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      01-24-2010, 04:07 PM   #14
stressdoc
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Dominica
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Drives: F80 YMB
Join Date: Jun 2005
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You guys are right of course -- the turbo in the N55 is not a sequential design, nor an active variable geometry design. I should always double check myself whenever I use the word "impeller" because I use it inappropriately to refer to the turbine fan. My point is simply that the turbine fans in the N55 are designed for low threshold, reduced lag, and high power. I don't understand the nuances of how the blades are designed differently to take advantage of the separated manifold.

Pretty good summary here:
http://kilometermagazine.com/artman2...Turbo_Six.html

But I want to see a better cutaway than what BMW provided in the Press package.

Any advantages to a manifold/header divided 6 ways, with separate inputs from each cylinder to the turbo? Complicated mess.