Quote:
Originally Posted by cRiPpLe_rOoStEr
I've never seen any case of an intercooler decreasing fuel-efficiency in a turbodiesel.
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Same here.
Diesels typically like cooler intake temps for efficiency (within reasonable ranges). Cooler temps help because higher intake air density means a higher air-fuel ratio. Thermodynamically, the cooler temps also help the specific heat rato. Basically the same reasons I put a cold air intake on my diesel.
Granted, at low boost levels there's not much to cool--so it shouldn't affect you much at low power levels and at low ambient temps.