Personally, I don't care if a 4wd is used as a 2wd so long as the whole front drivetrain is not powered, i.e. there's no powered rotating mass at the front of the car.
So it would be interesting to know if those folks who ran their 4wd's as 2wd at Stotfold only removed the front driveshafts or whether they disabled the whole front drivetrain. If they are finding that a powered rotating mass at the front of the car aids performance then that is where I would have concerns.
My thought is this: if 2wd cars are allowed to have a powered rotating mass at the front then where does this end? Do we really want the next generation of 2wd buggies to have powered rotating masses at the front? Do we really want to go out and buy collections of different weight 'front gyros'?
IMO, the parts that the motor powers should only be those directly concerned with the powered wheels themselves, but how you word that rule in a rulebook would require some thought, but I am sure they have achieved it in full-scale 2wd racing cars!
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