Buy a bigger radiator and intercooler, ceramic coat and fibre glass wrap your exhaust and turbine housing, shroud your radiator to intercooler and intercooler to bumper, ceramic coat your intake manifold and cold side turbo piping that sits inside the engine bay, separate your auto trans oil and coolant, run less coolant and more water on track days, raise cooling system pressure to 18-20 psi and don't sit in other cars slip streams if /when possible as air is not as dense in the slip stream.
You could try all of that and see we're it gets you?
Ralph, coolant would be released at somewhere around 13-15psi. But once released the coolant won't travel to the windscreen under pressure. It will travel there because the coolant is carried there in the flow of air. I have also been told of a bloke that ran a raised rear bonnet and got oil on his windscreen when a rod escaped the block.