I've been searching like hell through all of the threads on "down on power" and really don't recall seeing any that definitively state what fixed the problem - save one that referred to an "overlay" between the N75 and ECU. Many talk about what they are going to look into and the last post on the thread is someone reminding the OP to please post the solution.
Here's what I've observed: Comparatively sluggish 0-60 times, in the range of 5.4-6.0. New IC's improved the feel noticeably but stopwatch says sluggishness remains. This in 45F weather.
Here's the car:Mostly stock RS6, MTM TCU (18 mos. ago), ITG filters (1mo, ago), new Apikol Intercoolers (OEM's were leaking badly), with Silicone hose kit 93 Octane fuel.
Here's what's been done recently:new ITG filters, recent tranny flush, fluid looked good, IC replacement req'd partial drain, fluid still looked good, 55k svc (plugs replaced), new Apikol IC's and Venair silicone hose kit.
Here are today's logs:
Prior to the IC's replacement I logged some tranny data and nothing looked off, RPMs and MPH stayed in lock step, no slip or funny shifting or "plateauing" of speed or RPM's.
I see a number of possible issues but would like to hear from anyone that has actually solved the problem.
It doesn't like the length of my logs so posting separately.