Redline Speed Worx is Proud to Announce the release of APR's Stage 3+ Supercharger Upgrade for the Audi B7 RS4!
The Stage 3+ Supercharger Upgrade Is Available For Purchase Here.
Since the release of the B7 RS4, Audi’s technological advances on RS models have grown dramatically. However, this often came along with the removal of traditional manual 6-speed transmissions many RS owners have grown to love. APR quickly realized the RS4 represented one of Audi’s last great performance sedans and chose to continue advancing the platform more than half a decade after the last RS4 rolled off the production line.
APR’s technical reach has grown enormously since opening in the 1990’s and currently represents a force of unmatched performance without compromise in the performance enhancement sector for Audi vehicles. Our previously available APR Stage III TVS1320 Supercharger System found its way on to several hundred RS4s around the world, making it the most popular and reliable system on the market. With more than four years' worth of RS4 supercharger engineering research, development and testing, APR’s new Stage III+ TVS1740 Supercharger System represents the pinnacle of Audi’s German engineering enhanced by APR’s American ingenuity.
In the factory form, Audi’s older high revving FSI V8 leaves much to be desired compared to some of the latest technological advances brought forth by Quattro GmbH in recent years. The APR Stage III+ TVS1740 Supercharger System fills the void by adding an average of roughly 40% more horsepower and torque across the entire power band. The results are nothing short of amazing; taking the RS4 from 414 horsepower to 626 horsepower on pump fuel and 688 on race fuel without breaking a sweat! With more than 500 FT-LBS on tap thanks to the TVS1740’s positive displacement supercharger expect instant acceleration with absolutely no lag commonly associated with other forms of forced induction.
Supercharger & Manifold
At the heart of the APR Stage III+ Supercharger System is Eaton’s latest Twin Vortices Series (TVS) supercharger unit, the TVS1740. The supercharger system is a positive displacement, roots style pump, utilizing Eaton’s lightweight, four-lobe 160 degree twisted rotors. Cast and assembled as a single, OEM-style-manifold and rotating group housing, the unit is quiet, compact, attractive, easy to install, and requires little to no extra maintenance to the unit itself.
Engine Management
With the significant amount of changes included in the APR Stage III+ TVS1740 Supercharger System, APR’s Engineers spent months calibrating the engine management system, including well over 100+ hours of in-house chassis dyno development. Drivability, gear changes, cruising and part throttle operation were tuned to operate smoothly as if intended by the OEM. Further development was performed putting the vehicle through performance evaluation and durability testing at the drag strip. APR’s Electrical Engineers built new coding functions, strategies and routines into the ECU to control conditions normally unseen at factory power levels. Thanks to APR’s incredible proprietary calibration suite, data logging software and full access to the coding structure of the ECU, appropriate and intelligent changes are made to ensure flawless drivability and excellent performance without compromise.
Front Mount Heat Exchanger
APR’s supercharger system features a large, 310mm x 540mm x 42mm, front mount heat exchanger responsible for cooling coolant as it’s pumped out of the supercharger’s dual internal air-to-water heat exchangers. This is a critical component in any supercharged application to not only keep power consistent, pull after pull, but also to help keep IAT below dangerously high levels. The heat exchanger is specific to the RS4 platform, featuring a hand welded design and CNC, laser-cut brackets to provide a simple and clean method of mounting to the vehicle.
Coolant Pump & Harness
APR’s coolant pump connects to the supercharger coolant circuit and continuously circulates coolant through the supercharger’s dual internal air-to-water radiators and APR front mount heat exchanger. The pump provides adequate coolant flow through a system of this size. The pump seamlessly connects to the factory wiring harness through the included APR wiring harness with no wire splicing and is triggered by the included relay system. APR’s CNC, laser-cut bracket provides a simple and clean method of mounting the pump to the vehicle.
High Pressure Fuel Pumps
Sold separately as brand new pumps or rebuilds of the engine’s existing pumps, the APR High Pressure Fuel Pumps address fueling needs and leaves plenty of headroom for safety and further increased power levels. By increasing the pump’s internal capacity, the fueling system is capable of displacing a higher volume of fuel per minute at every RPM. Read more on the APR High Pressure Fuel Pumps product page. They are additional available for
Coolant Expansion Tank
The APR coolant expansion tank is used for filling the supercharger’s cooling circuit and for handling liquid expansion under various operating temperatures. The tank is cut from a single block of aircraft grade 6061 aluminum billet, is anodized black and proudly displays the APR logo. APR’s CNC, laser-cut bracket provides a simple and clean method of mounting the expansion tank to the engine bay.
Fueling Hardware
APR’s supercharger system varies greatly from the OEM intake manifold design, and for fitment’s sake, the factory high pressure fueling system must be modified. The fuel rails and other high pressure and low pressure direct injection fuel lines are replaced with new, low profile, OEM parts. All OEM safety equipment remains intact.
All Required Gaskets & Hardware
The APR Supercharger System features dual internal air-to-water radiators designed to reduce intake air temperature, (IAT), before entering the cylinders. With cooler IAT, the ECU will request more ignition advance and result in more power.
New OEM gaskets and bolts are provided to facilitate a leak proof connection between the cylinder heads and APR Supercharger unit.
The included core support bolts allow the vehicle’s front end to be placed into the service position. In doing so, the install process is made much easier thanks to the added space in the engine bay.
The included factory style zip-ties aid in securing various lines moved during the install and to replace factory zip-ties removed during the install process.
Padding material protects items from damage during the install process.
Dyno Testing
Horsepower and Torque was measured in APR’s in-house, sounmaster dyno cell, using a dynapack all wheel drive dynamometer. Multiple stock and modified runs were conducted and the SAEJ1349 corrected results were averaged together to represent the differences between a stock and APR Stage III+ B7 RS4. Crank power figures were estimated based on Audi’s factory advertised results.
APR Stage 3+ TVS1740 Supercharger System Calibration Report
Video
Acceleration Testing
All too often performance upgrades show improvements during a single dyno pull, but lack the ability to show the same performance in real world conditions. Furthermore the dyno may be unable to illustrate the system’s response and other tuning changes designed to make the system instantly react to the drivers input. Through acceleration testing, APR’s engineers were able to improve power delivery during launches, after gear changes and prove the cooling system was up to the task of sheading heat to keep power consistent.
APR’s local certified quarter mile drag strip is a perfect and safe testing ground for high speed, 130+ MPH sprints. Using Car and Driver magazine’s measured results as a benchmark, APR’s Engineers setout to prove the Stage III+ Supercharger System was capable of increasing the RS4’s performance substantially.
Car and Driver magazine measured the B7 RS4’s sprint from 30-130 MPH in an underwhelming 17.2 seconds. However, with the addition of the APR’s Stage III+ TVS1740 Supercharger System, the vehicle entered a league of performance often shared by exotic supercars. Using 93 octane fuel the same acceleration test was completed 6.64 seconds faster! Through testing higher octane fuels, and eventually weight reduction and tire changes, the gap grew even larger, ultimately resulting in an astonishing 48.2% reduction in time.
Many more acceleration tests were preformed, including record setting quarter mile passes, proving an APR Stage III+ TVS1740 Supercharger System is the ultimate upgrade for B7 RS4!
Requirements & Recommendations (Sold Separately)
The Complete APR Product Page On The Upgrade Can Be Viewed Here!
If you are interested in this upgrade for your Audi B7 RS4 please Contact Us TODAY ! We offer Complete Financing Options for this upgrade as well as any other service, repair, or upgrade on your european vehicle !
The Stage 3+ Supercharger Upgrade Is Available For Purchase Here.