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Originally Posted by gsrbri
My original point was just that it's a bit of novelty to see how thermally-efficient systems work. However, water-to-air intercoolers are more thermally-efficient than air-to-air (and are easier to package...esp in the case of the M5/M6) but when ambient air temps are high, not much you can do other than try to drive intake temperatures to ambient (still hot if it's 95 deg F outside). The M4 system is more carefully designed for more efficient cooling than the M5/M6 system, due to redundant intercoolers (two) and volume of the system.
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The M5/6 system is in a much more optimal position cooling wise and the actual intercooler cores are significantly larger . I ran 4 20 min sessions in 95 degree heat at Roebling road raceway with no temperature issues and max oil temps under 250 . No matter how good an air to water system a car has ( and this one is excellent) it certainly wasn't "cool to the touch at the end of a session when ambients are 90 lol . If they are you are the slowest driver on the planet and or you're car denies physics .