APR Audi C7 S6/S7 4.0 TFSI V8 ECU Upgrade

engineAPR is pleased to present the ultimate engine control unit (ECU) upgrade for the 4.0 TFSI engine!

APR’s ECU Upgrades are the best value modification one can make to the 4.0T engine. 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 software loads to the factory ECU through the OBD-II port, resulting in a clean and headache-free install. Furthermore, for those looking for tuning with a limited powertrain warranty, APR Plus has you covered!

APR ECU Upgrade Stages

APR’s ECU Upgrades are available in multiple stages, supporting various octanes both with or without any hardware modifications. All stages are fully compatible with an upgraded intake, cooling system, catback exhaust, or other minor bolt on modifications. APR Stage II software is available for a high flow Race DP exhaust system and Stage III software is available for use with upgraded RS6 and RS7 turbos.

APR Stage I ECU Upgrade

The APR Stage I ECU Upgrade requires no hardware modifications and is available with 553-578 HP and 588-635 FT-LBS of torque, depending on octane. Gains as high at +108-138 HP and +155-198 FT-LBS of torque are available throughout the power band!

APR Stage II ECU Upgrade

The APR Stage II ECU Upgrade requires a high flow Race DP exhaust system and is available with 575-614 HP and 669-717 FT-LBS torque, depending on octane. Gains as high as +164-284 HP and +236-207 FT-LBS of torque are available throughout the power band! This software must be used with a high flow Race DP exhaust system.

APR Stage III (RS Turbos)

This ECU Upgrade requires the factory turbochargers from the RS6 and RS7. Full details can be found on our product page. Expect 599-707 HP with 617-714 FT-LBS of torque. Gains as high as 140-224 HP and 178-224 FT-LBS of torque are available throughout the power band.

Dyno Testing
Select A Graph Select Graph Type
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR dyno
APR Calibration Report
Stage ROW Fuel Max HP Max TQ Max HP Gain Over Stock Max TQ Gain Over Stock
- APR recommends and tuned with Sunoco GT 260 for 100 AKI mode and Sunoco GT 260 Plus for 104 AKI mode. Never use lower octane than specified by the mode.
- Max increases are based on APR's actual measured stock values and not those reported by VAG. | RON = ROW Fuel Grades | AKI = North American (RON+MON)/2 Fuel Grades.
- Reported wheel figures measured on APR's in house Dynapack Dynamometer with a US Spec 2013 S7 S-Tronic, using SAEJ1349 correction and an average of multiple runs. Crank figures are estimated based on the measured wheel figures. Results may vary depending upon environmental conditions, vehicle, transmission, vehicle health, operating conditions, temperatures, fuel grade, dyno type, dyno setup, other variables and other modifications.
Stock As Reported by Audi 95 RON 420 HP 406 FT-LBS    
Stock As Measured by APR 98 RON 480 HP 451 FT-LBS    
APR Plus 95 RON 553 HP 588 FT-LBS +108 HP @ 3,850 RPM +155 FT-LBS @ 3,500 RPM
APR Stage I 95 RON 553 HP 588 FT-LBS +108 HP @ 3,850 RPM +155 FT-LBS @ 3,500 RPM
APR Stage I 98 RON 563 HP 627 FT-LBS +125 HP @ 3,800 RPM +187 FT-LBS @ 3,250 RPM
APR Stage I 104 RON 578 HP 635 FT-LBS +138 HP @ 3,850 RPM +198 FT-LBS @ 3,350 RPM
APR Stage II95 RON 575 HP 669 FT-LBS +164 HP @ 3,850 RPM +236 FT-LBS @ 3,450 RPM
APR Stage II 98 RON 586 HP 694 FT-LBS +176 HP @ 3,850 RPM +258 FT-LBS @ 3,350 RPM
APR Stage II 104 RON 602 HP 713 FT-LBS +196 HP @ 3,950 RPM +280 FT-LBS @ 3,450 RPM
APR Stage II 108 RON 614 HP 717 FT-LBS +207 HP @ 4,100 RPM +284 FT-LBS @ 3,550 RPM
APR Stage III RS Turbos 95 RON 599 HP 617 FT-LBS +140 HP @ 4,650 RPM +178 FT-LBS @ 3,750 RPM
AAPR Stage III RS Turbos 98 RON 634 HP 671 FT-LBS +180 HP @ 4,750 RPM +238 FT-LBS @ 3,600 RPM
APR Stage III RS Turbos 104 RON 671 HP 708 FT-LBS +209 HP @ 4,850 RPM +276 FT-LBS @ 3,500 RPM
APR Stage III RS Turbos 108 RON 707 HP 714 FT-LBS +224 HP @ 4,850 RPM +280 FT-LBS @ 3,550 RPM

