Quote:
Originally Posted by Diesel_Dave
What am I missing here?
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Doing so allows you to get 100% more power than you would get out of a naturally aspirated engine with the same displacement. From a mileage and efficiency perspective, it's very bad. As serialk11r stated, the excess fuel is used to cool the ignition chamber internally. Are there better ways of doing so? Yeah, probably. But this is the route most auto manufacturers have chosen for forced-induction engines.
But regardless, you are right. There is quite a bit of excess fuel that goes unburned. The cat is basically the only thing that prevents the car from shooting a fireball out the tailpipe.