Consider this... Motorsport teams around the world such as SEAT Sport, Volkswagen Motorsport in Germany, and APR Motorsport all run APR HPFPs. They fully understand the importance placed on such a crucial engine component and absolutely trust the only product on the market that's fully engineered and tested prior to shipping.
While modifying the 2.0T FSI engine beyond factory power levels, it becomes apparent that an additional volume of high-pressure fuel is needed to make horsepower, especially in the midrange (3000-5000rpm) of the powerband. Because of this dependency on engine rpm for the high pressure fuel pump output volume, the FSI pump is capable of flowing almost 370hp at 7000 rpm, but yet only 158hp at 3000rpm. The graph below illustrates the maximum horsepower potential of the stock fuel pump compared to the APR FSI fuel pump. Also on the graph are stock and APR Stage III horsepower numbers. Clearly, the stock pump is insufficient for the output generated by this upgraded kit. The only way to address this issue while maintaining a pump that fits in the stock location is to change the volume of the pumps internal pressurization chamber.
In order to address the lack of fuel in the midrange, the APR FSI fuel pump increases the volume of fuel from the high pressure pump by over 40%. Simplified, this is achieved by modifying some key internal parts within the pump. Changing these components requires precision machining of the new components with special surface treatments, as well as enlarged, redesigned seals. Using inferior components on this critical part can lead to many problems from gasoline in the engine oil (from a bad seal) to complete engine failure (from a seized piston in the high pressure pump).
The components used in the APR pump are also of a high caliber. The piston and barrel of the new pump are made of a certified and heat-treated bearing-grade stainless steel and have a special diamond like coating. The seals used in the pump are made of a high performance, filled polymer with a high modulus spring to retain the seal forces throughout the life of the product. The cross section of the seal is also of a proprietary design to maintain integrity over many years of use.
APR FSI pumps have been track tested for over a year now, with several hundreds of thousands of miles of combined usage. Each APR pump starts out as a brand new OEM pump, is modified with the new components by APR, and then undergoes a rigorous testing process on their high pressure fuel pump tester. Once a pump passes APR standards, it is serialized and shipped to the customer.
The APR fuel pump tester is a key element in the APR fuel pump production process. With the fuel pump tester, APR is able to perform several tests to ensure every pump is working to the high standards we have set for it. First, the fuel pump tester allows them to perform the critical initial break-in of the new pump. Also, by bringing the pump up to the full operating pressure, they can confirm that the seals in the pump are properly installed and not leaking. Finally, a performance test is performed to make sure that the pump output is within specifications. This level of quality control ensures a lifetime of worry free miles with an APR FSI high pressure pump. These pumps are assembled in a clean-room environment so that no dust or debris gets inside the assembly. Contaminants inside the pump can damage the pump and cause other failures. Some companies sell a kit you can do yourself, but the tolerances and cleanliness are just not going to be the same.
To ensure flawless drivability, you may wish to consider APR engine management recalibration to allow for the increased size of the APR fuel pump. If you already have APR software installed this recalibration upgrade is included in the fuel pump price, otherwise it needs to be purchased separately. Currently, some APR Stage II and K04 turbocharger clients will be able to take advantage of increased horsepower and torque up to 25hp and 35lb ft with APR fuel pump specific engine management performance recalibrations.
We can also send your original equipement HPFP to APR and have it upgraded to the same specs. Search part number MS100017.