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Alex (UK) said:
Interesting thanks Grant


No problem. Also, it should be noted that getting more power out of a motor like a GT3 is not as simple as raising the electronic rev limit.

Revs create alot of stress in a motor. I believe that the forces created are related to the moving mass times the square of the speed of its parts (a motor that revs twice as high will have 4 times the stress, assuming everything else is equal). So, the engineers need to make large strides in reducing the mass of the moving parts to accommodate the higher piston speeds without causing additional stress (and shorter engine life).

So, if you want to raise engine speed 40%, you need to cut the moving mass in half to keep the same forces on the bearings, rods, etc...(square root of 2 is about 1.4)