APR Audi B8 RS4 / RS5 4.2L FSI V8 ECU Upgrade
APR is pleased to present the ultimate ECU Upgrade for the Audi RS5 4.2L FSI V8.
After months of long nights and many hours of testing, developing and more testing, we’re pleased to offer you an ECU recalibration that is second to none. APR’s extensive research and development provides you with a powerful ECU upgrade with no loss of drivability or reliability. Expect faster acceleration, improved throttle response and more power across the entire power band.
APR’s 4.2L FSI V8 ECU Upgrade is an expertly recalibrated engine control strategy that primarily remaps the engine’s air fuel ratio and ignition timing, within the factory ECU, to provide smooth and reliable power as if intended by the OEM. APR’s ECU Upgrade is developed to work within the OEM and Tier 1 Supplier specifications for engine component stress tolerances and performance specifications. Available in octane-specific variations, APR’s calibrations allow you to take advantage of fuel quality available in your area. APR’s patented EMCS functionality puts the control of your engine’s operation at your fingertips and allows for additional features and options to be installed to your OEM ECU.
APR Stage I ECU Upgrade
The APR Stage I ECU Upgrade gives you higher peak numbers of 458 HP/330 FT-LBS on 93 (R+M)/2 octane and up to 466 HP/335 FT-LBS on 100 (R+M)/2 octane race fuel. As much as 18 HP and 16 FT-LBS of torque are available through the power band. APR’s ECU Upgrade is the best power per dollar modification for the new 4.2L FSI V8 and gives it just the extra edge these cars lack from the factory without pushing the limits. With factory-like smoothness and drivability, APR’s ECU upgrade will fill the void in an otherwise excellent car.
Beyond power and torque enhancements, APR’s Calibration Engineers were able to increase the acceleration rate of the Audi RS5 through other calibrations changes. Ignition delay is reduced resulting in a more responsive pedal without altering overall throttle sensitivity.
Increased Fuel Economy:
APR’s Calibration Engineers paid close attention to several parameters directly related to fuel economy, especially while cruising at highway speeds. Depending on your driving style and fuel quality, you may see better miles per gallon!
Speed Limiter Removed:
APR’s ECU upgrade increases the vehicle's top speed limiter for blistering sprints around the track or across the Autobahn without the speed limiter shutting down your fun!
Left Foot Braking:
APR's Left Foot Braking feature allows more control over the vehicle’s throttle. The factory equipped RS5’s throttle input is disabled while pressing the accelerator and brake at the same time. Left Foot Braking, a common motorsport driving technique, allows the driver complete control over the vehicle’s throttle and braking system, which may give the RS5 the edge it needs at the track. As is with all features APR adds to the ECU, this feature may be removed upon request.
- APR STG I 93 - Crank
- APR STG I 93 - Wheel
- Gain - STG I 93 vs Stock
- APR STG I 100 - Crank
- APR STG I 100 - Wheel
- Gain - STG I 100 vs Stock
As Measured by Audi
|Stock - 93 Octane (R+M)/2
As Measured by APR
|91 Octane (R+M)/2
95 Octane RON
|93 Octane (R+M)/2
98 Octane RON
|100 Octane (R+M)/2
104 Octane RON
|Rev Limit||8400 RPM||8400 RPM||8400 RPM||8400 RPM||8400 RPM|
|Speed Limit||Max Speed Limited||Max Speed Limited||Unlimited||Unlimited||Unlimited|
|Peak Horsepower (HP)||450 HP||450 HP||Unmeasured||458 HP||466 HP|
|Peak Torque (FT-LBS)||317 TQ||324 TQ||Unmeasured||330 TQ||335 TQ|
|Max Horsepower Increase over Stock||Unmeasured||10 HP @ 3250 RPM||18 HP @ 7150 RPM|
|Max FT-LBS of Torque Increase over Stock||Unmeasured||16 TQ @ 3250 RPM||16 TQ @ 2350 RPM|
|Program Mode||0-60 MPH||0-100 MPH||60-120 MPH||60-130 MPH||1/4 Mile 60 FT||1/4 Mile ET||1/4 Mile Trap|
|Data collected at the same location via a Racelogic P-Box and at an IHRA Certified Drag Strip with 93 (R+M)/2 fuel, launch control, ESP/ASR off, Dynamic mode and Sport mode. May not be comparable to data collected in other locations.|
|Best Measured Stock - 93 (R+M)/2 Octane||4.3 sec||9.8 sec||9.1 sec||11.7 sec||1.777 sec||12.430 sec||110.37 MPH|
|Best Measured APR Stage I - 93 (R+M)/2 Octane||4.0 sec||9.1 sec||9.0 sec||11.3 sec||1.749 sec||12.278 sec||111.98 MPH|
APR EMCS Programs and Features
APR’s patented EMCS, Enhanced Modular Chipping System, brings selectable programs and features to your factory ECU, all without the need to purchase external hardware. Other companies have attempted to imitate EMCS with clumsy external switching devices that only replace or multiply portions of a “base” calibration. However, EMCS has the ability to completely rewrite the entire operating map data, giving each map a complete set of calibration changes. APR’s EMCS features and programs modes are activated via your OEM cruise control buttons. Your cruise control will continue to function as normal.
