APR TCU Upgrade for the ZF 8-Speed (AL552) B9 S4/S5/SQ5

09/21/2023

APR TCU Upgrade for the ZF 8-Speed (AL552) B9 S4/S5/SQ5

09/21/2023

APR's TCU Upgrade dramatically improves upon the transmission's function, drivability, and performance through a myriad of enhancement and custom features. Normal daily driving is smoother as we've improved upon the normal quirks and complaints associated with the driving experience. Sporty driving is far more capable with increased torque capacity, clamping pressure, torque management during shifts, AMAX in all gears, and optimized shift point! Both scenarios are optimized to deliver faster acceleration by matching the power output delivered by our ECU Upgrades. Lastly, the software loads to the factory TCU through the OBD-II port, resulting in a clean and headache-free install.

APR TCU Upgrade

  • Optimized shift points for faster acceleration and smoother driving
  • Shift points for both stock and big turbo setups at no additional charge
  • Increased maximum allowable torque for higher output
  • Increased clutch clamping pressure to hold more torque
  • Optimized torque management during shifts for smoother and stronger shifts
  • AMAX maximum acceleration shifting mode enabled on all gear shifts
  • Increased maximum RPM on big turbo software
  • Works perfectly with our ECU Upgrades
  • Flash counter does not increase with each flash
  • Direct OBDII port flash (No TCU removal)
  • Free lifetime updates
  • 30 day money back guarantee
APR TCU Upgrade

APR ECU Upgrade

  • Delivers up to 411 HP with 551 FT-LBS (APR Plus)
  • Delivers up to 411-491 HP with 551-629 FT-LBS depending on octane (APR Stage 1)
  • Max gains of +103 AWHP and +190 AWFT-LBS (APR Plus)
  • Max gains of +103-171 AWHP and +190-249 AWFT-LBS depending on octane
  • Supports 91 AKI, 93 AKI, 100 AKI, 104 AKI, and E60-E85 fuel grades (APR Stage 1)
  • Optional factory term limit matching limited powertrain warranty with APR Plus
  • Standing RPM soft limiter increased
  • Left-foot braking / brake boosting added
  • Properly rescaled performance gauges
  • Optimized launch control strategy for faster response and boost building
  • Optimized driveline protection during launch
  • Optimized thermal management and additional protection
  • Optimized exhaust crackle temperature safeties
  • Optimized high-gear LSPI protection and turbocharger protection added
  • Optimized the factory volumetric efficiency low end torque fluctuation
  • Speed limiter removed
  • Increased rev limiter for use with TCU upgrades
  • Exhaust flaps recalibrated to provide better performance and increase sound during free-rev
  • Auto start-stop defaults to the off position
  • No hardware required (Software only)
  • Supports standard bolt on modifications to further increase outpu
  • 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

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