Take this article on their MkVI Golf TDI build. Not only is it informative and well composed ,but it also shows just how regulated modern Diesels are. Seriously, there are 70's catalytic converter/Smog levels of power loss going on here.
Anyway, I've been on Moto IQ a couple times before, but now I've realized just how valuable a source it is for technical information. It also helps that unlike sites like CDX online, it's more geared towards proper gearheads that might do a proper build rather then some college engineer.