The LMP regulations are much more varied than F1 and arguably more interesting.
Correct me if I'm wrong, but I think Audi are using a large capacity V6 turbo diesel, Porsche a small capacity V4 petrol engine, and Toyota using a 2.6 litre twin turbo V6. They employ differing energy recovery systems. Peak revs much lower than F1 - Audi, probably around 6k with petrol engined cars probably getting to 8k.
F1 engines are turbocharged 1.6 litre V6's capable of revving to 15k with multiple methods of energy recovery.
Whilst someone switching from one discipline to the other would have some experience to draw upon, fundamentally they are quite different and they would pretty much have to start from scratch with a clean sheet of paper.
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