When to use a higher pressure rad cap?

[Trueweltall]

3psi difference = roasted

Also stay away from TRD radiator caps, they will totally ruin your coolant system.

[15limited]

But its TRD breh

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[Pat]

I have a Jackson Racing rad cap for sale. Only $300.
#tunerlyfe #zomgpowers

[rice_classic]

I recently read an article on why the NASCAR teams run 290 degree water temps at very high pressures and that's because it allows them to run with the front grill mostly taped off for better aero. In qualifying they will entirely cover the grill, often blowing out water toward the end of qualifying.

For us plebeians... the only reason I could see wanting a high pressure cap is for the road race car where I could spend several laps in a tight draft. The tight draft take a LOT of air away from my cooling system and temps can spike - having a little extra wiggle room in terms of boiling point in that momentary condition is good. The water is hottest at the end of its loop as passes the last exhaust valve and if your system temp is below the boiling point but the water at that very localized exhaust valve area could still cavitate and lead to problems. On my inline 4 in the previous car I warped the head at Cyl 1 on several occasions and finally jumped to a more robust cooling system overall - however a high pressure cap may have also been a workable solution but ultimately I wanted to be able to run in a draft for 30 minutes if the race dictated the necessity.