APR TUNING APR 1.8 TFSI Gen 3 ECU Upgrade for the Audi B8.5 A4/A5 APR is pleased to present the ultimate engine control unit (ECU) upgrade for the 1.8T EA888 Gen 3 engine. APR's ECU upgrade is available in octane-specific variations and is conveniently flashed to the vehicle's factory ECU through the OBD-II port without any physical modification to the factory ECU. The ECU's Simos 12 engine management system is responsible for proper operation of the engine during constantly changing environmental and load conditions. With built in compensational data for environmental variables and varying load conditions, the factory ECU is far more complex and intelligent than units found in other vehicle makes and marques. APR's Calibration Engineers spent months calibrating the engine management system, including many hours of chassis dyno development. With a thorough understanding of the ECU's torque structure, APR's Calibration Engineers properly increased engine load to produce more power and torque across the entire power band. APR's ECU Upgrade increases boost pressure, optimizes ignition timing, cam timing, valve lift, lambda and more to produce higher output! APR's ECU Upgrades provides an excellent leap in horsepower and torque while retaining OEM knock control sensitivity and other built in safety features. This results in an exciting and powerful upgrade, optimized for various fuel grades found around the world APR's ECU upgrades are one of the best horsepower-per-dollar modifications for the new 1.8T engine. The APR Stage I ECU Upgrade is designed to work without requiring other changes to the vehicle's hardware. With the ECU Upgrade alone, APR's Calibration Experts measured higher peak figures of 288 ft-lbs of torque and 243 horsepower with 98 RON fuel. Large gains were seen throughout the power band, including an additional 70 ft-lbs of torque and 66 horsepower!