Since 745i of the mid-80s, BMW has not produced any turbocharging petrol engines. Undeniably, its normally aspirated engines are among the best of the mass production world, especially the inline-6. However, as mentioned in my 3-Series report recently, BMW's 3-litre inline-6 has already ran out of space for enlargement, and it is now struggling to match its rivals' 3.5-litre or so V6s. To strike back, BMW is going to use turbocharging again. The first car to use the turbo engine is likely to be 335i. It will arrive in mid-2006. Its engine is based on the 3.0-litre R6 magnesium engine. An advanced twin-turbo system will boost power to approximately 330 horsepower. That's a good 72 hp more than 330i. The turbocharging system employs a small turbine for low rpm to ensure instant response and a large turbine for full boost. An advanced control ensures the transition from small to large turbine is seamless. A similar twin-turbo system made by BorgWarner has been used successfully in the 535d, now it finally make debut in a petrol engine.The 330hp 335i will bridge the gap between the 258hp 330i and the forthcoming 400hp M3. On the other hand, the 272hp diesel engine of 535d will also join the 3-Series. Turbocharging seems to have a bright future.Source: AutoZine.org
BMW 335i goes turbocharge
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E46Fanatic
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Last I checked from the engine lineup from germancarfans.com site, the new BMW turbo engine is not a lightweight megnesium alloy unit like the ones found in the new E90 valvy 6 potters. Its a much heavier and stronger cast iron block engine. Good for boost mods 
E34EuroTouring
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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.
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.
