Radiator Cap?

wstar

So looking around random parts sites, one of the "performance" mods I keep seeing is replacement higher-pressure radiator caps. Some of them even word it like you're going to get better cooling (and thus better performance) from installing such a cap.

My understanding is that the rating on a radiator cap is the pressure at which is will pop open and dump boiling coolant out the top of your radiator (which is a point you never want to reach, it's just a safety system to prevent blowing out some other part of the cooling system, like a hose). Assuming you're not already blowing your cap by running insanely hot, a higher-pressure cap isn't going to make a damn bit of difference to your cooling right? I'm not getting it.

__________________
7AT Track Car!
Journal thread / Car setup details