So I just got my .'11 135i a few weeks ago. Incredibly, I found the previous owners maint. receipts in the glove box. It shows it had the SIB 12-15-14 done previously under warranty. Apparently she complained about the idle problem with the AC on and they did the update.The idle is solid with the AC on or off. No stalling or near stalling.
I don't seem to have any popps and gurgles tho. To be honest its pretty quiet inside the cabin.
The only thing it does have is a bit of throttle tip in lag at stop lights, + the rolling slow then on-the-gas lag (i.e. doesn't like doing CA stops). It is better with the sport button on.
It would be great if there was a way to turn off the adaptation learning. My old E60 had silly learning issues also (different sort but there none the less). I don't really see any advantage to the learning. Its an odd concept... We as humans learn or adapt to things. So if the car drives a certain way we adapt to it. If it needs X about of throttle at a light to get going we learn how much and give it that much. Instead, the car is trying to learn for us so it is adapting to our inputs and our natural tendency to learn and adapt is then screwed up b/c the car isn't working the same way all the time.
For example, maybe I need to slowly get on the gas to ease forward a bit to see better before I go. Next light I need to go a bit quicker to get in front of someone. Two different situations and our own actions adapt to it. If the car is trying to adapt well...
Wonder if a coder could figure out how to turn it off permanently.