a good setup makes a big difference also,in the first session,i wasn't able to go under 39,the second i did a38'901 with changing some little things,i'll be back on the server this afternoon ,to try to hit my time, at the moment Christopher have the best lap time, 0'600 under me ,so there's work to do !
I've hardly changed anything actually, exactly what Jai describes, wing down, less engine cooling, boost map up to 5 and set the gears straight and voila: flatout all the way
with the rad opening at 1,i've done 4 laps with no problems,i had 4 laps of fuel.your car only smoke a little but it's not a problem since nobody follow you