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APR
APR ECU Upgrade - 4.2L EA824 FSI V8 (RS4/RS5)
4.2L V8 Engine Tune for the Audi RS5 13-15
Part # ECU-42L-FSI-RS5
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APR ECU Upgrade - 4.2L EA824 FSI V8 (RS4/RS5)
4.2L V8 Engine Tune for the Audi RS5 13-15
APR's ECU Upgrades are the best dollar-per-horsepower modification one can make to improve engine performance. The upgrades dramatically increase horsepower and torque, making for an exceptionally quicker and more exciting vehicle. This is made possible through APR's optimization of the factory engine management system to take full advantage of the engine's capabilities, without needing any end user adjustment. The ECU Upgrades are available with various features and supported octane levels and each stage is compatible with most typical bolt-on modifications. The software is installed to the vehicle's factory ECU through the OBD-II port, resulting in a clean and headache-free install.
Features:
- Horsepower - More horsepower throughout the whole rpm band
- Torque - More torque throughout the whole rpm band
- Program Switching - Change programs and access features with your cruise control stalk
- APR Mobile - Change programs and access features with your smart device
- Valet Mode - Neuters the vehicle, giving the driver minimal output
- Anti-Theft - Password protects driving the vehicle
- Security Lockout - Password protects program switching
- Fault Code Erase - Resets ECU fault codes and adaption on the fly
- Fuel Grades - Multiple octanes from which to choose
- Acceleration - Accelerate faster with more power and reduced throttle lag
- Brake Boosting - Left foot braking or brake boosting added
- Speed Limiter - Go as fast as you want with the speed limiter out of the way
- Economy - While cruising, or driving normally, your fuel economy may benefit from our optimized calibration
- Flash Counter - Flash counter does not increase with each flash
- Direct Port Programming - Clean and easy install through the OBD II port without removing the ECU
- Free Updates - Get free updates for life
- Guarantee - 30 day money back guarantee
| Brand | APR |
|---|---|
| Engine Aspiration | Naturally Aspirated |
| Engine Configuration | V8 |
| Engine Displacement | 4.2L |
| Engine Family | EA824 V8 GDI |
| Engine Orientation | Longitudinal |
| Fuel Type | Gasoline |
| Market | NAR |
| ROW | |
| Product Type | ECU Upgrade |
| Part Number | ECU-42L-FSI-RS5 |
Important fuel quality information
Important fuel quality information
Important fuel quality information
Find your boxcode and revision
Find your boxcode and revision
Find your boxcode and revision
Program switching guide
Program switching guide
Program switching guide
Only use fuel equal to or higher than specified. Never use a lower octane fuel. Always follow our fuel guide, especially with race fuel and Ethanol, where available. Dynos are for reference only. Results will vary. Contributing factors include the vehicle condition, vehicle setup, dyno type, dyno setup, environmental factors, fuel quality, and more. When describing fuels, the North American Region (NAR) uses the Anti-Knock Index (AKI), (RON+MON)/2, or (R+M)/2. The Rest of the World (ROW) uses RON. RON is Research Octane Number and MON is Motor Octane Number.
Please Note: Each vehicle's year, make, and model may have multiple factory engine or transmission controller software part numbers, known as box codes, each with unique revisions. Manufacturers periodically release software updates that alter this information, which can only be determined by scanning the controller and is not publicly provided. Due to the variety of codes, some stages, octane levels, features, or options may not be available for specific codes. Therefore, our website provides a general guide based on general info such as Year, Make, and Model. Our system allows you to request unavailable software, and we offer a 30-day money-back guarantee if you're not satisfied.
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APR ECU Upgrade Stages
Our ECU Upgrades are available in multiple configurations. Installation of additional performance hardware, such as an intake system, may provide further performance improvements.
APR Stage 1
The APR Stage 1 ECU Upgrade is the first step towards tuning your engine. It produces up to 455-466 HP and 329-335 FT-LBS of torque.
APR Stage 1 is available for 91 AKI, 93 AKI, and 100 AKI in North America, and 95 RON, 93 RON, and 104 RON in the rest of the world.
