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Ok here goes my stance for the R18
Spider open concept
4 wheel drive with 4 small electric motor/generators in each wheel hub, perhaps in the range of 20 HP each, not more...
A Litium ion battery pack that will allow to store the max amount of energy, in electric form as permitted by the rules
Main engine a 3.7 Liter V8 biturbo diesel with double head camshaft and 4 valves cylinder, with a HCCI mode of operation integrated with the electric mode of operation, for low to medium RPMs, permitting a "soberb" fuel economy in those modes, to overcame the restriction of a much smaller fuel tank...
Improved engine balance in its high RPM diesel mode, achieving close to 8 K RPM at max. Max power >=650HP, max torque ~900Nm
It would be a clever trick!... the rules have holes and blanks... but 2 of the electric hub motors can be made to run constantly from cruising to acceleration, perhaps the front wheel motors with power generated and delivered directly from the other 2 wheel hub motors acting as generators on the rear axle, by-passing that way the batteries.
Upon braking all wheel hub motor/generators will generate electricity to be store in the batteries.
Upon medium to heavy acceleration all motor/generators will motor the wheels for an additional max power of 80HP and an additional max torque of ~180Nm.
hints: VW had a concept with wheel hub motor/generators... 4 wheel drive is almost a trademark of Audi, and would permit to take better advantage of the additional torque of the electric motors
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