APR is pleased to present the ultimate engine control unit (ECU) upgrade for the 4.0 TFSI 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 increases boost pressure, 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.
The APR Stage I ECU Upgrade gives you higher peak numbers of 667 HP/697 FT-LBS on 93 (R+M)/2 octane and up to 692 HP/713 FT-LBS on 100 (R+M)/2 octane race fuel. As much as +171 HP and +191 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.
Increased 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.
peed 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:
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.
| Stock As Reported by Audi | Stock - 93 Octane As Measured by APR | APR Stage 1 - 91 Octane | APR Stage 1 - 93 Octane | |
|---|---|---|---|---|
| - Max increases are based on APR's actual measured stock values and not those reported by VW. | RON = ROW Fuel Grades | AKI = North American (RON+MON)/2 Fuel Grades. | ||||
| - Reported wheel figures measured on APR's in house Dynapack Dynamometer with a US Spec 2013 S8 Tiptronic, using SAEJ1349 correction and an average of multiple runs. Crank figures are estimated based on the measured wheel figures. Results may vary depending upon environmental conditions, vehicle, transmission, vehicle health, operating conditions, temperatures, fuel grade, dyno type, dyno setup, other variables and other modifications. | ||||
| Rev Limit | 6,400 RPM | 6,400 RPM | 6,400 RPM | 6,400 RPM |
| Speed Limit | Max Speed Limited | Max Speed Limited | Unlimited | Unlimited |
| Peak Horsepower (HP) | 520 HP | 577 HP | 646 HP | 667 HP |
| Peak Torque (FT-LBS) | 481 TQ | 556 TQ | 656 TQ | 697 TQ |
| Max Horsepower Increase over Stock* | +121 HP @ 5,200 | +146 HP @ 5,200 RPM | ||
| Max FT-LBS of Torque Increase over Stock* | +134 TQ @ 4,400 | +174 TQ @ 3,800 RPM |
| Program Mode | 0-60 MPH | 0-62 MPH | 0-100 KPH | 0-100 MPH | 60-120 MPH | 62-124 MPH | 100-200 KPH | 60-130 MPH | 30-130 MPH | 1/4 60 | 1/4 ET | 1/4 Trap |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Data collected at the same location via a Racelogic P-Box with ESP/ASR off, Dynamic mode and Sport mode. May not be comparable to data collected in other locations. | ||||||||||||
| Stock 93 Octane (R+M)/2 | 3.759 | 3.950 | 3.963 | 8.723 | 8.794 | 9.667 | 9.729 | 11.473 | 13.594 | 1.837 | 11.909 | 116.76 |
| APR Stage I 93 Octane (R+M)/2 | 3.387 | 3.542 | 3.552 | 7.489 | 7.257 | 7.841 | 7.882 | 9.271 | 10.978 | 1.769 | 11.174 | 123.01 |
| Stock vs APR 93 (Seconds Faster) | 0.372 | 0.408 | 0.410 | 1.233 | 1.537 | 1.826 | 1.847 | 2.202 | 2.616 | 0.068 | 0.753 | 6.250 |
| Stock vs APR 93 (Percent Faster) | 9.89% | 10.33% | 10.36% | 14.14% | 17.48% | 18.89% | 18.99% | 19.19% | 19.24% | 3.70% | 6.17% | 5.08% |
| Vehicle | Market | Engine | Transmission |
|---|---|---|---|
| Audi S8 (D4) | All | 4.0 TFSI | All |
