I´m not really convinced that an air-air IC is more efficient than a water-air IC.Water combined with antifreeze or alcohol is a better cool medium by itself than air,especially if it is an independant system with its own cooler for the water.I´d like to see a comparison of the two on the same car with identical boost settings and then record the temp difference.The efficiency of an air-air IC is dependant on the surrounding atmospheric temperature more so than a water cooled IC.
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