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Old 08-26-2017, 02:14 PM   #50
Short Bus
FIA GT Champion
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Drives: CW '10 GTI, 6MT
Join Date: Sep 2011
Location: Texas
Posts: 927
Because I always have to understand "but why????" I did some searching and came across this explanation...

Modern gasoline engines have a maximum thermal efficiency of about 25% to 50% when used to power a car. In other words, even when the engine is operating at its point of maximum thermal efficiency, of the total heat energy released by the gasoline consumed, about 50-75% is rejected as heat without being turned into useful work, i.e. turning the crankshaft. Approximately half of this rejected heat is carried away by the exhaust gases, and half passes through the cylinder walls or cylinder head into the engine cooling system, and is passed to the atmosphere via the cooling system radiator. Some of the work generated is also lost as friction, noise, air turbulence, and work used to turn engine equipment and appliances such as water and oil pumps and the electrical generator, leaving only about 25-50% of the energy released by the fuel consumed available to move the vehicle.
So the answer to why this is happening on K04 cars is..... more fuel means more heat, it's as simple as that.

If you have a K04 and you're overheating your options are:

1. improve the car's ability to remove heat via coolant or oil (better radiator, oil cooler)
2. burn less fuel (less boost)

I know some of you are thinking yeah, DUH. But I'm sharing anyway to emphasize the point that maybe if you're going to do track events in these cars you shouldn't run the high output tunes that are created without regard for the cooling system's ability to deal with the heat generated from 15+ minutes with your foot on the floor.
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