Acceleration Testing

Acceleration Videos

APR Stage 1 vs Stock

Drag Strip Video

Drag Strip Video

Acceleration Testing

Dyno testing is a great way to gauge power increases over the entire rev range but may not translate to real world performance. Through GPS based acceleration testing, APR’s Engineers were able to verify increases made on the dyno translated to a faster and quicker vehicle on the street.

APR Acceleration
APR Acceleration Tests
Program Mode 0-60 MPH 0-100 MPH 62-124 MPH 60-130 MPH 1/4 60' 1/4 ET 1/4 Trap Speed
Data collected with version 1.0 at the same location via a Racelogic P-Box and at an IHRA Certified Drag Strip with 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 4.06 sec 9.24 sec 9.56 sec 11.32 sec 1.713 sec 12.216 sec 112.42 MPH
Best Measured APR Stage I - 93 (R+M)/2 Octane 3.52 sec 8.32 sec 8.51 sec 9.93 sec 1.656 sec 11.628 sec 117.83 MPH

APR ECU Upgrade Included Features

APR World Class Calibration Expertise


Tuning 101:

The 4.0T engine uses a Bosch MED 17 ECU for engine management. Basically, it’s a computer that tells the engine how to operate. Tuning software, like the APR ECU Upgrade, tells the engine how to make more power. It does this by running more boost pressure, optimizing the cam shaft positions, adjusting the air/fuel ratio, advancing ignition timing, and more.

A Better Engine Management System:

The 4.0T’s ECU is incredible. Without the driver knowing otherwise, the ECU makes intelligent adjustments to the engine’s operations to keep it running smoothly. Unlike ECUs found in many other makes and models, when properly tuned, the ECU eliminates the need for custom tuning to maximize output, even when weather conditions change dramatically.

How APR Differs from the Competition:

The ECU is powerful, but extremely difficult to master. Without mastery, the ECU must be simplified, removing what makes it so desirable. The result is an incomplete product that often requires end user adjustment to maximize output in limited scenarios. On the contrary, APR’s Engineers spent the better part of a decade mastering the ECU to unlock its full potential. With complete access to the thousands of maps, tables and variables within, as well as a high-level understanding of how it works, APR’s Engineers were able to take advantage of everything the ECU has to offer. Power is maximized in nearly all scenarios, eliminating the need for end user adjustments. High performance operational modes are enabled and calibrated to deliver smooth daily driving, with a snappy and responsive throttle during moments of spirited driving. Mastery of the boost control system makes for an impressively predictable driving experience as the turbo spools quickly, delivering instant power, while torque-by-gear helps protects the engine from being lugged out in tall gears. Lastly advanced high-output protection routines are enabled, allowing the ECU to make constant adjustments to airflow and fuel to cool and protect the engine, all without the driver knowing otherwise.

rabbitAcceleration Enhancements:
Beyond horsepower and torque enhancements, APR’s Calibration Engineers were able to increase the acceleration rate of the vehicle through other calibrations changes. Ignition delay is reduced resulting in a more responsive pedal without altering overall throttle sensitivity. Furthermore, throttle lag commonly noticed at slow speeds and while reapplying throttle has been reduced.

vmaxSpeed Limiter:
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 the fun.

Left Foot BrakingLeft Foot Braking:
APR's Left Foot Braking feature allows more control over the vehicle’s throttle. The factory equipped vehicle'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 vehicle the edge it needs at the track.

ecoIncreased 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 driving style and fuel quality, better miles per gallon may be achieved.

APR ECU Upgrade Optional Features

APR EMCS Programs and Features

APR’s Enhanced Modular Chipping System, (EMCS), brings selectable programs and features to the factory ECU, without the need to purchase external hardware switching devices. EMCS has the ability to completely rewrite the entire operating map data within the ECU, giving each program mode a completely different set of calibration changes. On this platform, this is contrary to the industry norm of capping limits, using multipliers, only swapping portions of a base calibration, or relying on knock activity to lower output. APR’s EMCS features and programs modes are activated via the factory OEM cruise control buttons, and optionally through APR Mobile. The vehicle’s cruise control will function normally while driving.

