What water temps do they run in modern F1?
I was thinking about this today, and was thinking it may seem obvious, but they probably don't run the same temp range as a production vehicle. My thought process is that if a hotter radiator will see a larger temperature delta to the cooling airflow, and therefore will transfer more heat to the air. Theoretically this allow for more total cooling potential from a smaller radiator, and therefore less drag.
However, if everything was that simple, why don't see road cars with high coolant temps, and tiny radiators? There must be some drawbacks, and these are what I thought of:
1) Higher water temps, mean higher engine operating temps. That means your tolerances would need to be designed for that higher operating range. A road car needs to work at -20*, as well as at operating temp, so the lower you make that upper bound, the less range you need to cover. F1 cars on the other hand never operate below operating temp, as they pre-heat the coolant before startup.
2) Those higher operating temps will also mean you need to select materials that are stable at those temps. I know super-exotic materials like Berrylium are now banned in F1, but I still imagine they aren't using the same materials as road cars.
3) In order to go over 100*c, you need to run a pressurized system. The higher the temperature, the higher the pressures required. On a road car, a system with super critical 500* water would be a huge safety hazard. On F1, that's probably more acceptable.
4) Higher operating temps would also mean more heat transfer to the in take air through the intake manifold itself. This can probably be mitigated with heat shielding though.
5) Higher operating temps could also cause combustion issues. Wouldn't pre-detonation be more likely when your air-fuel mixture meets a hotter piston/cylinder head?