Physical Contradiction Leads To High Level Invention

Application of turbocharger on a car engine significally improve its perfomance and power generation. The turbocharger uses the exhaust gas to drive a turbine. This spins an air compressor that pushes extra air (and oxygen) into the cylinders, allowing them to burn more fuel each second. But there is a physical contradiction here: The temperature of an air in intake manifold plenum chamber should be high due to providing more combustion cycles and higher load, AND should be low to reduce the risk of knock and operate with higher boost pressure for more power generation.

Here is one of the specific examples of how to nicely resolve this tough contradiction by water injection in twin-turbo engine --