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Originally Posted by phoenix
All other things about the engine remaining equal, the engine will have to rev 22% faster to generate 695 bhp than it was spinning to generate 570 bhp. Fuel consumption would increase by the same amount.
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570bhp appears incredibly conservative, the absolute minimum quoted is always 600bhp, and as stated above, I would think they're closer to 620bhp.
I don't recall the V12 LMR reving much higher than the Aston V12, despite producing over 650bhp with the same displacment.
WRC and rallycross engines are very similar, but the 34mm restrictor on a WRC car produces 350bhp, the rallycross car more like 550bhp wih a 38mm-40mm restrictor.
I don't believe a rallycross cars revs anymore than 1500rpm higher than the wrc machine, if that.