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      10-05-2020, 02:47 PM   #28
fastboatster
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Drives: 2009 bmw 328i
Join Date: May 2019
Location: CA

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Not a fan of dcts either. Great concept in theory, not so much in practice. Zf 8hp is hardly heavier and larger than comparable dcts. 8hp70 is hardly heavier than GS7D36SG while having larger official torque rating and probably having more in reserve. I don’t think that weight/size argument is valid simply because using planetary gear sets and a few clutches arranged around it in a radial fashion takes up a lot less space than having several large gears on 2 separate shafts. Larger gears also means more weight. Why wouldn’t we also call pre2017 Honda transmissions “enthusiast” if they are also using the same gearsets as manual transmissions to derive the gear ratios? Anyway, zf 8 is almost as fast shifting as many dcts, a lot more reliable, very light for what it is, has been continuously refined by multiple OEMs and has a huge knowledge base unlike many dcts which are often brand specific. There’s almost no performance penalty in any scenario and it has some killer features like direct shifts from 8 to 2nd or shifting up and down by disengaging and engaging one clutch only. If DCT preselected one gear but you actually need to get another then that shift will take a long time resulting in less than responsive behavior
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