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From 2017 there were a lot of reliable rumors about an unballested oreca07 being in the range of >700kg -<800kg. I think gibson lmp1 engine is heavier than the lmp2 version, so it should let R13 have a heavier dry weight making the ballast placement a critical aspect to get a likely 44/56 at a so lightweighted bop target of 833kg, while oreca07 having to reach 930kg has an easier approach about ballast since it must to carry much more.
Don't know about dallara tub, but at example I remember that max angelelli in a 2017 interview said that cadilacc dpi was about 50kg overweighted because of the huge 6.2L, scott sharp said something similiar also about the nissan powered onroak dpi, allowing me to guess that in unballasted conditions oreca07 is much lighter than competitors. Not a big surprise actually
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