Description
Vehicle Fitment:
2.5 TFSI
Gen 1
Pre-facelift Hatchback
Rest Of World Only (Non-US models)
Description:
APR is pleased to present a high pressure fuel pump upgrade for the 2.5 TFSI.
APR is an OEM supplier of high pressure fueling components to VAG and has operated with a nearly perfect tract record since the program’s motorsport backed inception in 2006. With thousands of pumps sold yearly, APR has a wealth of knowledge and manufacturing techniques utilized in the production of critical fueling components with exceptional reliability.
In the early 2000s, VAG began supplying engines with a new direct injection technology known as FSI. Unlike conventional engines of the past, fuel is sprayed directly into the cylinders under extreme pressure resulting in increased power with lower consumption rates and fewer emissions. The technology has spread across VAGs entire lineup of modern gasoline engines and is present in the 2.5 TFSI.
The engines fueling system operates to a maximum of 2,100 psi (145 bar) of pressure to correctly spray and atomize fuel directly into the engines cylinders. This is contrast to multi port injection vehicles of the past which typically operated around 40-60 PSI and were driven off of a low pressure fuel pump. To generate these enormous pressures, the 2.5 TFSIs variable low pressure fuel pump supplies fuel to a cam driven and solenoid fired high pressure fuel pump which in turn supplies the injectors with fuel.
A three-lobe cam located on the exhaust camshaft drives the 2.5 TFSIs Hitachi Generation III high pressure fuel pump. As engine speed increases, so does the pumps ability to displace a greater volume of fuel per minute. The maximum volume the pump can deliver per revolution on the three-lobe cam is dictated by the stroke length from the cam lobes lift and bore diameter of the pumps internal pressurizing cylinder. Its important to understand, despite the name, APRs High Pressure Fuel Pump upgrade is not necessarily designed to increase the engines fuel rail pressure. The primary goal is to increase the volume of available fuel.
The engines fueling system is very capable without modification, even at high power levels generated using APRs Stage II+ ECU Upgrade and exhaust. However, APRs Stage III Turbocharger System is capable of generating significantly more power and requires modification to high pressure fuel pump to keep up with fueling demands.
The APR High Pressure Fuel Pump addresses fueling needs and leaves plenty of headroom for safety and further increased power levels in the future. By increasing the pumps internal capacity, the fueling system is capable of displacing a higher volume of fuel per minute at every RPM.
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