Good illustration, rwaffle. In fact, I'm pretty sure I'd read that tidbit (about the potential for diesels to benefit more from aero mods) and saw similar maps posted at TDIclub.
But I don't know turbos at all. What's the effect of taller gearing on turbo operation? If dremd's goal is to stay out of the boost, wouldn't reducing RPM through a gearing change raise engine load and cause the boost to come on sooner for a given road speed?
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