11-08-2019, 04:46 PM | #111 |
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11-08-2019, 05:33 PM | #112 |
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I heard the crank bolt comes loose over time as a result of the dct kick down, essentially the shock wasn't enough to spin the hub but it was enough to loosen the bolt. In other words it wasn't BMWs fault from the factory but I guess luck does have to do with if it spins loosens or not. Atleast a CBC is really cheap, I believe sub $100, and the install is really easy as well.
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11-09-2019, 02:31 AM | #113 | |
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https://www.ecstuning.com/b-vargas-t...t-s55-cbc~vtt/ Did you do that your m2c ? |
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11-09-2019, 03:11 AM | #114 | |
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But like I said before if you're under warranty I would bother with this until the warranty is nearly over.
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11-09-2019, 04:08 AM | #115 | |
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If you are going to get rid of the car before warranty runs out and not modding I agree don't waste the time.
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11-09-2019, 06:36 AM | #116 | |
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11-09-2019, 11:08 AM | #117 |
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CBC is not a 100% solution as friction discs can still fail and cause a hub spin. However, the fact that there is not a single failure reported with CBC installed might be indicative of bolt becoming lose being a common reason for SCH in my opinion. The chance of SCH happening is very low already when you look at all the reported cases vs number of S55 cars produced so far. I think CBC lowers this risk even more and costs a fraction of what a keyed hub would. Therefore, I thought CBC was a nice safety net (even though being not 100% fail proof as mentioned earlier) and decided to go with it. I have been running it since I hit 5K miles. I currently have nearly 11k miles and 9 track days. I have been on BM3 CS+ map since I got the CBC installed and so far so good. I'm not planning to do a keyed hub anytime soon either. If you look at all the SCH cases, almost all of them resulted with just a timing loss (only seen one case of piston hitting the valves and it might be a money shift). I'm aware of the fact that forums in general aren't a 100% representation of the real statistics but I still think SCH is such a rare occurrence. Btw some of those 6MT SCH cases reported online are due to money shift but obviously owners rarely come forward and admit it for various reasons.
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11-09-2019, 02:57 PM | #118 | |||
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I guess it's up to the end user what they do but for me if the bolt slipped and BMW saw that CBC they would probably have reasonable grounds to deny warranty. Quote:
2) if it isn't happening frequently enough it is cheaper to fix motors as they go vs. perform a recall. Just like on the sti with ring land failure. 3) the CBC isn't a complete fix, the friction disc can still spin. Quote:
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11-09-2019, 03:31 PM | #119 | |
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Someone here experienced engine/tranny replacement on M2C DCT while cruising due to SCH. |
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11-09-2019, 04:42 PM | #120 | ||
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11-09-2019, 04:50 PM | #121 | ||
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If it slips too aggressively and the pistons hits the head worst case scenario you'll need a new motor, best case scenario just a new valve. Quote:
You can also get a kick down blocker to stop kick downs as well to help alleviate the possibility of spinning the hub.
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11-09-2019, 06:42 PM | #122 | |
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11-09-2019, 07:21 PM | #123 | ||
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11-09-2019, 07:29 PM | #124 | |
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I'd love to have hard figures on the overall % of S55s affected. |
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11-10-2019, 01:15 AM | #125 | |
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The reason BMW doesn't recall it is the same reason that BMW didn't recall the S65 or S85 - the majority of the failures happen out of warranty. Sad to say, they don't really care, they go with whatever their actuaries think is the lowest risk to the business. |
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11-10-2019, 04:33 AM | #126 | |
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Have there been many SCH cases out of warranty that you know of or does it happen early if at all? |
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11-11-2019, 10:32 AM | #129 |
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It's totally random on both tuned and stock engines.
Considering BMW pushes 405hp - 454hp from the S55 Stock.
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11-11-2019, 11:54 AM | #130 |
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That's just it, if it were tuned cars only or those using kick down then I would feel a little bit easier but it seems to also happen out of the blue for stock cars.
Not the track record desired if you're planning on holding on long term... |
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11-15-2019, 03:01 AM | #131 |
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11-15-2019, 08:19 AM | #132 | |
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IMHO this is an issue that is blown out of proportion by forums where we hear all the bad but rarely the good of any car. Also what performance engine does not have some sort of robustness issue or other weakness?
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