Power, Drivability, Reliability: these three words sum up APR's Audi 2.7T K04 Stage III kit. APR's unique approach to product development brings together a product with the level of refinement that this car deserves.
APR has a history of developing high-quality turbocharger upgrade kits. The APR T3100001 2.7T Stage III upgrade system continues this tradition. This product uses OEM Audi RS4 components, APR-designed components, and of course, APR-engineered engine management software calibrations.
This ultimate turbo system upgrade is now available for the 2.7T cars. This kit is capable of 447 horsepower and 467 foot-pounds of torque at the flywheel on 93 octane gas, while retaining stock-like drivability. The highlights of the kit include the following:
- RS4 K-O4 Turbochargers
- RS4 K-04 Inlet Pipes and "Y" hoses
- RS4 MAF and Airbox
- RS4 Accordion Hose and Y-Pipe
- RS4 Fuel pump
- RS4 High Flow Fuel Injectors
- All Associated Plumbing and Hardware
APR has the largest development staff in the Audi aftermarket and they put them to work in choosing the proper components in developing this system. The turbochargers for this kit are larger-than-stock K-04 units. These turbochargers have proven to be much more reliable than the stock 2.7T K-03 turbochargers (this kit is an excellent choice for anyone needing to replace their stock turbochargers, by the way). The extra flow and pressure capacity of these turbochargers allow boost pressures of approximately 20psi to be run at full throttle all the way up to high engine speeds.
The K-04 turbochargers bolt up perfectly to the stock Audi manifolds. APR chose to retain the stock manifold design for several reasons. The stock manifold has a small internal volume for quick turbo spool-up and a cleverly designed dual-wall construction. The dual-wall construction keeps heat in the exhaust gases where it is needed. This increases the amount of energy available to the turbocharger turbine to spool the turbo (reduced lag/lower boost onset) and also reduces the heat transmitted to other components (an important consideration given the tight constraints). A conventional cast manifold would transmit too much heat to the surrounding components after shut down. A fabricated manifold would adversely affect lag and would transmit too much heat during operation. The factory decided to use the S4 exhaust manifolds in the RS4 and APR chose to do the same for this kit.
For fueling, APR opted for the larger fuel injectors and the increased flow capacity fuel pump used in the Audi RS4. With larger turbochargers and the engine running higher boost pressures, these components were necessary to meet the fueling needs of the engine and retain an adequate safety margin. The stock and upgraded fuel components were thoroughly compared on APR's fuel component test equipment to determine flow capacities. Although the stock components clearly were not up to the task, the components APR chose to use fit the requirements perfectly.
In order to accurately measure the quantity of air entering the engine, it is vital that the air metering system be well designed and precisely manufactured. It is also very important that the mass air flow sensor be precisely mounted in a quality sensor housing and that the system be well thought out. A custom design was not necessary for the APR 2.7T Stage III kit as APR found a quality factory alternative for increased airflow capacity in the RS4 unit.
Note:
An exhaust system with downpipes is required but not included with the kit and will need to be purchased separately. Not recommended for Tiptronic equipped vehicles due to the high torque output.
Important install information:
Check and double check that all plastic shipping plugs have been removed from the turbocharger during installation. Also check your old oil lines for any obstruction in the lines that could disrupt vital oil flow to the turbochargers. Before starting the car put some oil in the oil inlet of the turbo once the oil drain is installed while lightly spinning the turbo by hand. Once installation is complete crank the car with the ECU out for 5 15-20 second bursts.
Free shipping on this item applies inside the continental US (when advertised).
