Too much energy is bad: It's possible to have too much energy in the system even when things are going "perfectly." Imagine a theoretical system where your turbo is 100% efficient (adds no heat during compression), your fueling system can pump in arbitrary amounts of fuel and your engine computer can keep up with all the demands.
Terminal detonation is exactly what it sounds like: critical pieces of the engine itself explode away. This cause all kinds of bad mechanical problems, sounds awful, can break your engine and definitely doesn't make you feel speedy.
The consequence is that the mixture in the cylinder ignites at the wrong time. Heat is theĬause of detonation, which is the nemesis of high performance.
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Quoting Corky Bell of Maximum Boost fame:Īny misfires at full throttle induced by a lean condition are seriousĪnd must be dealt with prior to operating at that boost level again.Ī lack of fuel raises chamber temperatures dramatically. In fact, it can sometimes suddenly ignite due to hot spots in the cylinder or just the fact that the whole mixture is above its activation energy. In this situation, the fuel-air mixture is actually easier to ignite with increasing temperatures (e.g., under boost). Lean is bad: If you have too little fuel for too much air, you have a lean condition. Too much boost (overboost) can lead to two big problems (well, lots of possible problems but let's stay at a fundamental level for now): The engine's goal is to make sure that there's just the right air-fuel mixture at just the right temperature to ignite exactly when it's supposed to. Because of the increase in air temperature, it sometimes needs to add even more fuel as a coolant (which seems wasteful because it is). The engine needs to add enough fuel molecules to combust with those air molecules.
Of course, the turbo has finite efficiency: it is pushing in more air molecules but it's also increasing their net energy (i.e., intake air temperature goes up). All the turbo is doing is making it easier for air molecules to get into the intake side of the engine. Remember, the engine is just an air pump. Tl dr: Overboost is too much air, usually at too high a temperature.
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