That is exactly what my tuner told me, who specializes in these engines. He told me it's normal for the TFSI and that I shouldn't be trying to fix something that aint broken when it comes to these engines specifically.
edit: this is a different tuner from the one I had up till now. After I kept bugging the old one about how sh*t my car was running, he just up and blocked me cause he was also in the process of moving shop. Why did I go with him in the first place? cause I didnt know anyone who knew these engines in my area, while he claimed that he's been doing them for 20 years and because I was a broke college student at the time so money was an issue.
We went through the map with this new tuner and basically it was awful. The engine was running so lean it was literally begging to be killed. He messed with the VVT values to make the car sound louder, he messed with the ESP skid control values to make the car much more likely to spin wheels. He messed with the wheelspin part of the ESP unit, making it a hardcut limiter so every time I'd start spinning, it'd cut power, let off boost and then resume. When on the highway and using the cruise control to increase speed, the car would go into full boost, then let off boost, then full boost, then off boost again, basically jerking you back and forth as it was trying to accelerate. Under hard acceleration in 3rd or 4th gears, the car would jerk left and right, losing traction here and there, trying to drag you side to side. The engine was also overall much louder at idle, at normal driving, at hard acceleration etc. The boost was also not controlled whatsoever. He basically set the boost from 2.5k all the way to redline to be 1.55 bar. He also changed the values the gas pedal was seeing. When it was at 30%, it was giving 55%. When at 50%, it was giving 99% or something along those lines.
With the new tune the new guy reverted back to the stock N75 values, reverted back the VVT changes as I've seen the car at times go as high as 32 degrees, set the boost to 1.4 and I forgot how much at redline but much lower. He also made some changes to the ESP when accelerating so now with ESP on it feels like I'm driving on snow. I can floor it, the ESP light will flash but the car wont cut out, wont jerk, it will just get up to speed with minimal to no wheel spin. Also no more wheel hop whatsoever. The car is also a lot more quiet overall, both under full load and when just driving normally.
The only thing I dont like is how the turbo no longer makes that stututu sound when I let off the gas since that was the most unique part about it imo. Once I'm done with the anti surge core conversion, he said he'll add back the stututu.
