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Not digging the tri-turbo concept...
If they wanted the staggered boost concept, wouldn't it have been easier to use a twin-scroll set up for the bottom 4 cylinders and a larger higher boost traditional turbo that kicks in about 3500 rpm and takes u to 7500-8000 rpm?
too many concerns here - overheating, robbing power off the crank, added weight, 3 intercoolers, another hpfp; very concerned about reliability, not to mention this is less efficient
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2014 335i RWD: ZMM, ZDA, ZDH, ZPP, ZTP, 2NH, 2TB, 5DL; Z4A MPPK; AW ext / VB int
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