The larger radiators do not increase the frontal area(height x width), they just get thicker. Going thicker is not a 1:1 payoff. As the air travels through the core it heats, which means the heat transfer reduces. So every inch you add to the thickness of a radiator does less than the inch before it did. At some point the air passing through the core reaches saturation where it is the temperature of the fluid inside of the radiator and no longer transfers heat.Haven't the guys with larger radiators still had trouble? Or are they even too small?
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Ideally, We would increase the height and or width of the cores as well as the thickness, by it is not really feasible. There isnt much room to make them taller or wider, and the fan shroud would no longer fit.