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I'm betting that the Toyota engine isn't a relative light weight because of it being both forced induction and twin turbo. Also, combined with going with batteries, the TS050 is over the 875kg limit, while Audi isn't. How is that explained.
It's also been shown that bigger engines that rev slowly are just as if not more efficient than smaller, higher revving engines.
The problem with diesel engines is that because they're compression ignition, they have to be stronger (and hence, likely heavier) to handle the extra compression. Also, the increased displacement is a view to overcome the biggest single deficit that a performance diesel has--that diesels can't rev. While Toyota and Porsche can pull 8000rpm, Audi are stuck to about 4500rpm due to the nature of diesel engines not being capable of running at very high rpm.
Diesels aren't known for making huge top end power, even with forced induction.
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