APR 4.2L FSI V8 ECU Stage 1 Upgrade

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$499.95

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. APR’s EMCS functionality puts the control of the engine’s operation at your fingertips and allows for additional features and options to be installed to the OEM ECU.

The ECU’s MED 17 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.

The APR Stage 1 ECU Upgrade gives you higher peak numbers of 458 HP and 330 FT-LBS of torque on 93 (R+M)/2 octane and up to 466 HP and 335 FT-LBS on 100 (R+M)/2 octane race fuel. As much as 18 HP and 16 FT-LBS of torque are available through the power band. 

All APR Software upgrades are only available at our Joplin, Missouri retail location. In order to receive an APR software upgrade, please click here to schedule an appointment. You may either add this item to your cart and purchase online, or may also pay in store. 

VEHICLE APPLICATION GUIDE

 Vehicle Engine Transmission
Audi RS4 (B8.5) 4.2L FSI V8 All
Audi RS5 (B8/B8.5) 4.2L FSI V8 All