[Datka]

So I took my 135i n55 /DCT to thunderbolt yesterday and had similar issues as many in this thread.
Was a hot day 85F high humidity. Was pushing the car very hard as always and was losing power with no warning signs at all.
I have bigger intercooler, cobb tune satge1+ as far as power mods.
Coolant mixed with distilled water 50/50.
Heater was turned on at max speed. TC off completely, stock e diff.
I don't short shift as some of you suggest here, because if I do, I will get run over by fast drivers in advanced/instructor run group.
Now I don't know what is exactly going on, but I did notice that in a cooler weather, lets say no more than 70F, I have no problem at all with power loss or anything else.
My best lap time in april (much cooler conditions) on direzza star spec tires was 1.37.05. Now to compare that time with my best lap time from yesterday-1.37.45.
I was testing my new bridgestones RE71R, and would be running 1.34, if not for fighting with slight power reduction throughout the whole day.
These tires are amazing. I was able to take corners at speed I would never imagine was possible on street tires.
So any suggestions how to deal with my issue?