The problem with turbo motors is that they are about impossible to police in any constructive way. Just look at the CamAm era, Jackie Stewart commented plenty of times about them only knowing that the Porsche 2 liter made over 1500hp because that is where the dyno stopped. lol
If they want to lower parts consumption and there fore costs by default, they need N/A motors with a compression limit and a max TB size. If they really wanna be mean they can put them back onto commercially available fuels instead of the wonder fuels that each team has specially formulated now.
While they are at it they can command materials for engine and diveline construction. The specialty unobtanium stuff they use now is insane. There is no reason for it, you can make a plenty strong aluminum and sleeve engine, no need for inconel oil passage inserts and metals I can't even pronounce to make pistons out of.
The rules just need to be made practical again. The FIA has gotten so hung up on having a cool image that they have forgotten that the racing is supposed to be about development and image for the manufacturers, not the sanctioning body.
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