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Message: <blockquote data-quote="E34EuroTouring" data-source="post: 59888" data-attributes="member: 1026">Turbo engines will need to be strong. Using cast iron does make sense as it is strong and cheap to make. I am not sure of the magnesium block is strong. But then factory turbos tend to run low boost like 6-7 psi just like Audi (A4T) and Volvos (T &T5). I would be very surprised if the magnesium block cannot take the little strain of about 20%!.Maybe those NA blocks are very highly optimised already like the M cars.  To me the material switch seems to indicate a version change in design. I am sure there are kinks to work out. Putting a turbo is the best way to stress test it.One can see the Jap turbos like EVO, WRX can take very high boost up 21 psi or so. Man, no wonder the Evo can kick over 300HP for a 2 litre powerplant. Just awesome engineering. I would want to see a simpler Supercharged design using a magnetic clutch pulley much like your aircond pulley now. This way SC stays out of the way and kicks in only when needed. Should make it last as long as the engine. Thats the challenge. Good SC compressors like Rotrex are as small as our alternators now.</blockquote>