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Originally Posted by Tesla
Have just started looking at this, starting to check pressures around the body.
I figured ram air should ease the load on the turbo and hence get some economy improvement as long as the setup does not introduce a new drag area, so I am thinking or drawing air from behind the front grille.
One question I was thinking of is that it will pressurize the inlet system slightly pree turbo, but this is also where the PCV dumps blowby gasses in from the crankcase, will this cause more blowby to be retained in the crankcase by pressurising it, is this an issue?
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Potentially the crankcase vent should be a small issue. The solution to that is quite simple--disconnect the crankcase vent tube from the compressor inlet. Prior to 2007 I know the 5.9L Dodge Cummins engines were configured that way. I believe many off-highway diesels are still that way.
As far as where to draw ther air from, I think it could be done in such a way as to actually help the aero if done correctly. I'm still looking into the best way to do this. One thought I had was to see if you could do it via cowl induction (pull it in right from the base of the windshield). Seems to me like that would slightly reduce the high pressure region that forms there and perhaps help the aero just a little. That being said, I think the effect would be quite small because the amount of air you draw into the engine vs. the amount of air your flowing past your vehicle would be quite small in most cases.