05-31-2019, 05:46 PM | #45 | |
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BMWblog has F80 M3 at 34,677 units when it ended production. M4's were produced at higher rate and the introduction of the M2comp and M2CS. S55 production number will be well over 100,000 for sure. Last edited by DieGrüneHölle; 05-31-2019 at 06:02 PM.. |
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05-31-2019, 06:01 PM | #46 | |
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The bottom line is that S55 has a crank hub problem that is worse than the other engines sharing that design, for whatever reason. Maybe it's power, maybe it's something else, but S55 spins it stock occasionally while the others almost never do. No, this is not nearly as bad as the S65/S85 issue, so I am not trying to blow it out of proportion. It is a risk you need to accept if buying one. |
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05-31-2019, 06:03 PM | #47 | |
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enthusiasts would be here and reporting an issue, and more likely to own these cars in the firs place. I'm not trying to make a point - I guess.
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05-31-2019, 06:06 PM | #48 |
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Thanks! I was hoping someone would check my numbers!
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05-31-2019, 06:07 PM | #49 |
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We have to see how this plays out.
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05-31-2019, 06:11 PM | #50 |
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If it was a simple fix, there is no way BMW wouldn't have done it. Even for BMW this is ludicrous.
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05-31-2019, 06:20 PM | #51 |
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It is hard to find exact numbers, they seem to only be published when a model goes out of production.
F80 was 34,677 units. For comparison the E90 sold just under 10k and the E92 just over 40k. So a 4 to 1 ratio(sedan vs coupe). By the time the F82/F87 are out of production and same production rates hold true compared to E9x/F87N55. There could be upwards of 160,000+ S55 powered cars produced. |
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05-31-2019, 06:27 PM | #52 | |
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Who knows. Def think don't tune until you get one year of driving on the car to work out any early gremlins on the car through warranty. |
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05-31-2019, 06:39 PM | #53 |
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This is interesting.
The hub, washer and sprocket parts at the center of the S55 failure are literally used on every BMW. Could the bolt torque be the failure point? http://www.realoem.com/bmw/enUS/show...97#11237574827
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05-31-2019, 06:41 PM | #54 | |
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05-31-2019, 06:48 PM | #55 | |
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Edit: Don't forget that the S55 in the M2C is putting out the same torque as the S55 in the M3/M4. Last edited by AlpsRider; 05-31-2019 at 06:56 PM.. |
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05-31-2019, 06:52 PM | #56 | ||
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Also regarding the failures reported on N54/N55s... Yes, both N54 and N55 share the exact same crank hub. I have never seen or heard spun hub on a N55 but have seen/read multiple spun N54 cases (in fact Ghassan Automotive spun their N54 hub a few months ago on a drag strip). There are various theories floating around the internet; however, the general consensus sounds like this is more like a RPM issue than high HP issue. Vargas Turbo reported on a different forum that their N54 spun pushing only 300 something whp but the car was pushed near 8K RPM. Many people think sudden changes in engine RPM is the biggest contributor (e.g. kickdown on DCT cars). That being said, this is still such a rare issue compred to other chronic issues seen on S65 or S85 for instance. As mentioned above, there are well over 70K S55s produced so far and even though the forum isn't a perfect representation of the real pic, the failure rate is pretty low IMO. |
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05-31-2019, 06:56 PM | #57 | |
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You do realize that there are almost 0 documented stock N55 crank hub spins on the forum and they produced at least several hundred thousand more units of this engine, possibly millions. The sample size is massive in comparison. Every single 135, 235, 335, X3 35i, X5/X6 35i, 535, 740, etc... from 2009 until very recently |
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05-31-2019, 07:00 PM | #58 | ||
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05-31-2019, 07:13 PM | #59 |
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Another thing to mention is that almost all the spun hub cases end up with timing loss without any damage to the engine. Based on the crank hub failures threads in F80 forum, over 90% people ended up upgrading their hub to a keyed hub after the failure. I don't know about OP's case so don't wanna make assumptions but BMW might have taken the easier route in his case which is to just replace the engine instead of opening it and inspecting any valve damage etc. and re-timing it etc. Because I know from personal experience that even for simple transmission problems that can be fixed, BMW just gives you a brand new one instead of fixing the broken part.
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05-31-2019, 07:14 PM | #60 | |
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"The N55 has the same part. That means all of the M235i and OG M2s have the same potential issue. Many of the M3/M4s that had the problem we're modded. Many of them were DCTs with modded software ie. high power with a jerky tranny." Which is not what you claimed I said. |
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05-31-2019, 08:03 PM | #61 |
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05-31-2019, 08:09 PM | #62 |
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05-31-2019, 08:23 PM | #63 | |
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It's a long 28-page thread but has some useful info in it. |
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05-31-2019, 08:29 PM | #64 | |
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https://f80.bimmerpost.com/forums/sh...&postcount=175 https://f80.bimmerpost.com/forums/sh...&postcount=177 |
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06-01-2019, 12:15 AM | #66 |
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They don't. And even if they did, motors last a few races, 1 season tops before needing to be rebuilt or replaced.
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