Just wondering if anyone here has mapped a stock S4/S5 ecu for use as a base map on a stand alone system?

 

You can't really do that because standalone EMS's don't have the same inputs, outputs, or processing features as the stock ECU. For example, nearly every standalone EMS uses a speed-density primary metering system, while the stock ECU uses a mass airflow primary metering system.

Digital Tuning, Inc., has researched the original ECU codes, and produced a modified chip:
http://www.pocketlogger.com/index.php?pid=rtek7feat

 

I was thinking more along the lines of injector pulse vs RPM and the same for ignition curve. Would be kind of interesting to map those and then plot them against manifold pressures and throttle position sensors of the standalone system I intend to use.