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Originally Posted by JAG
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.
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Are these turbo engines or NA units? the 34mm restrictor was imposed on forced induction engines I beleive. The link between revs and power is broken as you have a third variable--boost pressure.