Audi B6 S4 4.2L V8 ECU Upgrade
APR is pleased to present the ultimate engine control unit (ECU) upgrade for the 4.2L V8 engine. 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 Bosch Motronic 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, lambda and more to produce higher output. Using APR’s proprietary high-speed data logging suite, the calibration team closely monitored the effects of these changes to help ensure an enjoyable driving experience.
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!
|Year||Model||Engine||91 Octane Chipped||93 Octane Chipped||Price|
|*Speed and Rev Limt changes only.|
|2004-2005||S4||4.2||*||352hp / 312lb-ft||$599.00||Buy One Now|
All of the options below are included with purchase.
|¹Prices applicable to the North American market only.|
|²Due to many variations between ECU's some programs/options may unavailable.|
|For a total of 2 programs (i.e. - Stock and Chipped)¹ ²||$149¹ FREE!|
|For a total of 3 programs²||$219¹ FREE!|
|For a total of 4 programs²||$289¹ FREE!|
|¹Prices applicable to the North American market only.|
|²Due to many variations between ECU's some programs/options may be unavailable.|
|Security Lockout²||$59¹ FREE!|
|Fault Code Erase/Throttle Body Alignment (FCE/TBA)²||$59¹ FREE!|
|Anti-Theft System²||$199¹ FREE!|
EMCS is APR's revolutionary Enhanced Modular Chipping System. EMCS is an industry leading technology that brings many new features to the automotive enthusiast. This technology was developed exclusively by Audi Performance & Racing, LLC and demonstrates APR's continued commitment to lead the industry with the most technologically advanced products available.
Want chipped mode? Want to be able to switch back to your stock settings? Want a race mode to run 100 octane fuel at the track? How about a valet mode that limits power? EMCS is the lone technology on the market that can give you all of these options. No changing of the chip or ECU is required. These programs are available at the touch of a button.
Others have attempted to imitate EMCS with external switching devices that only replace portions of a "base" calibration. EMCS is still the only Bosch Motronic Engine Management System enhancement that gives the ECU the ability to completely rewrite the entire operating map data when selecting different programming options. This allows for completely new and independent calibrations for each program selected giving you the best, most powerful and complete Stock Modes, 91, 93 and 100 octane Performance Modes and Valet Modes.
APR's EMCS features and program modes are activated via your OEM cruise control buttons. Your cruise control will continue to function as normal, but will give you the ability to scroll through the programs you have purchased with your APR ECU Upgrade. The procedure is simple and involves only two steps.
How EMCS Works
Press and hold the "set" button on your cruise control. After approximately five seconds, the "check engine" light on your dash will begin to blink once per second. This will tell you that you are activating program one. This blinking sequence will continue for approximately five seconds.
After this five second interval, the "check engine" light will begin blinking twice per second. This will indicate that you have activated the second program. This process is continued to access any remaining programs you may have purchased. (three blinks = program three, four blinks = program four).
Once you have activated the desired program, simply release the "set" button. The "check engine" light will stop flashing. Turn the ignition key off for 10 seconds, turn the key back on, and you will be locked in that program until you change it again.
It's that simple.
APR's EMCS is a truly modular system that allows for future enhancements and features to be added as they are developed without the need for additional hardware. EMCS makes the following advanced features possible:
How to purchase
Please use the APR Dealer Locater Tool to locate an APR Dealer, confirm availability and schedule an appointment.
Please note vehicle manufacturers issue many ECU part numbers and revisions throughout their vehicle lineup. As such, some ECUs may be temporarily unavailable as new parts and/or revisions are released. If the vehicle’s ECU part number and revision is known, availability can be checked at any APR Dealer.
Security, Warranty and Money Back Guarantee
All APR ECU Upgrades include a limited lifetime warranty against defects in the software and to provide free updates and reflashes as they become available. Installation may be additional and is not included in the warranty.
All APR ECU Upgrades offer a 30 day money back guarantee with no questions asked. If for any reason you are unhappy with your APR ECU Upgrade you may return the upgrade to your place of purchase for a full refund provided you are within a 30 day period from your time of initial purchase. Installation is not included in the guarantee and is at the discretion of the place of install.