Program switching allows the user to cycle though up to four different engine calibrations and operating modes all without the need for external hardware.
By selecting stock mode, the ECU calibration is reset to the factory calibration. The engine will run exactly as it did before purchasing APR software.
APR Performance Modes:
APR's octane-specific calibrations are available for various premium and race fuels around the world. Each performance mode is a completely new calibration, altered specifically for the characteristics of the fuel quality selected.
Fault Code Erase:
Fault code erase allows the user to erase and reset engine related trouble codes and ECU adaptation data without using a specialty tool.
Security lockout prevents unauthorized individuals from using APR's EMCS functionality. When enabled, APR's EMCS features will appear completely invisible until a user specified 2 to 4-digit security code is entered.
When activated, Anti-Theft prevents the engine from starting even if the factory key is used. The vehicle will be completely immobilized until a user specified 2 to 4-digit security code is entered.
APR's Valet Mode protects your vehicle from becoming an expensive toy for unauthorized individuals. By enabling Valet Mode, the vehicle's performance is extremely limited. Launch control is uneventful, the vehicles top speed is limited to roughly 40 MPH and the engine's redline is reduced to nearly 5,000 RPM!
APR Mobile is a simple yet powerful tool designed to enhance the APR tuning experience.
APR Mobile installs on smart phones, tablets and other devices and provides a wireless connection to the vehicle’s engine control unit or ECU. Once connected, the device can be used to access APR’s EMCS program switching features, read and clear fault codes and data log the ECU at high data rates not found on other commercially available tools. The app can also be used to access APR’s latest news articles, locate dealers in APR’s network and review previously saved data logging sessions.
To learn more about APR Mobile, please visit our product page.
How to use APR EMCS Programs and Features with APR Mobile
B8 RS5 EMCS Program Switching and Features are operated identically to the B8 S4 shown in the video above.
To Enable EMCS:
Turn the ignition and cruise control to the on position. Do not start the engine. Ensure Security Lockout or Anti-Theft is disabled.
To Unlock the ECU or Disable Anti-Theft:
"SPEED+" is used to enter a digit and "SPEED-" is used to register the digit. Enter the first digit of the security code by pressing "SPEED+" the number of times corresponding to the first digit, then use "SPEED-" to register the digit. Repeat this step for each digit in the user defined security code. The check engine light and EPC light will flash to indicate the ECU is unlocked or Anti-Theft is disabled.
To use Security Lockout to Lock the ECU:
Hold "RESUME" on the cruise control stalk. The check engine light will blink in sets of one to three blinks indicating different features. Release "RESUME" when the check engine light is flashing in groups of three blinks per second. The EPC and CEL will blink to indicate the ECU is locked.
To Cycle through APR Programs:
Hold "SET" on the cruise control stalk. The check engine light will blink in sets of one to four blinks to indicate programs one through four. Release "SET" during this sequence to select a program. The EPC light will flash one to four times to indicate the program selected. The vehicle may be started.
