BjoernB:
we spoke with Walliser once about Tiretechnologies etc and how fast they were evolving - if a new Tire would be made for the 918 I am sure it would further improve a lot. I dunno if you can just slap a Michelin R tire on it or if you could do much more if they would customize it again. I do not know what the latest is here but would be interesting from Whoopsy to understand what Porsche suggests to owners.
Nein. Nadda. Zip. Nothing. 
The original OEM Cup 2 N0 was pure black magic. It was an ECO rated tire yet it didn't give up any, if at all, lateral grip. Nor longitudinal grip, seeing how hard it can launch a 4000lb pig from 0-60 in record time. The tire construction was completely customized for the 918.
The Cup 2 N1, then the Cup 2 N2, have stickier compound, but honestly, not by much, if a 918 were to run on those the improvement would be fractional, if at all, as the side wall of those aren't tune to the 918. The N1 tires were tailored for the 991.1 GT3RS and the N2 for the .2. Cup R has the stickiest rubber compound on the surface, the first layer, but the constructions was again not tailored to the 918, it was for 911s. For acceleration purposes, it would surely helped however. As for as I can tell, no 918 owners have ever slapped a set of Cup Rs to theirs yet. Pretty sure Porsche did ran their factory car at Weissach with the Rs and already have data. Think it may not be satisfactory to them, hence no official certification from them for usage. Heck, they never certified the N1 or N2 for the 918 owners. Officially, we are still stuck with the ECO rated N0 tires.
Don't really mind that, a 4000lb car running on ECO rated tires kept the 0-60 crowd fro 7+ years.
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That Demon with the sticky tires is a beast
