Does the chip have static timing or is it allowed to advance in the absence of knock? Or does it at least have aggressive timing if no knock is detected but retards timing if it is? If so, a fuel controller like the Apexi S-AFC should work and let the chip do its dynamic timing.
Being able to hack the chip yourself would of course be handy but I don't know of any Audi hacks that are available to the end user.
Other than that you could go stand-alone on fuel and or timing with something like the megasquirt or more advanced stand-alone.
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