The fuel-efficiency benefits from a higher power may also apply to your motorhome, it's all about how the engine is tuned. Injection timing, injector nozzles, camshaft, boost, there are many things that can be tricked to improve it for both power and fuel-efficiency.
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Originally Posted by guyd
how do other people with turbo-diesels with intercoolers fare with grille blocking? Surely blocking the air to the intercooler reduces efficiency, or does the rad get moved? My intercooler is directly in front of the main coolant rad, so one or t'other would have to be moved - I suspect the coolant would be easier / better to move as pipe length doesnt matter on water, but does on air.
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It's more reasonable to move the radiator. I'd only move an intercooler if it was top-mounted like in my grandpa's Toyota Hilux - a front-mounted intercooler is always more effective due to the better air flow and lesser effects of the hot air convection inside the engine bay. But that leads to another question: where to move the radiator?