Quote:
Originally Posted by Akrapovic
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.
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Yes, I do think the Audis were cleaner early on. The Peugeot entry did seem to affect the rules and things weren't as clear as before.
When everyone was talking about equalizing diesel and petrol, with a petrol engine you can restrict the air on the front end, with a diesel, you have particulate filters that restrict the engine on exhaust.
Later on, it seemed the particulate filters weren't focused on as they were earlier.