To learn how to activate the programs and features, choose the vehicle's cruise control type from APR EMCS Owner's Manual.

Program SwitchingProgram Switching:
Program switching allows the user to cycle through up to four different engine calibrations and operating modes all without the need for external hardware.

StockStock Mode: By selecting stock mode, the ECU calibration is reduced to factory load levels, limiting performance.

PerformanceAPR 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 eraseFault 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 lockoutSecurity Lockout:
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.

anti theftAnti-Theft:
When activated, Anti-Theft prevents normal operation of the engine 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.

Valet ModeValet Mode:
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.

APR Mobile

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.

The APR Difference

APR ECU Explorer

ECUxAPR’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 with far more variables logged at once, at very high data rates.

APR ECU Composer

ECUcAPR’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.

APR ECU Assembly

ECUsAPR’s Electrical Engineers have the ability to alter the code structure of the ECU. Through code levels changes, APR's Engineers are able to add features to the ECU. Other changes allow higher torque limits than those achievable through only modifying calibration data or using piggyback devices as is the case for many tuners. This allows APR's engineers to often not require transmission software to meet or exceed advertised gains. On the highly modified end, this often allows APR to make turbo upgrades operate without the need for external manual controllers.

APR Direct Port Programming

DirectPort ProgrammingAPR’s DirectPort Programming is now available! Any APR Dealer in the world, connected to the Internet, has direct access to APR’s latest ECU upgrades for loading directly over the vehicle's OBD-II port. This completely eliminates the need to remove and open the ECU for currently available files and can be uninstalled at any time!

Application Guide
Vehicle Market Engine Transmission
Audi S6 (C7) All 4.0 TFSI All
Audi S7 (C7) All 4.0 TFSI All
not be available for all ECUs.
Stage Minimum Requirements Price Exc. VAT Price Inc. VAT
- Optional Program Switching: A fully loaded ECU includes up to 4 program modes (stock mode, octane specific performance mode, valet, etc), as well as fault code erase, security lockout and anti-theft depending on availability and ECU compatibility.
- ECU Revision Notice: Multiple ECU revisions exist for each platform. APR software may be temporarily unavailable when factory updates are applied. An APR dealer can check availability in person, or over the phone if the ECU boxcode/revision is known.
APR Stage I ECU Upgrade None £1008.99 £1210.79
- Upgrade from APR Stage I to APR Stage II High Flow Exhaust Race DP £503.99 £604.79
- Upgrade from APR Stage I to APR Stage II (after purchasing an APR Race DP) APR Race DP No Additional Charge
APR’s RS6/7 Turbo ECU Upgrade - New Customer RS6/RS7 Turbochargers (See Requirements on Product Page) Find a Dealer
APR’s RS6/7 Turbo ECU Upgrade - Existing APR Stage I or II Customer RS6/RS7 Turbochargers (See Requirements on Product Page) Find a Dealer
- Add Optional APR EMCS Program Switching (Fully Loaded) - Contact a dealer

How to Purchase

APR DealerPlease use the APR Dealer Locater Tool to locate an APR Dealer, confirm availability and schedule an appointment.

Please note vehicle manufacturers issue many ECU part numbers and revisions throughout their vehicle lineup. As such, some ECUs may be temporarily unavailable as new parts and/or revisions are released. If the vehicle’s ECU part number and revision is known, availability can be checked at any APR Dealer.

30 Day Money Back Guarantee

guaranteeAll APR ECU Upgrades include a 30-day money back guarantee with no questions asked. If for any reason the owners is dissatisfied with the APR ECU Upgrade, they may return to the place of purchase for a full refund, provided they are within the 30 day period from the time of the 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

guaranteeAll 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.

APR Tuned

Phone: 0333 240 6823 Address: APR Tuning UK, Unit 1 Siemens Road, Manchester M44 5AH, UK

Copyright © 1997 - Present Day: APR Tuning UK. All Right Reserved

While we try to keep everything current, APR tuning Ltd is not responsible for errors in pricing on this web site. All prices are in GBP and are applicable to the UK only.