>>>>Important: Engine life will be very short when pushing over 9800rpm!! Only for qualifying. Don't stay for a long time near 10000rpm and avoid hitting rev limiter (which accelerates engine damage even more)
Ok, that was advice for qualifying.
FOR THE RACE: Don't go over 9500rpm if you want the 787 engine to finish a 90 minutes race.
I strongly recommend to reduce rev limiter to '9500-Sprint' position and use big radiator ('3').
If you set '9000-Normal' you will reduce fuel consumption and heating, hence can use smaller radiator.