APR MS100024 FSI B8 S4 Supercharger Pulley Kit

APR has developed the world's first Supercharger Pulley and corresponding ECU Upgrade for the Audi 3.0 TFSI engine. Without recalibrating the ECU found in Audi’s latest line of supercharged direct injected vehicles, pulley upgrades offer no advantage, as the stock Audi ECU will simply bypass extra boost pressure. With APR’s ability to expertly recalibrate the 3.0 TFSI Engine Control Unit, they can develop new hardware and calibrate the ECU to work properly as if intended by the factory.

Many enthusiasts coming from Audi’s history of turbocharged vehicles expect massive increases in torque, at lower RPMs, simply by adding an ECU Upgrade. The 3.0 TFSI uses an Eaton Twin Vortices Series (TVS) Roots-type Supercharger unit, which features a four-lobe rotor design to safely run at high operating speeds. Unlike turbochargers, roots style superchargers are positive displacement meaning they provide a fixed amount of air flow based on engine speed. On the 3.0TFSI, Audi chose to use an electronically controlled bypass valve that bleeds off boost pressure when requested by the ECU. Keeping the bypass valve almost completely shut at lower RPMS allowed Audi's engineers to make respectable torque and opening the valve at higher RPMs kept horsepower within marketing goals.

The APR Stage I ECU upgrade prevents boost from bleeding back into the intake system, resulting in higher boost levels which provides a relatively low increase in torque but an exceptional increase in horsepower. However, boost pressure is still limited by the size and the speed of the TVS1320 supercharger. For those demanding more torque, the APR Supercharger Pulley Upgrade is the answer. The APR Supercharger Pulley Upgrade increases the RPM of the supercharger resulting in an increase of boost pressure all the way to redline and effectively doubles the low-end gains of Stage I. The gain in torque is felt immediately, but the results are present from beginning to end.

A balance of power and reliability is always a concern when going beyond what Audi delivers from the factory. APR's Engineering Teams use accelerated life testing both in house and through professional motorsport racing to ensure years of Performance Without Compromise. APR is no stranger to the Eaton TVS1320 Supercharger Unit having spent several years developing a Stage III Supercharger System utilizing the Eaton TVS1320 Supercharger for the high revving Audi RS4 and S5 4.2L FSI V8. Through the years, APR's engineering teams have placed even greater speed demands on the TVS1320 than offered to the public with a flawless track record.

APR has chosen not to cut any corners and as such each APR Supercharger Pulley Upgrade Kit includes a new supercharger belt. Furthermore, all existing APR Stage I ECU Upgrade customers are entitled to a free APR Stage II+ ECU Upgrade required for proper functionality. Finally, every APR Pulley is E-Coated black for an OEM appearance.