I am not an A6 expert here but it does sound like that the ECM or PCM, whatever GM is calling it now, is pulling timing and/or fuel from the Torque Management limits on the A6 while you are power braking. I have spoken to many of the folks running the A4 when I tuned my LS1 M6 and apparently that Torque Management can pull timing and/or fuel when it senses to much stress from Torque at the converter/shaft area. This is why I stuck with an M6 because for me it is just to much trouble to modify and tune the A6 tranny to compensate for engine and gear mods and it posses a risk of prematurely ejaculating the tranny
. The Torque Management is there to help the tranny last longer and when you remove it through a tune you expose it to excessive wear and tear and significantly reduce the longevity. However one could simply reduce the Torque Management limits and not Remove it, this would help with the performance without a total exposure to excessive wear and tear. I suppose if I had the A6 I would pop over to the Vette forum to see how they are handling this??? Just a thought for those A6 drivers who want better performance.
