The major issues that I have with the tune (and are not a problem on the "stock mode" map, nor were they a problem for the first several days after the tune was initially flashed) are generally:
- Rough behavior coming to, and leaving from, a stop, where the DSG feels overly grabby, like the engine doesn't respond as quickly as the DSG expects it to, which can lead to one or two rounds of the DSG grabbing hard, revs drop, DSG releases, then grabs again and eventually takes off, or when coming to a stop, the DSG seems to try to hold onto the clutches for too long and pulls the engine RPM excessively low with significant vibration
- Too much torque being reduced when a shift command is ordered (in M mode), especially at partial throttle, and shifts 1-2 and 2-3, causing an unexpected relative decceleration that can be nauseating to passengers, as well as occasional rough shifts (abrupt momentary decelleration) at WOT above 3500 RPM, where it feels like the motor reduces torque for longer than the DSG expects it to
- Especially at low speeds in second gear (first gear is pretty much unusably laggy), consistently noticeable and sometimes excessive delay between accelerator pedal inputs and engine response, especially from transitioning coasting to part-throttle, where in the extreme case a small accelerator pedal movement (then holding it at the same position), will go from hardly any acceleration to tire-squealing over the course of 1-2 seconds, usually resulting in way more power than I thought I was going to get. The delay is even present at manifold vacuum, so it's not just boost-related. However, reducing accelerator pedal input is immediately responsive, which makes it very hard to modulate the throttle to get the amount of torque I actually want.
- A strange "dead-spot" between 2700-4000 RPM in 2nd, 3rd or 4th gear at between 10 and 0 in-Hg vacuum (according to my boost gauge), where torque feels like it drops off a little and a very growly/clattery/knock-y sound is continuously made by the engine, and pressing the accelerator further into 0-5 PSI boost at the same RPM cleans up the sound and there feels like a sudden step change of more torque. Oddly this does not seem to be an issue at highway speeds in gears 5 and 6.
- Most noticeably at highway speeds, a very repeatable boost "overshoot/hunting" when making an accelerator pedal step change to anywhere over around 5 psi of boost, where the boost will reach or overshoot the target, then drop below the target, then more slowly rise back up to the target, with what feels like a 0.5-1 second time constant, and sometimes oscillating two or three times before stabilizing, and this can be felt as well
- An occasional boost "fluttering" that sometimes occurs at 19+ psi (on my gauge at least) below about 3800 RPM
- At WOT between 2000 and 3000 RPM in gears 3 and up, lots of boost (15+ PSI) and very little torque to show for it
- DSG farts/burps when shifting are now very muted (when initially flashed they were very crisp and prominent, and they're more crisp now on the stock map than they were a few days ago on the tune map)
