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Originally Posted by JoeFromPA
I agree with you here but I'd like to know how much of that capacity is used up just by sitting still or warming up at the track and at what rate the heat is 'bled off' when driving full bore at a given MPH.
Hope that makes sense. An air to air intercooler heat soaks easily but also gets rid of heat soak quickly. A water to air intercooler does not heat soak easily but nor does it shed heat as easily. Let's identify the rates.
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Good point. The inverse is also true, due to the high specific heat of water, once heat soaked, a water system needs a lot of air to cool down.
To prevent heat soak, usually the radiator will be significantly larger than the intercooler, hence, in principle, there is more heat extraction capability in the system than there is to add heat (temperature delta and mass flow is also part of the equation). If BMW have done their homework right (which I suspect they did), the F8X intercooler should not heat soak.