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Originally Posted by dellguyz
Thanks so much Mr. Curtis73, I still got one silly question according to this turbo concept:
"If you push the acclerator more (open the throttles more) you are letting in a lot more air even though the RPMs might not go up. More air in means more exhaust out."
In my imagination, only RPM goes up (engine run faster) can figure out the increase of exhaust gas. But really can't figure out how the situtaion of "Engine suck and exhaust more gas but keep its running speed"? It sucks more fresh air, consume more fuel, exhaust more gas, should have more energy come out. But now it doesn't , it just stay the same speed. why?
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For an engine, air in through the throttle has to come out the exhaust.
At part throttle you're restricting the air in, which restricts the amount of exhaust out.
When you open the throttle (at any rpm) the amount of air into the engine greatly increases, this produces more exhaust which drives the turbo to produce even more intake air (boost).
Increasing rpm also increases the airflow (if you're comparing similar throttle position).