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let's clear something: oreca 07, along liger and dallara lmp2 with gibson engine under the hood are lighter than 930kg. No doubts about that. Add to this mandatory air conditioning system and you just have some room left for ballast to reach 930kg.
Turbo engines are heavier, require extra cooling devices around it and a more resistant rear subframe structure joint to the monocoque; very likely acura dpi uses a different rear suspensions geometry than standard 07, to make the powertrain fully stressed. The latter is just a my theory of course, but quite realistic I guess. All these modifies make the car much heavier.
Question: Is oreca 07 chassis so light that even if powered by HPD 3.5 V6, the car will remain under 930kg? Perhaps, or maybe not.
About lmp2/DPi, is not so correct. Power gap between lmp2 and dp was in the range of 60hp in 2014 (nissan 500hp lmp2 vs GM/ford about 560hp). From that, dp power was constantly nerfed, until 2016 season where ligiers powered by HPD 3.5L were basically in the same power range power, if not something more.
Real deal for dp was that both riley ford and corvette DP were in 600-640Nm range, 100Nm more than lmp2 nissan, that helped the dp's to be on the edge even if heavier and less aero/chassis developed.
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