Borrowed a Performance Box today (my wife made mine disappear, first the cables, then the box itself ) and did some testing from 0-160 kph and 100-200 kph (winter tires OEM Pirelli Sottozero Winter...limited to 240 kph). Outside temperature was around 7°C, road wasn't fully dry and clean (winter weather over here) but acceptable (no snow, pavement was only very little wet with some gravel). Fuel tank was full, I was alone in the car. I also recorded some videos with a Hero GoPro 2 Cam and will post them to YouTube as soon as I have the time (videos only show speed and boost pressure though, nothing spectacular).
Here are the (average) results:
0-160 kph (without launch control, one try only): 6.57 seconds.
100-200 kph (average from several runs): 6.41 seconds.
Max. boost pressure was at no time over 1.1 bar (gauge) in these speed ranges. Overboost adds 0.15 bar, just for the book. Usually the max. boost pressure moved from 0.8 to 1.0 bar during the above trials.
I also tried a run from 100-200 kph without overboost (Sport mode off) and the result was only 0.17 seconds slower, which was kind of a surprise. I did that only once, so maybe there was something wrong but if true, the overboost doesn't really improve performance by much in the acceleration run from 100 to 200 kph.
This isn't something scientific or actually of real value but I guess it proves pretty well that customer cars run as good as test cars and there isn't much of a performance difference.
My car has 3500 km now, so with some luck, performance will improve a little bit further when I reach 5000-10000 km. Hopefully.
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RC (Germany) - Rennteam Editor Porsche 991 Turbo S, Cayenne GTS (958), BMW X3 35d (2013)