APR is pleased to present the ultimate engine control unit (ECU) upgrade for the 4.2 FSI V8. 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 MED 9 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 optimizes ignition timing, throttle angle, cam timing, throttle angle, 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

Stage I ECU Upgrade

Not only does our Stage I ECU Upgrade give you higher peak numbers of 444 horsepower and 357lb-ft. of torque, but also gains of up to 24 horsepower are available at higher rpms! Expect an extra 20 HP and 13 FT-LBS over stock with 95 octane, 24 HP and 17 FT-LBS with 98 octane and 25 HP and 20 FT-LBS with 104 octane fuel. Expect 20 HP and 13 FT-LBS with 95 octane, 24 HP and 17 FT-LBS of torque with 98 octane and 25 HP and 20 FT-LBS of torque with 104 octane fuel.

Dyno Performance