We're excited to announce our Engine Control Unit (ECU) Upgrades are now available for the Audi S8 (D5) 4.0 TFSI V8 engine with the Bosch MG1 ECU! Expect massive gains with up to 685-767 HP and 731-804 FT-LBS of torque on tap, depending on octane, from this simple software upgrade. 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. Furthermore, for those looking for tuning with a limited powertrain warranty, APR Plus has you covered! Features: Delivers up to 685-767 HP with 731-804 FT-LBS depending on octane Max gains of +128-222 AWHP and +165-245 AWFT-LBS depending on octane Supports 91 AKI, 93 AKI, 100 AKI, and 104 AKI fuel grades in North America and 95 RON, 98 RON, 104 RON, and 108 RON in the rest of the world Optional factory term limit matching limited powertrain warranty with APR Plus Quicker acceleration Speed limiter removed Standing RPM soft limiter increased Left-foot braking / brake boosting added Properly rescaled performance gauges Optimized thermal management and protection Optimized launch control strategy for faster response Optimized driveline protection during launch No hardware required (Software only) Supports standard bolt on modifications Eliminated the need for a TCU upgrade to achieve full torque Flash counter does not increase with each flash Free lifetime updates Direct OBDII port flash (No ECU removal) 30 day money back guarantee APR ECU Upgrade Stages Our new suite of MG1 ECU software comes after months of extensive research and development that is typically absent from the aftermarket. Our upgrade makes the engine more powerful and more exciting. We’ve extensively calibrated the system to work flawlessly on the track, while retaining safety routines to protect your engine in the most demanding scenarios. This was all made possible by our engineering team's pursuit of perfection. Development vehicles were outfitted with additional sensors, including turbo shaft speed sensors, thermocouples, transducers, and more, along with our high speed direct RAM logging equipment, to feed valuable data to the team for analysis. After thousands of hours of testing and tuning we created new calibrations that are fine tuned for several octanes and contain hundreds of map changes, with a vast array of safety features built in. Our ECU Upgrades are available in multiple configurations. Installation of additional performance hardware, such as an intercooler or intake systems, may provide further performance improvements. APR Calibration Report Stage HP TQ Max Gain Max Gain Stock As Reported by Audi 590 HP 563 FT-LBS Stock As Measured by APR 597 HP 588 FT-LBS APR Plus 91 AKI / 95 RON 685 HP 731 FT-LBS +128 HP +165 FT-LBS Stage 1 91 AKI / 95 RON 685 HP 731 FT-LBS +128 HP +165 FT-LBS 93 AKI / 98 RON 710 HP 751 FT-LBS +158 HP +188 FT-LBS 100 AKI / 104 RON 752 HP 786 FT-LBS +203 HP +226 FT-LBS 104 AKI / 108 RON 767 HP 804 FT-LBS +222 HP +245 FT-LBS APR Plus is our APR Stage 1 ECU Upgrade with our limited powertrain warranty and it’s the first step towards tuning your engine. It produces up to 685 HP and 731 FT-LBS of torque with gains as high as +128 HP and +165 FT-LBS of torque at the wheels. Please check our warranty manual to understand modifications supported by APR Plus. APR Software Pricing Guide Our performance software upgrade is available in multiple stages with optional features. APR Plus (USA/Canada) APR Stage 1 ECU Upgrade $3,999.95 APR Stage 1 APR Stage 1 ECU Upgrade $1,499.95 APR Stage 1 ECU Upgrade from APR Plus FREE
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