Product | BD Performance

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.

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, cam timing, 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 Stage I ECU Upgrade

The APR Stage I ECU Upgrade gives you higher peak numbers of 458 HP/330 FT-LBS on 98 RON octane and up to 466 HP/335 FT-LBS on 104 RON octane race fuel. As much as 18 HP and 16 FT-LBS of torque are available through the power band!

rabbit Acceleration Enhancements:
Beyond horsepower and torque enhancements, APR’s Calibration Engineers were able to increase the acceleration rate of the vehicle through other calibrations changes. Ignition delay is reduced resulting in a more responsive pedal without altering overall throttle sensitivity. Furthermore, throttle lag commonly noticed at slow speeds and while reapplying throttle has been reduced.

eco Fuel Economy:
APR’s Calibration Engineers paid close attention to several parameters directly related to fuel economy, especially while cruising at highway speeds. Depending on driving style and fuel quality, better miles per gallon may be achieved.

vmax Speed Limiter:
APR’s ECU upgrade increases the vehicle's top speed limiter for blistering sprints around the track or across the Autobahn without the speed limiter shutting down the fun.

Left Foot Braking / Brake Boosting:
APR's Left Foot Braking feature allows more control over the vehicle’s throttle. The factory equipped vehicle's throttle input is disabled while pressing the accelerator and brake at the same time. Left Foot Braking, a common motorsport driving technique, allows the driver complete control over the vehicle’s throttle and braking system, which may give the vehicle the edge it needs at the track.

APR dyno

APR Stage I ECU Upgrade Calibration Report
	Stock As Measured by Audi	Stock - 93 Octane (R+M)/2 As Measured by APR	95 Octane RON	98 Octane RON	104 Octane RON
Rev Limit	8400 RPM	8400 RPM	8400 RPM	8400 RPM	8400 RPM
Speed Limit	Max Speed Limited	Max Speed Limited	Unlimited	Unlimited	Unlimited
Peak Horsepower (HP)	450 HP	450 HP	Unmeasured	458 HP	466 HP
Peak Torque (FT-LBS)	317 TQ	324 TQ	Unmeasured	330 TQ	335 TQ
Max Horsepower Increase over Stock			Unmeasured	10 HP @ 3250 RPM	18 HP @ 7150 RPM
Max FT-LBS of Torque Increase over Stock			Unmeasured	16 TQ @ 3250 RPM	16 TQ @ 2350 RPM