K04-N

Engine Compatibility

The K04 turbocharger is commonly used as an upgrade for the 2.0 TSI EA888 engines found in vehicles like the Volkswagen Golf, GTI, and Audi A3. These engines typically come with a K03 turbocharger, and the K04 offers significant performance improvements.

Hardware Requirements

• Turbocharger: The K04 turbocharger itself, often sourced from OEM S3 or Golf R models.
• Oil Feed and Return Lines: New oil feed line washers (N0138514) and oil return line gaskets (06F145757L) are necessary.
• Coolant Lines: Coolant feed line washers (N0138149) and coolant return line washers (both thin and thick, N0138149 and N0138144) are required.
• Downpipe and Turbo Manifold Nuts: Downpipe nuts (N10286108) and turbo manifold nuts (N90894601) need to be replaced.
• PCV Block Off: An Integrated Engineering PCV block off may be necessary.
• DV Relocate: A custom or Unitronics DV relocate kit might be required.
• Exhaust Manifold Studs: Although not always necessary, having new exhaust manifold studs (N0444115) on hand is recommended in case the old ones break.

Software and Tuning

• Tuning: The upgrade requires specific software tuning. If you are already using APR tuning, the upgrade price is typically $499.99 + tax and labor. It is crucial to install a 3bar map/boost sensor with the new flash.
• Compatibility: You can drive an IHI turbo on K04 software or vice versa, but it is advised to take it easy and avoid boost until the correct tuning is applied.

Installation Process

• Time Estimate: The installation process can take around 2 full days (approximately 17 hours), including trips to the hardware store and dealing with potential issues.
• Challenges: Key challenges include learning the various parts of the car, removing stubborn bolts, and dealing with the heat shield and washer setup on the banjo bolts.
• Steps:
  • Drain oil and swap filters.
  • Remove the old turbocharger and associated components.
  • Install the new K04 turbocharger, ensuring all connections are secure.
  • Replace necessary nuts, bolts, and washers.
  • Relocate the DV if necessary.
  • Reassemble the vehicle, ensuring all connections are snug and secure.

Additional Recommendations

• New Parts: When buying used components, it is imperative to purchase all new nuts, bolts, washers, and fluids to avoid potential issues.
• Correct Elbow: Ensure you get the correct elbow for the turbo outlet pipe.
• Coolant Mixture: Use 1 liter of distilled water for the coolant mixture.

Performance Expectations

The K04 turbocharger can significantly increase the power output of the 2.0 TSI EA888 engine. For example, it can take a stock 200 hp engine to over 300 hp with the right tuning and supporting modifications.

By following these guidelines, you can ensure a successful and well-planned K04 turbocharger upgrade project.