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2026. 6. 30. 작업

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What is overboost?

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tl;dr: Overboost is too much air, usually at too high a temperature. Detonation is likely to follow. Remember, the engine is just an air pump . All the turbo is doing is making it easier for air molecules to get into the intake side of the engine. 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). The engine needs to add enough fuel molecules to combust with those air molecules. 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'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. 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): Lean is bad: If you have too little fuel for too much air, you have a lean condition