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VTGs have virtually no turbo lag, which is why diesel engines use them, and why Audi have them on the R15 (to test the concept) and the R18 (proving the concept). They might have some lag at like idling speed and rapidly going wide open throttle at that speed, but at racing speeds, the engine response should be better than the 908, which has conventional TR30 turbos.
The reason why the R18 smokes on accelleration is because, perhaps in part, because of two engine banks and one particle filter, and definenlty because of running rich to make almost max power, just as the 908s were at the test--videos do show the Pugs smoking noticeably under similar conditions.
And you can bet that as long as the Pugs smoke and that Audi backs up the ACO's racing agenda, that ACO probably won't do much of anything, as the smoky Audi R18s and Pugs will likely pollute less than many production cars, and certianly less than some gasoline engined LMPs (namely the AMR-One!).
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