Originally Posted by Brian Carlton

This cannot be true. If you underboost the engine, you feed it less air and therefore it gets less fuel. It is putting out less horsepower and therefore will produce less heat. You could disconnect the boost line to the ALDA and run the engine without boost and it will run a hell of a lot cooler than it would otherwise run with boost.

If you give it more "throttle", nothing happens. If it is underboosted, no more air is fed to the engine and therefore no more fuel is fed to the engine.