12-04-2018, 12:52 AM | #23 |
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i did some googling and realised it is forged due to the wide parting line and smooth edges. it also made a harmonic singing noise when i tapped it vs a thud a cast crank would make.
this then means that a pwg m135i which looks identical also has a forged crank as i have seen one as well. what i dont understand is if the crank is forged and the rods are as well what makes the n54 internals stronger?
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12-04-2018, 02:55 AM | #24 | |
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I'm not sure if rods are forged. In n54 technical training from bmw ag they state that they are forged. in s55 or n55 documentation I haven't found that rods are forged.
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12-04-2018, 01:24 PM | #25 | |
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Do you have a pic of the differences as well? Would love to see.
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12-04-2018, 07:05 PM | #26 |
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12-04-2018, 09:00 PM | #27 |
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Guys, I made a list for you. See the attached picture. To the best of my knowledge.
Outside of the obvious EWG big turbo, keep in mind the following two points that is critical but is not often talked about. 1) Steel forged crankshaft is the key to M135/235/M2 making noticeably more power everything else being equal. 2) M2 manifold is why it easily holds up 16+psi at 6k+ rpm, with stock turbo and pump gas.
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Last edited by SeanWRT; 12-04-2018 at 09:40 PM.. |
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12-04-2018, 09:20 PM | #28 | |
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We really need to see the visual differences on the M2 manifold to understand. |
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12-04-2018, 09:25 PM | #29 | |
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And yes they're forged. Chart updated.
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12-05-2018, 02:02 AM | #30 |
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12-05-2018, 02:42 AM | #31 | |
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Didn't care too much as stock IC is the first thing to go once you power mod.
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12-05-2018, 07:08 AM | #32 | |
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it is the same part number.
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12-05-2018, 10:49 AM | #33 | ||
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12-05-2018, 01:38 PM | #35 |
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so its basically safe to assume the n55 can handle 400-450rwhp daily comfortably.
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12-05-2018, 07:07 PM | #36 |
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12-06-2018, 12:57 AM | #37 |
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strange that in B58 technical training it is mentioned that rods are drop forged, while not a word about it in n55 or s55 pdfs. But I agree, it would be nonsense to use non-forged rods in s55 and part numbers are the same with n55. Interesting thing that s55 holds higher power than n55 which tends to bend rods at lower power level than s55..
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12-06-2018, 04:08 AM | #38 |
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Do you have Pics /info on the difference between the two manifolds 335 vs M2 ?
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12-07-2018, 12:28 AM | #40 | |
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12-07-2018, 01:33 AM | #41 |
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PS2 is only capable of max max ~550hp, to make 600+ on n55, PS2 is not enough for sure, need to go speedtech, but not many people went that way and almost no info about blown engines..
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12-09-2018, 03:33 PM | #42 | |
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08-13-2022, 08:05 PM | #43 |
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not required, but recommended. the more power youre making the sooner your clutch disk will need to be swapped out, apparently the synchro’s start to get eaten alive with mods as well, the ZF 6 speed MT is a good trans but its not known to be very mod friendly
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08-13-2022, 08:16 PM | #44 | |
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