Quote:
Originally Posted by SeanWRT
I was offered a free HPDE by BMW China at Shanghai F1 circuit on June 25. Will do a few tests.
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Shanghai F1 is a 5.4km(3.4mile) long, very horsepower and brake demanding circuit (think Monza with Italy). There are 16 turns and the longest straight is 1.2km(3/4 quarter mile). see this:
https://en.wikipedia.org/wiki/Shangh...tional_Circuit
Our group consisted of 1 E92 M3, 6 F80/82 M3/4 and 3 F87 M2. Each one of us did three 20-min sections.
It was a very hot day - the ambient 37.5C(100F) and 58% humidity (so it feels like 110~115F). One Jb4ed M4, melted his EWG wiring, went into limp mode in the first section and had to set to map 0 to finish the rest.
I pushed pretty hard and made the fastest lap of the day. I am not a pro racer, though holding the national B class racing license, I'm not your average driver either
Brake rotor temp, at pit after cooling down lap, is still 800+C/1500+F. I think I didn't cool it well, as I still wanted to push at my cooling lap LOL. Tire temp is 80C/176F@37psi. My front is still stock PSS, it did a pretty nice job overall, though a little understeer was experienced.
From datalog the IAT maxed at 130+F (timing is capped out most of the time), oil/coolant temp is below 240F. At the end of the last section, my fuel tank had only 30km/14mile fuel left. The car ran rock solid.
The 1.2km long straight on such a hot day was the best place to demonstrate M2 M4 power difference.
Stock M2 reached 215kph at brake point.
FBO Flashed M2 on stock turbo barely see 225kph.
Stock M4 ZCP is 235kph. (10kph makes a big difference)
My car and one BM3 STG2 M4 did 245kph, the fastest of the group.
Above numbers were gotten with air con turned on.
A few pictures.