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With yearly development factory diesels were gaining a couple of seconds per lap at lap Le Mans even with smaller restrictors/boost, wings and more weight.
In the Acura's case a 50-80bhp power increase will have a big effect on Le Mans' straights while updated aero and large P1 tyres should improve cornering and braking ability.
With regards to running under 3.30 last year diesels gained so much time on the straights compared to their petrol rivals, in race conditions it must have been easier to put in quick laps than will be the case for 2011 cars who will be looking to gain time in the twisty bits and under braking.
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