APR - Stage 3 ECU Upgrade 2.5 TFSI EA855 EVO - Audi 8V RS3, 8S TTRS

APR is pleased to present the ultimate engine control unit (ECU) upgrade for the 2.5T EA855 EVO (Gen 2) engine!

Please note that you must have APR Stage 1 or Stage 2 ECU software in order to upgrade to APR Stage 3 software.

APR’s ECU Upgrades are the best dollar-per-horsepower modification one can make to the 2.5T 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. Optional features, such as APR's EMCS Program Switching and APR Mobile are available. 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. Specific software is available for use with a high flow Race DP exhaust system and drop-in turbocharger upgrades are coming soon. Each stage is fully compatible with an upgraded intake, intercooler, catback exhaust, or other minor bolt on modifications.

Each stage includes optimizations to the factory boost gauge making it react more quickly and corrections to the power and torque gauges to match the increased output. Furthermore, we’ve added left foot braking, removed the speed limiter, raised the rev-limiter and added a motorsport limiter, reenabled the exhaust crackle on models where it was removed (2019+), adjusted the factory exhaust crackle to protect the catalyst on Stage 1 and 1+ and enabled in more scenarios on Stage 2, optimized cold start, retuned the exhaust flap actuation for the best performance and sound in multiple modes, optimized high altitude mappings, retuned the throttle for better response, and completely optimized the driving experience for street and track use making for a much more enjoyable driving experience!

APR Stage 3 ECU Upgrade
The APR Stage 3 ECU Upgrade is the next step towards making more power! This stage is available for multiple setups, and are all designed around using a drop-in turbocharger upgrade. Stage 3 has specific software for the TTE700 and GTX3582 drop-in turbo upgrades. Both require a APR TCU Upgrade, race DP exhaust system, midpipes, 980cc port injectors, turbocharger inlet system, intercooler, and NGK heat range 9 (NGK-R7437-9) spark plugs gapped to 0.024" ±0.002" or 0.6mm ±0.05mm with a change interval of 10-15,000 mi or 16-24,000 km. The TTE700 requires the included wastegate actuator. The GTX3582 requires the included turbosmart wastegate actuator and MAC 3-port solenoid. A proper 500 LPH+ @ 6 bar LPPF is required to run E85, but the stock LPFP is ok for all other fuels. The TTE700 produces 576-713 HP with 523-536 FT-LBS of torque. the GTX3582 produces 581-740 HP with 511-555 FT-LBS of torque. RHD vehicles without the turbo inlet will experience reduced output. In all cases, torque is kept flat to aid in component longevity. This stage has a optional high and low grip modes designed to reduce wheel spin and aid in 60 FT and 0-60 times depending on surface prep. Additionally this stage is available with optional exhaust crackle modes. The more aggressive modes increase the length, duration, intensity, and operating modes of the exhaust crackle. Aggressive modes are only recommended with testpipes. APR recommends NGK heat range 9 (NGK-R7437-9) spark plugs gapped to 0.024" ±0.002" or 0.6mm ±0.05mm with a change interval of 10-15,000 mi or 16-24,000 km. APR Stage 3 is available for 91 AKI, 93 AKI, 100 AKI, 104 AKI and E60-E85 Ethanol in North America, and 95 RON, 98 RON, 102 AKI, 104 AKI, 108 AKI and E60-E85 Ethanol in the Rest of the World.

APR Stage 3 Calibration Results

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.

Program 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.

Stock Mode: By selecting stock mode, the ECU calibration is reset to the factory calibration. 

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:
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.

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.

Anti-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.

Emissions
This part is legal under the provisions of EPA’s Tampering Policy dated November 23rd, 2020. The company has reasonable basis (test results) to verify that this product allows the vehicle to operate within legal emissions standards and is therefore legal to be sold for on-street use in all states that accept the legal provisions of the Clean Air Act and the EPA Tampering Policy. This product is NOT LEGAL FOR SALE OR USE IN THE STATE OF CALIFORNIA. Testing with the California Air Resources Board, in order to achieve 50-state compliance, is pending with CARB. Once testing is complete with California, and an E.O. number is issued, this product will be updated to 50-state legal status.