Horsepower and Torque Dyno Charts
| Select a Dyno | Select a Dyno Type |
|---|---|
APR Calibration Report
| Stage | HP | TQ | Max Gain | Max Gain |
|---|---|---|---|---|
| Stock As Reported by VAG | 450 HP | 317 FT-LBS | ||
| Stock As Measured by APR | 450 HP | 324 FT-LBS | ||
| Stage 1 | ||||
| 91 AKI / 95 RON | 455 HP | 239 FT-LBS | +9 HP | +15 FT-LBS |
| 93 AKI / 98 RON | 458 HP | 330 FT-LBS | +10 HP | +16 FT-LBS |
| 100 AKI / 104 RON | 466 HP | 335 FT-LBS | +18 HP | +16 FT-LBS |
Only use fuel equal to or higher than specified. Never use a lower octane fuel. Always follow our fuel guide, especially with race fuel and Ethanol, where available. Dynos are for reference only. Results will vary. Contributing factors include the vehicle condition, vehicle setup, dyno type, dyno setup, environmental factors, fuel quality, and more. When describing fuels, the North American Region (NAR) uses the Anti-Knock Index (AKI), (RON+MON)/2, or (R+M)/2. The Rest of the World (ROW) uses RON. RON is Research Octane Number and MON is Motor Octane Number.
Acceleration Testing
| Stage | 0-60 MPH | 0-100 MPH | 60-120 MPH | 60-130 MPH | 1/4mi 60 FT | 1/4mi ET | 1/4mi Trap |
|---|---|---|---|---|---|---|---|
| Stock | 4.3s | 9.8s | 9.1s | 11.7s | 1.777s | 12.430s | 110.37 mph |
| APR Stage 1 (93 AKI) | 4.0s | 9.1s | 9.0s | 11.3s | 1.749s | 12.278s | 111.98 mph |
APR EMCS Program Switching
Program switching allows you to access additional program modes and features from your cruise control stalk or your smart device with APR Mobile. Depending on the ECU, available memory, and selected options, up to four program modes and all features, can be installed.
- Stock Mode - Go back to the stock power levels.
- Performance Modes - Switch between octanes and program modes.
- Valet Mode - Neuters the vehicle, giving the driver minimal output.
- Security Lockout - Password protects program switching.
- Anti-Theft - Password protects driving the vehicle.
- Fault Code Erase - Resets ECU fault codes and adaptation.
APR Mobile
APR Mobile installs on smartphones, tables and other devices, and connects wirelessly to your ECU. The app can then be used to access features such as program switching, fault code reading and resetting, and high speed data logging.
The APR Difference
Who we are - We’re a global automotive engineering firm nestled in Opelika, Alabama. Our 80,000ft² state-of-the-art facility is home to some of the best engineers in the industry, who have mastered hundreds of engine management systems. We have multiple engine and chassis dynos, and the resources necessary to create our ECU Upgrades in-house, from the ground up! We're not a new company either. We've been around since the 90's and we have a strong financial backing to ensure we'll be here to support you for decades to come!
What we do - We optimize everything to make your engine more powerful. We adjust air-fuel ratios, advance ignition, increase boost pressure, alter cam positions and lift profiles, and more, all depending on the type of engine and management system, of course! We don’t take shortcuts, and we don’t take risks. We do it the right way.
How we differ - With our proprietary calibration and direct ram access data logging tools and operating system code changes, we’re able to make some of the strongest and fastest ECU upgrades, without needing costly end user adjustments. We work with the ECUs intelligent modeling and closed-loop systems, and beta test in multiple environments to create upgrades that work no matter where you drive!
APR Software Pricing Guide
Our performance software upgrade is available in multiple stages with optional features.
| APR Stage 1 | |
|---|---|
| APR Stage 1 ECU Upgrade | $499.95 |
| Optional Features | |
| Program Switching | $99.95 |
Purchasing, Guarantee, and Updates
Purchasing Options¹: Locate an APR Dealer. They will physically install software on your vehicle at their location. Alternatively with the APR Remote Tuning Service (RTS) you'll purchase an APR Tuning Cable and we, or a participating dealer, will remotely install software on your vehicle†.
Money-Back Guarantee: Try our Software Upgrades for up to 30 days, risk free! If you are not satisfied, have it removed and refunded.²
Free Updates: If we make an update, add a standard feature, or if the manufacturer issues an update, you are entitled to a free update.³
1. Availability: APR Software may not be available for all vehicles. Stages, programs, and features may not be available for all ECUs.
2. Money Back Guarantee: Excludes some Software Upgrades, such as those included with a hardware purchase. Labor charges are at the discretion of the installer.
3. Free updates: Subject to availability. Labor charges are at the discretion of the installer. Applicable to the original purchaser. Second hand owners may inquire with an APR Dealer about a software license transfer fee.
†. Remote flashing: Excludes APR Plus. Excludes some platforms. Dealer participation will vary. Visit our product page for details.
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*Free Shipping & Handling only offered to the contiguous US on orders over $149, excludes clearance parts and oversized packages.
Some parts are not legal for use in California or other states with similar regulations.