Quote:
Originally Posted by pgfpro
but this makes a higher pumping loss.
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I generally disagree with intake pumping loss statements. Things like lean AFR, EGR, pulse and gliding, higher gearing and different cam profiles can reduce pumping losses. But an engine cruising at a steady speed needing x amount of fuel and therefore air cannot have greater or worse pumping losses from the type and size of the intake. If the intake really does have greater pumping losses then less air and fuel enter the engine, the engine produces less power and the end result is that the car slows down or can't maintain the target speed.