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12-06-2014, 09:28 AM | #23 | |
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12-06-2014, 11:11 AM | #24 |
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They both use the same pump. There have been several revisions. The latest pump along with a software update to prime the system before attempting to start the motor seems to have made the problem "go away". This solution was brought about right around the time the n55 hit the street so it has benefited from it as well. There are usually symptoms like long cranks before they fail although not always.
N54 pump: http://www.realoem.com/bmw/showparts...83&hg=13&fg=15 N55 pump: http://www.realoem.com/bmw/showparts...55&hg=13&fg=15 Wastegate actuator arms and pivots were revised for later n54 motors and I believe they are thicker and less prone to warping and wearing out. I don't think they are rattle proof though. Realoem doesn't show the old turbo part numbers but does show that the lock rings for the arm went from 6mm to 8mm. Overall the N54 didn't get replaced because of issues it got replaced because a revised motor was created in the N55. N55 is a newer design it is designed to be more fuel efficient and cheaper to manufacture. There is nothing inherently wrong with either motor. |
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12-06-2014, 02:42 PM | #25 | ||
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12-06-2014, 06:02 PM | #27 | |
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DCT in Sport-Auto mode, will downshift and engine brake if you brake hard on the brakes. Typical scenario from my commute home: 70 MPH on highway, exit ramp comes, hit brakes relatively hard, DCT auto downshifts to 3rd gear, holds 3rd the whole way through the off ramp even while I accelerate. This is my first non-MT car and I love the DCT. Superior to MT in everyway. |
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12-06-2014, 07:29 PM | #28 |
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Sounds pretty nice (seriously). But just this evening I'm driving my 90yo dad out for Thai and listening to me shift (windows open), and I'm sorry, but that's music. I love my new (to me) car, this thing is amazing.
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12-07-2014, 04:23 AM | #29 | |
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There is nothing wrong with tuning the n55, just not a lot of options if your 2012+.
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12-07-2014, 07:53 AM | #30 | |
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When I said superior, I meant on a objective basis on the actual mechanics of shifting gears machine vs human. DCT shifts faster, can hold the exact gear you want etc. There is a reason F1 hasn't had MT for a long time. Doesn't mean you'll like it necessarily. |
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12-07-2014, 10:32 AM | #31 | |
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That being said there's nothing like a perfect heal/toe downshift with a manual.
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12-08-2014, 04:11 AM | #32 |
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Everyone has their own preferences! I like the control with the 6MT, heel toe, rev matching, etc.
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