Yeah the ACO regs regarding diesels said there must be no visible emissions. This was fine with the R10, but come 2008 Peugeot had turned up the fuel mixture and it was very clearly visible from trackside. Stood trackside at the esses looking up at the Dunlop bridge and you could see it against the sky in the morning. Since the ACO were then ignoring it (rule obviously didn't apply to the French cars), Audi had to respond and come the R15 they had visible fumes too, and the ACO decided to not bother with that rule.
Where did the Toyota graph come from? It's a very odd one. Doesn't seem to fit with the scales and since its LMP based you'd expect a bit of data on the Audi diesels, but they've highlighted toad cars. Its a bit strange that one.
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