That's not necessarily so much a shape thing as it is material. Because LMP2 cars are cost capped and have a much higher weight limit it doesn't make much sense to invest in certain weight reducing measures.
http://sportscar365.com/lemans/wec/c...-new-lmp2-car/
Quote:
“The BR01 is the first real new LMP2 car,” Catone said. “From the beginning, the project was focused on LMP2. Today we’re at 900 kg. We can’t go to LMP1-L with the same car as that should be 800 kg.
“We could redo the monocoque with zylon to save 20 or 30 kg but this is an investment in itself. I asked the customer at the beginning of the project. If we had to do both, it would be very expensive and not necessarily optimized for the other.
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