Quote:
Originally Posted by SmartTrucker
About the underhood air filters though it just doesn't seem optimum. When the trucks are in the yard I'll try to get a photo or two of what I'm talking about. They seem to be in a location that would most likely pull in hot air which can't help our power situation out any (this is on the columbia models)
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I don't know if this carries over to diesels at all, but in my Insight I get better fuel economy with warm intake air - 100-130F, as opposed to whatever comes in from the outside. I think it allows the ECU to run a leaner mixture.
Of course economy is not the same as power - on long flat stretches the Insight doesn't need much power to maintain speed, and I suppose with the trucks it'd depend on how it's geared. So maybe a flapper valve to pull in cold outside air when power is needed (like on hills), or warm air when cruising on the flat.