Cold engine revving. A cold engine is highly susceptible to wear and tear. It does not matter if the engine is naturally aspirated or turbocharged, a cold engine should not be revved hard. In turbocharged engines, the damage can be much more. The engine oil lubricates the engine and keeps it safe from any wear and tear.
The two methods of forced induction differ in how they are powered. A supercharger is driven from the engine's crankshaft and consumes power. A turbocharger, on the other hand, uses the exhaust gas exiting the cylinder to operate, and it requires no power from the engine. The turbocharger accomplishes two things.
hAmu.