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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.
he APR Stage I ECU Upgrade gives you higher peak numbers of 458 HP/330 FT-LBS on 93 (R+M)/2 octane and up to 466 HP/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!
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.
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.
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 Stage I ECU Upgrade Calibration Report | | Stock
As Measured by Audi | Stock - 93 Octane (R+M)/2
As Measured by APR | 93 Octane (R+M)/2
98 Octane RON |
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| Rev Limit | 8400 RPM | 8400 RPM | 8400 RPM |
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| Speed Limit | Max Speed Limited | Max Speed Limited | Unlimited |
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| Peak Horsepower (HP) | 450 HP | 450 HP | 458 HP |
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| Peak Torque (FT-LBS) | 317 TQ | 324 TQ | 330 TQ |
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| Max Horsepower Increase over Stock | | | 10 HP @ 3250 RPM |
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| Max FT-LBS of Torque Increase over Stock | | | 16 TQ @ 3250 RPM |
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Acceleration Testing
| Program Mode | 0-60 MPH | 0-100 MPH | 60-120 MPH | 60-130 MPH | 1/4 Mile 60 FT | 1/4 Mile ET | 1/4 Mile Trap |
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| Data collected at the same location via a Racelogic P-Box and at an IHRA Certified Drag Strip with 93 (R+M)/2 fuel, launch control, ESP/ASR off, Dynamic mode and Sport mode. May not be comparable to data collected in other locations. |
| Best Measured Stock - 93 (R+M)/2 Octane | 4.3 sec | 9.8 sec | 9.1 sec | 11.7 sec | 1.777 sec | 12.430 sec | 110.37 MPH |
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| Best Measured APR Stage I - 93 (R+M)/2 Octane | 4.0 sec | 9.1 sec | 9.0 sec | 11.3 sec | 1.749 sec | 12.278 sec | 111.98 MPH |
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Application Guide | Vehicle | Market | Engine | Transmission |
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| Audi RS4 (B8.5) | All | 4.2L FSI V8 | All |
| Audi RS5 (B8/B8.5) | All | 4.2L FSI V8 | All |
IMPORTANT AVAILABILITY DETAILS:- Program Switching: A fully loaded ECU includes up to 4 program modes (stock mode, performance modes, valet, etc), as well as fault code erase, security lockout and anti-theft depending on availability and ECU compatibility.- Availability and ECU Compatibility: Stages, programs, and features may not be available for all ECUs.- ECU Revision Notice: Multiple ECU revisions exist for each platform. APR software may be temporarily unavailable when factory updates are applied. An APR dealer can check availability in person, or over the phone if the ECU boxcode/revision is known.
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