To use Fault Code Erase:
Hold "RESUME" on the cruise control stalk. The check engine light will begin to blink. Release "RESUME" when the check engine light is flashing in groups of one blink per second. Fault Codes will be cleared.
To Enable Anti-Theft:
Quickly press "SET, SET, RESUME, RESUME, SET, SET, RESUME and RESUME". The check engine light will begin blinking. The vehicle will no longer start until the user defined security code is entered.
The APR Development Difference
APR ECU Explorer:
APR’s proprietary ECU Explorer gives APR’s Calibration Engineers unparalleled access to the vehicle’s entire engine management system. Typical commercially available data logging tools, used by most tuners, only allow logging up to 12 engine-operating variables at extremely low data rates. These tools are also limited to a small, specific list of variables. APR’s ECU Explorer is capable of logging every variable found within the ECU. It’s capable of logging well over 100 variables at once with data rates as high as 100 samples per second. Synchronous data logging is available for fine-tuning.
APR ECU Composer with APR Live Tuning:
APR’s proprietary ECU Composer is used for altering the engine management system. With full access to every table, map and variable within the ECU, APR’s Calibration Engineers are not limited to a handful of maps as is common for most tuning companies. ECU Composer takes calibration to a new level on the RS5 with APR's Live Tuning. APR’s Calibration Engineers can test calibration changes with a single click of a button to instantly monitor the changes, rather than spending several minutes shutting down the vehicle to reflash the ECU. This allows a level of fine-tuning unmatched in the market.
APR ECU Assembly:
APR’s Electrical Engineers have the ability to alter the code structure of the ECU to add features not available from the factory. On the highly modified end, this allows APR to add forced induction to naturally aspirated vehicle as if intended by the OEM. However, for most RS5 owners, the advantage of this ability is the addition of APR’s patented EMCS Functions. EMCS puts the control of the engine’s operation at your fingertips and allows for additional features and options to be installed to your ECU.
|Year||Vehicle||Market||Engine||Transmission||Drivetrain||Included Options & Features||Price|
|A fully loaded ECU includes your choice of 4 APR Programs (Stock, Valet & Octane Specific Performance Modes) and all APR Options (Fault Code Erase, Security Lockout & Anti-Theft).|
|2012+||Audi B8 RS4||ROW||4.2L FSI V8||S-Tronic||Quattro||Fully Loaded ECU¹||Please Contact an APR Importer|
|2012+||Audi B8 RS5||North America||4.2L FSI V8||S-Tronic||Quattro||Fully Loaded ECU¹||$799.00|
|2010+||Audi B8 RS5||ROW||4.2L FSI V8||S-Tronic||Quattro||Fully Loaded ECU¹||Please Contact an APR Importer|
Two Ways to Purchase
Locate an APR Dealer:
Use the APR Dealer Locator Tool to find an APR Dealer near you. The APR Dealer will have the ability to upgrade your ECU while you wait!
Depending on ECU type, some APR Dealers may not possess the necessary equipment to support on site flashing. In this case, the APR Dealer can remove and send ECUs to APR’s headquarters. Typically ECUs are returned the same day they are received. Please inquire about on site availability before visiting a local APR Dealer.
Mail us your ECU (USA Only):
Remove your ECU and mail it directly to APR. We will upgrade your ECU and send it back typically the same day as we receive it. To remove your ECU, check for a removal guide in our Customer Support section, or give us a call. Then simply fill out an APR ECU Order Form and you’re ready to mail in your ECU.
Security, Warranty and Money Back Guarantee
All APR ECU Upgrades are fully encrypted to prevent theft of our valuable and proprietary coding information by lesser companies.
30 Day Money Back Guarantee:
All APR ECU Upgrades include a 30-day money back guarantee with no questions asked. If for any reason you are dissatisfied with the APR ECU Upgrade, return to your place of purchase for a full refund, provided you are within the 30 day period from the time of your initial purchase. Labor or shipping charges are not included in the guarantee and are at the discretion of the place of install.
Limited Lifetime Warranty:
All APR ECU Upgrades include a limited lifetime warranty against defects in the software, and to provide free updates and reflashes as they become available. Labor or shipping charges are not included in the warranty and are at the discretion of the place of install.