For a turbo, you hit it right on the nose. I'm not building a street racer. This is a small 4WD motorhome and I'm rarely going to run the engine above it's peak torque curve -which is around 2000 RPM. At that engine speed, it should have 375 lb. ft. of torque and 136 horse. That would require around 200 CFM. But, some needs to be added for dirt in filter, and those rare times when I stomp on the pedal to climb a steep hill, pass, etc.
A stock (no turbo) 6.2 run at 2000 RPM needs around 130 CFM. 6.2 (379 cubes) has a volumetric efficiency of 60%.
General rule of thumb that takes all into consideration (turbo or no turbo) is 1.5 times horsepower equals CFM need.
A stock (non turbo) 6.2 barely climbs above 120 horsepower - which comes to 180 CFM.
A 6.2 with a turbo, when driven in a "useful" RPM range, can make a max of 200 horse, thus needing around 300 CFM of air flow.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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