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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 988251, member: 8143"] Sorry but I am going to have to offer a rebuttal. The fact that water transfers heat better than air is nothing new. The air to water to air system uses air to cool air, with water as a medium between a the two. Ford went to this system to be able to regulate intake air temps better. Obviously there is no way at all to regulate a standard air to air intake temp. You have the ability to transfer less heat because it is going from an air cooler, cooling a liquid (at a higher temp than the air, because the air cannot cool less than its own temp), then the liquid cools the charge air (to a temp that's higher than its own because it cannot physically cool less). Therefore you have the loss of heat transfer through an extra medium. The middleman alway takes his cut, if that makes sense. Throw in the heat soak from the added coolant capacity and lines and other various parts that warm up and stay hot. Then add it the heat from the trans and fuel system. There is no possible way that this system can work overall at a lower temp than a properly sized air to air at the same ambient temp. I understand that the intercooler gets the priority of the cooler fluid. But it still doesn't matter, there are too many heat loads and heat soaked elements to ever out perform a standard air to air. This is far from even being close to compared to a water to air that uses supercooled water (ice water) as a fluid medium to transfer heat. Air to water to air (6.7) cooler systems have two distinct advantages; 1- they have the ability to regulate the intake temperature by a thermostatic valve, 2- they are smaller and can be made to also incorporate the cooling system for trans and fuel system. However, a properly sized "air to water to air" system cannot physically ever out perform a properly sized air to air cooler in the real world for WOT charge air temps over a sustained duration. And fwiw 200* is very toasty, but that usually comes with 1800-2000 deg EGT's. Remember, as a rule of thumb on a turbocharged Diesel engine, for every one degree you cool the intake air temp your will drop the egt by 3 degrees. That is why the 6.7 after cooler system is not the best suited for an all out performance situation like dan's was being used in. Most people do not need or will ever have to care. But most times simplicity always wins. [/QUOTE]