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Message: <blockquote data-quote="ALBundy" data-source="post: 592523" data-attributes="member: 15">Actually the N54 has similar size twin turbos. N55 single turbo but twin scroll. Twin scroll means twin intake pipes separately chanelling exhaust gases (one for cylinder 1,2,3 and the other for 4,5 and 6) onto the exhaust turbine fan which is connected to the inlet fan that compresses incoming air. By virtue of separating the exhaust gases travelling at high speed into 2 separate channels, this minimises turbulence (due to engine's firing order, if I remember correctly for inline siz engine its 1-5,2-6,3-4) and create a smoother flow which translates to lesser/minimal turbo lag. Yeah, this is the fault of the marketing people inventing fancy acronyms <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" /> If I may confuse everyone further, in BMW world Twin Power Turbo could mean 3 things, namely:-1) Twin Turbo Units (as in the N54 engine with same size turbine)2) Twin Turbo Units (one small and one larger turbine, as in the 525d)3) Single Turbo with Twin Scroll (320d, 328i, 335i and etc etc)Test drove the F10 525d in a far away race track recently, all I can say is  :rock: . This engine needs Euro 4 diesel.<img src="http://i2.photobucket.com/albums/y35/albundyXX/madras.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />Cheers</blockquote>

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