last fundamental performance mod is an exhaust system. OEM exhaust systems are very restrictive, because they have obligations to meet certain sound and emission standards of the industry. Aftermarket exhaust systems are designed with performance in mind as a priority. By eliminating the unnecessary bends in the piping design of the exhaust and increasing pipe diameter, they reduce backpressure and maximize power output. You can expect anywhere from 10-12 whp increase from certain aftermarket exhaust systems. This was a list of basics upgrades for a 2.0t FSI engine, or any other OEM turbocharged engine. With these upgrades you can extract up to 30% more power output from your automobile. All of these modifications are available as bolt on, and should not require trimming.