I made a funny discovery.
STCC server, UF1's at South City Classic, normal direction... I was taken out going into turn one (tight left hander) pretty heavy by what seems like 10 cars at the start of the race. So I pited and spectated the the remainder (entire) race. I can get into the low 1:03's, so I watched the first place car that was running consitant 1:02's to see what he was doing that I wasnt.
So running in first place getting 1:02 after 1:02, the only thing I found him to be doing that was that different from me, was upon entering turn one (tight left hander) he was braking at the 50m mark and slamming his car into 1st gear to slow him down...red line from hell! 4th gear to 1st gear as fast as he can, no rev matching using the engine to brake would have been disaster for a motor doing it lap after lap in real life. Now yes, its a sim, so wheres the simulated smoke when his motor would have let go?
I tried it and I cant do it for whatever reason, and if there werent any rev limiters or had proper engine malfunctions, this driver and anyone else who drives like that wouldnt be able to. Thats not sim racing IMO, more like ridge racer.