I see people arguing that they should use more throttle because it can reduce pumping losses, which I think really means that because so little air can get in, the engine is consuming energy in getting air/fuel into the engine. This is similar to the situation where you only have 2 valves per cylinder and the engine has to spend energy pushing out the exhaust. So when you have VTEC-E, it makes the exhaust stroke easier by having two valves open while at the same time restricting the intake valve.
So what is it, do we want to make air/fuel easier to come into the engine so that it doesn't strain to breathe, or do we want to restrict it so that it doesn't consume more fuel? With people saying that we need to use WOT or at least more throttle instead of starving the engine of air/fuel so it doesn't have to strain, why don't you guys install turbos or superchargers then?
Maybe what we should do is install a super/turbo charger while at the same time use a hot air intake, that way you have an easier time filling the cylinders while at the same time not filling it up with more fuel/air than usual.
Though I think my question/answer is starting to show my lack of knowledge in this field. This brings me the next question, why does the butterfly valve on a petrol engine regulate Engine speed and fuel consumption but not on a diesel? When you open the plate, you let more air in but how does that increase the engine speed? My reasoning is that opening the butterfly valve at 10% just means it takes longer for air to get in opposed to 100%.
I guess I'm just in over my head.
imzjustplayin 
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