Volkswagen AG EA113 1.8T Engine Specs

The Volkswagen Group EA113 1.8T is a 1.8-liter turbocharged inline-four petrol engine produced from 1994 to 2008, one of the most significant and widely celebrated performance engines in VW Group history, used across the Audi A3 and TT, Volkswagen Golf Mk4 and Jetta Mk4, Passat B5, Seat Leon, and Skoda Octavia. The 1.8T was central to VW Group's performance and image-building strategy through the late 1990s and 2000s, appearing in everything from mainstream family hatchbacks to genuinely quick performance models.

Producing between 150 and 225hp and 210-280Nm of torque from 1,781cc depending on state of tune, the 1.8T uses a DOHC 20-valve head (five valves per csilinder in early versions), a single turbocharger, and multi-point fuel injection, delivering strong, broad torque that made even mainstream 1.8T-equipped Golfs and Passats feel genuinely quick for their era, while the higher-output versions in the Audi TT and Seat Leon Cupra pushed performance considerably further.

The 1.8T built an excellent reputation for both reliability and tuning potential during its production run, and it remains one of the most popular engines for aftermarket tuning of any VW Group unit, thanks to genuinely strong factory internals capable of handling meaningful power increases with just an ECU remap and supporting modifications. A handful of maintenance items are worth understanding on used examples. The timing belt is a critical, interference-engine component and must be replaced strictly on schedule along with the water pump and tensioner. The turbocharger requires attentive maintenance, with quality oil and consistent change intervals mattering considerably to its long-term health - this is particularly important on modified examples running more boost than stock. Ignition coil packs are a documented wear item on many 1.8T applications, sometimes causing misfires as they age. Given the 1.8T's huge popularity and production volume, parts availability and specialist tuning knowledge remain excellent even many years after production ended.