dren wrote: ....... And 90kw MGUH, that's a lot more than the 7% or so that was estimated earlier. 20% gains would have the normal engine output around 720hp without ERS. Are turbos that much more efficient, requiring far less power now?
FWIW I suggested a few months ago that MGUH power would be 100 kW for most of the WOT time
this view was based on the work done by the NACA in the mid 1940s (following Buchi)
showing that about 8-10% 'free' power was recoverable from the exhaust (ie without loss of crankshaft power)
and that much more power was recoverable with a corresponding loss of crankshaft power, importantly giving improved efficiency
(this of course was for sea-level conditions, not of major importance at that time)
in a fuel-limited formula an engine design matched to this higher efficiency would be a winner in combined ICE/EM power
this work was based on axial turbines of 70-85% efficiency but not necessarily higher power than 2014 F1
presumably radial-flow turbines can manage around 70% efficiency today
IIRC turbo supercharging power in 2014 will be about 45 hp