As we discussed, turbochargers are a feedback loop, and there’s a lag between when you press the pedal and when the turbocharger starts to kick in.Let’s say you’re cruising along at high RPM and your turbocharger is producing maximum compression. Intake pressure is upwards of 12psi. The engine is pulling hard and life is good.You start to take a corner, so you let off the gas. The engine is now injecting very small amounts of fuel into each cylinder (because you lifted the throttle). However, the air inside the engine’s intake manifold is still pressurized.This pressurized air forces its way into each cylinder, where there’s very little fuel, and you suddenly have an engine that’s running dangerously “lean” (too much air for not enough fuel). A lean engine gets very hot very quickly, and this heat causes damage.Get rid of the compressed air whenever the throttle is lifted. Most automakers “get rid” of the compressed air that’s not needed using a wastegate. A wastegate releases excess pressure in the engine’s intake manifold whenever the throttle is lifted. This way, the air in the intake doesn’t try to forcing its TD03L4-10TK3 Turbocharger 11657649289 way into the engine and causing a lean running condition.